CN211156486U - Knee joint fusion prosthesis - Google Patents
Knee joint fusion prosthesis Download PDFInfo
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- CN211156486U CN211156486U CN201921549149.XU CN201921549149U CN211156486U CN 211156486 U CN211156486 U CN 211156486U CN 201921549149 U CN201921549149 U CN 201921549149U CN 211156486 U CN211156486 U CN 211156486U
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Abstract
The utility model provides a knee joint fusion prosthesis, which comprises a femur component, a tibia component, a first intramedullary rod, a second intramedullary rod, a first connecting piece and a second connecting piece, wherein the femur component comprises a first rod connecting part and a first thigh shin connecting part, the first rod connecting part is used for being fixedly connected with the first intramedullary rod, the first thigh shin connecting part is provided with a clamping groove, the tibia component comprises a second rod connecting part and a second thigh shin connecting part, the second rod connecting part is used for being fixedly connected with the second intramedullary rod, at least one part of the structure of the second thigh shin connecting part is positioned in the clamping groove and is in spacing fit with the inner wall of the clamping groove, the first connecting piece is arranged in the first thigh shin connecting part and the second thigh shin connecting part in a penetrating way so as to fixedly connect the first thigh shin connecting part and the second thigh shin connecting part, the second connecting piece is arranged in the second thigh shin connecting part in a penetrating way, and the second connecting, to resist removal of the first connector from the first femoral shank joint or the second femoral shank joint.
Description
Technical Field
The utility model relates to the technical field of medical equipment, particularly, relate to a knee joint fuses false body.
Background
With the annual increase of the total knee joint replacement number, the number of postoperative failures is also increasing, especially infection after total knee joint replacement can cause a large amount of bone defects of the knee joint to cause failure of the knee extension device, and when total knee joint revision surgery cannot be well solved, knee joint fusion surgery is needed. In addition, knee fusion is also required in some cases in the limb protection treatment of bone tumors around the knee joint.
At present, the existing knee joint fusion prosthesis is mainly used for connecting a femoral component and a tibial component together through screws, the initial fixing effect is satisfied, but the loosening of threads can happen in the long term, so that the loosening of the fusion prosthesis is caused, and the failure of the operation is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a knee joint fusion prosthesis to the problem that the knee joint fusion prosthesis among the solution prior art is not hard up easily when using for a long time.
In order to solve the above problem, the utility model provides a knee joint fusion prosthesis, include: the bone fracture joint comprises a femoral component, a tibial component, a first intramedullary rod, a second intramedullary rod, a first connecting piece and a second connecting piece, wherein the first intramedullary rod is used for being fixedly connected with a femur, and the second intramedullary rod is used for being fixedly connected with a tibia; the femur component comprises a first rod connecting part and a first femoral neck connecting part which are connected with each other, the first rod connecting part is used for being fixedly connected with the first intramedullary rod, and the first femoral neck connecting part is provided with a clamping groove; the tibia component comprises a second rod connecting part and a second thigh tibia connecting part which are connected with each other, the second rod connecting part is used for being fixedly connected with a second intramedullary rod, and at least part of structure of the second thigh tibia connecting part is positioned in the clamping groove and is in limit fit with the inner wall of the clamping groove; the first connecting piece is arranged in the first thigh shin connecting part and the second thigh shin connecting part in a penetrating mode so as to fixedly connect the first thigh shin connecting part and the second thigh shin connecting part; the second connecting piece is arranged in the second thigh shin connecting part in a penetrating mode, and the second connecting piece is in limit fit with the first connecting piece and the second thigh shin connecting part respectively to prevent the first connecting piece from being separated from the first thigh shin connecting part or the second thigh shin connecting part.
Furthermore, the first connecting piece is provided with a limiting groove, and a part of structure of the second connecting piece is positioned in the limiting groove so as to limit the length direction of the first connecting piece.
Furthermore, the first connecting piece is of a columnar structure, the extending direction of the limiting groove is perpendicular to the axial direction of the first connecting piece, and the length direction of the second connecting piece is perpendicular to the length direction of the first connecting piece.
