• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 优先权
    • 专利摘要:
    device for ejecting a liquid or pasty product. the invention relates to a device for ejecting a liquid or pasty product, including a body (2) having a recess (11) for receiving a product to be ejected, characterized in that it includes a threaded rod (3), which and translationally movable in order to act on the product to be ejected, a screw (5), which is mounted so as to engage with the threaded rod (3) the end of causing it to translationally move, and a lever (1 ) that acts on the screw (5) by means of a control means to cause its rotation.
    公开号:BR112012013865B1
    申请号:R112012013865-0
    申请日:2010-12-09
    公开日:2020-07-14
    发明作者:David Weill；Pierre-Yves Chassot
    申请人:Primequal Sa；
    IPC主号:
    专利说明:

    The invention relates to a device for ejecting a liquid or pasty product.
    A conventional and very simple device designed to eject a product, and used in particular in the fields of medicine and dentistry, takes the form of a straight and substantially cylindrical syringe comprising a front cartridge containing the product to be ejected and a cylindrical and plunger rectilinear rear, which is mobile in translation inside the cartridge. The operator simply pushes the piston, which slides inside the cartridge, ejecting the product through the front end of the cartridge on which a needle is mounted. The manufacture of such a syringe satisfies strict requirements regarding hygiene and sterility, especially with regard to the integration of the product in the cartridge. A disadvantage of this solution stems from the fact that such a syringe is difficult to handle, since pushing the piston is complicated and makes it impossible to control the ejection of a precise dose and eject the product at a controlled speed. This disadvantage makes it unsuitable for certain areas, such as cosmetic surgery that requires the ejection of small doses with great precision and the use of products that are sometimes thick or even pasty, such as hyaluronic acid, which require strength considerable ejection.
    Document W02008 / 107813 proposes an ejection device that is of a simpler design and that is easy to dismantle and clean. This device comprises a body, a part that is intended to contain the product and is provided with a product eject hole, a toothed pusher cylinder, of the ratchet type, traveling through a hole in the body and varying the volume of the part intended for contain the product, and a mechanism for moving the pusher cylinder connected to the body, comprising a detachable pivoting lever that acts on the teeth of the pusher cylinder by means of a tongue connected to the lever. This solution has the advantage of great simplicity and better control of the ejected dose. A minimum ejected dose corresponds to the distance that separates two teeth from the pusher cylinder. Such a project reaches its limit when very small doses are needed. This is because a pusher cylinder according to this design generally cannot have more than fifty or more teeth along the length of the impulse used, which proves to be inadequate, especially in plastic surgery and in certain dental applications. In addition, increasing the number of teeth requires reducing their size, which means that the teeth have less control and the ejection device is less reliable.
    Thus, a general object of the invention is to provide a solution to eject a liquid or pasty product that overcomes the disadvantages of existing solutions.
    More specifically, a first object of the invention is to provide a solution for ejecting a liquid or pasty product, through which the ejected dose can be controlled with great precision.
    A second object of the invention is to provide a solution to eject a liquid or pasty product offering a maximum degree of hygiene.
    A third object of the invention is to provide a simple and economical solution for ejecting a liquid or pasty product.
    To this end, the invention is based on a device for ejecting a liquid or pasty product, comprising a body having a recess to receive a product to be ejected, characterized by the fact that it comprises a threaded rod, which is mobile in translation in order to act on the product to be ejected, a screw, which is mounted in coupling with the threaded rod, the end to cause the latter to move in translation, and a lever, which acts on the screw by means of control to cause it to rotate.
    The control means may comprise a tongue connected to the lever.
    The lever can be mounted for rotation or flexion on an axis arranged at its rear. This axis may also be located at its rear end and may comprise a means for fixing this axis movably on the body of the ejection device.
    The lever and the tongue can form the same molded plastic component.
    The screw may comprise teeth or coupling grooves, directly or indirectly with the tongue, these teeth or grooves being arranged on the outer peripheral surface of the same, the profile of the teeth extending in a vertical transverse plane and / or in a longitudinal plane vertical.
    The tongue may be in the form of an axis connected to the lever at a first end, forming an elastically or non-elasticly movable axis, and may comprise a second end capable of interacting with the teeth of a ratchet, comprising a rectangular end and / or one or more teeth with respect to that second end, or a second end comprising a rounded part capable of interacting with a groove.
    The ejection device may comprise a ratchet mounted in rotation on the threaded rod and comprising several teeth that are arranged on the same external peripheral surface and of which the profile extends in a vertical transverse plane, the end of coupling with the tongue, and comprising at least one tooth oriented in the longitudinal direction, the end of coupling with the screw so as to drive the last one in rotation during the activation of the lever.
    The teeth of the screw or ratchet may have a pointed profile and be asymmetrical or have a symmetrical rectangular, conical or trapezoidal profile.
    The means for controlling the screw may comprise one or more intermediate gears for decelerating the transmission of rotation speed to the screw.
    The screw may comprise an alternating sequence of inclined grooves and longitudinal grooves formed on the external cylindrical surface thereof.
