• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PINS COUNTERFEITING VARIABLE ANGLE. A buttress pin for fixing an implant to a bone comprises a head at a close end, the head comprises a rounded external profile and includes first thread and an axis extending distally from the head, the axis including second thread extending over at least a portion of a length thereof, a position of an end close to the second thread along the axis being spaced from a distal end of the first thread by a distance equal to a distance between an end close to a hole in an implant to be fixed in a bone through the buttress pin and a bone surface when the implant is in a target position on the bone.
    公开号:BR112012011667B1
    申请号:R112012011667-3
    申请日:2010-11-16
    公开日:2020-10-20
    发明作者:Adam Hashmi；Dirk Kerstan
    申请人:Synthes Gmbh；
    IPC主号:
    专利说明:

    Priority claim
    [001] The present application claims priority to the provisional application
    [002] US no. Series 61 / 261,974 entitled "Variable angle locking buttress pins" deposited on November 17, 2009 for Adam Hashmi and Dirk Kerstan, whose full disclosure is incorporated here for reference. Field of invention
    [003] The present invention is directed to the field of bone fixation and more particularly, to a system and method for fixing fractured bones through a buttress pin insertable through a bone fixation device at an angle selected from a plurality from angles selected by a doctor. Background
    [004] Procedures for the fixation of intraarticular and extra-articular bone fractures and osteotomies of the distal ray and other smaller bones frequently employed variable angle locking screws with bone plates including correspondingly configured variable angle holes. The combination of a variable-angle locking screw with a variable-angle hole allows a user to select an angle of the screw (in an allowable range of angulation) in relation to a geometric axis of the hole to, for example, increase a resistance of retention with bone. Buttress pins are often used to prevent damage to the bone and surrounding soft tissue and to avoid misalignment of bone fragments during insertion. However, buttress pins have proved difficult to remove from the bone, for example, if it is desired to remove a bone plate after bone healing. Specifically, during withdrawal, buttress pins known in the art merely disengage from the plate hole a minimum distance and then maintain an axial position against the bone and bone plate. The rotation of a screwdriver simply causes these buttress pins to rotate in the bone, preventing a doctor from holding the pin to allow total removal of it. Summary of the invention
    [005] The present invention is directed to a buttress pin to fix an implant on a bone, comprising a head at an end close to the head comprising a rounded external profile and including first thread and an axis extending distally from the head, the axis including second thread extending over at least a portion of a length thereof, a position of a distal end of the second thread along the axis being spaced from a distal end of the first thread by a distance equal to a distance between an end close to a hole in an implant to be fixed in a bone through the buttress pin and a bone surface when the implant is in a target position in the bone. Brief description of the drawings
    [006] Figure 1 shows a perspective view of a system according to a first exemplary embodiment of the present invention;
    [007] Figure 2 shows a top view of the system in Figure 1; and
    [008] Figure 3 shows a perspective view of a system according to a second exemplary embodiment of the present invention. Detailed Description
    [009] The present invention can be further understood with reference to the following description and the attached drawings, in which similar elements are mentioned with the same reference numerals. Exemplary embodiments of the present invention relate to a system and method for fixing complex intra- and extra-articular bone fractures as well as distal radius osteotomies and other small bones in a body. The exemplary system and method of the present invention can also be used to reinforce lower quality bone, such as osteoporotic bone, where the purchase of the screw can be compromised. An exemplary bone retaining pin according to the present invention comprises a threaded head and shaft having a smooth distal portion and a rounded distal end configured to minimize soft tissue trauma as the buttress pin is inserted into a target bone while preventing displacement of bone fragments. To facilitate bone removal, the bone fixing buttress pin according to the present invention includes a threaded neck at an end close to the axis extending to a distal end of the head. As will be described in more detail below, the thread on the neck is positioned so that as the buttress pin is being inserted through a bone plate hole in a bone, the thread on the head of the buttress pin first engages the hole of the bone plate at about the same time that a more distal end of the neck thread first engages the bone without causing compression of the bone plate to the bone. In an exemplary embodiment, the buttress pin of the present invention is used for fixing the distal radius or other small bones in the body. However, it will be understood by those skilled in the art that the buttress pin of the present invention can be used for fixing any type of bone in the body.
