Knee prosthesis

Abstract

The application discloses a knee joint prosthesis, and relates to the technical field of medical devices, which comprises a detachably connected tibial pad and tibial support, and a gap is left between the tibial pad and the tibial support; a first connecting part is detachably connected to one end of the tibial pad close to the tibial support, a second connecting part is detachably connected to one end of the tibial support close to the tibial pad, and a wear-resistant part is arranged between the first connecting part and the second connecting part; the wear-resistant part is rotationally connected with the first connecting part, the first connecting part can be tightened or expanded relative to the wear-resistant part, and is used for adjusting the tightness degree of contact with the wear-resistant part; and an elastic piece is arranged between the wear-resistant part and the second connecting part. The application has the effects of reducing the wear degree of the knee joint prosthesis and simultaneously reducing the replacement cost.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and in particular to a knee joint prosthesis. Background Technology

[0002] Joint replacement surgery is considered by the medical community to be a revolutionary surgery of the 21st century. For patients with end-stage knee joint disease, knee replacement surgery can effectively relieve pain, restore mobility, and improve quality of life by implanting an artificial joint prosthesis to replace the diseased bone.

[0003] A knee prosthesis typically consists of a femoral condyle, a tibial platen, a tibial support, and a patellar prosthesis. The prosthesis mimics the structure of a normal human knee joint. The femoral condyle is fixed to the end of the femur, the tibial support to the end of the tibia, and a meniscus-like tibial platen is implanted between the femoral and tibial joints. The fit between the femoral condyle and the tibial platen is high, allowing the femoral condyle to move relative to the tibial platen, thus reducing contact stress on the prosthesis.

[0004] However, in typical fixed-platform knee prostheses, the tibial pad and tibial support are in relatively fixed positions. The cushioning is provided only by the slight deformation of the tibial pad material itself, which can cause significant wear and tear on the tibial pad. Furthermore, the entire tibial pad needs to be scrapped during replacement, resulting in high replacement costs. Summary of the Invention

[0005] In order to improve the situation where tibial pads are prone to wear and tear during use and have high replacement costs, this application provides a knee joint prosthesis.

[0006] This application provides a knee joint prosthesis, which adopts the following technical solution: A knee joint prosthesis includes a detachably connected tibial pad and a tibial support, with a gap between the tibial pad and the tibial support; The tibial pad is detachably connected to a first connecting part at one end near the tibial support, and the tibial support is detachably connected to a second connecting part at one end near the tibial pad. A wear-resistant part is provided between the first connecting part and the second connecting part. The wear-resistant part is rotatably connected to the first connecting part, and the first connecting part can tighten or expand relative to the wear-resistant part to adjust the tightness of the contact with the wear-resistant part. An elastic element is provided between the wear-resistant part and the second connecting part.

[0007] By adopting the above technical solution, a first connecting part is detachably connected to the end of the tibial pad near the tibial support, and a second connecting part is detachably connected to the end of the tibial support near the tibial pad. The connection between the tibial pad and the tibial support is achieved through the corresponding connection of the first and second connecting parts. A wear-resistant part is provided between the first and second connecting parts, and the wear-resistant part is rotatably connected to the first connecting part. Simultaneously, an elastic element is provided between the wear-resistant part and the second connecting part, allowing the tibial pad as a whole to rotate relative to the tibial support, and maintaining a gap between the tibial pad and the tibial support to prevent direct contact. Due to the presence of the elastic element, the tibial pad can rotate relative to the tibial support, preventing direct contact. This design allows for elastic displacement of the tibial pad relative to the tibial support, effectively reducing wear between knee joint prosthesis components and extending the prosthesis's lifespan. Simultaneously, the first connecting part can tighten or expand relative to the wear-resistant part, allowing for flexible adjustment of the contact tightness between the first connecting part and the wear-resistant part according to different patients' usage, facilitating the installation of prosthesis components. Furthermore, due to the detachable connection between the first connecting part and the tibial pad, when wear between the first connecting part and the wear-resistant part is severe, only the first connecting part and the wear-resistant part need to be replaced, without needing to replace the entire tibial pad, effectively saving on replacement material costs.