    The ejection device may comprise a tongue connected to the lever, one end of which engages with the screw grooves, and / or it may comprise, at its end, a drive element comprising several engagement coupling elements with the grooves of the screw, in order to make the screw turn when the lever is activated.
    The ejection device may also comprise a non-return device comprising an elastic blade or one or more teeth attached to the device body and coupled with the screw, in order to form a non-return device for the screw, preventing rotation reverse of the same when the lever is released.
    The non-return device may comprise a cylindrical component formed in the area of the hole in which the threaded rod moves, comprising teeth that extend in the longitudinal direction at one of its ends and that come into coupling with at least one complementary tooth extending in the longitudinal direction of the screw.
    The ejection device may comprise a means for making an audible click when a minimum dose is ejected by operating the lever.
    The ejection device may comprise a body comprising a front part, containing the product to be ejected, and a separate rear part, which contains the screw.
    Finally, it can comprise at least one tool holder disposed on the front of the ejection device body and / or a tool holder disposed on the front of the ejection device body and a Luer lock type locking means to lock the tool holder on the ejection device.
    These objects, characteristics and advantages, and others, of the present invention are defined in detail in the following description of the particular modalities that are given as non-limiting examples and with reference to the attached figures, in which:
    Figure 1 shows a partial perspective view of an ejection device according to a first embodiment of the invention.
    Figure 2 shows a partial front view of the ejection device according to the first embodiment of the invention.
    Figure 3 shows a partial perspective view of an ejection device according to a first variant of the first embodiment of the invention.
    Figure 4 shows a partial front view of the ejection device according to the first variant of the first embodiment of the invention.
    Figure 5 shows a perspective view from a first side of the device's ejection mechanism according to the first variant of the first embodiment of the invention.
    Figure 6 shows a perspective view from the second side of the device's ejection mechanism according to the first variant of the first embodiment of the invention.
    Figure 7 shows a partial perspective view of an ejection device according to a second variant of the first embodiment of the invention.
    Figure 8 shows a perspective view from a first side of the device's ejection mechanism according to the second variant of the first embodiment of the invention.
    Figure 9 shows a perspective view from the second side of the device's ejection mechanism according to the second variant of the first embodiment of the invention.
    Figure 10 shows a partial perspective view of an ejection device according to a second embodiment of the invention.
    Figure 11 shows a side view of the ejection mechanism of the device according to the second embodiment of the invention.
    Figure 12 shows a perspective view from a first side of the ejection mechanism of the device according to the second embodiment of the invention.
    Figure 13 shows a perspective view from the second side of the device's ejection mechanism according to the second embodiment of the invention.
    Figure 14 shows a perspective view of the drive mechanism of an ejection device according to a third embodiment of the invention.
    Figure 15 shows a perspective view of the drive mechanism of an ejection device according to a first variant of the third embodiment of the invention.
    Figure 16 shows a perspective view of the drive mechanism of an ejection device according to a second variant of the third embodiment of the invention.
    Figure 17 shows a perspective view of the drive mechanism of an ejection device according to a fourth embodiment of the invention.
    Figure 18 shows a cross-sectional side view of the fourth embodiment of the invention.
    Figure 19 shows a perspective view of the drive mechanism of an ejection device according to a variant of the fourth embodiment of the invention.
    Figure 20 shows a partial perspective view of an ejection device according to the invention comprising a first embodiment of a non-return device.
    Figure 21 shows an enlarged perspective view of details of this non-return device.
    Figure 22 shows a perspective view of the drive mechanism of an ejection device according to the invention comprising a second embodiment of an anti-return device.
    Figure 23 shows a partial rear perspective view of the ejection device according to the invention comprising the second embodiment of a non-return device.
    Figure 24 shows an enlarged perspective view of details of this non-return device.
    Figure 25 shows a partial side view of the ejection device comprising the second embodiment of a non-return device.
    Figure 26 shows a partial front perspective view of the ejection device according to the invention comprising the second embodiment of a non-return device.
    Figure 27 shows an enlarged front view in perspective of details of the ejection device comprising the second embodiment of a non-return device.
    In the following description, x designates the longitudinal axis that extends from the rear of the ejection device to the front of it, the front being the end where the product is ejected, z designates the vertical perpendicular axis to the x axis and passing through from the middle of the lever, y designates the axis perpendicular to the two previous axes X and Z, as shown in the figures.
    The modalities of the invention will be described in the context of an ejection device serving as a syringe designed for the dental field, for example, for injection of a product for the gums, or for cosmetic surgery, for example, for injection of a thick gel under the skin. However, the invention can be exploited in other fields for any ejection of a product in the form of a liquid, gel or paste, for example a glue.
    For simplicity, the ejection device is shown in part, in most of the figures, in order to better illustrate the driving mechanism to which the invention refers. In addition, components that are similar and have equivalent functions are designated by the same reference sign in the various figures corresponding to different modalities, despite the fact that their shape may vary.