Further, the second connecting piece includes the fixed axle, the location boss with prevent moving back the boss and set up respectively at the both ends of fixed axle, the diameter of fixed axle is less than the radial dimension of location boss and prevents moving back the radial dimension of boss, the fixed axle wear to establish in second thigh shin connecting portion and with the spacing cooperation of first connecting piece, the location boss is with the spacing cooperation of one side of second thigh shin connecting portion, the location boss is with the spacing cooperation of the opposite side of second thigh shin connecting portion.
Furthermore, the second connecting piece is made by elastic material, prevents moving back the radial dimension that the boss is less than the radial dimension of location boss, and the second connecting piece still includes the direction conical head, and the direction conical head is connected with preventing moving back the boss.
Furthermore, one side of the second thigh of shin connecting portion is provided with a first limiting face, the other side of the second thigh of shin connecting portion is provided with a second limiting face, the first limiting face and the second limiting face are arranged in parallel, the positioning boss is in limiting fit with the first limiting face, and the anti-retreat boss is in limiting fit with the second limiting face.
Further, the second thigh shin connecting portion has first recess and the second recess of interval setting, and first recess has the first side wall, and the second recess has the second side wall, and the structure that is located between first side wall and the second side wall of second thigh shin connecting portion is located the draw-in groove, and the draw-in groove has third side wall, fourth side wall and first tank bottom, and wherein, third side wall and first side wall spacing cooperation, fourth side wall and second side wall spacing cooperation, first tank bottom and the terminal surface spacing cooperation of second thigh shin connecting portion.
Furthermore, the first groove is also provided with a fifth side wall, a sixth side wall and a second groove bottom, and the second groove is also provided with a seventh side wall, an eighth side wall and a third groove bottom; the first thigh shin connecting part comprises a first split and a second split which are arranged on the first rod connecting part at intervals, the clamping groove is positioned between the first split and the second split, the first connecting part sequentially penetrates through the first split, the second thigh shin connecting part and the second split, the first split is provided with a ninth side wall, a tenth side wall and a first top wall, and the second split is provided with an eleventh side wall, a twelfth side wall and a second top wall; the first split body is positioned in the first groove, the ninth side wall is in limit fit with the fifth side wall, the tenth side wall is in limit fit with the sixth side wall, and the first top wall is in limit fit with the bottom of the second groove; the second split body is located in the second groove, the eleventh side wall is in limit fit with the seventh side wall, the twelfth side wall is in limit fit with the eighth side wall, and the second top wall is in limit fit with the bottom of the third groove.
Furthermore, the first rod connecting part is detachably connected with the first intramedullary rod, the second rod connecting part is detachably connected with the second intramedullary rod, the knee joint fusion prosthesis further comprises a first limiting part and a second limiting part, the first limiting part is arranged on the first rod connecting part and is in limiting fit with the first intramedullary rod, and the second limiting part is arranged on the second rod connecting part and is in limiting fit with the second intramedullary rod.
Furthermore, the first intramedullary rod is provided with a first stopping groove, the first limiting part comprises a first fixing part and a first stopping column arranged on the first fixing part, one end of the first intramedullary rod is arranged in the first rod connecting part in a penetrating manner, the first stopping groove is positioned in the first rod connecting part, the first fixing part is arranged in the first rod connecting part in a penetrating manner, and the first stopping column is positioned in the first stopping groove to limit the first intramedullary rod; the second intramedullary rod is provided with a second stopping groove, the second limiting part comprises a second fixing part and a second stopping column arranged on the second fixing part, one end of the second intramedullary rod is arranged in the second rod connecting part in a penetrating mode, the second stopping groove is located in the second rod connecting part, the second fixing part is arranged in the second rod connecting part in a penetrating mode, and the second stopping column is located in the second stopping groove to limit the second intramedullary rod.