[0008] Optionally, the first connecting part includes a limiting member and an abutment block. The tibial pad has a first groove at one end near the tibial support. The limiting member is detachably connected to the first groove. The limiting member has a second groove at one end near the tibial support. A clearance groove is formed through the side wall of the limiting member corresponding to the second groove. The abutment block is slidably connected to the clearance groove. The wear-resistant part is located in the second groove. The abutment block is arranged around the wear-resistant part. The abutment block can move towards or away from the wear-resistant part. The outer side wall of the wear-resistant part can abut against the abutment block and is slidably connected to the abutment block.

[0009] By adopting the above technical solution, the first connecting part includes a limiting member and an abutment block. The tibial pad has a first groove at one end near the tibial support, and the limiting member is detachably connected to the first groove. At the same time, the limiting member has a second groove at one end near the tibial support, and the wear-resistant part is located in the second groove. The side wall of the limiting member corresponding to the second groove has a clearance groove. The abutment block is slidably connected in the clearance groove and is arranged around the wear-resistant part. The abutment block can move towards or away from the wear-resistant part. When it is necessary to install or remove the wear-resistant part, the abutment block moves away from the wear-resistant part, and the gap between the abutment block and the wear-resistant part increases, making it easier to remove the wear-resistant part. When it is necessary to fix the position of the wear-resistant part, the abutment block moves towards the wear-resistant part until it abuts against the wear-resistant part. The tightness of the contact between the abutment block and the wear-resistant part can be adjusted according to the actual situation of the patient.

[0010] Optionally, an adjusting bolt is provided at the end of the abutment block away from the wear-resistant part. The adjusting bolt passes through the tibial pad and is used to drive the abutment block to move towards or away from the wear-resistant part. The tibial pad has a through hole corresponding to the position of the adjusting bolt for the adjusting bolt to pass through.

[0011] By adopting the above technical solution, an adjusting bolt is provided at the end of the abutment block away from the wear-resistant part. The adjusting bolt passes through the tibial pad. The tibial pad has a through hole corresponding to the position of the adjusting bolt for the adjusting bolt to pass through. One end of the adjusting bolt passes through the through hole into the tibial pad and is fixed to the abutment block. By controlling the degree of screwing in of the adjusting bolt, the movement of the abutment block can be controlled, which is convenient for medical staff to operate.

[0012] Optionally, along the direction from the tibial pad to the tibial support, the inner diameters of the first groove and the second groove gradually decrease, the outer diameter of the wear-resistant part corresponds to the inner diameter of the second groove, and a stop protrusion is provided around the edge of the wear-resistant part near the end of the tibial support, the stop protrusion being able to abut against the end face of the abutment block near the end of the tibial support.

[0013] By adopting the above technical solution, along the direction from the tibial pad to the tibial support, the inner diameters of both the first and second grooves gradually decrease. The outer diameter of the wear-resistant part corresponds to the inner diameter of the second groove. A stop protrusion is provided around the edge of the wear-resistant part near the tibial support, and the stop protrusion can abut against the end face of the abutment block near the tibial support. Because the inner diameter of the second groove gradually decreases, when the tibial pad moves away from the tibial support, the outer diameter of the wear-resistant part near the tibial pad is larger than the inner diameter of the second groove at this point, thus limiting... The sidewall of the retaining element abuts against the outer wall of the wear-resistant part, creating a stopping effect on the wear-resistant part. When the tibial pad moves towards the tibial support, the stopping protrusion abuts against the end face of the abutting block near the tibial support, restricting the movement of the abutting block towards the tibial support, thereby restricting the movement of the tibial pad. At the same time, due to the action of the elastic element between the wear-resistant part and the second connecting part, the wear-resistant part and the second connecting part are in elastic contact, which can reduce the wear between the tibial pad and the tibial support and improve the patient's user experience.

[0014] Optionally, the limiting member has a gap between the top wall of the second groove and the wear-resistant part, and an elastic element is provided at the gap.

[0015] By adopting the above technical solution, a gap is left between the top wall of the limiting member in the second groove and the wear-resistant part, which reduces the contact between the wear-resistant part and the limiting member, further reducing wear. In addition, an elastic member is provided at the gap, which can provide a certain buffering effect when there is a close movement between the limiting member and the wear-resistant part.

[0016] Optionally, the tibial support includes a tibial platform and a fixing post. The shape of the tibial platform corresponds to the tibial pad. The second connecting component is detachably connected to the end of the tibial platform near the tibial pad. The fixing post is located at the end of the tibial platform away from the tibial pad and is used to fix it to the tibia of the human body.

