ARTIFICIAL HEART VALVE

专利摘要:
artificial heart valve, and attachment ring. an artificial heart valve is disclosed which comprises a support structure defining an opening for blood flow and a flexible leaflet connected to the support structure along the first and second attachment lines at least partially straight, in which the leaflet is mobile in relation to the support structure between an open configuration, in which the leaflet allows blood flow through the opening, and a closed configuration, in which the leaflet restricts blood flow through the opening. a lateral cross section made through the leaflet defines an outward convex portion, an outward concave portion and a junction between the convex and concave portions. the heart valve can be configured for implantation in a human or animal individual. a method of making a heart valve and a trainer for use in such a method are also disclosed.
公开号:BR112013020872B1
申请号:R112013020872-4
申请日:2012-02-17
公开日:2020-09-29
发明作者:David J. Wheatley
申请人:The David J. Wheatley Discretionary Trust；
IPC主号:

专利说明:

FIELD OF THE INVENTION
[001] The present invention relates to an artificial heart valve and a method of making an artificial heart valve like this. BACKGROUND OF THE INVENTION
[002] Heart valves can be abnormal from birth, can become sick, or can degenerate in old age. When their function is sufficiently impaired, they may need to be replaced. There are many different artificial heart valves for replacement in established clinical use. In general, these artificial valves have been of two types. Mechanical replacement heart valves are constructed of rigid synthetic materials such as metal alloys, pyrolytic carbon, or rigid polymers. They don't look like natural heart valves. Biological replacement heart valves are constructed of flexible materials of human or animal origin such as human aortic or pulmonary valves, animal aortic or venous valves, or animal pericardium (the fibrous leaf that surrounds the heart). Such animal tissues are usually treated with agents such as glutaraldehyde to increase their durability. Biological heart valves look like natural aortic or pulmonary valves. Bovine pericardium treated with glutaraldehyde is a commonly used material, modeled on three flexible leaflets in a support frame to mimic the natural aortic valve. These valves are implanted in the heart after removal of the abnormal valve through an open heart operation. More recently, flexible valve leaflets have been attached within an expandable mesh-type cylinder for implantation through a catheter inserted at the apex of the heart or through a peripheral blood vessel. After manipulation to the correct location, the device is expanded with a balloon to create a functional valve, without the need for conventional invasive surgery.
[003] In general, mechanical valves require long-term anticoagulant drug treatment to prevent blood from clotting around the valve and interfering with valve function, or from spreading into the bloodstream to the point where it clogs vital arteries to the brain, intestine, limbs or other areas, while biological valves are vulnerable to degeneration that limits their useful life, particularly in children and young adults.
[004] Attempts to use a synthetic material to replace the biological material in valve leaflets have been stimulated by the desire to prevent calcification and degeneration of the leaflet, particularly in young adults and children, which impairs the clinical attractiveness of bioprosthetic valves. Most efforts have focused on bio-stable polyurethanes. The design of the valve has been similar to that of bioprosthetic valves in the expectation of retaining the low thromboembolic risk of these valves.
[005] Artificial cardiac valves of flexible polymeric synthetic leaflet, still in an experimental stage, cannot be considered with an established pattern of standard design. However, those examples that have been revealed in the literature mimic the design of the standard established bioprosthetic valve, which in turn looks like the natural aortic heart valve. There is a good reason for this, as the design retains the almost natural blood flow through the functional valve. This is believed to be responsible for the bioprosthetic valve being unlikely to activate the body's blood clotting mechanisms (“low thromboembolic risk” - consequently allowing the use of these valves without the clinical need for anticoagulation), unlike the “no "abnormal flow patterns of mechanical valves.
[006] The use of synthetic polymers, such as polyurethane, has been proposed as a possible solution to the limited durability of current flexible leaflet bioprosthetic heart valves of animal origin. There are some examples of synthetic polymer heart valves in clinical use and these are currently limited to use in extracorporeal circuits where prolonged operation is not required. Experimental polymer heart valves have shown limited durability, and this is a serious disincentive for further development of such valves for clinical use as valve replacement devices. Experimental polymer heart valves have, in particular, been susceptible to damage such as tearing, due to high localized bending stresses, especially caused by warping or wrinkling that can occur during valve operation.
[007] The available polyurethanes that are suitable for medical use and that are sufficiently bio-stable for prolonged use in the bloodstream are relatively limited in number and are generally too rigid to allow satisfactory functioning of leaflets made of polyurethanes. This is particularly apparent with the more rigid polyurethanes of greater modulus that would have maximum durability and bio-stability. In addition, the use of reinforcement within the polyurethane, such as carbon nanotubes or larger fibers, is likely to increase stiffness and make the reinforced leaflet too rigid for satisfactory hemodynamic function, that is, too rigid to allow the valve to open and close promptly with satisfactory pressure drop across the valve and low regurgitation through the valve.
[008] An important group of patients currently do not have a satisfactory practical replacement heart valve available to them. This group comprises children and young adults in developing nations. For example, Sub-Saharan Africa has the largest population of patients with rheumatic heart disease in the world (World Health Organization (WHO) estimated at over one million people aged 5-24 years - compared to around 33,000 in the industrialized world ). Many of these are worthy of valve replacement. For these young patients, complex valve repair or valve transfer procedures (Ross operation), sometimes applicable in the developed world, are not a viable prospect; mechanical valves need long-life anticoagulant therapy (requiring supervision by itself), with a prohibitive long-life risk of bleeding or thrombosis of the valve; and biological valves often last only a few years before needing to repeat the surgery, with their own resulting risks. Thus, for the relatively small number of younger patients in the industrialized world, and for patients who cannot take anticoagulant drugs for medical or lifestyle reasons, there is an urgent need for a durable replacement heart valve that works in a clinically satisfactory way without anticoagulant drugs for many years without being vulnerable to deterioration and early failure. However, there is a much larger patient population in the developing world that could benefit from a valve like this. Access to surgical facilities has often been a limiting factor, but with increasing development in many countries, this may well not be a problem. If a reliable, reasonably priced heart valve that did not require anticoagulation, and that was easy to deploy in a conventional operating environment, was available, there would be a wide clinical application. SUMMARY OF THE INVENTION
[009] In accordance with a first aspect of the present invention, an artificial heart valve is provided comprising a support structure defining an opening for blood flow and a flexible leaflet connected to the support structure along first and second lines at least partially attachment lines, in which the leaflet is mobile in relation to the support structure between an open configuration, in which the leaflet allows blood flow through the opening, and a closed configuration, in which the leaflet restricts blood flow through the opening, and wherein the opening defines an axis and a lateral cross section made through the leaflet in a plane lateral to the axis defines a convex portion outward, a concave portion outward and a junction between the convex and concave portions.
[0010] In use, a valve like this can be implanted in a human or animal in such a way that the leaflet extends along a direction of blood flow and the lateral cross section through the leaflet is aligned in order to stay in general lateral to the direction of blood flow.
[0011] The valve can be configured to connect to a human or animal, for example, to a human or animal heart, or to a blood vessel adjacent to a human or animal heart.
[0012] The valve can be configured to connect to a heart by sewing, suturing, stitches or similar.
[0013] The valve can be configured to be implanted, welded, adhered or otherwise attached to a heart.
[0014] The leaflet can be moved between open and closed configurations in response to a change in pressure through the leaflet.
[0015] A heart valve like this can allow blood flow through the valve in a forward direction when the leaflet is in the open configuration and can restrict or prevent blood flow through the valve in a backward direction when the leaflet is in the closed configuration .
[0016] The valve can be formed to have a natural configuration.
[0017] The valve can be non-tensioned or have minimal internal stresses in the natural configuration.
[0018] The valve can have a standard configuration that corresponds to the natural configuration.
[0019] The valve can be configured in such a way that the leaflet returns to the standard configuration in the absence of any pressure differential through the leaflet.
[0020] The arrangement of the leaflet in the standard configuration can be intermediate to the arrangement of the leaflet in the open and closed configurations.
[0021] The leaflet can have a lateral cross section that defines a convex portion outward, a concave portion outward and a junction between the convex and concave portions in the open configuration, in the closed configuration and in all intermediate configurations between the open configurations and closed, including the default configuration.
[0022] The valve can be configured to allow movement of the leaflet from the standard configuration to the closed configuration in response to an appropriate pressure differential.
[0023] The valve can be configured to allow movement of the leaflet from the standard configuration to the open configuration in response to an appropriate pressure differential.
[0024] The valve can be configured in such a way that the leaflet moves easily from the standard configuration to the open configuration in response to an appropriate pressure differential.
[0025] At least one of the junction, the convex portion and the concave portion may vary according to a pressure differential across the leaflet.
[0026] First and second attachment lines straight or at least partially straight and the configuration of the lateral cross section through the leaflet can guarantee that the leaflet is movable between the open and closed configurations according to a preferred movement mode in which changes of curvature of the leaflet are distributed over the entire width of the leaflet, and not basically by changes close to the leaflet attachment lines in the support structure, as is the case for many conventional designs of flexible bioprosthetic and synthetic leaflet valves. Such a movement mode can ensure that the leaflet is mobile between open and closed configurations, while still inducing lower folding stresses in the leaflet, compared to the folding stresses induced in known artificial heart valves. For a given leaflet stiffness, this can reduce the folding stresses induced in the leaflet during heart valve operation and thereby reduce the leaflet's susceptibility to damage such as tearing, cracking or the like. Thus, for a given stiffness of the leaflet, this can lead to greater heart valve reliability.
[0027] The first and second attachment lines straight or at least partially straight and the configuration of the lateral cross section through the leaflet can ensure that the leaflet adopts a shape that provides a low restriction on fluid flow when the leaflet is in the open configuration compared to known bioprosthetic heart valves or known synthetic leaflet heart valves. Consequently, a heart valve like this may have better hemodynamic performance for a given leaflet stiffness. Alternatively, for a given hemodynamic performance, a heart valve like this can be built using a more rigid leaflet. For example, a more rigid leaflet material can be selected and / or the leaflet thickness can be increased without compromising hemodynamic performance in relation to the hemodynamic performance of known bioprosthetic heart valves or known synthetic leaflet heart valves. This may, in particular, allow the use of higher and more rigid booklet materials with greater durability and greater biostability without compromising hemodynamic performance.