    The concept of the invention lies in the combination of the use of an advantageous lever, with an impeller mechanism based on a threaded rod and a screw. The pressure on the lever allows the movement of the threaded rod, based on a very simple and reliable control means, as will be described below.
    In the preferred embodiments of the invention which are described below, the ejection device consists of a main body obtained by assembling separate components, which are advantageously manufactured by plastic injection molding. This main body comprises a front part 2a, which is connected to a rear part 2b by a lateral connection means 9. The front part 2a acts as a "container vessel" of the device body, which means that it comprises a volume of storage 11 of the product to be ejected, while the rear part 2b contains the mechanism that allows the ejection of the product, which will be explained below. The front part 2a can either directly form a volume containing the product to be ejected or it can have a location for receiving a separate cartridge, which comprises the product to be ejected. The ejection device also comprises, at its front, a tool holder 12 for receiving a needle (not shown). In most of the figures, the body 2a, 2b is not shown, or shown in part, in order to provide a view of the internal mechanism. Alternatively, the device can directly comprise a front end forming the ejection tool, such as a pipette for ejecting glue, for example, instead of a separate tool holder.
    In addition, the ejection device may comprise a locking device (not shown) of the known and standardized type under the name "Luer lock", which is in the form of a ring fixed around the body of a cartridge in order to avoid the detachment of the needle. The reason is that the high pressures exerted on the product to eject it are transmitted to the front of the cartridge, and the risks of the tool holder being thrown forward at high speed like a dart.
    Figures 1 and 2 show a first embodiment of the invention, in which an ejection device comprises an ejection mechanism which mainly comprises a lever 1, a threaded rod 3, a screw 5, and a control means between the lever and the screw .
    As in all the modes shown, lever 1 is mounted to rotate on the body of the ejection device on a transverse axis 7 positioned at the front of the lever. It comprises an inclined part 32 extending from its rounded end forming its axis of rotation 7 to a substantially horizontal part 33 in its resting position for its actuation. It also comprises an elastic means 6 whose function, like a spring, is to return the lever to its upper resting position. For this purpose, the elastic medium 6 consists of two elastic sheets, of which one end is connected to the lever 1, and the other end has a side plane part 13 formed inside the device body, which comprises a notch in its part upper part for the passage of this elastic means 6 and of a tongue 4, of which the function is explained below. Alternatively, the elastic medium can have other geometries, for example, a single blade. In another variant, this function of the elastic return means can be performed by the tongue 4.
    The fixation of the lever on the body of the device can be fixed, and the lever could operate by simply flexing its inclined part 32, by virtue of its elasticity, in an equivalent and similar way to the effect obtained during its rotation. In such a case, the front axle 7 could, for example, be fixed in a position mounted on the body of the ejection device, with no possibility of rotation. To make things simpler, only the rotation movement of the lever will be considered in the rest of the description.
    A tongue 4 connects the lever 1 to the screw 5 and has the main function of a means to control the rotation of the screw 5 from the lever 1. It extends downwards into the body 2b, through the upper notch, from of the inclined part 32 of the lever 1. It is in the form of a rectangular blade, of which the flat rectangular face is oriented in the transverse direction y. Advantageously, the lever 1, the tongue 4 and the elastic medium 6 are obtained in a single plastic molding step, and these three components form only one piece, an integral unit. The flexibility of the plastic material and the shape of the connection between, on the one hand, the tongue and the lever and, on the other hand, between the elastic medium and the lever allows an elastic movement of the tongue and the elastic medium in relation to the lever. In all modalities, the lever can alternatively have other geometries and other types of articulation, without departing from the concept of the invention.
    The screw 5 is removably mounted in rotation around the threaded rod 3. It is fixedly positioned in the longitudinal direction in relation to the ejection device, the body of the present device having an internal pillar preventing any advance or retreat of the screw 5. The latter comprises teeth 8, on its outer peripheral surface, of which the cross section in a yz plane, visible in Figure 2, has points 38 formed by an asymmetric tooth profile formed by inclined parts 39 with a smooth inclination and substantially oriented parts 40 in a direction transverse to the longitudinal direction x. These teeth 8 of the screw 5 are coupled with the lower end of the tongue 4, which occupies a position in abutment between two pieces 39,40 of a tooth 8. Finally, the threaded rod 3 is fixed in rotation and free when translating into a hole central cylinder of the ejection device. It has a cylindrical shape, of which a piece 37 is truncated in order to prevent its rotation, by coupling with a correspondingly shaped hole.
    The rear part of the ejection device is obtained by prior assembly (not shown) of the threaded rod 3 and its screw 5 with the rear body 2b, by its insertion in the present rear body 2b, insofar as its position in which the front end 15 of the threaded rod is able to interact with the pusher piston 16 for the product to be ejected, as can be seen particularly in Figures 23 and 26. Likewise, there is another preliminary assembly step in which the movable lever 1 is attached to the rear body 2b. The lever 1 comprises an upper horizontal part 33 extending forward, and designed to be manipulated, then a downward sloping part 32 comprising a lower rear end in the form of an axis 7, which is positioned on a corresponding location of the rear body 2b. Thus, the axis of rotation 7 of the lever 1 is situated towards the rear end of the lever 1, and the tongue 4 extends from the inclined part 32 of the lever, as far as the teeth 8, which thus form a ratchet on the outer periphery of the screw 5. The upper horizontal part of the lever can thus be moved downwards by a rotation of the lever on the axis 7, thus, entering the tongue 4 that rests against the teeth 8 of the ratchet until the rotation of the screw 5.