[0017] By adopting the above technical solution, the tibial support includes a tibial platform and a fixing column. The fixing column is used to fix the tibia of the human body and provide reliable support for the tibial platform. The second connecting part is detachably connected to the end of the tibial platform near the tibial pad. When the wear between the second connecting part and the wear-resistant part is more severe, the second connecting part can be replaced separately, effectively reducing the workload of medical staff.

[0018] Optionally, the second connecting part includes a fixing ring and a connecting platform. The fixing ring is detachably connected to the tibial plateau, and the connecting platform passes through the fixing ring and is detachably connected to the fixing ring. The outer diameter of the connecting platform gradually decreases along the direction from the tibial pad to the tibial support. The wear-resistant part has a third groove with an inner diameter corresponding to the outer diameter of the connecting platform at one end near the tibial support. The connecting platform is inserted into the third groove, and the elastic element is located between the connecting platform and the wear-resistant part.

[0019] By adopting the above technical solution, the second connecting part includes a fixing ring and a connecting platform. The fixing ring is detachably connected to the tibial plateau, and the connecting platform passes through the fixing ring and is detachably connected to the fixing ring. The presence of the fixing ring provides support for the detachable installation of the connecting platform. The outer diameter of the connecting platform gradually decreases along the direction from the tibial pad to the tibial support. A third groove with an inner diameter corresponding to the outer diameter of the connecting platform is opened at the end of the wear-resistant part near the tibial support. The connecting platform is inserted into the third groove. An elastic element is located between the connecting platform and the wear-resistant part. The gradual decrease in the inner diameter of the third groove and the outer diameter of the connecting platform prevents the wear-resistant part from falling out when moving away from the connecting platform. The elastic element provides elastic support for the wear-resistant part when moving close to the connecting platform.

[0020] Optionally, a guide post is provided between the tibial pad and the tibial plateau. A groove is provided at one end of the tibial pad near the tibial plateau. One end of the guide post is detachably connected to the tibial plateau, and the other end is slidably connected to the groove.

[0021] By adopting the above technical solution, a guide post is provided between the tibial pad and the tibial plateau. One end of the guide post is detachably connected to the tibial plateau. A groove is opened at the end of the tibial pad near the tibial plateau. The end of the guide post away from the tibial plateau is slidably connected to the groove. When the tibial pad rotates relative to the tibial plateau, the end of the guide post is slidably connected to the groove, which can provide guidance for the sliding of the tibial pad and reduce the situation of the tibial pad deviating after rotation.

[0022] Optionally, the guide post is provided with buffers at both ends along its length. One end of the buffer abuts against the guide post, and the other end of the buffer away from the guide post abuts against the tibial pad or the tibial plateau.

[0023] By adopting the above technical solution, buffers are provided at both ends of the guide post along its length. One end of the buffer abuts against the guide post, and the other end abuts against the tibial pad or the tibial plateau respectively. When the tibial pad and the tibial plateau move close to each other, the buffer can provide a certain buffering effect for the movement of the tibial pad and the tibial plateau, reducing the direct contact between the tibial pad and the tibial plateau.

[0024] Optionally, an anti-dislodgement baffle is provided at the edge of the tibial support near one end of the tibial pad. The anti-dislodgement baffle surrounds the tibial pad, and a groove is provided on the inner side wall of the anti-dislodgement baffle. A protrusion is provided on the side wall of the tibial pad at the position corresponding to the groove, and the protrusion is slidably connected in the groove.