    [0010] As shown in figures 1-2, a buttress pin 100 according to a first exemplary embodiment of the present invention comprises a head 102 and an axis 104 extending distally thereafter to a rounded distal end 106. The buttress pin 100 according to this exemplary modality, it is formed of titanium or 316L stainless steel. nevertheless, as those skilled in the art will understand, buttress pins according to the present invention can be formed of any suitable material. Head 102 includes thread 108 around a surface of the same configured to lockably engage a corresponding thread formed in a hole extending through a bone implant (e.g., a bone plate, not shown). The thread 108 according to this modality is a double thread thread configured to engage a double thread thread of a bone plate hole (not shown). However, those skilled in the art will understand that single fillet thread can be used, if desired. That is, a buttress pin according to the present invention will preferably be used in combination with a bone clamping device (e.g., bone plate) having a hole configured to lock the head of the buttress pin. A face close to the head 102 comprises a screw key engagement recess 103 configured to allow engagement of the buttress pin 100 with a screw key (not shown) as would be understood by those skilled in the art. It is noted that although the screwdriver hitch recess 103 is shown to have a star-shaped cross section, the screwdriver hitch recess 103 may have any other shape, including slotted, cross, square, hexagonal or any other shape configured to engage a respective shape screwdriver (not shown). In an exemplary embodiment, the recess 103 may extend into the head 102 by a predetermined distance sufficient to allow secure engagement with the screwdriver. Head 102 is formed with a rounded outer wall having a substantially spherical outer profile. It is observed, however, that a conical external profile of the head can also be used without deviating from the spirit and scope of the present invention. In an exemplary embodiment, a longitudinal length of head 102 ranges from approximately 1.7 - 2.34 mm, although any other length can be employed to accommodate insertion of head 102 into a hole extending through the bone implant (not shown) so that when mounted on the bone as desired, the head 102 does not protrude close beyond a surface close to a bone plate (i.e., a surface facing away from the bone) through which it is inserted.
    [0011] A distal end of the head 102 is connected to the axis 104 through a rounded connection opening to a smooth non-threaded section 110 extending from the end near the axis 104 to the distal end of a threaded portion 112 of the axis 104. Observe it is understood, however, that the non-threaded section 110 can also be provided with threads without departing from the scope of the present invention. The length of the threaded portion 112 is selected based on an average distance between a lower surface of the bone plate (not shown) contacting the bone and the cortex near the bone. The non-threaded section 110 can be formed of any suitable length and outside diameter. The threaded portion 112 includes thread 114 extending over a portion of the length of the shaft 104. A distal end of the thread 114 is preferably positioned so that the thread 114 first engages the bone at approximately the same time that the distal end of the thread 108 engages first the thread of the hole in the bone plate through which it is being inserted. Thread 114 according to this modality is a single thread thread corresponding to the thread formed in traditional cortical screws. Those skilled in the art will understand that although head 102 comprises double-threaded thread 108 and thread 115 is single-threaded thread, each of these threaded portions 108, 114 will rotate at the same speed since the threaded profile of head 102 is approximately half that of thread 114. The pitches of threads 108 and 114 are preferably the same so that as the pin 100 is pushed into the bone and engaged with the hole in the bone plate, the bone plate is not reduced in relation to the bone - that is, so that the axial displacement of the head 102 in relation to the bone plate by turning the pin 100 is equal to the axial displacement of the axis 104 in relation to the bone by turning. In a pin according to an alternating embodiment (not shown) of the invention, the threads 114 of the threaded portion 112 can be formed with a variable pitch to allow the threads 114 to be more pointed and cut into the bone (not shown) more easily. In such an embodiment, a diameter of the threaded portion 112 of the axis 104 remains substantially constant over an axis length thereof.