    The function of the ejection device will now be explained. A user acts on the lever 1, pressing it downwards, causing it to rotate around its axis of rotation 7. This downward movement leads to the tongue 4, of which the lower end is positioned against a tooth 8 of screw 5, drives tooth 8 in its downward motion and thus drives screw 5 in rotation. Since the screw 5 is fixed in the longitudinal direction of the ejection device, its rotation causes the longitudinal movement to the front of the threaded rod 3, of which the thread engages with the thread of the screw 5, as can be seen in Figure 18. The advance of the threaded rod 3 allows, by coupling with a front piston 16, to exert a propelling force on the storage volume 11 of the product contained in the front body 2a of the device, causing its ejection. When the lever continues its downward movement towards the body of the ejection device, as far as its lowest position, the user releases the lever, which automatically returns to its upper position under the effect of elastic means 6. At the same time time, a non-return means 41, which will be discussed in detail below, prevents any rotation of the screw 5 in the opposite direction, thus avoiding any longitudinal movement behind the threaded rod 3.
    During the downward movement of the lever 1, the lower end of the tongue 4 rises, moving slightly out of its natural position, sliding along the inclined slope 39 of the next tooth 8 on the outer surface of the screw. The teeth 8 have a ramp shape, which promotes this sliding. At the end of the recoil movement of the tongue 4, it reaches point 38 of the next tooth before presenting itself again on the abutment formed by the next tooth 8, by an elastic effect of the plastic material used, which brings the tongue 4 of it returns to its original substantially vertical position as the lower end of the tongue passes that point of the next tooth.
    The spacing of the various teeth 8 of the screw 5 corresponds to the clearance of the lever 1, such that the tongue 4 optimally allows the activation of a single tooth for each activation of the lever 1. In the embodiment shown in Figure 1, the screw 5 comprises 6 teeth on its outer surface, allowing it to be rotated by one sixth of a turn on each lever actuation. Thus, six actuations of the lever are necessary to achieve a complete turn of the threaded rod 3 and, therefore, the longitudinal advance of the latter over a distance defined by a curve of its thread. This solution has the advantage of allowing control of a very small movement of the threaded rod on the actuation lever 1, thus making it possible to perfectly control the ejection of small doses of products. Of course, the screw can comprise a different number of teeth, depending on the required precision and the required force.
    Figures 3 to 9 show variants of the first embodiment, with a function similar to that described above, in which a tongue 4 connected to the lever 1 forms the rotation control means of the screw 5, which drives the threaded rod 3.
    Figures 3 to 6 show a first variant of the first embodiment of the invention, in which the tongue 4 comprises a tooth 14 for its lower end, in a way that it engages with the teeth 8 of the screw 5. With this variant, it is possible increase the coupling between the tongue 4 and the screw 5. This tooth 14 has a profile according to that of the screw 5, being asymmetrical, in order to promote the movement of the screw 5 in the ejection phase and not movement in the rising phase of the lever.
    Figures 7 to 9 show a second variant of the first embodiment, in which several teeth 14 are formed at the lower end of the tongue 4. During the downward actuation of lever 1, the different teeth 14 enter in successive or simultaneous coupling with teeth 8 of screw 5. This solution further strengthens the connection between tongue 4 and screw 5.
    Figures 10 to 12 show a second embodiment of the invention, in which two different parts, which are positioned around the threaded rod 3, are used to perform the functions of ratchet, on the one hand, and screw, on the other hand. The lever 1 still, in fact, comprises a tongue 4 comprising several teeth 14, which enter into coupling with a ratchet 10 constituted by a cylindrical part, which is movable in rotation around the threaded rod 3, and in which the inner cylindrical surface it simply slides on the outer surface of the threaded rod, while its outer cylindrical surface constitutes a ratchet coupled with the tongue 4. The ratchet 10, furthermore, comprises a second series of teeth 18, of which the points are oriented in the longitudinal direction and which cooperate with a corresponding tooth 17 of a separate screw 5.
    During the downward actuation of the lever 1, the tongue 4 pushes the ratchet 10 in rotation, due to the coupling of its respective teeth 8, 14, similarly to the first modality. However, ratchet 10 simply rotates by sliding on the outer surface of the threaded rod 3, without directly triggering the rotation of the latter. However, the ratchet 10 comprises complementary teeth 18, which come for coupling with at least one complementary tooth 17 formed on the screw 5 and positioned in contact with the ratchet 10 around the threaded rod 3. In this way, the rotation of the ratchet 10 in this direction of rotation it triggers the rotation of screw 5, which induces the movement of the threaded rod 3, as explained above.