[0025] By adopting the above technical solution, an anti-dislodgement baffle is provided around the edge of the tibial support near the tibial pad. The inner side wall of the anti-dislodgement baffle has a groove, and the side wall of the tibial pad has a protrusion at the position corresponding to the groove. The protrusion is slidably connected in the groove. When the tibial pad moves relative to the tibial plateau, the anti-dislodgement baffle can restrict the movement of the tibial pad within the tibial plateau, so that the tibial pad does not disengage from the tibial plateau during the movement.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. By detachably connecting a first connecting part to the tibial pad and a second connecting part to the tibial platform, and providing a wear-resistant part between the first connecting part and the second connecting part, the first connecting part and the wear-resistant part can rotate relative to each other, which can reduce wear between the prosthesis joints. After the prosthesis joints are worn, the first connecting part and the second connecting part can be replaced separately, which is convenient for medical staff to replace and also effectively reduces the cost of replacing the prosthesis. 2. By setting an abutment block that can slide relative to the limiting component, and at the same time setting an adjusting bolt at one end of the wear-resistant part of the abutment block, the tightness of the contact between the abutment block and the wear-resistant part can be adjusted, so that the fit of the prosthesis is better. 3. By setting a guide post between the tibial pad and the tibial plateau, the guide post can guide the rotation of the tibial pad when the tibial pad rotates relative to the tibial plateau, reducing the deviation of the movement between the tibial pad and the tibial plateau. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram illustrating the structure of the first connecting part and the second connecting part according to an embodiment of this application; Figure 2 This is a partial schematic diagram illustrating the abutment block structure in an embodiment of this application; Figure 3 yes Figure 1 An enlarged view at point A; Figure 4 This is an overall schematic diagram illustrating the guide post connection structure in an embodiment of this application; Figure 5 This is a partial schematic diagram illustrating the anti-detachment baffle structure in an embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Tibial pad; 11. First groove; 12. Through hole; 13. Protrusion; 14. Slide groove; 2. Tibial support; 21. Tibial platform; 22. Fixing post; 23. Anti-dislodgement baffle; 231. Slot; 3. First connecting part; 31. Limiting element; 311. Second groove; 312. Relief groove; 32. Abutment block; 33. Adjusting bolt; 4. Wear-resistant part; 41. Third groove; 42. Stopping protrusion; 5. Second connecting part; 51. Fixing ring; 52. Connecting platform; 6. Elastic element; 7. Guide post; 71. Buffer element. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0030] This application discloses a knee joint prosthesis, which is described in the embodiments below. Figure 1 A knee joint prosthesis includes a detachably connected tibial pad 1 and a tibial support 2, with a gap between the tibial pad 1 and the tibial support 2. The tibial support 2 includes a tibial plateau 21 and a fixation post 22. The tibial pad 1 is installed at one end of the tibial plateau 21, and the fixation post 22 is fixed to the end of the tibial plateau 21 away from the tibial pad 1. During installation, the fixation post 22 is inserted and fixed to one end of the patient's tibia, providing reliable support for the tibial plateau 21. The end of the tibial pad 1 away from the tibial plateau 21 is used to contact the femoral prosthesis, ensuring the complete functionality of the knee joint prosthesis and meeting the patient's joint movement needs.

[0031] A first groove 11 is formed at one end of the tibial pad 1 near the tibial plateau 21. The inner diameter of the first groove 11 gradually decreases along the direction from the tibial pad 1 to the tibial plateau 21, so that the first groove 11 is in a gradually contracting state. A first connecting part 3 is provided in the first groove 11. The first connecting part 3 includes a limiting member 31, an abutment block 32, and an adjusting bolt 33. The limiting member 31 is engaged in the first groove 11. The outer diameter of the limiting member 31 corresponds to the inner diameter of the first groove 11, and it also gradually decreases along the direction from the tibial pad 1 to the tibial plateau 21.

[0032] Reference Figure 1 and Figure 2The end face of the limiting member 31 near the tibial plateau 21 does not exceed the end face of the tibial pad 1. A second groove 311 is formed at the end of the limiting member 31 near the tibial plateau 21. The inner diameter of the second groove 311 gradually decreases along the direction from the tibial pad 1 to the tibial plateau 21, and is in a contracted state like the first groove 11, with the degree of contraction corresponding to the first groove 11. A relief groove 312 is formed on the side wall of the limiting member 31 at the second groove 311. An abutment block 32 is slidably connected to the limiting member 31 in the relief groove 312. The abutment block 32 gradually shifts towards the center of the limiting member 31 along the direction from the tibial pad 1 to the tibial plateau 21. The second groove 311 is provided with a wear-resistant part 4. The outer diameter of the wear-resistant part 4 corresponds to the inner diameter of the second groove 311. Similarly, it gradually decreases along the direction from the tibial pad 1 to the tibial plateau 21. The abutment block 32 can move along the relief groove 312 towards or away from the wear-resistant part 4. The abutment block 32 is arranged around the wear-resistant part 4 and can contact the wear-resistant part 4. While contacting the wear-resistant part 4, it can also slide relative to the wear-resistant part 4.

[0033] The end of the abutment block 32 furthest from the wear-resistant part 4 is threadedly connected to the adjusting bolt 33. Each adjusting bolt 33 corresponds to one abutment block 32 and is positioned perpendicular to the length of the fixing post 22. A through hole 12 is provided through the tibial pad 1, and the adjusting bolt 33 passes through the through hole 12 and is fixed to the abutment block 32. In other embodiments of this application, a cap may be provided in the through hole 12 furthest from the abutment block 32. The cap is detachably connected to the tibial pad 1, and the cap provides a relative seal to the adjusting bolt 33.