By applying the technical proposal of the utility model, a femur component, a tibia component, a first intramedullary rod, a second intramedullary rod, a first connecting piece and a second connecting piece are arranged in the knee joint fusion prosthesis, the femur component comprises a first rod connecting part and a first thigh shin connecting part, the first rod connecting part is used for being fixedly connected with the first intramedullary rod, the first thigh shin connecting part is provided with a clamping groove, the tibia component comprises a second rod connecting part and a second thigh shin connecting part, the second rod connecting part is used for being fixedly connected with the second intramedullary rod, at least one part of the structure of the second thigh shin connecting part is positioned in the clamping groove and is in spacing fit with the inner wall of the clamping groove, the first connecting piece is arranged in the first thigh shin connecting part and the second thigh shin connecting part in a penetrating way to fixedly connect the first thigh shin connecting part and the second thigh shin connecting part, the second connecting piece is arranged in the second thigh shin connecting part in a penetrating way, and the second, to resist removal of the first connector from the first femoral shank joint or the second femoral shank joint. Like this first thigh shin connecting portion and second thigh shin connecting portion adopt the mode of joint to be connected, can carry out spacing cooperation better, it is fixed with first thigh shin connecting portion and second thigh shin connecting portion through first connecting piece to carry on spacingly through the second connecting piece to first connecting piece, can avoid first connecting piece to deviate from in first thigh shin connecting portion or the second thigh shin connecting portion, thereby avoided taking place the problem that the pine takes off, improved the reliability that thighbone part and shin bone part are connected for a long time.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 illustrates an assembly view of a knee fusion prosthesis provided by an embodiment of the present invention;
FIG. 2 illustrates an assembly view of the femoral and tibial components of FIG. 1;
FIG. 3 shows a cross-sectional view of FIG. 2;
FIG. 4 shows a schematic view of the femoral component of FIG. 1;
FIG. 5 shows a schematic view of the tibial component of FIG. 1;
FIG. 6 shows another schematic view of the tibial component of FIG. 5;
FIG. 7 shows a schematic view of the first connector of FIG. 1;
FIG. 8 shows a schematic view of the second connector of FIG. 1;
fig. 9 shows a schematic view of the first stem in fig. 1;
fig. 10 shows a schematic view of the first limiting member in fig. 1.
Wherein the figures include the following reference numerals:
10. a femoral component; 11. a first lever connecting portion; 12. a first thigh link portion; 13. a first fixing hole; 14. a card slot; 15. a first connection hole; 20. a tibial component; 21. a second rod connecting portion; 22. a second femoral shank attachment portion; 23. a second fixing hole; 24. a first groove; 25. a second connection hole; 26. a third connection hole; 27. a first limiting surface; 28. a second limiting surface; 29. a second groove; 30. a first connecting member; 31. a limiting groove; 40. a second connecting member; 41. a fixed shaft; 42. a guiding conical head; 43. the anti-back boss; 44. a striking groove; 45. positioning the boss; 50. a first intramedullary rod; 51. a fixed part; 52. the intramedullary part; 53. a first retaining groove; 60. a first limit piece; 61. a first fixing member; 62. a first backstop post; 70. a second intramedullary rod; 80. a second limiting member.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-10, embodiments of the present invention provide a knee fusion prosthesis, comprising: the bone comprises a femoral component 10, a tibial component 20, a first intramedullary rod 50, a second intramedullary rod 70, a first connector 30 and a second connector 40, wherein the first intramedullary rod 50 is used for being fixedly connected with a femur, and the second intramedullary rod 70 is used for being fixedly connected with a tibia; the femoral component 10 comprises a first rod connection part 11 and a first femoral shank connection part 12 which are connected with each other, the first rod connection part 11 is used for being fixedly connected with the first intramedullary rod 50, and the first femoral shank connection part 12 is provided with a clamping groove 14; the tibia component 20 comprises a second rod connecting part 21 and a second femur connecting part 22 which are connected with each other, the second rod connecting part 21 is used for being fixedly connected with the second intramedullary rod 70, and at least part of the structure of the second femur connecting part 22 is positioned in the clamping groove 14 and is in limit fit with the inner wall of the clamping groove 14; the first connecting member 30 is inserted into the first and second femoral shank connecting parts 12 and 22 to fixedly connect the first and second femoral shank connecting parts 12 and 22; the second connecting element 40 is inserted into the second thigh shank connecting portion 22, and the second connecting element 40 is in limit fit with the first connecting element 30 and the second thigh shank connecting portion 22 respectively to prevent the first connecting element 30 from being pulled out from the first thigh shank connecting portion 12 or the second thigh shank connecting portion 22.