    During the downward movement of the lever 1, a tooth 34 of the screw 5 engages with the teeth 43 of a non-return device 42, according to a function which will be explained in detail below. During this coupling, once the elastically deflected tooth 34 of the screws escapes from a tooth 43, it is suddenly in its initial resting position by means of an elastic effect and emits an audible click, and the user can say from this click that a tooth 43 has been passed, which corresponds to a certain precise dose of the ejected product. During the downward movement of the lever, one or more audible clicks may be emitted depending on the geometry of the teeth in question.
    When the lever rises again, the tongue 4 triggers the rotation of the ratchet 10 in the reverse direction around the threaded rod, but the same amplitude as the previous rotation. In this embodiment, the tongue 4 does not need to deflect elasticly during the upward movement of the lever, and this phase is thus facilitated. The shape of teeth 17, 18, screw 5 and ratchet 10, respectively, is such that the reverse rotation of the ratchet does not lead to rotation of the screw. This is because the tooth 17 of the screw, being formed on an elastic blade 19 of the screw 5, deflects elastically during the reverse rotation of the ratchet without leading the rotation of the screw.
    In this embodiment, the coupling between the tongue 4 and the ratchet 10 is obtained by teeth with a more symmetrical profile, since the ratchet is guided in both directions of rotation in a substantially equivalent manner. Thus, the profile of teeth 8, 14, tongue 4 and ratchet 10, respectively, can, for example, have a rectangular, conical or trapezoidal profile. This modality makes it possible to reduce the forces exerted on the tongue, which only has to deviate from its natural orientation during the upward movement of the lever. In this second embodiment, the means for controlling the screw 5 thus consist of a tongue 4 and a ratchet 10.
    Figure 14 illustrates a third embodiment of the invention, in which the means for controlling the screw 5 use an intermediate gear 20 in order to slow down the amplitude of rotation finally transmitted to the threaded rod 3. Thus, a tongue 4 has an end that it engages with a movable intermediate gear 20 rotating around a transverse axis 21. The teeth 28 of the present gear then engage with the teeth 8 which extend in the longitudinal direction of the screw 5. Through its rotation, the latter then transmits a translation movement to the threaded rod, as already explained above.
    Figure 15 illustrates a variant of this third modality, in which the tongue, at its end, has a flat part that extends in the longitudinal direction and that comprises several teeth 14, which are coupled to the teeth of the intermediate gear 20. This geometry allows the use of smaller teeth than before and the coupling of several teeth at the same time.
    Figure 16 illustrates a second variant of this third embodiment, in which a second intermediate gear 22 is used, which is integral with the first intermediate gear 20, is also movable in rotation about a transverse axis 21 and comprises a threaded surface which it engages with the teeth 8 of the screw, such teeth 8 are arranged on the outer peripheral cylindrical surface, but are inclined with respect to the longitudinal direction in order to engage with the thread of the intermediate gear 22.
    This third modality has the advantage of a greater improvement of the translation movement transmitted to the threaded rod 3 by the actuation of the lever 1 and allows the ejection of very small doses in each actuation. Thus, it is possible to achieve a number of lever movements of more than 100 for the ejection of the entire product, which is particularly advantageous for certain applications that require great precision, such as cosmetic surgery. Of course, many variations of this third embodiment are conceivable in that the means for controlling the screw comprise a tongue and one or more gears, comprising all types of mechanical connection by teeth, meat, etc., and any direction of the axis of rotation.
    Figures 17 and 18 show a fourth embodiment of the invention. The tongue 4 connected to the lever 1 has a rounded end 24, such as a hemisphere or ball, which moves within the meat-forming grooves provided on the external cylindrical surface of the screw 5. These grooves are provided in an alternating manner between grooves 25, which are inclined with respect to the longitudinal direction, and grooves 26, which are substantially longitudinal. In addition, the surface at the bottom of these grooves forms ramps with certain interruptions that allow the end 24 to be maintained in certain positions, as will be described in detail below.
    In the upper position of the lever, the end 24 of the tongue 4 is positioned in the rearmost part of an inclined groove 25. When the user acts on the lever, in order to press it down, a pressure force is transmitted to the screw 5 by the tongue. More precisely, a force with a longitudinal direction is applied by the end 24 in the groove 25, of which the inclination represents a ramp that triggers the rotation of the screw, while the end 24 of the tongue 4 moves along the inclined groove 25. In the at the end of the lever stroke, the end 24 of the tongue 4 reaches the end of the inclined groove 25. The length and shape of the inclined groove 25 therefore correspond to the amplitude of the lever's movement between its upper position and its lower position.