[0028] The first and second attachment lines straight or at least partially straight and the configuration of the lateral cross section through the leaflet can guarantee that the leaflet adopts a predetermined shape in response to a given pressure differential across the leaflets. More specifically, the convex and generally concave portions can vary in a predetermined manner in response to changes in the pressure differential across the leaflets. This can prevent the leaflet from taking an arbitrary shape during reconfiguration between the open and closed configurations and can, in particular, prevent the leaflet from being folded, warped or wrinkled during reconfiguration. For a given leaflet stiffness, this can reduce the folding stresses induced in the leaflet during heart valve operation and thereby reduce the leaflet's susceptibility to damage such as tearing, cracking or the like. Thus, for a given stiffness of the leaflet, this can lead to greater heart valve reliability.
[0029] The first and second attachment lines can generally be parallel.
[0030] The first and second attachment lines can extend in a direction that is generally parallel to the axis.
[0031] The convex portion may extend from the first attachment line to the junction.
[0032] The concave portion can extend from the second attachment line to the junction.
[0033] The lateral cross section can have a curvature that is discontinuous at the junction.
[0034] The lateral cross section can have a curvature that is continuous at the junction.
[0035] The junction can comprise an inflection region.
[0036] The junction can comprise an inflection point.
[0037] The junction can comprise a curved region.
[0038] The junction can comprise a straight region.
[0039] The configuration of the lateral cross section of the leaflet can guarantee that the leaflet adopts a predetermined shape that provides better blood flow characteristics. The configuration of the lateral cross section of the leaflet can give a spiral movement to the blood that passes through the valve, in such a way that the blood flow through the valve mimics the conditions of physiological blood flow through a natural heart valve more precisely when compared to arrangements of known artificial heart valve. A spiral blood flow like this can improve the efficiency of the heart compared to the efficiency of the heart when using a known artificial heart valve.
[0040] The leaflet can be configured to define a lateral cross section that provides a counterclockwise spiral blood flow when viewed from an outlet side of the valve. The lateral cross section through the leaflet can define the outward convex portion followed by the outward concave portion in general in a counterclockwise direction around the axis defined by the opening when viewed from the outlet side of the valve.
[0041] The leaflet can be configured to define a lateral cross section that gives a spiral blood flow in a clockwise direction when viewed from the outlet side of the valve. The lateral cross section through the leaflet can define the concave outward portion followed by the convex outward portion generally in a counterclockwise direction around the axis defined by the opening when viewed from the outlet side of the valve.
[0042] The artificial heart valve can be configured in such a way that movement of the leaflet between open and closed configurations causes the convex portion of the lateral cross section to pivot around the first attachment line.
[0043] The artificial heart valve can be configured in such a way that movement of the leaflet between the open and closed configurations causes the concave portion of the lateral cross-section pivot around the second attachment line.
[0044] The artificial heart valve can be configured in such a way that movement of the leaflet results in a change in the curvature of the convex and concave portions of the lateral cross section.
[0045] The artificial heart valve can be configured in such a way that movement of the leaflet out of the closed configuration to the open configuration results in a reduction in the curvature of the convex portion of the lateral cross section.
[0046] The artificial heart valve can be configured in such a way that movement of the leaflet out of the closed configuration to the open configuration results in an increase in the curvature of the concave portion of the lateral cross section.
[0047] The artificial heart valve can be configured in such a way that movement of the leaflet from the closed configuration to the open configuration results in an initial increase in curvature of the convex and concave portions of the lateral cross section of the leaflet followed by a decrease in the curvature of the portion convex and an additional increase in the curvature of the concave portion.
[0048] The artificial heart valve can be configured in such a way that movement of the leaflet results in movement of the junction along the lateral cross section of the leaflet.
[0049] The artificial heart valve can be configured in such a way that movement of the leaflet out of the closed configuration into the open configuration results in movement of the joint along the lateral cross section of the leaflet out of the first attachment line towards the second attachment line.
[0050] The artificial heart valve can be configured in such a way that movement of the leaflet from the closed configuration to the open configuration initially results in the movement of the joint along the lateral cross section of the leaflet followed by movement of the joint along the lateral cross section of the leaflet. leaflet from the first attachment line towards the second attachment line.
[0051] A length of the convex portion of the lateral cross section may comprise a greater proportion of a total length of the lateral cross section in the open configuration than in the closed configuration.
[0052] The brochure can be connected to the support structure along an attachment baseline.
[0053] The attachment baseline may extend at least partially around the opening.
[0054] The attachment baseline can extend circumferentially around the opening.
[0055] The attachment baseline can be adjacent to the opening.
[0056] The attachment baseline can be convex outward.
[0057] The leaflet may comprise a free edge that is movable in relation to the support structure.
[0058] The free edge may extend opposite the baseline of attachment between the first and second attachment lines.
[0059] The free edge may define an outward convex portion, an outward concave portion and a junction between the convex and concave portions.
[0060] The junction of the free edge can be located substantially halfway along the free edge between the first and second attachment lines.
[0061] The free edge of the leaflet can be greater than the baseline of attachment.
[0062] Each of a plurality of lateral cross sections made through the leaflet between the attachment baseline and the free edge can define an outward convex portion, an outward concave portion and a junction between the convex and concave portions.
[0063] The leaflet can define a coaptation region that extends from the free edge and that has a plurality of generally identical lateral cross sections.
[0064] A surface arranged into a coaptation region such as this can form a better seal against a complementary surface arranged into an additional coaptation region, for example, a coaptation region arranged into an additional leaflet, for prevent or reduce blood reflux through the opening when the leaflet is in the closed configuration.
[0065] The coaptation region can extend from the free edge to an outline that is located between the free edge and the attachment baseline.
[0066] A lateral cross section that is closer to the baseline of attachment but between the baseline of attachment and the contour of the coaptation region may have a larger convex portion and a smaller concave portion than a lateral cross section that it is farthest from the attachment baseline, but between the attachment baseline and the outline of the coaptation region.
[0067] The joining of each of the lateral cross sections made through the leaflet between the attachment baseline and the contour of the coaptation region can be along a predetermined junction reference line when the leaflet is in a configuration such as formed or natural.
[0068] The reference line of the junction can be at least partially straight.
[0069] The reference line of the junction may extend from a point substantially halfway along the contour of the coaptation region to an intersection point between the second attachment line and the attachment baseline. An arrangement like this can ensure that the leaflet in its configuration as formed or natural defines a generally three-dimensional conical region with an apex located at the point of intersection of the second attachment line, or adjacent to it, with the attachment baseline . A three-dimensional leaflet form like this can serve to distribute stresses across the leaflet width during leaflet movement between the open and closed configurations.
[0070] The support structure may comprise a base portion that defines the opening.
[0071] The base portion can be curved. The base portion may comprise a loop, or be generally annular. The base portion can be circular, oval or the like.
[0072] The base portion can be configured for attachment to a human or animal, for example, to a human or animal heart or to a blood vessel adjacent to a human or animal heart. The base portion can be configured to be implanted, sutured, welded, adhered to or otherwise attached to a human or animal.
[0073] The opening can be curved. The opening can be circular, oval or similar.
[0074] The leaflet can be connected to the base portion along an attachment baseline.
The support structure may comprise a plurality of pillar portions extending from the base portion.
[0076] The plurality of pillar portions can be arranged around the opening.
[0077] Each pillar portion can extend in a general axial direction.
[0078] Each column portion can comprise a straight edge that extends in a general axial direction. For example, the base portion can define a lateral plane and the straight edge of each column portion can extend in a direction perpendicular to the lateral plane of the base portion.
[0079] The support structure can comprise first and second pillar portions that define the first and second attachment lines.
[0080] The leaflet can be attached between two pillar portions.
[0081] The leaflet can be attached between two adjacent pillar portions.
[0082] The valve can be configured in such a way that a junction of a free edge of the leaflet is on one side of a straight line between the two pillars to which the leaflet is attached when the leaflet is in a closed configuration. The valve can be configured in such a way that the junction of the leaflet's free edge is on the other side of the straight line between the two pillars to which the leaflet is attached when the leaflet is in an open configuration.
[0083] A configuration like this can result in a compressive force being applied to the leaflet as the leaflet passes between the two pillars during leaflet movement between open and closed configurations. Such a compressive force can accentuate a curvature of the convex and concave portions of a lateral cross section of the leaflet as the leaflet passes between the two pillars.
[0084] The pillar portions can extend from the base portion in an oblique outward configuration. Each column portion can define an acute angle with respect to the axial direction. Each column portion can define an angle with respect to the axial direction of between 0 and 30 °, between 0 and 10 °, or between 0 and 5 °. An oblique outward configuration like this of the pillar portions can allow the leaflet to move between the open and closed configurations more easily. This can reduce tension induced in the leaflet during its movement.
[0085] The leaflet can extend through the first pillar portion, and around it, along the first attachment line.
[0086] The leaflet can extend through the second pillar portion, and around it, along the second attachment line.
[0087] The first and second pillar portions can each define a hole that extends through them.
[0088] The leaflet can extend through the hole that extends through the first pillar portion along the first attachment line.
[0089] The leaflet can extend through the hole that extends through the second pillar portion along the second attachment line.
[0090] An arrangement like this can serve to provide a robust anchor between the leaflet and each of the first and second pillar portions.
[0091] The respective holes extending through the first and second pillar portions can be angled with respect to a radial direction relative to the axis defined by the opening. This can ensure that the leaflet enters and / or leaves the respective holes that extend through the first and second pillar portions with a predetermined configuration such as a predetermined angle. An angle like this can ensure that a lateral cross section of the leaflet as the leaflet emerges in the respective holes extending through the first or second pillar portion has a curvature that is continuous with an outward convex portion curvature or a concave out of the lateral cross-section of the leaflet adjacent to the first or second pillar portion.
[0092] The holes that extend through the first and second pillar portions can each be elongated. For example, the holes extending through the first and second pillar portions can each comprise a slot or the like.
[0093] The first and second pillar portions can each define a plurality of holes extending through them.
[0094] The leaflet can extend through each of the plurality of holes that extends through the first and second pillar portions.