By applying the technical scheme of the utility model, a femur component 10, a tibia component 20, a first intramedullary rod 50, a second intramedullary rod 70, a first connecting piece 30 and a second connecting piece 40 are arranged in a knee joint fusion prosthesis, the femur component 10 comprises a first rod connecting part 11 and a first thigh connecting part 12, the first rod connecting part 11 is used for being fixedly connected with the first intramedullary rod 50, the first thigh connecting part 12 is provided with a clamping groove 14, the tibia component 20 comprises a second rod connecting part 21 and a second thigh connecting part 22, the second rod connecting part 21 is used for being fixedly connected with the second intramedullary rod 70, at least one part of the structure of the second thigh connecting part 22 is positioned in the clamping groove 14 and is in limit fit with the inner wall of the clamping groove 14, the first connecting piece 30 is arranged in the first thigh connecting part 12 and the second thigh connecting part 22 in a penetrating way so as to fixedly connect the first thigh connecting part 12 and the second thigh connecting part 22, the second connecting piece 40 is arranged in the second thigh connecting part 22, and the second connecting element 40 is in limit fit with the first connecting element 30 and the second femoral shank connecting part 22 respectively to prevent the first connecting element 30 from escaping from the first femoral shank connecting part 12 or the second femoral shank connecting part 22. Like this first thigh shin connecting portion 12 and second thigh shin connecting portion 22 adopt the mode of joint to connect, can carry out spacing cooperation better, it is fixed with first thigh shin connecting portion 12 and second thigh shin connecting portion 22 through first connecting piece 30, and carry out spacingly to first connecting piece 30 through second connecting piece 40, can avoid first connecting piece 30 to deviate from first thigh shin connecting portion 12 or second thigh shin connecting portion 22, thereby avoided taking place the problem that the pine takes off, the reliability of femoral component 10 and tibial component 20 long-term connection has been improved.
Alternatively, the first thigh link part 12 has a first coupling hole 15, the second thigh link part 22 has a second coupling hole 25, the first coupling hole 15 is disposed corresponding to the second coupling hole 25, the first coupling member 30 is inserted into the first coupling hole 15 and the second coupling hole 25, the second thigh link part 22 has a third coupling hole 26, and the second coupling member 40 is inserted into the third coupling hole 26.
In the embodiment, the first connecting member 30 has a limiting groove 31, and a part of the second connecting member 40 is located in the limiting groove 31 to limit the length direction of the first connecting member 30. Thus, the length direction of the first connecting member 30 can be limited by the engagement of the second connecting member 40 with the inner wall of the limiting groove 31, so that the first connecting member 30 is prevented from being released from the first femoral shank connecting portion 12 or the second femoral shank connecting portion 22.
Specifically, the first connecting member 30 is a columnar structure, the extending direction of the limiting groove 31 is perpendicular to the axial direction of the first connecting member 30, and the length direction of the second connecting member 40 is perpendicular to the length direction of the first connecting member 30. Through the above arrangement, the first connecting member 30 can be reliably limited.
As shown in fig. 8, the second connecting element 40 includes a fixing shaft 41, a positioning boss 45 and a retreat-preventing boss 43, the positioning boss 45 and the retreat-preventing boss 43 are respectively disposed at two ends of the fixing shaft 41, the diameter of the fixing shaft 41 is smaller than the radial dimension of the positioning boss 45 and the radial dimension of the retreat-preventing boss 43, the fixing shaft 41 is arranged in the second thigh shin connecting portion 22 in a penetrating manner and is in limit fit with the first connecting element 30, the positioning boss 45 is in limit fit with one side of the second thigh shin connecting portion 22, and the positioning boss 45 is in limit fit with the other side of the second thigh shin connecting portion 22. Through the above arrangement, after the fixing shaft 41 is inserted into the second thigh shin connecting portion 22, the fixing shaft 41 can be limited at both ends by the positioning boss 45 and the anti-retreating boss 43, so that the fixing shaft 41 is prevented from being disengaged, and the connection reliability is improved.
In this embodiment, the second connecting member 40 is made of an elastic material, the radial dimension of the anti-back boss 43 is smaller than the radial dimension of the positioning boss 45, the second connecting member 40 further includes a guiding conical head 42, and the guiding conical head 42 is connected with the anti-back boss 43. So that the second coupling element 40 is elastically deformable to some extent to facilitate the penetration of the second coupling element 40 into the second femoral shank attachment portion 22. Optionally, the second connector 40 is made of polyethylene. The guiding function can be achieved by arranging the guiding conical head 42, and the second connecting piece 40 can be conveniently penetrated. Optionally, the positioning boss 45 has a striking slot 44 therein to facilitate placement and securing of a tool to pass the second coupling element 40 into the second femoral shank attachment portion 22 by tapping.
