Patella former

Abstract

The utility model discloses a patella former which comprises patella forceps, a positioning support and an arc file. When the patella articular surface is corrected, the patella is clamped by the jaw of the patella forceps, so that the patella is fixed; the movable rod moves in the first direction, so that the projection of the file in the second direction falls onto the patella; then the filing rod moves in the second direction, and the file gets close to the patella, so that the file is in contact with the to-be-filed position of the patella; and then the patella is filed by the file so as to reach the radian required by the patella. According to the patella former, the file of the arc file is adjusted to the position, needing to be corrected, of the patella through the positioning support, the position, needing to be corrected, of the patella can be accurately filed, the filing radian is ensured, accordingly, radian matching of the patella and a femoral prosthesis is achieved, point-shaped contact of the femoral prosthesis and the patella is avoided, and the patella former is suitable for patella repair. Therefore, the smooth surface of the femoral prosthesis is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a patella shaper. Background Art

[0002] Total knee arthroplasty is an effective surgical method for treating and repairing knee joint destructive diseases. Since the patella of Chinese people is generally thin and does not completely match the patella prosthesis supplied on the market, patella replacement is not suitable. If forced replacement is carried out, it may lead to patella fracture or patellofemoral joint tension, resulting in flexion disorder, that is, abnormal pressure and friction occur between the patella and the femur, leading to patellofemoral joint tension and discomfort, so that the patient feels pain and discomfort when flexing the knee, and even affects the normal activity ability. Therefore, during total knee arthroplasty, doctors may correct the patellar articular surface of the patient into a smooth joint surface that conforms to the curvature of the femoral prosthesis to ensure the curvature of the patella and the femoral prosthesis is anastomosed, thereby improving the surgical effect and the postoperative comfort of the patient. Currently, doctors in China generally use a saw to correct the patella into an arc shape. This method is difficult to make the curvature of the patella and the femoral prosthesis anastomosed, resulting in point contact between the femoral prosthesis and the patella, thus damaging the smooth surface of the femoral prosthesis. Therefore, a patella shaper is proposed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a patella shaper to solve the above problems.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A patella shaper, comprising:

[0006] A patella clamp, the patella clamp includes a pair of jaws for clamping the patella;

[0007] A positioning bracket, including a fixed rod with one end fixed to the patella clamp and a movable rod arranged at the other end of the fixed rod, the movable rod is arranged at an angle with the fixed rod;

[0008] An arc file, including a file and a file rod, the file rod is arranged at one end of the movable rod and is arranged at an angle with the movable rod; the file is arranged at the end of the file rod close to the jaws;

[0009] Wherein, the movable rod can move relative to the fixed rod along a first direction, so that the projection of the file along a second direction falls on the patella; the file rod can move along the second direction, so that the file contacts the patella.

[0010] Optionally, the fixed rod is perpendicular to the plane where the pliers jaws are located, the included angle between the movable rod and the fixed rod is 90 degrees, and the included angle between the file rod and the movable rod is 90 degrees.

[0011] Optionally, a first connection block is provided at one end of the fixed rod away from the patella pliers, and the movable rod is connected to the fixed rod through the first connection block;

[0012] The first connection block is provided with a first through hole, the movable rod passes through the first through hole, and the movable rod can slide in the first through hole. A locking bolt is provided on the first connection block to lock the movable rod.

[0013] Optionally, a second connection block is provided at one end of the movable rod. The second connection block is provided with a second through hole. A sleeve is sleeved on the file rod. The sleeve passes through the second through hole, and the sleeve can slide in the second through hole;

[0014] The second connection block is a U-shaped block. The second through hole penetrates through the opening of the U-shaped block. A limiting block is provided on the opening of the U-shaped block. The limiting block is rotatably connected to the U-shaped block. When the limiting block rotates, it squeezes the sleeve to lock the sleeve.

[0015] Optionally, an arc-shaped guiding plate is provided on the second connection block, an arc-shaped guiding groove corresponding to the arc-shaped guiding plate is provided on the limiting block, a positioning hole is provided on the second connection block, and a limiting hole corresponding to the positioning hole is provided on the limiting block for a fixing column to pass through the positioning hole and insert into the limiting hole, thereby fixing the limiting block.

[0016] Optionally, the patella pliers further include handles, a spring piece is arranged between the two handles, and the spring piece is bolted to the handles.