    [0012] An external diameter of thread 114 of pin 100 shown in figures 1 - 2 decreases from a diameter of approximately 2.4 mm at a close end to a second diameter of approximately 1.8 mm at a distal end over a tapering angle of approximately 100 0 threading of thread 114 assists in initiating threads on the target bone since the exemplary thread 114 does not comprise any cutting groove, as those skilled in the art will understand. It is further observed that any diameter and tapering angle of the threaded portion 112 can be employed without departing from the scope of the present invention. In addition, in an exemplary embodiment of the present invention, the threaded portion 112 has a longitudinal length of approximately 4 mm. Those skilled in the art will understand that this length can be changed based on the dimensions of a bone implant to be employed with the pin and the spatial relationship of the bone implant to the bone. Specifically, in a preferred embodiment, a distal end of thread 114 is configured to engage bone approximately at the same time that thread 108 comes into contact with the bone implant. In this way, the threaded portion 112 is preferably positioned and dimensioned so that when the distal end of the thread 108 is seated at the end close to a bone plate hole through which the pin 100 will be inserted, the distal end of the threaded portion 112 contacts the outer surface of the bone. If the bone implant is configured to lie flat against the bone and is approximately 4 mm thick, the distal end of the threaded portion 112 will be positioned 4 mm away from the distal end of the thread 108. Those skilled in the art will understand that the portion threaded 112 therefore allows the buttress pin 100 to be unscrewed from the bone by a sufficient distance to allow a physician to hold the head 102 to remove the buttress pin 100 from the bone. Specifically, the threaded portion 112 is configured to engage the bone (not shown) while the head 102 is still separated from the target bone plate (not shown) approximately one turn from the thread 114. In this way, the threaded portion 112 allows a user hold head 102 with a pair of forceps to assist removal from the bone without significantly complicating the removal procedure. As those skilled in the art will understand, the forceps can be formed with sawn grip portions to assist in holding the head 102.
    [0013] According to an exemplary method, an exemplary bone implant (for example, a distal dorsal ray plate) is positioned on a target portion of a fractured, osteoporotic or otherwise weakened bone as a distal ray (not shown) ). A variable angle locking drill guide is then screwed through a target plate hole (not shown) and into the bone. As those skilled in the art will understand, the drilling guide and plate hole are formed with dimensions suitable for receiving the buttress pin 100 through them. In the mode discussed, the drill guide can be a 1.8 mm drill guide. The drilling guide is inserted into the bone at a desired angle selected to suit the requirements of the procedure being performed. A drill is then used to drill bi-cortically through the bone. It is noted, however, that the drill can optionally extend through a uni-cortical portion of the bone if so desired. The drill guide is then removed from the bone using a technique known in the art. The buttress pin 100 is then positioned through the plate hole (not shown) and into the hole (not shown) using the pre-drilled hole as a guide. Specifically, the buttress pin 100 is manually pushed into the bone until the threads 114 come into contact with the bone. The doctor or other user then uses a screwdriver to insert the buttress pin 100 into the bone until the head 102 is firmly seated in the bone implant hole. The rounded distal end 106 of the buttress pin 106 allows the physician to insert the buttress pin 100 through the implant and into the bone while minimizing damage to the surrounding soft tissue. In addition, the tapered shape of the head 102 and thread 108 are configured to correspond to an inner shape of a variable angle locking hole in a bone implant so that the buttress pin 100 can be inserted through it at any desired angle within a range of ± 15 0 from a central geometric axis of the hole, as those skilled in the art will understand. As those skilled in the art will understand, a bone plate or other implant can be attached to one or more desired bone portions using any number of buttress pins 100 individually or in combination with any number of other screws and / or bone fixation pins. In addition, in a preferred embodiment, the exemplary buttress pins 100 according to the present invention can be used on a head of the distal radius plate although any other positions can be employed without departing from the spirit and scope of the present invention.
    [0014] As shown in figure 3, a buttress pin 200 according to an alternate embodiment of the invention is formed substantially similar to the buttress pin 100 of figure 1 except that an axis length 204 is shorter than the axis length 104 In an exemplary embodiment, a length of the threaded portion 212 remains substantially constant regardless of an axis length 204, which can vary in length from 8 mm to 30 mm depending on the dimensions of a target bone. A pitch of the thread 208 on the head 202 of the buttress pin 200 can be equal to a pitch of the threads 214 of the threaded portion 212 of the axis 204 so that, as the pin 200 is pushed into the bone and engaged with the bore of the bone plate, the bone plate is not reduced in relation to the bone, as described in greater detail previously with respect to figures 1-2. In another embodiment of the invention, the pitch of the thread 208 can be smaller than the pitch of the threads 214 so that as the pin 200 is rotated into the bone and the head 202 is rotated into the bone plate, the bone and bone plate are pulled towards each other by pressing the bone plate against the bone. A distal portion of axis 204 further comprises an unthreaded tapered portion 216 that tapers downward to a reduced diameter at a distal end 206 of buttress pin 200. The threaded portion 212 is formed with a thread substantially similar to the threaded portion 112 as described in greater detail earlier.