[0034] When it is necessary to adjust the tightness between the abutment block 32 and the wear-resistant part 4, the adjusting bolt 33 can be screwed in forward or out backward, causing the adjusting bolt 33 to move the abutment block 32 closer to or further away from the wear-resistant part 4. At the same time, the positioning groove 312 provides guidance for the movement of the abutment block 32, reducing the possibility of the abutment block 32 shifting during movement. When it is necessary to install or remove the wear-resistant part 4, the abutment block 32 moves away from the wear-resistant part 4, increasing the gap between the abutment block 32 and the wear-resistant part 4, making it easier to remove the wear-resistant part 4. When it is necessary to fix the position of the wear-resistant part 4, the abutment block 32 moves closer to the wear-resistant part 4 until it abuts against the wear-resistant part 4. The tightness of the contact between the abutment block 32 and the wear-resistant part 4 can be adjusted according to the actual situation of different patients to adjust the relative sliding between the abutment block 32 and the wear-resistant part 4.

[0035] Reference Figure 1 and Figure 2A stop protrusion 42 is provided around the edge of the wear-resistant part 4 near the tibial plateau 21. The stop protrusion 42 is integrally formed with the wear-resistant part 4 and abuts against the end face of the abutment block 32 near the tibial support 2. Because the inner diameter of the second groove 311 gradually decreases, when the tibial pad 1 moves away from the tibial support 2 during exercise, the outer diameter of the wear-resistant part 4 near the tibial pad 1 is larger than the inner diameter of the second groove 311, so that the side wall of the limiting member 31 abuts against the outer wall of the wear-resistant part 4, forming a stopping effect on the tibial pad 1; when the tibial pad 1 moves towards the tibial support 2, the stop protrusion 42 abuts against the end face of the abutment block 32 near the tibial support 2, and the stop protrusion 42 provides a supporting force to the abutment block 32 towards the tibial pad 1, thereby restricting the movement of the tibial pad 1.

[0036] A third groove 41 is formed at one end of the wear-resistant part 4 near the tibial plateau 21. The inner diameter of the third groove 41 corresponds to the outer diameter of the wear-resistant part 4, and gradually decreases along the direction from the tibial pad 1 to the tibial plateau 21, exhibiting a contracted state. Simultaneously, a second connecting part 5 is detachably connected to one end of the tibial plateau 21 near the tibial pad 1. The second connecting part 5 includes a fixing ring 51 and a connecting platform 52. The fixing ring 51 is engaged with the tibial plateau 21, and its end face is flush with the end face of the tibial plateau 21. An internal thread is coaxially provided inside the fixing ring 51. The connecting platform 52 has an external thread at one end near the tibial plateau 21. One end of the connecting platform 52 is fixed to the fixing ring 51 via a threaded connection, and the other end is placed in the third groove 41. The outer diameter of the connecting platform 52 corresponds to the inner diameter of the third groove 41, and also gradually decreases along the direction from the tibial pad 1 to the tibial plateau 21. When the tibial pad 1 moves away from the tibial support 2, the wear-resistant part 4 moves away from the tibial support 2 along with the tibial pad 1. The outer diameter of the connecting platform 52 near the end of the tibial pad 1 is larger than the inner diameter of the third groove 41 at this point, so that the inner wall of the wear-resistant part 4 abuts against the outer wall of the connecting platform 52, forming a stopping effect on the wear-resistant part 4.

[0037] An elastic element 6 is provided between the limiting member 31 and the wear-resistant part 4. The elastic element 6 is engaged with the top wall of the limiting member 31 located in the second groove 311. This elastic element 6 abuts against both the limiting member 31 and the wear-resistant part 4. Simultaneously, an elastic element 6 is also provided between the wear-resistant part 4 and the connecting platform 52. This elastic element 6 abuts against both the wear-resistant part 4 and the connecting platform 52. The elastic element can be an elastic gasket. Due to the function of the elastic element 6, the wear-resistant part 4 makes elastic contact with both the limiting member 31 and the connecting platform 52. When the wear-resistant part 4 moves relative to the tibial pad 1 or the tibial support 2, it can reduce the wear between the wear-resistant part 4 and the tibial pad 1 or the tibial support 2, and also improve the patient's comfort during use. Furthermore, if the abutment block 32 or the wear-resistant part 4 experiences severe wear at the point of relative friction, the abutment block 32 or the wear-resistant part 4 can be replaced individually without scrapping the entire tibial pad 1, effectively saving replacement material costs.