    The user then releases lever 1, which rises to its upper position under the effect of a return spring, not shown, integrated in tongue 4. This upward movement again directs tongue 4 backwards, and the movement of its end 24 into the longitudinal groove 26 below. When this end 24 reaches the final position of this longitudinal groove 26, in the upper position of the lever, it reaches a stable position in this slot, at the bottom of a groove in which a small step 27 prevents any return to the rear. This step 27 in the groove 26 thus performs the anti-return function for the screw 5, by generating a click of audible light at the moment when the tongue passes through. In this way, it represents a third alternative for the two types of non-return devices that will be described below with reference to Figures 20 to 27. Thus, the subsequent pressing of the lever moves the tongue to the inclined part 26 after the screw, once that causes its rotation, as already explained above. Alternatively, one or more complementary steps can be formed in these grooves 25, 26, depending on the application implemented.
    Finally, this solution makes it possible to achieve substantially the same result as the first modality, for example, by replacing the previous ratchet principle with a meat-based principle. The side pillars 29 prevent any lateral movement of the tongue 4, which thus moves exclusively in the longitudinal direction. Advantageously, these side pillars 29 can be integrated directly into the rear part 2b of the device body.
    Figure 19 illustrates a variant of this fourth embodiment of the invention. In this variant, the screw is the same as above. However, a drive element 30 for the screw is arranged at the end of the tongue 4. This drive element 30 has vertical side parts 31 adjacent to the body of the ejection device and thereby preventing any lateral movement. It has an internal surface that completely surrounds the screw 5. This surface has two coupling elements 24 positioned on each side of the threaded rod 3. Thus, each of these two coupling elements is positioned symmetrically in grooves of the screw 5, exactly at the same level. of a similar groove. In this way, the actuation of the lever moves the tongue 4, which transmits a longitudinal force of rotation of the rotation of the screw 5 by means of the drive element 30. Thus, the two coupling elements of the drive element 30 move simultaneously and symmetrically in the inside a groove of the screw 5, in a manner similar to the movement of the end 24 of the tongue 4, as explained above. This variant has the advantage of greater stability and better transmission of force from the tongue 4 to the screw 5, due to two complementary coupling elements. The coupling elements 24 are held at the bottom of the screw grooves 5 by an elastic blade 23 of the drive element 30. Alternatively, the drive element can comprise more than two coupling elements. In addition, the actuating element may comprise an elastic leaf-type spring, similar to blade 35, the end which promotes the return of the coupling elements 24 towards the rear during the upward movement of the lever, as a complement to the spring effect simple exerted by the lever.
    Finally, the means for controlling the screw in this fourth embodiment simply remains a tongue, optionally with a special drive element 30 at its lower end.
    Figures 20 and 21 show a first mode anti-return device for an ejection device according to the invention, its function being to prevent the screw 5 of the ejection device from rotating in the opposite direction so that it allows the ejection of the ejection device. product. These numbers show the tongue 4 connected to the lever 1 and acting on the ratchet formed on the periphery of the screw 5. The tongue 4 comprises a tooth 14 for its end that acts on a tooth 8 of the screw 5, as already explained with reference to Figure 3. The body of the ejection device comprises a non-return latch 41, in the form of an elastic blade made of plastic and obtained during the molding of the device body. During the activation of lever 1, this blade deforms, rubbing against the inclined ramp 39 formed by a tooth 8 of screw 5, in order to allow rotation of screw 5 in the direction of product ejection. When lever 1 reaches the end of its stroke, the blade forming the non-return latch 41 reaches the point of tooth 8, then tilts on the other side of the point against wall 40 of tooth 8. This inclination is accompanied by an elastic return of the non-return tongue 41 to its nominal position, generating an audible click from which the user easily identifies the end of this rotation movement of the screw. He can then release lever 1, which automatically moves back to its upper starting position, while at the same time, the anti-return tab blade 41 remains on the wall 40 of screw 5, preventing the rotation of the screw in the reverse direction.
    This rotation could be caused either by the friction of the tongue 4 on the screw 5, during the upward movement of the lever 1 or by the residual pressure of the product to be ejected. The non-return latch 41 thus performs a safety function and ensures that the pressure on the next lever 1 will, in fact, allow for another controlled advance of the threaded rod by the desired distance, in order to obtain the correct dose of the ejected product. . This design of the non-return tab has been described in connection with the first variant of the first embodiment of the ejection device according to the invention. However, it naturally remains compatible with all the other modes of the ejection device that have been described above.
    Figures 22 to 27 show a second embodiment of a non-return device for an ejection device according to the invention. Such a non-return device is based on a cylindrical component 42 provided in the area of the central hole of the rear part 2b, either separately or integrated with the latter, in which the threaded rod 3 is moved and comprises teeth 43 at one of its ends , which are coupled with the complementary teeth 34 that extend in the longitudinal direction of the screw 5. These teeth 34, 43 have an asymmetrical shape that allows the rotation of the screw 5 only in the direction of product ejection and prevents its rotation in the direction opposite.
    During the rotation of the screw under the effect of the tongue 4, its teeth 34 slide against those 43 of the anti-return device, due to the inclined parts that allow this sliding. This sliding of the teeth, at the same time causes a slight deflection of the screw 5 in the longitudinal direction, by a distance corresponding to the height of a tooth 43 of the non-return device.