[0095] The leaflet can be connected to the base portion along an attachment baseline.
[0096] The leaflet can extend through the base portion, and around it.
[0097] The base portion can define a hole that extends through it.
[0098] The leaflet can extend through the hole defined by the base portion.
[0099] An arrangement like this can serve to provide a robust anchor between the leaflet and the base portion.
[00100] One or more holes that extend through the base portion can be angled with respect to a radial direction relative to an axis defined by the opening.
This can ensure that the leaflet enters and / or leaves one or more holes that extend through the base portion with a predetermined configuration, such as a predetermined angle. An angle like this can ensure that a lateral cross section of the leaflet as the leaflet emerges in one or more holes extending through the base portion has a curvature that is continuous with a curvature of the leaflet adjacent to the base portion.
[00102] One or more holes that extend through the base portion can be elongated. For example, one or more holes extending through the base portion can comprise slits or the like.
[00103] The base portion can define a plurality of holes extending through it.
[00104] The leaflet can extend through the plurality of holes defined by the base portion.
[00105] The leaflet can be formed entirely in the support structure.
[00106] The leaflet may comprise a synthetic material.
[00107] The leaflet may comprise a polymeric material.
[00108] The brochure may comprise polyurethane.
[00109] The brochure can comprise a composite material including a matrix material and one or more reinforcement elements. For example, the booklet may comprise a matrix material and one or more reinforcement elements such as fibers, fibrils, threads, nanotubes or the like.
[00110] The brochure can comprise polyurethane reinforced with carbon nanotubes.
[00111] The heart valve may comprise a plurality of flexible leaflets, each leaflet being connected to the support structure along the corresponding first and second attachment lines in such a way that each leaflet is mobile in relation to the support structure between an open configuration , in which the leaflet allows blood flow through the opening, and a closed configuration, in which the leaflet restricts blood flow through the opening, in which a lateral cross section made through each leaflet in a plane lateral to the axis defines a convex portion corresponding outward, a corresponding outward concave portion and a corresponding junction between the convex and concave portions.
[00112] The curvature of a convex portion of a first leaflet can be substantially matched with the curvature of a concave portion of a second leaflet adjacent to the first leaflet in a lateral cross section made through the first and second leaflets.
[00113] A valve like this can guarantee that each leaflet at least partially obstructs blood flow through the valve when the leaflets are configured in the closed configuration.
[00114] Each leaflet can define a coaptation surface that is configured to engage one or more complementary coaptation surfaces of one or more other brochures. Such coaptation surfaces can form a better seal to prevent or reduce blood reflux through the opening when the leaflets are in the closed configuration.
[00115] Each pillar portion can have a plurality of leaflets attached to it.
[00116] Each leaflet can be formed integrally in the frame.
[00117] The valve can comprise three leaflets.
[00118] The valve can comprise three pillars.
[00119] A valve like this can provide a prosthesis for the ventricular-arterial valves (aortic and pulmonary).
[00120] The valve can comprise two leaflets.
[00121] The valve can comprise two pillars.
[00122] A valve like this can provide a prosthesis for the atrioventricular valves (mitral and tricuspid).
[00123] At least a portion of the support structure can be rigid or semi-rigid.
[00124] At least a portion of the support structure can be flexible. For example, at least a portion of the support structure can be expandable.
[00125] A support structure like this can allow the valve to be compressed or collapsed for insertion into an individual's body, for example, by means of a blood vessel. A support structure like this can allow the valve to expand in situ by a time scale to accommodate the growth of the individual.
[00126] A support structure like this can also accommodate the growth of an individual such as a child.
[00127] The support structure may comprise a material that is more rigid than a material in the brochure.
[00128] The support structure can comprise a metal.
[00129] The support structure can comprise stainless steel.
[00130] The support structure can comprise titanium.
[00131] The support structure can comprise a polymer such as polyether ether ketone (PEEK) or the like.
[00132] At least a portion of the support structure can be flexible or collapsible.
[00133] The support structure can comprise a frame.
[00134] The support structure can have a round profile. For example, the support structure may have rounded corners. A support structure like this would reduce the risk of injury to a human or animal subject during heart valve deployment or implantation in a human or animal subject.
[00135] The valve can be configured for percutaneous delivery.
[00136] The support structure can comprise a stent.
[00137] The support structure can comprise a portion of a heart. In other words, the leaflet can be configured for direct attachment to the heart of a human or an animal.
[00138] The valve can comprise first and second interchangeable parts.
[00139] The first part can be configured for connection in a human or animal, for example, in a human or animal heart or in a blood vessel adjacent to a human or animal heart.
[00140] The second part can comprise the leaflet. The use of such first and second parts can allow the first part to be attached to a heart without risk of damage to a second part leaflet.
[00141] The first part can be configured to connect to a heart by sewing, suturing, stitches or similar.
[00142] The first part can be configured to be implanted, welded, adhered or otherwise attached to a heart.
[00143] The first part can be curved. The first part may comprise a loop or be generally annular. The first part can be circular, oval or similar.
[00144] The first part may comprise a sewing ring.
[00145] The first part can be configured for connection to a heart by passing wire, wire or similar around the first part and within a wall of a heart.
[00146] The first and second parts may comprise complementary interengagement resources.
[00147] The first and second parts can comprise male and female resources.
[00148] One of the first and second parts can comprise one or more projections and the other of the first and second parts can comprise one or more recesses, in which each recess is configured to receive a projection.
[00149] The first and second parts can be configured to provide a lockable connection with each other. For example, one of the first and second parts may comprise a bayonet and the other of the first and second parts may comprise a socket configured to receive the bayonet. The bayonet can be configured to lock into the socket by twisting the first and / or second parts in relation to each other.
[00150] The support structure can comprise a third part such as an adaptation part to facilitate a connection between the first and second parts.
[00151] According to a second aspect of the present invention, an artificial heart valve is provided comprising a support structure defining an opening for blood flow and a flexible leaflet connected to the support structure along the first and second attachment lines, in that the leaflet is mobile in relation to the support structure between an open configuration, in which the leaflet allows blood flow through the opening, and a closed configuration, in which the leaflet restricts blood flow through the opening, and in which the opening defines an axis and a lateral cross section made through the leaflet in a plane lateral to the axis defines an outward convex portion extending from the first attachment line to a junction and an outward concave portion extending from the junction to the second attachment line.
[00152] The first and second attachment lines can be at least partially straight.
[00153] The first and second attachment lines can have a generally parallel relationship.
[00154] The first and second attachment lines can extend at least partially in a direction parallel to the axis defined by the opening.
[00155] The first and second attachment lines can be at least partially curved.
[00156] It should be understood that one or more of the optional features described with respect to the first aspect can be applied alone or in any combination in relation to the second aspect.
[00157] According to a third aspect of the present invention, an artificial heart valve is provided comprising a support structure and a fully formed flexible leaflet, wherein the support structure defines an opening for blood flow and a through hole and the leaflet extends through the through hole and around a portion of the support structure.
[00158] The leaflet can be formed integrally in order to extend through the through hole.
[00159] The leaflet can be integrally formed so as to extend around a portion of the support structure adjacent to the through hole.
[00160] An arrangement like this can serve to provide a robust anchor between the leaflet and the support structure.
[00161] The through hole can be elongated.
[00162] The through hole may comprise a crack or the like.
[00163] The through hole can be angled. A through hole like this can serve to ensure that the leaflet enters and / or leaves the hole with a predetermined configuration such as a predetermined angle.
[00164] The support structure can define a plurality of through holes extending through it.
[00165] The leaflet can be formed integrally in order to extend through each of the plurality of through holes.
[00166] The leaflet can be integrally formed so as to extend around a portion of the support structure adjacent to each of the plurality of through holes.
[00167] Each of the plurality of through holes can be elongated.
[00168] Each of the plurality of through holes can comprise a slot or the like.
[00169] It should be understood that one or more of the optional features described with respect to the first aspect can be applied alone or in any combination in relation to the third aspect.
[00170] In accordance with a fourth aspect of the present invention, an artificial heart valve is provided comprising a support structure and a flexible leaflet connected to the support structure, each leaflet being formed so as to provide a predetermined shape by moving the leaflet between open and closed settings.
[00171] The leaflet can be formed in such a way as to comprise a lateral cross section that defines a convex portion outward, a concave portion outward and a junction between the convex and concave portions.
[00172] A leaflet like this can guarantee that the convex and concave portions move in a predetermined manner in response to changes in pressure differential across the leaflet in order to avoid warping the leaflet.
[00173] In use, a valve like this can be implanted in a human or animal individual in such a way that the leaflet extends along a direction of blood flow and the lateral cross section through the leaflet is aligned so that it is in the general lateral with the direction of blood flow.
[00174] The heart valve can comprise a plurality of flexible leaflets, in which each leaflet is connected to the support structure.
[00175] It should be understood that one or more of the optional features described with respect to the first aspect can be applied alone or in any combination in relation to the fourth aspect.
[00176] According to a fifth aspect of the present invention, a method is provided for implanting an artificial heart valve comprising: providing an artificial heart valve comprising a support structure defining an opening for blood flow and a flexible leaflet connected to the support structure along the first and second attachment lines at least partially straight, in which the leaflet is movable in relation to the support structure between an open configuration, in which the leaflet allows blood flow through the opening, and a closed configuration, in which the leaflet restricts blood flow through the opening, and where the opening defines an axis and a lateral cross section made through the leaflet in a plane lateral to the axis defines an outward convex portion, an outward concave portion and a junction between the portions convex and concave; and implanting the artificial heart valve in an individual in such a way that the axis defined by the opening extends along a direction of blood flow.
[00177] It should be understood that one or more of the optional features described in relation to the first aspect can be applied alone or in any combination in relation to the fifth aspect.
[00178] According to a sixth aspect of the present invention, a leaflet is provided for an artificial heart valve comprising first and second ends which are configured for connection in a support structure along the respective first and second attachment lines at least partially straight, the leaflet being movable between an open configuration, in which the leaflet allows blood flow through an opening defined by the support structure, and a closed configuration, in which the leaflet restricts blood flow through the opening of the support structure, in that a lateral cross section made through the leaflet in a plane extending between the ends of the leaflet defines an outward convex portion, an outward concave portion and a junction between the convex and concave portions.