[0038] Reference Figure 1 and Figure 3 A guide post 7 is provided between the tibial pad 1 and the tibial plateau 21. One end of the guide post 7 is detachably connected to the tibial plateau 21, and the other end is slidably connected to the tibial pad 1. The detachable connection can be a snap-fit ​​connection.

[0039] Reference Figure 3 and Figure 4 The tibial pad 1 has a groove 14 at one end near the tibial plateau 21. The groove 14 is arc-shaped and corresponds to the position of the guide post 7. The end of the guide post 7 away from the tibial plateau 21 is slidably connected to the groove 14. When the tibial pad 1 rotates relative to the tibial plateau 21, the guide post 7 is slidably connected to the groove 14, which can guide the sliding of the tibial pad 1 and reduce the possibility of the tibial pad 1 shifting after rotation.

[0040] Both ends of the guide post 7 along its length are fixed with buffer elements 71, which can also be elastic pads. One end of the buffer element 71 abuts against the guide post 7, and the other end abuts against the tibial pad 1 or the tibial plateau 21 respectively. When the tibial pad 1 and the tibial plateau 21 move close to each other, the buffer element 71 can provide a certain cushioning effect for the movement of the tibial pad 1 and the tibial plateau 21, reducing the direct contact between the tibial pad 1 and the tibial plateau 21. At the same time, the buffer element 71 can be provided with various thicknesses so that it can be replaced according to different usage conditions.

[0041] Reference Figure 5A tibial plateau 21 is provided with an anti-dislodgement baffle 23 surrounding the tibial pad 1 at one edge near the tibial pad 1. The inner sidewall of the anti-dislodgement baffle 23 has a groove 231, and a protrusion 13 is fixed on the sidewall of the tibial pad 1 at the position corresponding to the groove 231. The protrusion 13 is slidably connected in the groove 231. When the tibial pad 1 moves relative to the tibial plateau 21, the anti-dislodgement baffle 23 can restrict the movement of the tibial pad 1 within the tibial plateau 21, so that the tibial pad 1 does not detach from the tibial plateau 21 during the movement.

[0042] The implementation principle of a knee joint prosthesis according to an embodiment of this application is as follows: The limiting member 31 is detachably connected to the tibial pad 1. Depending on the patient's different usage conditions, the abutment block 32 can move towards or away from the wear-resistant part 4 by adjusting the screwing degree of the bolt 33, thereby tightening or loosening with the wear-resistant part 4. This facilitates the installation of the wear-resistant part 4 or the adjustment of the tightness between the abutment block 32 and the wear-resistant part 4. The abutment block 32 and the wear-resistant part 4 can slide relative to each other, allowing the tibial pad 1 to rotate slightly relative to the tibial plateau 21. This allows the knee joint prosthesis to rotate, reducing the contact stress of the knee joint and thus reducing the stress between the joints. To reduce wear and tear and effectively extend the life of the prosthesis, elastic members 6 are provided between the limiting member 31 and the wear-resistant part 4, and between the wear-resistant part 4 and the connecting platform 52. This ensures that the wear-resistant part 4 is in elastic contact with both the limiting member 31 and the connecting platform 52, reducing wear between the wear-resistant part 4 and the tibial pad 1 or the tibial support 2. The second groove 311 and the third groove 41 gradually decrease in size along the direction from the tibial pad 1 to the tibial plateau 21, causing the inner wall of the abutment block 32 to abut against the outer wall of the wear-resistant part 4, thus creating a stopping effect on the abutment block 32. At the same time, the inner wall of the wear-resistant part 4 abuts against the outer wall of the connecting platform 52, creating a stopping effect on the wear-resistant part 4.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A knee joint prosthesis, characterized in that: It includes a detachably connected tibial pad (1) and a tibial support (2), with a gap between the tibial pad (1) and the tibial support (2); The tibial pad (1) is detachably connected to a first connecting part (3) at one end near the tibial support (2), and the tibial support (2) is detachably connected to a second connecting part (5) at one end near the tibial pad (1). A wear-resistant part (4) is provided between the first connecting part (3) and the second connecting part (5). The wear-resistant part (4) is rotatably connected to the first connecting part (3). The first connecting part (3) can tighten or expand relative to the wear-resistant part (4) to adjust the tightness of contact with the wear-resistant part (4). An elastic element (6) is provided between the wear-resistant part (4) and the second connecting part (5).