    The end of the stroke of the lever 1 then corresponds to the phase in which the points of the teeth 34 escape from the screw 5 from the teeth 43 of the anti-return device and again make contact with the teeth below, the screw 5 recovering its starting position in the longitudinal direction. This final phase, at the end of the movement of the lever 1, is thus accompanied by an audible click, which, as in the previous modality, indicates the end of the ejection of the product dose corresponding to a lever actuation.
    At its second longitudinal end, in front of its toothed end 34, the screw 5 comprises an elastic blade 35, which cooperates with a fixed part 36 provided in the central part of the body of the ejection device. This elastic blade 35 has the function of returning the screw to its nominal position in the longitudinal direction in contact with the anti-return device. It is compressed against the fixed part 36 of the device when the screw deviates from its initial position, which generates an elastic force promoting the return of the screw in the corresponding teeth 43 of the anti-return device, at the end of the lever activation phase. .
    In addition, it should be noted that this slight longitudinal movement of the screw 5 towards the front of the ejection device during the activation of the lever tends to act on the threaded rod 3 in order to increase the pressure on the product to be ejected. Thus, this effect induces an additional force to promote product ejection, which is especially useful in the case of a particularly pasty product. However, this slight longitudinal movement of the screw 5, of course, has no influence on the final ejected dose, which depends only on the movement of the threaded rod between its initial position and the final position inside the ejection device at the beginning and at the end lever operation, while the screw occupies the same longitudinal position in these two lever end positions. If necessary, the movement of the screw can be dampened and compensated by the dimensions and front elasticity of the piston 16.
    This second design of a non-return device was illustrated in connection with the first embodiment of the invention. Alternatively, it remains compatible with the other embodiments of the invention. It can also take other forms. For example, Figures 11 to 13 represent the execution of the present project in the second embodiment of the invention, with a slight variation in which the teeth 43 of the anti-return device are coupled with an elastic blade whose end forms a tooth of the screw 5.
    Naturally, the invention is not limited to the modalities that have been described by way of example. It is possible to imagine other implementations of the concept of the invention involving combinations of the above modalities or equivalent characteristics. In particular, the means of controlling the threaded rod from the lever can be obtained differently, by a tongue in a totally different way, not necessarily in the form of a single piece component in the form of an axis, and / or teeth used for different projects can have different geometries and / or orientations, there can be many gears of different shapes, the screw can have any other shape, etc. The screw-based pusher mechanism and the threaded rod can be obtained by a plastic injection method, whereby most elements of the ejection device can be easily produced and made recyclable. The body of the ejection device may have other geometries.
    It may be envisaged that the lever will be manipulated so as to generate the passage of several teeth and audible clicks, that is, the ejection of several minimum doses, during a single actuation. Thus, its activation could then be partial, not necessarily covering its entire possible range of rotation, while operating according to the principle explained above.
    Finally, the solution according to the invention provides the following advantages: It allows the perfectly controlled ejection of small doses of product; It allows a simple and inexpensive mechanism compatible with the single use of a disposable injection device, of which all component parts are recyclable; It combines a simple design comprising several plastic parts that can be produced by injection, including a movable lever on a main body, and a simple rotation mechanism that allows great precision to be achieved without significantly increasing the complexity of the device.
    权利要求:
    Claims (15)
    [0001]
    1. Device for ejecting a liquid or pasty product, comprising a body having a recess (11) for receiving a product to be ejected, characterized by the fact that it comprises a threaded rod (3) disposed in a hole in the body, the rod threaded (3) being mobile in translation in order to act on the product to be ejected and having a substantially cylindrical shape with a surface in the direction of truncated translation, in order to prevent the rotation of the threaded rod (3) by coupling with a shape corresponding hole in the body; a screw (5) mounted in coupling with the threaded rod (3) in order to move in translation; a lever (1), which acts on the screw (5) by means of a control means to cause the rotation of the screw (5) when the lever (1) is pressed; and a non-return means connected to the device body and coupled with the screw (5), to prevent the reverse rotation of the screw (5) when the lever (1) is released, in which the non-return means is fixed in relation to the body and comprises an elastic blade that is in flexible coupling with the screw (5), the blade deformable from a nominal position, to allow the rotation of the screw (5) when the lever (1) is pressed and returns to the nominal position to prevent rotation of the screw (5) when the lever (1) is released, where one end of the threaded rod (3) is adapted to couple with a pusher piston (16) capable of acting on the liquid product or pasty.
    [0002]
    2. Device for ejecting a liquid or pasty product according to claim 1, characterized in that the control means comprise a tongue (4) connected to the lever (1).
    [0003]
    3. Device for ejecting a liquid or pasty product, according to claim 2, characterized by the fact that the lever (1) is mounted for rotation or flexion on an axis (7) arranged in the front part of it.
    [0004]
    4. Device for ejecting a liquid or pasty product according to claim 3, characterized in that the lever (1) comprises a shaft (7) at its front end, and a means for rotating assembly of the shaft (7) over the body.