[00179] It should be understood that one or more of the optional features described in relation to the first aspect can be applied alone or in any combination in relation to the sixth aspect.
[00180] In accordance with a seventh aspect of the present invention, a method of manufacturing an artificial heart valve is provided comprising: connecting a flexible leaflet to a support structure along the first and second attachment lines at least partially straight, in that the leaflet is movable in relation to the support structure between an open configuration, in which the leaflet allows blood flow through an opening defined by the support structure and a closed configuration in which the leaflet restricts blood flow through the opening, and in that the opening defines an axis and a lateral cross section made through the leaflet in a plane lateral to the axis defines a convex portion outward, a concave portion outward and a junction between the convex and concave portions.
[00181] The method may comprise immersing the support structure in a liquid.
[00182] The method may comprise leaving or causing the liquid to solidify in order to define the flexible leaflet.
[00183] The method may comprise: assembling the support structure in a former before coating the support structure by immersion in the liquid; and removing the support structure and the flexible leaflet from the trainer after the liquid has solidified.
[00184] The trainer can comprise an external surface on which the liquid solidifies in order to define the flexible leaflet.
[00185] The external surface can be configured to define the flexible leaflet of any of the heart valves from the first to the fourth aspects by solidifying a liquid in it.
[00186] The trainer can comprise a base portion for receiving a base portion of the support structure and a portion of the mandrel with the outer surface on which the liquid solidifies in order to define the flexible leaflet.
[00187] The method may comprise immersing the trainer with the support structure mounted on it in the liquid in order to coat the external surface of the trainer between the third edge and an upper lateral coaptation plane located between the lower lateral coaptation plane and the fourth edge.
[00188] The method may comprise trimming the leaflet through the coaptation surface of the leaflet after the liquid has solidified in order to define a free edge of the leaflet.
[00189] The outer surface of the trainer can be configured to eliminate liquid adhesion on the outer surface.
[00190] The liquid may comprise a molten material.
[00191] The liquid may comprise a synthetic material.
[00192] The liquid may comprise a polymeric material.
[00193] The liquid may comprise polyurethane.
[00194] The liquid can comprise a solution.
[00195] The liquid may comprise a polyurethane solution.
[00196] A method like this can guarantee the integral formation and safe attachment of the leaflet to the support structure by coating the support structure with a continuous sheet of the liquid before drying. This has the advantage that the attachment of the leaflet is not limited to the adhesion of liquid material to one or more portions of the support structure, thus reducing the risk of the leaflet being detached from the support structure, for example, during implantation or operation of the valve.
[00197] The method may comprise aligning the support structure and a trainer in relation to each other.
[00198] The method may comprise immersing the support structure and the former together as a set in the liquid.
[00199] The method may comprise leaving or causing the liquid to solidify or dry in the former and removing the former after the liquid has solidified.
[00200] A trainer like this can allow the formation of flexible leaflets and, in particular, allow the formation of flexible leaflets with free edges that are mobile in relation to the support structure.
[00201] The method may comprise providing the support structure and the trainer with equal or corresponding alignment resources to allow the support structure and the trainer to be aligned in relation to each other. For example, the method may comprise providing the support structure and the trainer with complementary interengaging resources.
[00202] The method may comprise providing the trainer with an alignment feature for each column portion of the support structure, and providing each column portion of the support structure with an alignment feature configured for alignment and / or engagement with a feature different from the trainer.
[00203] The method may comprise providing each pillar portion of the support structure with a longitudinal opening such as a groove, slot or the like.
[00204] The method may comprise providing each pillar portion of the support structure with a longitudinal recess such as a notch or the like.
[00205] The method may comprise providing the trainer with a longitudinal projection for each column portion of the support structure, in which each longitudinal projection is configured to align or engage with a longitudinal opening or recess of a different column portion.
[00206] A method like this can allow a crack formed in a pillar portion of a support structure to be aligned with an edge of the trainer, thus ensuring that leaflets formed by immersion coating of the support structure extend around one pillar portion and through the slot formed in it for secure attachment to it.
[00207] The method may include attaching the support structure and the trainer.
[00208] A step like this can guarantee that a relative alignment between the support structure and the former is maintained during immersion coating.
[00209] The method may comprise providing the support structure and / or the trainer with equal or corresponding resources to allow the support structure and the trainer to be attached to each other. The method may, in particular, comprise providing the support structure with a clearance hole for a locating pin or fastener such as a threaded fastener and providing the former with a corresponding hole, such as a threaded hole, to receive the pin location or fastener.
[00210] The method may comprise injecting a release fluid through a through hole that extends longitudinally through the former.
[00211] The method may comprise preventing liquid from solidifying or drying over a first end of the through hole. Injecting a fluid through the through hole can help to release the artificial heart valve from the former once the liquid from which the leaflets are formed has solidified or dried over a second end of the release hole opposite the first end of the through hole.
[00212] The method may comprise injecting a liquid release fluid such as water, saline or the like through the through hole.
[00213] The method may comprise injecting a gaseous release fluid such as air or the like through the through hole.
[00214] The method may comprise using a syringe to inject a release fluid through the through hole.
[00215] A method like this can result in the formation of each leaflet and its attachment to the base portion along a base edge of the leaflet. Such a method can result in the formation of each leaflet in such a way that the free edge is greater than the base edge.
[00216] A method like this can result in the formation of each leaflet in such a way that each leaflet is attached between two pillar portions of a support structure.
[00217] A method like this can result in the formation of each leaflet in such a way that each leaflet is attached to a pillar portion of a support structure along a side edge of the leaflet.
[00218] Such a method can result in the formation of each leaflet in such a way that each pillar portion of a support structure can have a plurality of leaflets attached to it.
[00219] The trainer can define a through hole extending through it that is configured to receive a closing element.
[00220] The method may comprise: closing the through hole with the closing element before immersing the former in the liquid in order to prevent liquid from entering the through hole; removing the closing element from the through hole after the liquid has solidified; and injecting a release fluid to aid in the separation of the solidified liquid from the outer surface of the mandrel portion of the former.
[00221] It should be understood that one or more of the optional features described in relation to the first aspect can be applied alone or in any combination in relation to the seventh aspect.
[00222] According to an eighth aspect of the present invention, a former is provided for use in the manufacture of an artificial heart valve comprising an outer surface with at least partially straight first and second edges, in which a lateral cross section made through the surface external in a lateral plane to the first and second edges defines an outward convex portion, an outward concave portion and a junction between the convex and concave portions.
[00223] A trainer like this can be used to manufacture an artificial heart valve according to any of the first to fourth aspects of the present invention or to manufacture a leaflet for an artificial heart valve according to the sixth aspect, or for use in the method of manufacturing an artificial heart valve according to the seventh aspect.
[00224] The external surface can be configured to allow solidification or drying of a liquid on it during immersion molding.
[00225] The external surface can be configured to eliminate liquid adhesion on the external surface during immersion molding.
[00226] The external surface can be coated with a non-adherent material.
[00227] The external surface can be polished.
[00228] The outer surface may comprise stainless steel.
[00229] The trainer can be configured to receive a support structure from an artificial heart valve.
[00230] The trainer can be configured to allow alignment of the support structure with the trainer.
[00231] The trainer can be configured to allow attachment of the support structure to the trainer.
[00232] The former may comprise a base portion for receiving a base portion of the support structure and a portion of the mandrel comprising the outer surface on which the liquid solidifies in order to define the flexible leaflet.
[00233] The outer surface may comprise a third edge adjacent to the base portion of the trainer and a fourth edge opposite the third edge.
[00234] Each of a plurality of lateral cross sections made through the outer surface of the former between the third edge and the fourth edge can define an outward convex portion extending from the first edge to a junction and an outward concave portion extending from the second edge to the junction.
[00235] The trainer can comprise a through hole extending through it.
[00236] The through hole can be configured to receive a closing element to prevent liquid from entering the through hole during immersion molding.
[00237] The through hole can be configured to receive a release fluid to aid in the separation of the solidified or dry liquid from the external surface after immersion molding.
[00238] The through hole can be configured to receive a liquid release fluid such as water, saline or similar.
[00239] The through hole can be configured to receive a gaseous release fluid such as air or the like.
[00240] The through hole can be configured to receive pressurized release fluid.
[00241] The through hole can be configured to receive a syringe containing the release fluid.
[00242] The liquid may comprise a molten material.
[00243] The liquid may comprise a synthetic material.
[00244] The liquid may comprise a polymeric material.
[00245] The liquid may comprise polyurethane.
[00246] The liquid can comprise a solution.
[00247] The liquid may comprise a polyurethane solution.
[00248] It should be understood that one or more of the optional features described in relation to the first aspect can be applied alone or in any combination in relation to the eighth aspect.
[00249] According to a ninth aspect of the present invention, there is provided a method for use in implanting an artificial heart valve in a human or animal subject comprising:
[00250] sew an attachment ring in a passage within a human or animal individual by tying a suture length around at least a portion of an annular base portion of the attachment ring.
[00251] The method may comprise using a continuous suture length and repeatedly looping the suture around the annular base portion. The use of a running suture like this can simplify the sewing process.
[00252] A method like this may allow the use of an attachment ring with a base portion of less radial extent compared to known seam rings that have a base portion of greater radial extent to allow attachment by seam in a passage within of a human or animal individual, passing sutures through the base portion. The use of a base portion of less radial extension may allow the use of the attachment ring with an artificial heart valve with a larger opening for blood flow.
[00253] An external surface of the attachment ring can be configured to seal an internal surface of the passage in a sealed manner.
[00254] The method may comprise keeping an artificial heart valve in a sealing engagement with the annexation ring in order to provide a sealed periphery around a blood flow path that extends through the annexation ring and the heart valve.