In this embodiment, one side of the second thigh shank connecting portion 22 has a first limiting surface 27, the other side of the second thigh shank connecting portion 22 has a second limiting surface 28, the first limiting surface 27 and the second limiting surface 28 are parallel to each other, the positioning boss 45 is in limiting fit with the first limiting surface 27, and the anti-back boss 43 is in limiting fit with the second limiting surface 28. Therefore, good limiting and positioning effects can be achieved.
As shown in fig. 4 to 6, the second thigh shank connecting portion 22 has a first groove 24 and a second groove 29 which are arranged at an interval, the first groove 24 has a first side wall, the second groove 29 has a second side wall, a structure of the second thigh shank connecting portion 22 between the first side wall and the second side wall is located in the slot 14, the slot 14 has a third side wall, a fourth side wall and a first slot bottom, wherein the third side wall is in limit fit with the first side wall, the fourth side wall is in limit fit with the second side wall, and the first slot bottom is in limit fit with an end face of the second thigh shank connecting portion 22. Through the arrangement, the second thigh shin connecting part 22 and the first thigh shin connecting part 12 can be limited mutually while being connected, so that relative movement is avoided, and the connection reliability is improved.
Further, the first groove 24 further has a fifth sidewall, a sixth sidewall and a second groove bottom, and the second groove 29 further has a seventh sidewall, an eighth sidewall and a third groove bottom; the first thigh shin connecting part 12 comprises a first split and a second split which are arranged on the first rod connecting part 11 at intervals, the clamping groove 14 is positioned between the first split and the second split, the first connecting piece 30 sequentially penetrates through the first split, the second thigh shin connecting part 22 and the second split, the first split is provided with a ninth side wall, a tenth side wall and a first top wall, and the second split is provided with an eleventh side wall, a twelfth side wall and a second top wall; the first separator is positioned in the first groove 24, the ninth side wall is in limit fit with the fifth side wall, the tenth side wall is in limit fit with the sixth side wall, and the first top wall is in limit fit with the bottom of the second groove; the second subassembly is located second recess 29, and the spacing cooperation of eleventh lateral wall and seventh lateral wall, the spacing cooperation of twelfth lateral wall and eighth lateral wall, second roof and the spacing cooperation of third groove bottom. Through the arrangement, a plurality of side walls of the first thigh shin connecting part 12 and a plurality of side walls of the second thigh shin connecting part 22 are matched in a one-to-one correspondence mode, the effect of limiting each other is further improved, the connection reliability is improved, and looseness is avoided.
In this embodiment, the first rod connecting portion 11 is detachably connected to the first intramedullary rod 50, the second rod connecting portion 21 is detachably connected to the second intramedullary rod 70, the knee fusion prosthesis further includes a first limiting member 60 and a second limiting member 80, the first limiting member 60 is disposed on the first rod connecting portion 11 and is in limit fit with the first intramedullary rod 50, and the second limiting member 80 is disposed on the second rod connecting portion 21 and is in limit fit with the second intramedullary rod 70. In this way, the first stopper 60 and the second stopper 80 can improve the connection reliability between the first rod connecting portion 11 and the first intramedullary rod 50 and the connection reliability between the second rod connecting portion 21 and the second intramedullary rod 70, respectively, and prevent the loosening.
Specifically, as shown in fig. 9 and 10, the first intramedullary rod 50 has a first stopping groove 53, the first limiting member 60 includes a first fixing member 61 and a first stopping post 62 disposed on the first fixing member 61, one end of the first intramedullary rod 50 is inserted into the first rod connecting portion 11, the first stopping groove 53 is located in the first rod connecting portion 11, the first fixing member 61 is inserted into the first rod connecting portion 11, and the first stopping post 62 is located in the first stopping groove 53 to limit the first intramedullary rod 50; the second rod 70 has a second stopping groove, the second position-limiting member 80 includes a second fixing member and a second stopping post disposed on the second fixing member, one end of the second rod 70 is inserted into the second rod connecting portion 21, the second stopping groove is disposed in the second rod connecting portion 21, the second fixing member is inserted into the second rod connecting portion 21, and the second stopping post is disposed in the second stopping groove to limit the second rod 70. Therefore, the first intramedullary rod 50 can be limited through the matching of the first retaining column 62 and the first retaining groove 53, and the second intramedullary rod 70 can be limited through the matching of the second retaining column and the second retaining groove.