    [0005]
    5. Device for ejecting a liquid or pasty product, according to claim 2, characterized in that the lever (1) and the tongue (4) form the same molded plastic component.
    [0006]
    6. Device for ejecting a liquid or pasty product according to claim 2, characterized in that the screw (5) comprises teeth (8; 17), or grooves (25, 26) in an outer peripheral surface coupling directly or indirectly with the tongue (4), the profile of the teeth (8; 17) extending in a vertical transverse plane (yz) and / or in a vertical longitudinal plane (xz) of the screw (5).
    [0007]
    7. Device for ejecting a liquid or pasty product according to claim 2, characterized in that the tongue (4) is in the form of an axis connected to the lever (1) at a first end, forming a movable axis elastic or non-elastic, and a second end capable of coupling to the teeth (8; 17) of a ratchet (10), the second rectangular end or the second end having one or more teeth (8; 17) towards that second end, or the second end comprising a rounded part capable of coupling to a groove (25; 26).
    [0008]
    8. Device for ejecting a liquid or pasty product, according to claim 2, characterized in that it comprises a ratchet (10) mounted in rotation around the threaded rod (3), the ratchet (10) having two or more teeth (8; 17) which are arranged on an external peripheral surface of the same and whose profile of the ratchet (10) extends in a vertical transverse plane (yz) to be coupled with the tongue (4), and comprising at least one tooth ( 8; 17) oriented in the longitudinal direction to be coupled with the screw (5), in order to drive the screw (5) in rotation during the activation of the lever (1).
    [0009]
    9. Device for ejecting a liquid or pasty product, according to claim 7, characterized by the fact that the screw (5) includes teeth (8; 17) on an external peripheral surface that directly or indirectly engages with the tongue ( 4), the teeth (8; 17) of the screw (5) or ratchet (10) have a pointed profile (38, 39,40) and are asymmetrical or have a rectangular, conical or trapezoidal symmetrical profile.
    [0010]
    10. Device for ejecting a liquid or pasty product, according to claim 1, characterized by the fact that the control means comprises one or more intermediate gears (20, 21, 22) to slow down the transmission speed of rotation to the screw (5).
    [0011]
    11. Device for ejecting a liquid or pasty product according to claim 1, characterized in that the screw (5) comprises an alternating sequence of inclined grooves (25) and longitudinal grooves (26) formed on an external cylindrical surface the same.
    [0012]
    12. Device for ejecting a liquid or pasty product according to claim 1, characterized in that it comprises a tongue (4) connected to the lever (1), of which one end (24) engages with the grooves (25, 26) of the screw (5) and / or because it comprises, at one end (24), a drive element (30) that comprises several coupling elements coupling with the grooves (25, 26) of the screw (5) , in order to make the screw (5) turn when operating the lever (1).
    [0013]
    13. Device for ejecting a liquid or pasty product, according to claim 1, characterized by the fact that it comprises a means to emit an audible click when a minimum dose is ejected by operating the lever (1) -
    [0014]
    14. Device for ejecting a liquid or pasty product according to claim 1, characterized in that it comprises a body comprising a front part (2a) to contain the product to be ejected, and a rear part (2b), on which the screw (5) is located.
    [0015]
    15. Device for ejecting a liquid or pasty product according to claim 14, characterized in that it comprises at least one tool holder (12) disposed on the front part (2a) of the ejection device body and / or a holder tool (12) disposed on the front (2a) of the body of the ejection device; and a Luer lock type locking means (14) for locking the tool holder (12) in the ejection device.
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    同族专利:
    公开号 | 公开日
    US9308057B2|2016-04-12|
    CU20120094A7|2012-06-29|
    AU2010329928A1|2012-06-21|
    JP2013513528A|2013-04-22|
    MX340174B|2016-06-29|
    BR112012013865A2|2016-05-10|
    CA2782553A1|2011-06-16|
    KR101775059B1|2017-09-05|
    WO2011070112A1|2011-06-16|
    FR2953415A1|2011-06-10|
    FR2953415B1|2012-12-28|
    CN102781363B|2016-05-18|
    EP2512363A1|2012-10-24|
    RU2012128566A|2014-01-20|
    CA2782553C|2017-10-03|
    TN2012000262A1|2013-12-12|
    KR20120112526A|2012-10-11|
    ZA201204517B|2013-07-31|
    MX2012006656A|2012-07-10|
    US20120248152A1|2012-10-04|
    CN102781363A|2012-11-14|
    JP6018918B2|2016-11-02|
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    法律状态:
    2018-03-27| B15K| Others concerning applications: alteration of classification|Ipc: A61C 5/62 (2017.01), A61M 5/315 (2006.01) |
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-07-23| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2019-11-26| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|
    2020-03-24| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-07-14| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/12/2010, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    FR0958814A|FR2953415B1|2009-12-09|2009-12-09|EJECTION DEVICE FOR EJECTING LOW DOSES|
    FR0958814|2009-12-09|
    PCT/EP2010/069278|WO2011070112A1|2009-12-09|2010-12-09|Ejection device for ejecting small doses|
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