2. The knee joint prosthesis according to claim 1, characterized in that: The first connecting part (3) includes a limiting member (31) and an abutting block (32). The tibial pad (1) has a first groove (11) at one end near the tibial support (2). The limiting member (31) is detachably connected to the first groove (11). The limiting member (31) has a second groove (311) at one end near the tibial support (2). The side wall of the limiting member (31) corresponding to the second groove (311) has a clearance groove (312) through it. The abutting block (32) is slidably connected to the clearance groove (312). The wear-resistant part (4) is located in the second groove (311). The abutting block (32) is arranged around the wear-resistant part (4). The abutting block (32) can move towards or away from the wear-resistant part (4). The outer side wall of the wear-resistant part (4) can abut against the abutting block (32) and slide with the abutting block (32).

3. A knee joint prosthesis according to claim 2, characterized in that: An adjusting bolt (33) is provided at the end of the abutment block (32) away from the wear-resistant part (4). The adjusting bolt (33) passes through the tibial pad (1) and is used to drive the abutment block (32) to move towards or away from the wear-resistant part (4). The tibial pad (1) has a through hole (12) through which the adjusting bolt (33) passes at the position corresponding to the position of the adjusting bolt (33).

4. A knee joint prosthesis according to claim 2, characterized in that: Along the direction from the tibial pad (1) to the tibial support (2), the inner diameters of the first groove (11) and the second groove (311) gradually decrease. The outer diameter of the wear-resistant part (4) corresponds to the inner diameter of the second groove (311). The edge of the wear-resistant part (4) near the end of the tibial support (2) is surrounded by a stop protrusion (42). The stop protrusion (42) can abut against the end face of the abutment block (32) near the end of the tibial support (2).

5. A knee joint prosthesis according to claim 4, characterized in that: The limiting member (31) has a gap between the top wall of the second groove (311) and the wear-resistant part (4), and an elastic member (6) is provided at the gap.

6. A knee joint prosthesis according to claim 1, characterized in that: The tibial support (2) includes a tibial platform (21) and a fixing post (22). The shape of the tibial platform (21) corresponds to that of the tibial pad (1). The second connecting part (5) is detachably connected to the end of the tibial platform (21) near the tibial pad (1). The fixing post (22) is located at the end of the tibial platform (21) away from the tibial pad (1) and is used to fix the tibia of the human body.

7. A knee joint prosthesis according to claim 6, characterized in that: The second connecting part (5) includes a fixing ring (51) and a connecting platform (52). The fixing ring (51) is detachably connected to the tibial plateau (21). The connecting platform (52) passes through the fixing ring (51) and is detachably connected to the fixing ring (51). The outer diameter of the connecting platform (52) gradually decreases along the direction from the tibial pad (1) to the tibial support (2). The wear-resistant part (4) has a third groove (41) with an inner diameter corresponding to the outer diameter of the connecting platform (52) at one end near the tibial support (2). The connecting platform (52) is inserted into the third groove (41). The elastic element (6) is located between the connecting platform (52) and the wear-resistant part (4).

8. A knee joint prosthesis according to claim 6, characterized in that: A guide post (7) is provided between the tibial pad (1) and the tibial plateau (21). A groove is provided at one end of the tibial pad (1) near the tibial plateau (21). One end of the guide post (7) is detachably connected to the tibial plateau (21), and the other end is slidably connected to the groove.

9. A knee joint prosthesis according to claim 8, characterized in that: Both ends of the guide post (7) along its length are provided with buffers (71). One end of the buffer (71) abuts against the guide post (7), and the other end of the buffer (71) away from the guide post (7) abuts against the tibial pad (1) or the tibial plateau (21).

10. A knee joint prosthesis according to claim 8, characterized in that: The tibial support (2) is provided with an anti-dislodgement baffle (23) at one end of the tibial pad (1). The anti-dislodgement baffle (23) surrounds the tibial pad (1). The inner side wall of the anti-dislodgement baffle (23) is provided with a slot (231). The side wall of the tibial pad (1) is provided with a protrusion (13) at the position corresponding to the slot (231). The protrusion (13) is slidably connected in the slot (231).

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