[00255] According to a tenth aspect of the present invention, an attachment ring is provided for use in implanting an artificial heart valve in a human or animal individual, the attachment ring comprising an annular base portion, wherein the ring attachment method is configured to be sewn in a passage within a human or animal individual, looping a suture length around at least a portion of the base portion.
[00256] An external surface of the attachment ring can be configured to seal an internal surface of the passage in a sealed manner.
[00257] The attachment ring can be configured to be coupled with an artificial heart valve in order to provide a sealed periphery around a blood flow path that extends through the heart valve and the attachment ring.
[00258] The attachment ring can be configured to engage with the heart valve so that an internal surface of the attachment ring is kept in seal engagement with an external surface of the heart valve.
[00259] The base portion can have a radial extension between 0 and 3 mm, between 0 and 2 mm, or between 0 and 1 mm. This may allow the use of the attachment ring with an artificial heart valve with a larger opening for blood flow.
[00260] The base portion may comprise an annular support structure that is configured to prevent the passage of a surgical needle through it during surgery. In contrast, known sewing rings comprise an annular support structure that is configured to allow a surgical needle to pass through it during surgery.
[00261] The support structure can comprise a metal, stainless steel, titanium, a polymer and / or polyether ether ketone (PEEK).
[00262] The attachment ring may comprise a resiliently deformable cover material that extends around at least a portion of the support structure.
[00263] The covering material may comprise Dacron.
[00264] The attachment ring may comprise a coupling feature for engaging a complementary feature of an artificial heart valve.
[00265] The attachment ring can define an opening that defines an axial direction and the engagement feature can be configured to allow engagement with a complementary feature of an artificial heart valve along the axial direction.
[00266] The coupling feature can extend along the axial direction. This can simplify the engagement of an artificial heart valve with the attachment ring during surgery, for example, within the limits of a passage.
[00267] The coupling feature may have a non-circularly symmetrical cross section, for example, a cross section in general square or rectangular. This can ensure the engagement of the artificial heart valve and the attachment ring when in the correct relative alignment.
[00268] The coupling feature can be a female coupling feature.
[00269] The coupling feature can be a male coupling feature.
[00270] The coupling feature can be configured for locking coupling with a complementary feature of an artificial heart valve.
[00271] The coupling feature can be configured to deform resiliently by engaging with a more rigid feature complementary to an artificial heart valve.
[00272] The coupling feature can be configured to be rigid in order to cause resilient deformation of a complementary feature of an artificial heart valve by engaging it.
[00273] The attachment ring may comprise a plurality of coupling features to engage a plurality of complementary features of an artificial heart valve.
[00274] According to an eleventh aspect of the present invention, an artificial heart valve configured to be maintained in a sealing engagement with the attachment ring according to the eleventh aspect is provided in order to provide a sealed periphery around one blood flow path that extends through the heart valve and attachment ring.
[00275] According to an twelfth aspect of the present invention, an artificial heart valve assembly comprising the attachment ring according to the eleventh aspect is provided in engagement with an artificial heart valve according to the eleventh aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[00276] The present invention will now be described only as a non-limiting example with reference to the following drawings, of which:
[00277] Figure 1 (a) is a cut-away perspective view of a natural aortic valve with part of the aortic valve and a leaflet removed;
[00278] Figure 1 (b) is a view of an outlet side of the natural aortic valve of figure 1 (a) in a closed configuration;
[00279] Figure 1 (c) is a longitudinal cross section of the natural aortic valve of figure 1 (a) in a closed configuration;
[00280] Figure 1 (d) is a view of an outlet side of the natural aortic valve of figure 1 (a) in an open configuration;
[00281] Figure 1 (e) is a longitudinal cross section of the natural aortic valve of figure 1 (a) in an open configuration showing a blood flow direction;
[00282] Figure 2 (a) is a perspective view of a pericardial cardiac bioprosthetic valve;
[00283] Figure 2 (b) is a view and an outlet side of the cardiac bioprosthetic valve of figure 2 (a) when the valve is in a closed configuration;
[00284] Figure 2 (c) is a side view of the outlet of the bioprosthetic cardiac valve of figure 2 (a) when the valve is in an open configuration;
[00285] Figure 3 (a) is a perspective view of a synthetic polymer leaflet valve with three relatively rigid leaflets and that has low hemodynamic performance;
[00286] Figure 3 (b) is a side view of the outlet of the synthetic polymer leaflet valve of figure 3 (a) when the valve is in an open configuration where the valve has an improper opening;
[00287] Figure 3 (c) is a perspective view of a synthetic polymer leaflet valve with three relatively flexible leaflets and showing low durability;
[00288] Figure 3 (d) is a side view of the outlet of the synthetic polymer leaflet valve of figure 3 (c), when the valve is in an open configuration where the valve has high bending stresses;
[00289] Figure 3 (e) is a perspective view of the synthetic polymer leaflet valve of figure 3 (c) showing typical locations of leaflet tears after repeated cycling on a fatigue testing machine;
[00290] Figure 4 is a perspective view of a synthetic polymer leaflet valve constituting an embodiment of the present invention;
[00291] Figure 5 (a) is a perspective view of a frame of the synthetic polymer leaflet valve of figure 4;
[00292] Figure 5 (b) is a contour map of the leaflets of the synthetic polymer leaflet valve of figure 4 seen from an outlet side;
[00293] Figure 6 is a schematic cut-away perspective view of the synthetic polymer leaflet valve of Figure 4 in use in two different positions within an individual's heart;
[00294] Figure 7 is a partial contour map of the leaflets of the synthetic polymer leaflet valve of Figure 4 in different operational configurations seen from an outlet side;
[00295] Figure 8 is a perspective view of the valve frame of figure 4 positioned in a former for immersion molding.
[00296] Figure 9 is a longitudinal cross section through the trainer shown in figure 8;
[00297] Figure 10 (a) is a cross section of the valve of figure 4 in a longitudinal plane of the valve in the vicinity of a base portion of a valve frame showing a leaflet surrounding the base portion;
[00298] Figure 10 (b) is a cross section of the valve of figure 4 in a lateral plane of the valve in the vicinity of a column portion of the frame showing adjacent leaflets formed integrally surrounding the column portion and passing through a slot in the pillar portion;
[00299] Figure 11 is a view of an outlet side of a two-fold valve constituting an additional embodiment of the present invention showing a closed configuration (full line) and an open configuration (dashed line) of the valve leaflets;
[00300] Figure 12 (a) is a perspective view of a first alternative frame for the synthetic polymer leaflet valve of figure 4;
[00301] Figure 12 (b) is a cross section of the frame of figure 12 (a) in a longitudinal plane in the vicinity of a base portion of the frame of figure 12 (a) showing a leaflet extending through the base portion , and involving it;
[00302] Figure 13 (a) is a perspective view of a second alternative frame for the synthetic polymer leaflet valve of figure 4;
[00303] Figure 13 (b) is a cross section of the frame of figure 13 (a) in a longitudinal plane in the vicinity of a base portion of the frame of figure 13 (a) showing a leaflet extending through the base portion , and involving it;
[00304] Figure 14 (a) is a perspective view of a synthetic polymer leaflet valve constituting a further embodiment of the present invention;
[00305] Figure 14 (b) is a partial contour map of the leaflets of the synthetic polymer leaflet valve of figure 14 (a) in different operational configurations seen from an outlet side;
[00306] Figure 15 (a) is a schematic perspective view showing the assembly of an artificial heart valve frame and an attachment ring;
[00307] Figure 15 (b) is a schematic plan view of the attachment ring of figure 15 (a);
[00308] Figure 15 (c) is a schematic cross section through a base portion of the attachment ring of figure 15 (a); and
[00309] Figure 15 (d) is a schematic cross section through a base portion of the attachment ring of figure 15 (a) in the vicinity of a female engagement feature of the attachment ring. DETAILED DESCRIPTION OF THE DRAWINGS
[00310] Referring initially to figures 1 (a) to 1 (e), a natural aortic valve 2 comprises three bags or leaflets in the form of a bag of thin flexible fabric circumferentially attached to the base or aortic ring 6. Leaflets 4 are attached to an inner wall 8 of the aorta 6 along the curved edges 9. Each leaflet 4 has a free edge 10 that extends in a plane generally lateral to the aorta 6 and is attached to the wall of the aorta 8 in known regions 11 like commissures. As shown in figures 1 (b) and 1 (c), when valve 2 is in a closed configuration, the leaflets 4 are in juxtaposition with each other. As illustrated in figure 1 (b), when valve 2 is in a closed configuration, the free edges 10 are generally convex when viewed from the outlet side. The leaflets 4 passively move in response to pressure differences on either side of the valve 2 to the open configuration shown in figures 1 (d) and 1 (e), allowing unidirectional passage of blood from the left ventricle of the heart (not shown) during its contraction (emptying phase), and closing to prevent blood from refluxing into the ventricle during its relaxation (filling phase).
[00311] Figure 2 (a) shows a perspective view of the bioprosthetic valve 12, while figures 2 (b) and 2 (c) show the same bioprosthetic valve 12 in closed and open configurations, respectively. The bioprosthetic valve 12 comprises a pericardium leaf (the fibrous sac surrounding the heart) from a donor such as a calf, with pericardial leaflets 14 mounted inside (or around) a frame or stent 16 comprising a base portion of the ring. annular seam 18 and three projections 20 extending from it.
[00312] Figure 3 (a) illustrates a synthetic polymeric valve 22 comprising three relatively rigid polymer synthetic leaflets 24 attached to a frame 26. The frame 26 comprises a base portion of the annular seam ring 28 defining an inlet opening 29 (shown in figure 3 (b)) and three projections 30 extending from them. The projections 30 are on a generally cylindrical surface that extends through the base portion 28. In addition, the leaflets 24 are attached to the frame 26 along the respective curved lines 32 which are on the same surface in the overall cylindrical as the projections 30 A synthetic polymeric valve 22 like this may, however, have low hemodynamic function, as illustrated in figure 3 (b), which shows the synthetic polymeric valve 22 in an open configuration in which the valve still has an unacceptably high blood flow restriction . If the polymer from which the leaflets 24 are formed is rigid, not easily stretched (high modulus), or is used to make a thick leaflet, or has some form of internal reinforcement (such as a preformed fiber net, or carbon nanotubes incorporated), booklets 24 do not move easily in response to pressure differences across them. This results in clinically unacceptable obstruction of direct blood flow, and a slow closure, causing excessive reflux (“low hemodynamic function”). Thus, an outlet orifice 33 formed by the free edges 34 of the open leaflets 24 cannot reach the same dimensions as the inlet opening 29. In other words, partly due to the fact that the distance between adjacent commissures 35 measured around the inlet opening 29 of frame 26, (πd / 3, where d is the diameter of inlet opening 29), is greater than the length of a free edge 34 of a leaflet (d), and partly because of the commissural regions of the free edges 34 adjacent to the commissures 35 cannot open to a theoretical fully open position due to the inherent stiffness of the leaflets 24. The area restriction of the exit orifice increases with the increase of the stiffness of the leaflet. A rigid polymer valve 22 like this that opens improperly provides low hemodynamic function and can also create areas of slow blood flow below the slow opening leaflets 24 in the commissural regions, predisposing to local blood coagulation.
[00313] Figure 3 (c) illustrates a synthetic polymer valve 42 comprising three relatively flexible synthetic polymer leaflets 44 attached to a frame 46. The frame 46 comprises a base portion of the annular seam ring 48 defining an inlet opening 49 (shown in figure 3 (d)) and three projections 50 extending from it. The projections 50 are on a generally cylindrical surface extending through the base portion 48. The leaflets 44 are attached to the frame 46 along the respective curved lines 52 which are on the same surface in the overall cylindrical as the projections 50. A polymeric valve synthetic 42 such as this can provide low restriction when in the open configuration shown in figure 3 (d) at the expense of low durability, compared to the synthetic polymer valve 22 of figure 3 (a). If the polymer from which the leaflets 44 are made is easily distensible (low modulus), or if the leaflets 44 are very thin, the leaflets 44 will move easily in response to pressure differences across them ("good hemodynamic function"). Although such leaflets 44 provide little obstruction to direct blood flow and close easily to minimize backflow through valve 42, durability can be limited. The valve 42 is unable to withstand the opening and closing stresses contained in the leaflets 44, and these eventually tear, as illustrated in figure 3 (e).