Alternatively, the first rod connecting portion 11 has a first fixing hole 13, the first fixing piece 61 is screw-coupled with an inner wall of the first fixing hole 13, and the second rod connecting portion 21 has a second fixing hole 23, the second fixing piece being screw-coupled with an inner wall of the second fixing hole 23. The extending direction of the first stem 50 and the extending direction of the second stem 70 form an included angle to meet the physiological requirement. The first intramedullary rod 50 has a fixing portion 51 and an intramedullary portion 52 connected to each other, the fixing portion 51 having a tapered surface to penetrate into the first rod connecting portion 11 for easy fitting, and the intramedullary portion 52 having grooves and ridges on the circumferential surface to engage with the femoral medullary cavity.
In order to facilitate understanding of the present solution, the assembly and implantation process of the knee fusion prosthesis will be described below.
The first step is as follows: assembly femoral component
Firstly, the femoral intramedullary canal is processed by a special intramedullary reamer, the diameter and the length of a first intramedullary rod 50 which can be matched with the femoral intramedullary canal are selected, then the fixed part 51 of the selected first intramedullary rod 50 is assembled with the first rod connecting part 11 of the femoral component 10, after the first intramedullary rod 50 and the femoral component 10 are assembled, the first fixed part 61 of the first limiting part 60 is screwed in along the direction of the first fixed hole 13 of the femoral component 10, finally the first anti-return column 62 of the first limiting part 60 enters the first anti-return groove 53 of the first intramedullary rod 50, the assembled femoral component 10 and the first intramedullary rod 50 are implanted into the femoral intramedullary canal, and the groove and the ridge on the intramedullary part 52 of the first intramedullary rod 50 can be meshed with the femoral intramedullary canal.
The second step is that: assembled tibial component
The same with the femur side, the intramedullary canal of the tibia is processed by using a special intramedullary reamer, the diameter and the length of the second intramedullary rod 70 which can be matched with the intramedullary canal of the tibia are selected, then the fixed part of the selected second intramedullary rod 70 is assembled with the second rod connecting part 21 of the tibia component 20, after the second intramedullary rod 70 and the tibia component 20 are assembled, the second fixed part of the second limiting part 80 is screwed in along the direction of the second fixed hole 23 of the tibia component 20, finally the second anti-return column of the second limiting part 80 enters the second anti-return groove of the second intramedullary rod 70, the assembled tibia component 20 and the second intramedullary rod 70 are implanted into the intramedullary canal of the tibia, and the groove and the ridge on the intramedullary part of the second intramedullary rod 70 can be meshed with the intramedullary canal of the tibia.
The third step: connecting femoral and tibial components
After the femoral component 10 and the tibial component 20 are assembled respectively, the femoral component 10 and the tibial component 20 are drawn closer, a part of the structure of the second femoral shank connecting part 22 of the tibial component 20 is inserted into the clamping groove 14 on the first femoral shank connecting part 12 of the femoral component 10, the first connecting hole 15 on the first femoral shank connecting part 12 of the femoral component 10 is aligned with the second connecting hole 25 on the second femoral shank connecting part 22 of the tibial component 20, then the first connecting element 30 is inserted into the aligned first connecting hole 15 and the aligned second connecting hole 25, the limiting groove 31 of the first connecting element 30 is aligned with the third connecting hole 26 on the second femoral shank connecting part 22 of the tibial component 20, finally the guiding conical head 42 of the second connecting element 40 is aligned with the third connecting hole 26 on the second femoral shank connecting part 22 of the tibial component 20, the striking groove 44 of the second connecting element 40 is struck by a special tool, the fixing shaft 41 of the second coupling element 40 is inserted into the third connecting hole 26 of the second thigh shank connecting portion 22 of the shank component 20 until the positioning boss 45 of the second coupling element 40 is fitted to the first stopper surface 27 of the second thigh shank connecting portion 22 of the shank component 20, and the anti-back boss 43 of the second coupling element 40 is beyond the second stopper surface 28 of the second thigh shank connecting portion 22 of the shank component 20, so that the anti-back boss 43 of the second coupling element 40 is prevented from being removed by the second stopper surface 28 of the second thigh shank connecting portion 22 of the shank component 20.