    [0015] The head 202 of the buttress pin 200 is also formed with a substantially spherical external profile to allow engagement with a rounded plate hole. In another embodiment, the external profile of the head 202 may be substantially tapered to allow insertion into a respectively formed plate hole, as those skilled in the art will understand. As those skilled in the art will understand, the substantially tapered bore may comprise other characteristics to allow angulation of the buttress pin 100 within it. It will be understood by those skilled in the art that buttress implants 100, 200 can be endowed with any of a plurality of other characteristics without deviating from the scope of the present invention. Specifically, axes 104 204 can be provided with any plurality of cutting grooves to assist in inserting them into the bone. The rounded distal ends 106, 206 can also be alternately formed from any other blind shape (e.g., square, etc.). In addition, the exemplary buttress pins 100 of the present invention can be employed with any variable angle locking compression plate hole ("LCP") extending across the plate or through a plate locking hole if inserted along a hole axis of the locking hole. In addition, it is noted that while the exemplary system and method of the present invention are directed to variable-angle locking pins, non-variable-angle locking pins can also be employed without departing from the spirit and scope of the present invention.
    [0016] It will be evident to those skilled in the art that various modifications and variations can be made in the structure and methodology of the present invention, without departing from the spirit or scope of the invention. Thus, it is intended that the present invention covers the modifications and variations of the present invention with the proviso that they are included in the scope of the claims only and their equivalents.
    权利要求:
    Claims (11)
    [0001]
    1. Combination of a buttress pin (100) and an implant to be attached to a bone through the buttress pin (100), Buttress pin (100) comprises: A head (102) at a proximal end, the head (102) comprising a rounded outer profile and including first thread (108); and A shaft (104) extending distally from the head (102), the shaft (104) including second thread (114) extending over at least a portion of a length thereof, a position of a proximal end of the second thread (114) along the axis (104) being spaced from a distal end of the first thread (108) by a distance equal to a distance; and the implant comprising a variable angle locking hole for receiving the buttress pin (102); wherein a pitch of the first thread (108) is the same as a pitch of the second thread (114); and an external profile of the head (102) is configured to correspond to the variable angle locking hole into which it must be inserted to allow its insertion through the variable angle locking hole at any angle within an allowable angle range; characterized by the fact that the distance is equal to a distance between a proximal end of the hole and a bone surface when the implant is in a target position in the bone.
    [0002]
    2. Combination according to claim 1, characterized by the fact that the first thread (108) is double-threaded.
    [0003]
    3. Combination according to claim 1, characterized by the fact that the second thread (114) is a single-thread thread.
    [0004]
    Combination according to claim 1, characterized in that the second thread (114) is tapered so that a diameter of the second thread (114) at a proximal end of it is greater than a diameter at one end away from it.
    [0005]
    5. Combination according to claim 4, characterized by the fact that the tapering angle is 10 degrees.
    [0006]
    6. Combination, according to claim 1, characterized by the fact that the head (102) is configured to allow insertion of the pin through a variable angle locking hole in an angulation range of +15 degrees.
    [0007]
    7. Combination according to claim 1, characterized by the fact that the distal end of the axis (104) is rounded.
    [0008]
    8. Combination according to claim 1, characterized by the fact that it still comprises a non-threaded section (110) between the first and second threads (108, 114).
    [0009]
    9. Combination, according to claim 1, characterized by the fact that it still comprises a recess of screwdriver (103) in a proximal face of the head (102) configured to allow engagement with a drive mechanism.
    [0010]
    10. Combination according to claim 1, characterized by the fact that an external profile of the head (102) is spherical.
    [0011]
    11. Combination, according to claim 1, characterized by the fact that the variable angle locking hole of the implant has a thread corresponding to the first thread (108) of the buttress pin (100).
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-08-27| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-07-21| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-10-20| 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 16/11/2010, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US26197409P| true| 2009-11-17|2009-11-17|
    US61/261.974|2009-11-17|
    PCT/US2010/056833|WO2011062896A1|2009-11-17|2010-11-16|Variable angle locking buttress pins|
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