[00314] Features of valve design 42 of figures 3 (c) to 3 (e) can also contribute to poor durability. The full opening of the leaflets 44 requires sharp folding (small radius of curvature) of the leaflets 44 in the region of commissures 55, as a result of which local stresses, particularly in the commissural regions of the leaflets 44, can be very high, and can lead to the formation of slots 58 in the commissural regions of the leaflets 44, as shown in figure 3 (e). In addition, during the opening of the polymer leaflets 44, because the length of the respective free edges 60 in their closed configuration is greater than the distance between projections 50 of the frame 46, the free edges 60 can bend, or charge sharply and arbitrarily, as the free edges 60 pass between the projections 50, and this warp is propagated down to the middle of each leaflet 44, causing high localized folding stresses that can ultimately lead to the formation of tears 62 in the middle of the leaflets 44.
[00315] Figure 4 shows a first modality of a synthetic polymeric heart valve in general called 102 that aims to overcome or alleviate some of the problems presented with known synthetic polymeric heart valves. The synthetic polymeric heart valve 102 comprises three relatively flexible polyurethane leaflets 104 attached to a relatively rigid stainless steel frame 106. Leaflets 104 are flexible in relation to frame 106, but are generally formed of a more durable, more rigid polyurethane material than used for polymeric leaflets of known synthetic polymeric heart valves 22, 42.
[00316] As shown in figure 5 (a), the frame 106 comprises a base portion in the annular general 108 defining an opening 109 and three pillar portions 110 extending from the base portion 108 in a general longitudinal direction. Each leaflet 104 is attached to the base portion 108 of the frame 106 along a corresponding attachment base line 112. Each leaflet 104 is attached between two adjacent pillar portions 110 of the frame 106 along the respective attachment lines 114. The attachment lines 114 are generally straight and extend in a longitudinal direction perpendicular to the base. Each leaflet 104 has a free edge 115 that extends between two adjacent pillar portions 110 of the frame 106 opposite the attachment baseline 112. The free border 115 of each leaflet is free to move relative to frame 106 in response to differences pressure on either side of the leaflets 104.
[00317] Figure 5 (b) shows a contour map of the leaflets 104 in its natural configuration or in the manner formed in which contour numbers 1 - 11 represent contours of constant height increasing with the distance of the base portion 108 of the frame 106 , such that contour number 1 represents the attachment baseline 112 of a leaflet 104 and contour number 11 represents a lower contour 116 of a vertical coaptation region 117 extending from the free edge 115 of the leaflet to the lower contour 116 of the coaptation region 117. From figure 5 (b), therefore, it is apparent that a side section made through each leaflet comprises a joint in the form of an inflection point 118, an outward convex portion 119 extending of a first pillar portion 110 to the inflection point 118 and a concave outward portion 120 extending from a second pillar portion 110 to the inflection point 118 so that each section has an “S shape” when viewed in the direction of exit. In this way, each lateral cross section through each leaflet 104 is greater than the attachment baseline 112 of leaflet 104. In addition, the free edge 115 of each leaflet 104 is greater than the corresponding attachment baseline 112. Each leaflet 104 adopts a three-dimensional curved shape comprising an outer surface with a generally three-dimensional convex portion 121 on one side of each inflection point 118 and a generally three-dimensional concave portion 122 to the other side of each inflection point 118. Furthermore, since the attachment lines 114 of each leaflet 104 are straight in the vicinity of each pillar portion 110 of the frame 106, the contour numbers 1-11 shown in figure 5 (b) are found in the vicinity of each portion pillar 110 of frame 106. The inflection point 118 of each lateral cross section of a leaflet 104 between the attachment baseline 112 and the lower contour 116 of the coaptation region 117 is along a straight line 124 q it extends from an intersection point 126 of an attachment line 114 adjacent to the concave portion 122 of leaflet 104 with attachment base line 112 to the inflection point 118 at the midpoint of the lower contour 116 of the coaptation region 117.
[00318] As will be described in more detail below, a mold or former is used to define the shape of each leaflet 104 during its manufacture. Figure 9 shows a longitudinal cross section through a trainer like this showing the profile of a surface of the trainer on which a leaflet 104 conforms during its manufacture. In this way, each contour with a number 1 to 11 of the leaflets 104 is defined by a corresponding contour with a number 1 to 11 as indicated on the surface of the trainer in figure 9.
[00319] In use, the base portion 108 of frame 106 is engaged with a circumferential seam ring (not shown) through which surgical anchoring sutures pass to secure the artificial heart valve 102 in the valve attachment area (ring) natural heart disease that requires replacement. As shown in figure 6 (in which “LA” indicates the left atrium, “LV” indicates the left ventricle, and “Ao” indicates the aorta), the artificial valve 102 is oriented in such a way as to allow appropriate unidirectional blood flow through a heart 130, thus allowing it to be used to replace the aortic valve (ventriculo-arterial valve) and / or a mitral valve (atrio-ventricular valve).
[00320] When valve 102 is configured in the closed configuration denoted by “C” as shown in dashed lines in figure 7, the free edges 115 of flexible leaflets 104 and the internal surfaces of the coaptation regions 117 of leaflets 104 engage with each other in order to reduce or prevent blood flow through valve 102. When the pressure exerted on the flexible leaflets 104 on the inlet side sufficiently exceeds that exerted on the outlet side (as occurs at the beginning of blood ejection) the leaflets 104 move out of such that the free edges 115 adopt an open configuration denoted by “O” in figure 7 to create an exit orifice 132, the maximum size of which can be varied by the S-shape design that determines the length of the free edge of the booklet 115. In figure 7, the contour numbers 3, 5, 7 and 9 represent contours of constant height of a leaflet 104 in the open “O” configuration. As will be described in more detail below, the free edges 115 of the leaflets 104 are formed with a configuration denoted by "F" which is intermediate to the closed configuration denoted by "C" and the open configuration denoted by "O".
[00321] The design of valve 102 allows the use of more rigid and more durable biocompatible materials for leaflets 104 in order to provide a low blood flow restriction in the open “O” configuration compared to conventional synthetic polymer heart valves made of such more rigid materials, while also reducing the susceptibility to tearing of the leaflets 104. This greater immunity to damage is attributable not only to the greater stiffness of the leaflets 104, but also to the inflection point defined along a lateral section through each leaflet 104. More specifically, the rigidity and arrangement of each leaflet 104 means that although the curvature of each leaflet 104 at an inflection point 118 and / or the curvature of each leaflet 104 anywhere on an inflection point 118 may change in response to changes in the pressure differential across leaflets 104, the generally three-dimensional convex and concave portions 121, 122 of leaflets 104 in general persist to different pressure differentials through the leaflets 104. As a result of this movement, stresses in the leaflets 104 are distributed across the widths of the leaflets 104 and the commissural regions of the leaflets 104 in the vicinity of the frame 106 do not have to bend as much as the commissural regions of the leaflets of conventional synthetic heart valves (such as the leaflets 44 shown in figures 3 (c) to 3 (e)) for a given size of the outlet port.
[00322] The rigidity and arrangement of each leaflet 104 also means that each leaflet 104 has a predetermined shape for a given pressure differential through leaflet 104. The predetermined shape of each leaflet 104 for a given pressure differential through leaflet 104 it is selected in such a way as to prevent arbitrary warping or wrinkling of each leaflet 104, thereby avoiding excessive folding stresses in each leaflet 104. In particular, each leaflet 104 is formed so as to have a predetermined shape through movement between open and closed configurations.
[00323] With reference to figure 7, as each leaflet 104 moves from its closed configuration “C” to its corresponding open configuration “O” between two adjacent pillar portions 110, the generally two-dimensional convex and concave portions 121, 122 of leaflet 104 oscillate or pivot around their respective attachment lines 114. The curvature of the convex and concave portions 119, 120 of the free edge 115 of leaflet 104 are accentuated until the point of inflection 118 along the free edge 115 crosses a straight line extending between adjacent pillar portions 110. Since the inflection point 118 along the free edge 115 crosses the straight line extending between adjacent pillar portions 110, the curvature of the convex portion 119 of the free edge decreases while the curvature of the concave portion 120 of the free edge increases and the overall three-dimensional convex portion 121 of leaflet 104 appears to grow at the expense of the overall three-dimensional concave portion 122 of leaflet 104 until each leaflet 104 move to reach its corresponding open “O” configuration. Corresponding changes are observed for each lateral cross section of the leaflets 104 defined by contours 1 - 11. Changes in curvature are also accompanied by the movement of the inflection points 118 along the lateral cross sections of the leaflets 104 to accommodate changes in the curvature of the convex portions. and concave 121, 122 of the leaflets 104. This causes each leaflet 104 to move continuously in a predictable manner such that the convex portion 121 of the outer surface of each leaflet 104 appears to grow at the expense of the concave portion 122 of the outer surface of the leaflet. 104 when viewed from the outlet side of valve 102. As a result of such movement, warping or wrinkling of each leaflet 104 and the associated folding stresses can be avoided. This allows valve 102 to be configured in such a way that the bending stresses induced in each leaflet 104 as a result of such movement of each leaflet 104 does not exceed a threshold of bending stress so that damage such as tearing of each leaflet 104 is that way avoided.
[00324] The leaflets 104 of the three leaflets heart valve 102 are configured to define a lateral cross-section that provides a counterclockwise spiral blood flow when viewed from the outlet side of the valve 102. A lateral cross-section made through each leaflet 104 defines a convex outward portion 119 followed by a concave outward portion 120 generally counterclockwise about an axis defined by opening 109 when viewed from the outlet side of valve 102. In use, when implanted in a the heart of a human or animal individual, a spiral blood flow like this can improve the efficiency of the heart's operation compared to the efficiency of the heart when using known artificial heart valves.
[00325] The design of the synthetic heart valve 102 represents a significant abandonment of the design of a natural heart valve that evolved naturally over millions of years and that works well for a lifetime, but that counts for this with the physical and biological characteristics of complex leaflet structure, composed of collagen, elastin and glycoprotein matrix, as well as the living nature of the tissue that is able to repair or replace itself. In addition, the design principles for the synthetic heart valve 102 are contrary to the design principles employed for conventional man-made heart valve designs that dictate that such conventional man-made heart valve designs should mimic natural heart valve designs. In particular, the design of the synthetic heart valve 102 differs considerably from conventional man-made heart valve designs that mimic natural heart valve designs at least on the straight attachment lines 114 along which each leaflet 104 is connected to the pillar portions 110 of frame 106. In addition, each lateral cross section through each leaflet 104 defines convex and concave portions 119, 120 and an inflection point 118 between the convex and concave portions 119, 120. An additional distinctive feature of synthetic heart valve 102 is that each lateral cross section through each leaflet 104 and the free edge of each leaflet 104 are both larger than the attachment baseline 112 of each leaflet 104.