The first rod 50 and the femoral component 10 and the second rod 70 and the tibial component 20 may be connected by taper locking or by screw threads. The parts are made of biological medical materials, and the surfaces of the parts can also be subjected to surface treatment processes, such as sand blasting, plasma spraying and the like.
Use the technical scheme of the utility model, first thigh shin connecting portion 12 and second thigh shin connecting portion 22 adopt the mode of joint to connect, can carry out spacing cooperation better, it is fixed with first thigh shin connecting portion 12 and second thigh shin connecting portion 22 through first connecting piece 30, and carry out spacingly to first connecting piece 30 through second connecting piece 40, can avoid first connecting piece 30 to deviate from first thigh shin connecting portion 12 or second thigh shin connecting portion 22, thereby avoided taking place the problem that the pine takes off, the reliability of femoral component 10 and tibial component 20 long-term connection has been improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A knee fusion prosthesis, comprising:
the bone fracture plate comprises a femoral component (10), a tibial component (20), a first intramedullary rod (50), a second intramedullary rod (70), a first connecting piece (30) and a second connecting piece (40), wherein the first intramedullary rod (50) is fixedly connected with a femur, and the second intramedullary rod (70) is fixedly connected with a tibia;
the femoral component (10) comprises a first rod connection part (11) and a first femoral shank connection part (12) which are connected with each other, the first rod connection part (11) is used for being fixedly connected with the first intramedullary rod (50), and the first femoral shank connection part (12) is provided with a clamping groove (14);
the tibia component (20) comprises a second rod connecting part (21) and a second femoral tibia connecting part (22) which are connected with each other, the second rod connecting part (21) is used for being fixedly connected with the second intramedullary rod (70), and at least part of structure of the second femoral tibia connecting part (22) is located in the clamping groove (14) and is in limit fit with the inner wall of the clamping groove (14);
the first connecting piece (30) is arranged in the first femoral shank connecting part (12) and the second femoral shank connecting part (22) in a penetrating mode so as to fixedly connect the first femoral shank connecting part (12) and the second femoral shank connecting part (22);
the second connecting element (40) is arranged in the second thigh-shank connecting part (22) in a penetrating mode, and the second connecting element (40) is in limit fit with the first connecting element (30) and the second thigh-shank connecting part (22) respectively so as to prevent the first connecting element (30) from being pulled out of the first thigh-shank connecting part (12) or the second thigh-shank connecting part (22).
2. The knee fusion prosthesis of claim 1, wherein the first connecting member (30) has a retaining groove (31), and a portion of the second connecting member (40) is configured to be positioned in the retaining groove (31) to retain the first connecting member (30) in a lengthwise direction.
3. The knee fusion prosthesis of claim 2, wherein the first connecting member (30) has a cylindrical structure, the limiting groove (31) extends in a direction perpendicular to the axial direction of the first connecting member (30), and the second connecting member (40) has a length direction perpendicular to the length direction of the first connecting member (30).
4. The knee fusion prosthesis of claim 1, wherein the second coupling element (40) includes a fixing shaft (41), a positioning boss (45) and a withdrawal prevention boss (43), the positioning boss (45) and the withdrawal prevention boss (43) are respectively disposed at both ends of the fixing shaft (41), a diameter of the fixing shaft (41) is smaller than a radial dimension of the positioning boss (45) and a radial dimension of the withdrawal prevention boss (43), the fixing shaft (41) is inserted into the second femoral tibia connecting portion (22) and is in limit fit with the first coupling element (30), the positioning boss (45) is in limit fit with one side of the second femoral tibia connecting portion (22), and the positioning boss (45) is in limit fit with the other side of the second femoral tibia connecting portion (22).
5. Knee fusion prosthesis according to claim 4, characterized in that the second attachment element (40) is made of an elastic material, the anti-back boss (43) having a radial dimension smaller than the radial dimension of the positioning boss (45), the second attachment element (40) further comprising a guiding cone (42), the guiding cone (42) being connected with the anti-back boss (43).