[0017] Optionally, the patella shaper further includes a limiting rod. One end of the limiting rod is connected to the first handle part, the limiting rod passes through the second handle part. The limiting rod is a threaded rod, and a limiting nut is arranged on the limiting rod.

[0018] Optionally, the patella shaper further includes a femoral clamping mechanism arranged at the hinge part of the patella pliers. The femoral clamping mechanism includes a knob and a clamping rod.

[0019] Compared with the prior art, the utility model has the following beneficial effects: When correcting the patellofemoral joint surface, the patella is fixed by clamping the patella with the jaws of the patella forceps; the moving rod is moved along the first direction, so that the projection of the file along the second direction falls on the patella; then the file rod is moved along the second direction to make the file approach the patella, so as to realize the contact between the file and the position of the patella to be filed; then the file files the patella to achieve the required radian of the patella. Compared with correcting the patella with a reciprocating saw, the patella shaper disclosed by the utility model can adjust the file of the arc file to the position to be corrected of the patella through the positioning bracket, can accurately file the position to be corrected of the patella, and ensure the filing radian, so as to realize the radian anastomosis between the patella and the femoral prosthesis, avoid the point contact between the femoral prosthesis and the patella, and thus avoid the damage of the smooth surface of the femoral prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope covered by the technical content disclosed by the present utility model without affecting the effects that the present utility model can produce and the purposes that can be achieved.

[0022] Figure 1 is a schematic structural diagram of the patella shaper of the present utility model;

[0023] Figure 2 is a schematic structural diagram of the second connecting block and the limiting block separated from the present utility model.

[0024] Illustration: 10. Patella forceps; 11. Jaws; 12. Handle; 20. Positioning bracket; 21. Fixed rod; 22. Moving rod; 23. First connecting block; 24. Locking bolt; 25. Second connecting block; 251. Positioning hole; 26. Sleeve; 27. Limiting block; 271. Limiting hole; 28. Guide plate; 29. Guide groove; 30. Arc file; 31. File; 32. File rod; 41. Elastic piece; 42. Limiting rod; 43. Limiting nut; 50. Femoral clamping mechanism; 51. Knob; 52. Clamping rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the invention purpose, features and advantages of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component.

[0027] The technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific embodiments.

[0028] Refer to Figure 1 , an embodiment of the present utility model provides a patella shaper, which includes a patella clamp 10, a positioning bracket 20 and an arc file 30. The patella clamp 10 includes a jaw 11, a handle 12 and a hinge part, and the jaw 11 is used for clamping the patella. The positioning bracket 20 includes a fixed rod 21 and a moving rod 22. One end of the fixed rod 21 is fixed on the patella clamp 10. Specifically, one end of the fixed rod 21 is fixed on the hinge part of the patella clamp 10. The moving rod 22 is arranged at the end of the fixed rod 21 far from the patella clamp 10, and the moving rod 22 is arranged at an angle with the fixed rod 21. The moving rod 22 can move relative to the fixed rod 21 along a first direction. Specifically, a first connecting block 23 is arranged at the end of the fixed rod 21 far from the patella clamp 10, and the moving rod 22 is connected to the fixed rod 21 through the first connecting block 23. A first through hole is provided on the first connecting block 23, the moving rod 22 passes through the first through hole, and the moving rod 22 can slide in the first through hole. The first direction is the same as the axis direction of the first through hole, that is, the same as the length direction of the moving rod 22.

[0029] The first connecting block 23 is provided with a threaded hole, the hole axis of the threaded hole is perpendicular to the hole axis of the first through hole, and the threaded hole communicates with the first through hole. A locking bolt 24 is arranged on the threaded hole. By driving the locking bolt 24 to move towards the first through hole, the locking bolt 24 presses the moving rod 22, thereby locking the moving rod 22.

[0030] The arc-shaped file 30 includes a file 31 and a file rod 32. The file rod 32 is arranged at one end of the moving rod 22 and is arranged at an angle with the moving rod 22. The file 31 is arranged at one end of the file rod 32 close to the jaw 11. The file rod 32 can move along the second direction. Specifically, a second connecting block 25 is arranged at one end of the moving rod 22, and a second through hole is provided on the second connecting block 25. A sleeve 26 is sleeved on the file rod 32, the sleeve 26 passes through the second through hole, and the sleeve 26 can slide in the second through hole. The second direction is the same as the hole axis direction of the second through hole, that is, the same as the length direction of the file rod 32. Optionally, the sleeve 26 is fixedly connected to the file rod 32, that is, when the sleeve 26 is moved, the file rod 32 moves synchronously.