[00326] Figure 8 illustrates the manufacture of heart valve 102 using an immersion molding process in which frame 106 is properly positioned in a former 140, immersed in a polyurethane solution and left to dry in an oven. The configuration of the former 140 dictates the configuration of the valve leaflets 104 upon formation. The configuration of the free edges 115 of the leaflets 104 by formation is denoted by “F” in figure 7. In the absence of any pressure differential through the leaflets 104, the leaflets 104 tend to return to the configuration of the valve leaflets 104 by formation and, in particular, the free edges 115 of the leaflets 104 tend to revert to the configuration denoted by "F". This is a consequence of the properties of the material from which the leaflets are formed and is, in particular, a result of stresses induced in the material of the leaflets 104 as the leaflets 104 move out of their standard formation or configuration. In addition, the standard configuration of booklets 104 is deliberately designed in such a way that the free edges 115 of booklets 104 are not so separated that they cannot move from their standard “F” configuration to their closed “C” configuration. in order to prevent blood flow in a backward direction through valve 102 in response to an appropriate pressure differential. In addition, the standard configuration is deliberately designed in such a way that the free edges 115 of the leaflets 104 can easily move from their standard “F” configuration to their open “O” configuration in order to minimize blood flow restriction in a direction to forward through valve 102 in response to an appropriate pressure differential.
[00327] Figure 9 shows trainer 140 before mounting frame 106 on trainer 140. Trainer 140 is made of stainless steel and comprises a threaded attachment portion 142 for attachment to a support element (not shown) and a portion body 144 with a highly polished surface 146 to release the artificial heart valve 102 from trainer 140 after the polyurethane solution has dried. A centrally located through hole 148 extends longitudinally through the former 140. The through hole 148 is configured to receive a closing pin 150 with a stem portion 152 and head portion 154. The stem portion 152 of the closing pin 150 serves to hide the through hole 148 in order to prevent the entry of polyurethane solution during immersion molding in the through hole 148. The head portion 154 of the closing pin 150 serves to maintain a region around an opening 155 of the through hole 148 formed in the attachment portion 142 of the former 140 largely free of the polyurethane solution. The former 140 comprises a locating hole 156 configured for aligning and attaching the frame 106 to the former 140 using a locating pin (not shown) to prevent relative movement between them during the immersion molding process. This ensures that each side edge 158 of the former is aligned adjacent a corresponding pillar portion 110 of the frame 106.
[00328] After immersion molding, the occlusion and location pins 154, 156 are removed from trainer 140. Subsequently, the release of artificial heart valve 102 from trainer 140 can be aided by injecting a release fluid such as water or saline into the opening 155 of the through hole in order to induce planar separation of the leaflets 104 from the highly polished surface 146 of the body portion 144 of the trainer 140. It should be understood that the trainer is immersed in the polyurethane solution in such a way that the polyurethane solution solidifies to one level above the lower contours 116 of the coaptation regions 117 defined by the contour 11 in the former 140. The leaflets 104 can subsequently be trimmed at a level above the contour 11 in order to form the free edges 115 and define a height of the coaptation regions 117 from the lower contours 116 of the coaptation regions 117 to the free edges 115.
[00329] The immersion molding process allows the polymer to wrap around frame 106 including base portion 108, as shown in figure 10 (a) and pass through slits 160 in the pillar portions 110 of frame 106, as shown in figure 10 (b), in order to completely wrap the frame 106 and ensure integral formation of the leaflets 104 and secure attachment of the leaflets 104 to the frame 106. A manufacturing process like this can guarantee the integral formation and secure attachment of the leaflets 104 to the frame 106 covering the frame 106 with a continuous sheet of polyurethane. This has the advantage that the attachment of the leaflet is not limited to the adhesion of the polyurethane to one or more portions of the frame 106, thus reducing the risk of the leaves 104 detaching from the frame 106. In addition, the slits 160 are angled in a way ensuring that leaflets 104 enter and / or exit slots 160 in a predetermined configuration. Such an angle can, in particular, ensure that the curvature of a lateral cross section of the leaflets 104 in the vicinity of the pillar portions 110 is continuous with a curvature of the convex and concave portions 119, 120 of the lateral cross section of the leaflets 104.
[00330] Figure 11 shows a second embodiment of a synthetic polymeric heart valve in general designated 202 comprising two flexible leaflets 204 attached to a frame 206 along the two generally straight attachment lines defined by the respective pillar portions 210 extending of a base portion 208 that defines an opening for blood flow. Each leaflet 204 is attached to the base portion 208 of the frame 206 along an attachment baseline 212. Each leaflet 204 extends along a blood flow direction to a free edge 215 that is movable in a closed configuration denoted by “C” in figure 11 for an open configuration denoted by “O” and shown in dashed lines in figure 11. Leaflets 204 of bifoldlet heart valve 202 are configured to define a lateral cross section that provides a clockwise spiral blood flow when viewed from the outlet side of valve 202. A lateral cross section through each leaflet 204 defines an outwardly concave portion followed by an outwardly convex portion generally counterclockwise about an axis defined by the base portion 208 when viewed from the outlet side of the valve. In other respects, the two-leaf heart valve 202 is designed using the same design principles as previously outlined for the three-leaf synthetic polymeric heart valve 102 and operates in a similar manner.
[00331] Those skilled in the art will understand that various modifications can be made in the modalities presented without departing from the scope of the present invention. For example, figure 12 (a) shows a perspective view of a first alternative frame 306 for the synthetic polymer leaflet valve of figure 4 comprising a base portion 308 and a plurality of through holes 370 extending through the portion of base 308. Figure 12 (b) is a cross section of the frame of figure 12 (a) in a longitudinal plane in the vicinity of the base portion 308 showing a leaflet 304 extending through a through hole 170 and surrounding the portion of base 308. Each of the through holes 370 is angled upwards approximately 30 ° with the horizontal to ensure that a curvature of the leaflet 304 adjacent to the base portion 308 is continuous with a curvature of convex and concave portions 321, 322 of the leaflets 304.
[00332] Figure 13 (a) shows a perspective view of a second alternative frame 406 for the synthetic polymer leaflet valve of Figure 4 comprising a base portion 408 and a plurality of slots 480, each slot 480 extending through of the base portion 408. Figure 13 (b) is a cross section of the frame of figure 13 (a) in a longitudinal plane in the vicinity of the base portion 408 showing a leaflet 404 extending through a slit 480 and surrounding the base portion 408. Each of the slots 480 is angled upwards approximately 30 ° with the horizontal to ensure that a curvature of the leaflet 404 adjacent to the base portion 408 is continuous with a curvature of convex and concave portions 421, 422 of 404 brochures.
[00333] In additional alternative frames (not shown) for the synthetic polymer leaflet valve of figure 4, instead of having slots for attaching the leaflets to the pillar portions of the frame along the generally straight attachment lines, pillar portions can each define a plurality of through holes aligned along the pillar portions for attaching leaflets along generally straight attachment lines.
[00334] Instead of being rigid or semi-rigid, frame 106 can be flexible. For example, the frame 106 can be expandable to allow valve 102, 202 to expand with the natural growth of a growing individual, such as a child, or to be expanded forcefully by a balloon or other method, without taking the leaflets from valve 104, 204 incompetent and leaking. Juxtaposition of the leaflets 104, 204 in the coaptation regions 117, 217 is maintained by changing the curvature of the leaflets as the pillar portions 110, 210 separate with the widening of the valve 102, 202.
[00335] It should be understood that, in some modalities, one or more leaflets can be configured to define a lateral cross section that provides a spiral blood flow in a counterclockwise direction when viewed from an outlet side of the valve. A lateral cross section through each leaflet can define an outward convex portion followed by a generally outwardly concave portion counterclockwise about an axis defined by the opening when viewed from the outlet side of the valve. For example, the three-ply heart valve 102 shown in Figures 4, 5 (b), 7 and 8 is configured in such a way that the pockets 104 define a lateral cross section that provides a counterclockwise spiral blood flow when viewed through the outlet side of valve 102.
[00336] In other modalities, one or more leaflets can be configured to define a lateral cross section that provides a spiral blood flow in a clockwise direction when viewed from the valve outlet side. A lateral cross section through each leaflet can define a concave outward portion followed by a convex outward portion generally in a counterclockwise direction around the axis defined by the opening when viewed from the outlet side of the valve. For example, the two-leaflet heart valve 202 of figure 11 is configured in such a way that the leaflets 204 define a lateral cross-section that provides a clockwise spiral blood flow when viewed from the outlet side of valve 202. Similarly, the figures 14 (a) and 14 (b) show a three-leaflet heart valve 302 that is configured in such a way that the leaflets 304 define a lateral cross section that provides a clockwise spiral blood flow when viewed from the outlet side of valve 302 .
[00337] Referring to figure 15 (a), there is shown a schematic perspective view illustrating the assembly of a frame 406 of an artificial heart valve and an attachment ring designated in general by 500. Referring to figures 15 ( a) and 15 (b), the attachment ring 500 comprises an annular base portion 502 that defines three female engaging features in the form of three receptacles 504 that are circumferentially distributed around the base portion 502. As shown most clearly in cross sectional view through the base portion 502 of figure 15 (c), the base portion 502 comprises an annular support structure 506 surrounded by a resiliently deformable cover material in the form of a Dacron layer 508. In use, a suture of run 510 is used to sew base portion 502 in a passage (not shown) within the heart of a human or animal subject by looping a continuous suture length repeatedly around base portion 502. The Dacro layer No. 508 is then compressed against an inner surface of the passageway (not shown) to provide a seal with it around an outer surface of the base portion 502. Suture 510 sinks into the Dacron layer 508 in order to avoid interference with the seal between the outer surface of the base portion 502 and the inner surface of the passageway (not shown) and in order to avoid interference with a subsequent seal formed between an inner surface of the base portion 502 and an outer surface of an annular base portion 408 of the frame 406. Such a sewing method may allow the use of an annealing ring 500 with an annular base portion 502 that has a radial extent that is substantially less than the radial extent of known sewing rings. This may allow the use of artificial heart valves that define larger openings of blood flow.
[00338] As shown in figure 15 (d), each receptacle 504 comprises a recess 512 and a resiliently deformable element 514 that extends downwards and through recess 512. The recess 512 has a generally rectangular cross section. The artificial heart valve frame 406 comprises three rigid male engagement features in the form of three bayonets 516, each with corresponding leg and foot portions 518, 520. Each bayonet 516 has a generally rectangular cross section that is configured to be received inside a corresponding recess 512. During assembly, each bayonet 516 is aligned and pushed into a corresponding recess 512 so that the foot portion 520 of the bayonet first engages and then deforms a corresponding deformable element 514. When the foot portion 520 is pushed into the recess 512, the foot portion 520 engages a closed end 522 of the recess 512, thus allowing a lower end 524 of the deformable element 514 to resiliently return to its natural position and thereby lock the corresponding bayonet 516 in engagement inside the recess 512. A pressure coupling arrangement like this can simplify the attachment of frame 406 to a heart valve artificial in a passage (not shown) inside the heart of a human or animal individual.