6. The knee fusion prosthesis according to claim 4, characterized in that one side of the second femoral shank connecting portion (22) has a first limit surface (27), the other side of the second femoral shank connecting portion (22) has a second limit surface (28), the first limit surface (27) and the second limit surface (28) are arranged in parallel with each other, the positioning boss (45) is in limit fit with the first limit surface (27), and the anti-receding boss (43) is in limit fit with the second limit surface (28).
7. The knee fusion prosthesis of claim 1, wherein the second femoral tibial connection portion (22) has first and second spaced apart grooves (24, 29), the first groove (24) having a first sidewall and the second groove (29) having a second sidewall, the second femoral tibial connection portion (22) structure between the first and second sidewalls being located within the socket (14), the socket (14) having a third sidewall in positive engagement with the first sidewall, a fourth sidewall in positive engagement with the second sidewall, and a first groove bottom in positive engagement with the end face of the second femoral tibial connection portion (22).
8. The knee fusion prosthesis of claim 7,
the first groove (24) further has a fifth side wall, a sixth side wall and a second groove bottom, the second groove (29) further has a seventh side wall, an eighth side wall and a third groove bottom;
the first thigh-shank connecting part (12) comprises a first split body and a second split body which are arranged on the first rod connecting part (11) at intervals, the clamping groove (14) is positioned between the first split body and the second split body, the first connecting piece (30) sequentially penetrates through the first split body, the second thigh-shank connecting part (22) and the second split body, the first split body is provided with a ninth side wall, a tenth side wall and a first top wall, and the second split body is provided with an eleventh side wall, a twelfth side wall and a second top wall;
the first component is positioned in the first groove (24), the ninth side wall is in limit fit with the fifth side wall, the tenth side wall is in limit fit with the sixth side wall, and the first top wall is in limit fit with the second groove bottom;
the second split body is located in the second groove (29), the eleventh side wall is in limit fit with the seventh side wall, the twelfth side wall is in limit fit with the eighth side wall, and the second top wall is in limit fit with the third groove bottom.
9. The knee fusion prosthesis of claim 1, wherein the first rod connecting portion (11) is detachably connected to the first intramedullary rod (50), the second rod connecting portion (21) is detachably connected to the second intramedullary rod (70), the knee fusion prosthesis further comprises a first limiting member (60) and a second limiting member (80), the first limiting member (60) is disposed on the first rod connecting portion (11) and is in limiting fit with the first intramedullary rod (50), and the second limiting member (80) is disposed on the second rod connecting portion (21) and is in limiting fit with the second intramedullary rod (70).
10. The knee fusion prosthesis of claim 9,
the first intramedullary rod (50) is provided with a first stopping groove (53), the first limiting part (60) comprises a first fixing part (61) and a first stopping column (62) arranged on the first fixing part (61), one end of the first intramedullary rod (50) is arranged in the first rod connecting part (11) in a penetrating manner, the first stopping groove (53) is positioned in the first rod connecting part (11), the first fixing part (61) is arranged in the first rod connecting part (11) in a penetrating manner, and the first stopping column (62) is positioned in the first stopping groove (53) to limit the first intramedullary rod (50);
second intramedullary pole (70) have the second stopping groove, second locating part (80) include the second mounting and set up second stopping post on the second mounting, the one end of second intramedullary pole (70) is worn to establish in second pole connecting portion (21) just the second stopping groove is located in second pole connecting portion (21), the second mounting is worn to establish in second pole connecting portion (21), the second stopping post is located in the second stopping groove is in order to be right second intramedullary pole (70) carry on spacingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921549149.XU CN211156486U (en) | 2019-09-17 | 2019-09-17 | Knee joint fusion prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921549149.XU CN211156486U (en) | 2019-09-17 | 2019-09-17 | Knee joint fusion prosthesis |
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| Publication Number | Publication Date |
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| CN211156486U true CN211156486U (en) | 2020-08-04 |
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| CN201921549149.XU Active CN211156486U (en) | 2019-09-17 | 2019-09-17 | Knee joint fusion prosthesis |
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| CN (1) | CN211156486U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538009A (en) * | 2019-09-17 | 2019-12-06 | 北京爱康宜诚医疗器材有限公司 | Knee joint fusion prosthesis |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538009A (en) * | 2019-09-17 | 2019-12-06 | 北京爱康宜诚医疗器材有限公司 | Knee joint fusion prosthesis |
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