[0031] Optionally, the fixed rod 21 is perpendicular to the plane where the jaw 11 is located, the included angle between the moving rod 22 and the fixed rod 21 is 90 degrees, and the included angle between the file rod 32 and the moving rod 22 is 90 degrees.

[0032] Adjust the relative position of the file 31 relative to the patella, so that when the file 31 contacts the patella, the moving rod 22 moves along the first direction, and the projection of the file 31 along the second direction can fall on the patella; then move the file rod 32 along the second direction, and the file 31 can be made to approach the patella and contact the patella.

[0033] It should be noted that by adding the sleeve 26, the side surface of the sleeve 26 can be changed without damaging the arc-shaped file 30 to obtain the required shape.

[0034] The second connecting block 25 is a U-shaped block, and the second through hole penetrates through the opening of the U-shaped block, so that the side surface of the sleeve 26 is exposed on the opening of the U-shaped block. A limiting block 27 is arranged on the opening of the U-shaped block. The limiting block 27 is rotatably connected to the U-shaped block. After the limiting block 27 rotates, it can squeeze the sleeve 26 to lock the sleeve 26. Specifically, the limiting block 27 is an L-shaped block. Optionally, the side surface of the sleeve 26 has a flat surface. When the limiting block 27 rotates and squeezes the sleeve 26, a flat surface of the limiting block 27 fits on the flat surface on the side surface of the sleeve 26, so as to increase the contact surface between the limiting block 27 and the sleeve 26, thereby increasing the stability of the limiting block 27 after locking the sleeve 26.

[0035] An arc-shaped guiding plate 28 is arranged on the opening of the U-shaped block, and an arc-shaped guiding groove 29 corresponding to the arc-shaped guiding plate 28 is arranged on the limiting block 27. The guiding plate 28 can rotate on the guiding groove 29, so that the limiting block 27 can rotate around the second connecting block 25. A positioning hole 251 is arranged on the second connecting block 25, and a limiting hole 271 corresponding to the positioning hole 251 is arranged on the limiting block 27. When the limiting block 27 rotates and locks the sleeve 26, the limiting hole 271 is aligned with the positioning hole 251. At this time, a fixing column is used to insert into the positioning hole 251 and the limiting hole 271 at the same time, so as to fix the limiting block 27.

[0036] The patella forceps 10 further includes a handle 12. A spring piece 41 is arranged between the two handles 12. The spring piece 41 is bolted to the handle 12. When the patella forceps 10 is in a non-working state, the spring piece 41 provides tension to the handle 12, so that the handle 12 is in an open state, that is, the jaws 11 are in an open state. The patella former further includes a limiting rod 42. One end of the limiting rod 42 is connected to the first handle part. The limiting rod 42 passes through the second handle part. The limiting rod 42 is a threaded rod, and a limiting nut 43 is arranged on the limiting rod 42. The limiting nut 43 is located on the side of the second handle part away from the first handle part. When the jaws 11 clamp the patella, the limiting nut 43 is moved so that one side surface of the limiting nut 43 fits on the side surface of the second handle part away from the first handle part, so as to fix the included angle between the first handle part and the second handle part, and prevent the handle 12 from opening under the elastic force of the spring piece 41, so that the patella forceps 10 maintains the state of clamping the patella.

[0037] The described patella shaper further includes a femur clamping mechanism 50. The femur clamping mechanism 50 is disposed at the hinge portion of the patella forceps 10. The femur clamping mechanism 50 includes a knob 51 and two clamping rods 52. The two clamping rods 52 can move towards or away from each other under the screwing of the knob 51 to clamp or release the femur. Therefore, the solution of the knob 51 driving the two clamping rods 52 to move towards or away from each other is well-known in the art. For example, a gear is provided on the rotating shaft of the knob 51, and racks are connected to one ends of the two clamping rods 52. So the gear is disposed between the two racks, and the gear is meshed with the racks. The rotation of the gear drives the two racks to move towards or away from each other, thereby driving the two clamping teeth to move towards or away from each other. Therefore, this application will not elaborate.