权利要求:
Claims (24)
[0001]
1. Artificial heart valve (102), characterized by the fact that it comprises a support structure (106) defining an opening (109) for blood flow and a flexible leaflet (104) that is movable in relation to the support structure (106) between an open configuration, in which the leaflet (104) allows blood flow through the opening (109), and a closed configuration, in which the leaflet (104) restricts blood flow through the opening (109), in which the opening (109 ) defines an axis and a lateral cross section made through the leaflet (104) in a plane lateral to the axis defines an outward convex portion (119), an outward concave portion (120) and a junction (118) between the convex portions and concave (119, 120) when the leaflet (104) is in the open and closed configurations and all leaflet configurations intermediate the open and closed configurations including a natural or standard configuration, in which the leaflet (104) is formed, and in that the leaflet (104) is attached to the structure d and support (106) along the first and second attachment lines at least partially straight (114), such that movement of the leaflet (104) between the open and closed configurations causes the convex portion (119) of the cross section lateral pivot around one of the first and second attachment lines (114) and the concave portion (120) of the lateral pivot cross section around the other of the first and second attachment lines (114).
[0002]
2. Artificial heart valve (102) according to claim 1, characterized by the fact that the first and second attachment lines (114) extend in a direction that is generally parallel to the axis.
[0003]
Artificial heart valve (102) according to claim 1 or 2, characterized by the fact that the convex portion (119) extends from one of the first and second attachment lines (114) to the junction and the concave portion (120) extends from the other of the first and second attachment lines (114) to the junction (118).
[0004]
4. Artificial heart valve (102) according to any of the preceding claims, characterized by the fact that the heart valve (102) is configured in such a way that movement of the leaflet (104) out of the closed configuration to the open configuration results in a reduction in curvature of the convex portion (119) of the lateral cross section and an increase in curvature of the concave portion (120) of the lateral cross section.
[0005]
5. Artificial heart valve (102) according to any one of the preceding claims, characterized by the fact that the heart valve (102) is configured in such a way that movement of the leaflet (104) from the closed configuration to the open configuration results in an increase initial curvature of the convex and concave portions (119, 120) of the lateral cross section of the leaflet (104) followed by a decrease in the curvature of the convex portion (119) and an additional increase in the curvature of the concave portion (120).
[0006]
6. Artificial heart valve (102) according to any one of the preceding claims, characterized by the fact that the heart valve (102) is configured in such a way that movement of the leaflet (104) out of the closed configuration to the open configuration results in movement of the junction (118) along the lateral cross section of the leaflet (104) out of the first or second attachment line (114) around which the convex portion (119) pivots towards the other of the first and second lines of attachment annexation (114) around which the concave portion (120) pivots.
[0007]
7. Artificial heart valve (102) according to any one of the preceding claims, characterized by the fact that the heart valve (102) is configured in such a way that movement of the leaflet (104) from the closed configuration to the open configuration results in no movement of the joint (118) along the lateral cross section of the leaflet (104) followed by the movement of the joint (118) along the lateral cross section of the leaflet (104) of the first or second attachment line (114) around which the convex portion (119) pivots towards the other of the first and second attachment lines (114) around which the concave portion (120) pivots.
[0008]
8. Artificial heart valve (102) according to any one of the preceding claims, characterized by the fact that a length of the convex portion (119) of the lateral cross section comprises a greater proportion of a total length of the lateral cross section in the open configuration than in the closed configuration.
[0009]
9. Artificial heart valve (102) according to any of the preceding claims, characterized by the fact that the leaflet (104) is attached to the support structure (106) along an attachment baseline (112), which it is adjacent to the opening (109).
[0010]
Artificial heart valve (102) according to claim 9, characterized by the fact that the attachment baseline (112) is convex outward and / or the attachment baseline (112) extends circumferentially at least part around the opening (109).
[0011]
11. Artificial heart valve (102) according to claim 9 or 10, characterized by the fact that the leaflet (104) comprises a free edge (115) that extends opposite the attachment baseline (112) between the first and second attachment lines (114), the free edge (115) being movable in relation to the support structure (106), and the free edge (115) defining an outward convex portion (119), an outward concave portion (120) and a junction (118) between the convex and concave portions (119, 120).
[0012]
12. Artificial heart valve (102) according to claim 11, characterized by the fact that the free edge (115) of the leaflet (104) is greater than the attachment baseline (112).
[0013]
13. Artificial heart valve (102) according to claim 11 or 12, characterized by the fact that each of a plurality of lateral cross sections made through the leaflet (104) between the attachment baseline (112) and the edge free (115) defines an outward convex portion (119), an outward concave portion (120) and a junction (118) between the convex and concave portions (119, 120).
[0014]
14. Artificial heart valve (102) according to any of claims 11 to 13, characterized by the fact that the leaflet (104) defines a coaptation region (117) extending from the free edge (115) to a contour (116) ) which is located between the free edge (115) and the attachment baseline (112), the coaptation region (117) defining a plurality of generally identical side cross sections, and in which the leaflet (104) defines first and second lateral cross sections between the attachment baseline (112) and the contour (116) of the coaptation region (117) with the first lateral cross section located closer to the attachment baseline (112) than the second lateral cross section, in which each of the first and second lateral cross sections defines a convex portion (119) and a concave portion (120), and in which the convex portion (119) of the first lateral cross section is larger than the convex portion (119) of the second lateral cross section and the concave portion (120) of the first lateral cross section is smaller than the concave portion (120) of the second lateral cross section.
[0015]
15. Artificial heart valve (102) according to any one of the preceding claims, characterized by the fact that the support structure (106) comprises a base portion (108) defining the opening (109) and first and second pillar portions ( 110) arranged around the opening (109) and extending from the base portion (108) in a direction that is generally parallel to the axis defined by the opening (109), and the leaflet (104) is attached to the first pillar portion (110) along the first attachment line (114), the second pillar portion (110) along the second attachment line (114) and the base portion (108) along an attachment base line ( 112).
[0016]
16. Artificial heart valve (102) according to claim 15, characterized by the fact that the leaflet (104) extends through and surrounds the first pillar portion (110) along the first attachment line (114) and the leaflet (104) extends through and wraps the second pillar portion (110) along the second attachment line (114).
[0017]
17. Artificial heart valve (102) according to claim 15 or 16, characterized by the fact that the leaflet (104) extends through and surrounds the base portion (108).
[0018]
18. Artificial heart valve (102) according to any one of the preceding claims, comprising one or more additional flexible leaflets (104), characterized by the fact that each one or more additional leaflets (104) is movable in relation to the structure of support (106) between an open configuration, in which the additional leaflet (104) allows blood flow through the opening (109), and a closed configuration, in which the additional leaflet (104) restricts blood flow through the opening (109) , in which a lateral cross section made through any one or more additional leaflets (104) in a plane lateral to the axis defines a corresponding outward convex portion (119), a corresponding outward concave portion (120) and a junction corresponding (118) between the convex and concave portions (119, 120) when said additional leaflet (104) is in the open and closed configurations and all the leaflet configurations intermediate the open and closed configurations including a natural or standard configuration in which the additional booklet (104) is formed, and in which each of the one or more additional booklets (104) is attached to the support structure (106) along the first and second attachment lines by less partially straight (114), such that movement of any one or more additional leaflets (104) between the corresponding open and closed configuration causes the convex portion (119) of the lateral cross section of the additional leaflet (104) pivot around one of the corresponding first and second attachment lines (114) and the concave portion (120) of the lateral cross section of the additional leaflet (104) pivot around the other of the corresponding first and second attachment lines (H4).
[0019]
19. Artificial heart valve (102) according to claim 18, characterized by the fact that a curvature of the convex portion (119) of the lateral cross section of the leaflet (104) is substantially matched to a curvature of the concave portion (120) of the section lateral cross-section of one or more additional leaflets (104) adjacent to the leaflet (104), wherein said lateral cross sections are made through the leaflet (104) and the additional adjacent leaflet (104) in the same plane lateral to the axis.
[0020]
20. Artificial heart valve (102), characterized by the fact that it comprises a support structure (106; 306; 406) that defines an opening (109) for blood flow and one or more through holes (160; 370; 480); and a leaflet material integrally formed around the support structure (106; 306; 406) in order to define a flexible leaflet (104), in which the leaflet material extends through one or more through holes (160; 370 ; 480) and around a portion of the support structure (106; 306; 406), and wherein the flexible leaflet (104) extends from one or more through holes (160; 370; 480).
[0021]
21. Artificial heart valve (102) according to claim 20, characterized by the fact that at least one of the through holes (160; 480) is elongated and / or at least one of the through holes (160; 480) comprises a slot ( 160; 480).
[0022]
22. Artificial heart valve (102) according to claim 20 or 21, characterized by the fact that at least one of the through holes (160; 370; 480) is angled with respect to a defined radial direction relative to an axis defined by the opening (109).
[0023]
23. Artificial heart valve (102) according to any one of claims 20 to 22, characterized by the fact that at least one of the through holes (160) is defined in a pillar portion (110) of the support structure (106) and / or at least one of the through holes (370; 480) is defined in a base portion (308; 408) of the support structure (306; 406).
[0024]
24. Artificial heart valve (102), characterized by the fact that it comprises a support structure (106) defining an opening (109) for blood flow and a flexible leaflet (104) that is movable in relation to the support structure (106) between an open configuration, in which the leaflet (104) allows blood flow through the opening (109), and a closed configuration, in which the leaflet (104) restricts blood flow through the opening (109), in which the opening (109 ) defines an axis and a lateral cross section made through the leaflet (104) in a plane lateral to the axis defines an outward convex portion (119), an outward concave portion (120) and a junction (118) between the convex portions and concave (119, 120), where the leaflet (104) is attached to the support structure (106) along the first and second attachment lines at least partially straight (114), in such a way that movement of the leaflet (104 ) between the open and closed configurations make the convex portion (119) d the lateral cross section pivot around one of the first and second attachment lines (114) and the concave portion (120) of the lateral pivot cross section around the other of the first and second attachment lines (114), and in which the leaflet (114) is attached to the support structure (106) along the attachment baseline (112) which is adjacent to the opening (119) and which is convex outward and / or extending circumferentially at least in part in around the opening (109).

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ES2678318T3|2018-08-10|

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ZA201305801B|2014-05-28|

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GB2488530A|2012-09-05|

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EP2979666B1|2017-05-17|

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EP2979665B1|2018-04-18|

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法律状态:
2018-03-13| B25A| Requested transfer of rights approved|Owner name: THE DAVID J. WHEATLEY DISCRETIONARY TRUST (GB) |

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2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

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2019-11-05| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

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2020-07-07| B09A| Decision: intention to grant|

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2020-09-29| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 17/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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GB1102828.9A|GB2488530A|2011-02-18|2011-02-18|Heart valve|

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GB1102828.9|2011-02-18|

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PCT/GB2012/000165|WO2012110767A2|2011-02-18|2012-02-17|Heart valve|

---