[0038] A patella shaper disclosed by the present utility model, the specific implementation manner is as follows: When correcting the patellofemoral joint surface, the patella is fixed by clamping the patella with the jaws 11 of the patella forceps 10; the movable rod 22 is adjusted to adjust the position of the arc file 30 in the length direction of the movable rod 22, and the file rod 32 is adjusted to adjust the relative distance between the file 31 and the patella, so as to adjust the file 31 to the required working position, and then the patella is filed by the file 31 to achieve the required radian of the patella. Compared with correcting the patella by a reciprocating saw, the patella shaper disclosed by the present utility model adjusts the file 31 of the arc file 30 to the position where the patella needs to be corrected through the positioning bracket 20, can accurately file the position where the patella needs to be corrected, and ensures the filing radian, so as to achieve the radian anastomosis between the patella and the femoral prosthesis, avoid the point contact between the femoral prosthesis and the patella, and thus avoid the damage of the smooth surface of the femoral prosthesis.

[0039] As described above, the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A patellar shaping device, characterized in that: include: A patella clamp (10), the patella clamp (10) comprising a clamp mouth (11) for clamping the patella; A positioning bracket (20) comprising a fixing rod (21) having one end fixed to the patella clamp (10) and a moving rod (22) disposed on the other end of the fixing rod (21), wherein the moving rod (22) and the fixing rod (21) are disposed at an angle; An arc-shaped file (30) comprises a file (31) and a file rod (32), wherein the file rod (32) is arranged on one end of the moving rod (22) and is arranged at an angle with the moving rod (22); the file (31) is arranged at one end of the file rod (32) close to the pliers mouth (11); The movable rod (22) is movable relative to the fixed rod (21) along a first direction so as to allow the projection of the file (31) along a second direction to fall into the patella; and the file rod (32) is movable along the second direction so as to allow the file (31) to contact the patella.

2. The patellar shaping device according to claim 1, characterized in that: The fixed rod (21) is perpendicular to the plane where the pliers mouth (11) is located, the angle between the movable rod (22) and the fixed rod (21) is 90 degrees, and the angle between the file rod (32) and the movable rod (22) is 90 degrees.

3. The patellar shaping device according to claim 1, characterized in that: A first connection block (23) is provided at one end of the fixing rod (21) away from the patella clamp (10), and the moving rod (22) is connected to the fixing rod (21) via the first connection block (23); The first connecting block (23) is provided with a first through hole, the moving rod (22) passes through the first through hole, and the moving rod (22) can slide in the first through hole, and the first connecting block (23) is provided with a locking bolt (24) for locking the moving rod (22).

4. The patellar shaping device according to claim 1, characterized in that: A second connecting block (25) is provided at one end of the moving rod (22), the second connecting block (25) is provided with a second through hole, a sleeve (26) is sleeved on the file rod (32), the sleeve (26) passes through the second through hole, and the sleeve (26) can slide in the second through hole; The second connection block (25) is a U-shaped block, the second through hole passes through the opening of the U-shaped block, a limit block (27) is provided on the opening of the U-shaped block, the limit block (27) is rotatably connected to the U-shaped block, and when the limit block (27) rotates, it squeezes the sleeve to lock the sleeve (26).

5. The patellar shaping device according to claim 4, characterized in that: The second connecting block (25) is provided with an arc-shaped guide plate (28), the limiting block (27) is provided with an arc-shaped guide groove (29) corresponding to the arc-shaped guide plate (28), the second connecting block (25) is provided with a positioning hole (251), and the limiting block (27) is provided with a limiting hole (271) corresponding to the positioning hole (251), so that a fixing column can pass through the positioning hole (251) and be inserted into the limiting hole (271), thereby fixing the limiting block (27).

6. The patellar shaping device according to claim 1, characterized in that: The patella forceps (10) further comprise handles (12), a spring sheet (41) being arranged between the two handles (12), and the spring sheet (41) being connected to the handles (12) by bolts.

7. The patellar shaping device according to claim 5, characterized in that: It also comprises a limiting rod (42), one end of which is connected to the first handle portion, the limiting rod (42) passes through the second handle portion, the limiting rod (42) is a threaded rod, and a limiting nut (43) is provided on the limiting rod (42).

8. The patellar shaping device according to claim 1, characterized in that: It also comprises a femoral clamping mechanism (50) arranged at the hinged portion of the patella clamp (10), the femoral clamping mechanism (50) comprising a knob (51) and two clamping rods (52), the two clamping rods (52) being able to move towards or away from each other when the knob (51) is turned.

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