Interchangeable joint prosthesis

Abstract

The invention relates to the technical field of joint prostheses, in particular to an interchangeable joint prosthesis which comprises a thighbone prosthesis, a tibia platform and a tibia liner. The femoral prosthesis comprises a half-shell prosthesis, a first stand column, a second stand column and a bone trabecula structure. The first stand column and the second stand column are fixedly arranged on the inner wall of the half-shell prosthesis. A dismounting table is arranged on the surface of the tibia platform, a clamping groove matched with the tibia liner is formed in the surface of the tibia platform, a press-fit edge matched with the clamping groove is fixedly arranged on the surface of the tibia liner, and the tibia liner is used for supporting a thighbone prosthesis to move; a fixing wing and a fixing stand column are arranged on the surface of the other side of the tibial plateau. By arranging the thighbone prosthesis, the tibia platform and the tibia liner, the size of the joint prosthesis can be freely changed in the actual operation process, operation prosthesis selection can be conveniently adjusted in the operation, finally, the joint prosthesis is used for biological fixation, and the long-term stability of the prosthesis after implantation is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of joint prostheses, and in particular to an interchangeable joint prosthesis. Background Art

[0002] Knee replacement generally refers to knee arthroplasty, which replaces damaged articular cartilage with an artificial prosthesis. For patients with unstable, stiff, and severely impaired knees, knee replacement surgery is a relatively effective treatment method. It replaces damaged articular cartilage with an artificial prosthesis to relieve pain, correct knee deformities, and thus improve function and quality of life. Artificial prostheses are primarily made of materials such as metal, ceramic, or plastic, and can simulate normal knee joint movement and provide smoother joint function.

[0003] The tibial insert in existing knee prostheses often requires driving into the tibial plateau, which can easily cause fractures. Furthermore, removal requires considerable force to lift the insert, which can cause the plateau to loosen. Furthermore, during surgery, individual issues often necessitate resizing the femoral prosthesis or tibial plateau. By this time, the prosthesis's positioning groove has already been shaped, requiring a new groove to be opened for installation, further increasing bone defects. Current prostheses are fixed with bone cement, which has poor long-term stability.

[0004] To this end, the present application provides an interchangeable joint prosthesis. Summary of the Invention

[0005] The purpose of this application is to solve at least one technical problem raised in the background technology.

[0006] The present application provides an interchangeable joint prosthesis, comprising a femoral prosthesis, a tibial plateau and a tibial liner; The femoral prosthesis comprises a half-shell prosthesis, a first column, a second column and a trabecular structure, wherein the first column and the second column are fixedly arranged on the inner wall of the half-shell prosthesis, the number of the trabecular structures is three, the trabecular structure is disordered and porous, and the porosity of the trabecular structure is 80; The surface of the tibial plateau is provided with a disassembly platform, and the surface of the tibial plateau is provided with a snap-fit ​​groove adapted to the tibial liner, and the surface of the tibial liner is fixed with a press-fit edge adapted to the snap-fit ​​groove, and the tibial liner is used to support the movement of the femoral prosthesis; The other side surface of the tibial plateau is respectively provided with a fixing wing and a fixing column.

[0007] By adopting the above technical solution, the joint prosthesis can be freely changed in size during the actual operation, which is convenient for adjusting the surgical prosthesis selection during the operation, and finally used as a biological fixation to ensure the long-term stability of the prosthesis after implantation.

[0008] Preferably, the distance from the central axis of the first column to the rear inner wall of the half-shell prosthesis is the same as the distance from the central axis of the first column to the central axis of the second column.

[0009] By adopting the above technical solution, interchange between different specifications can be achieved.

[0010] Preferably, the surface of the tibial pad is provided with two symmetrical disassembly grooves, and the surface of the disassembly platform is provided with a tibial plateau groove.

[0011] By adopting the above technical solution, the tibial pad can be quickly disassembled.

[0012] Preferably, the fixing wings and the fixing posts are detachably arranged on the surface of the tibial plateau, and the surfaces of the fixing posts and the tibial plateau are provided with fixing components for fixing the fixing wings and the fixing posts.

[0013] By adopting the above technical solution, it is convenient to quickly install and fix the fixed columns and fixed wings.

[0014] Preferably, the fixing assembly includes a first inserting slot and a second inserting slot respectively opened on the surface of the tibial plateau and respectively adapted to the fixing column and the fixing wing.

[0015] By adopting the above technical solution, the fixing column and the fixing wing can be quickly plugged into the tibial platform.

[0016] Preferably, a rectangular cavity is opened inside the fixed column, and a rectangular plate and a sealing piston plate are slidingly provided on the inner wall of the rectangular cavity. Two symmetrical push rods are fixed on the surface of the rectangular plate, and the ends of the two push rods away from the rectangular plate are fixedly connected to the surface of the sealing piston plate.

[0017] By adopting the above technical solution, the sealing piston plate can be driven to move automatically by the movement of the rectangular plate and under the action of the two ejector rods.

[0018] Preferably, a threaded column is rotatably provided on the inner wall of the rectangular cavity, and a threaded hole is provided on the surface of the rectangular plate that is threadedly connected to the outer surface of the threaded column, a limiting block is provided on the end of the threaded column, a rotation groove is provided on the end of the fixed column, a rotation block is rotatably provided on the inner wall of the rotation groove, and a hexagonal operating groove is provided on the surface of the rotation block, a rotation hole extending to the inside of the rectangular cavity is provided on the inner wall of the rotation groove, the outer surface of the threaded column is rotatably connected to the inner wall of the rotation hole, and the other end of the threaded column is fixedly connected to the surface of the rotation block.

[0019] By adopting the above technical solution, the rotating block is rotated by an external hexagonal wrench, and the rotation of the rotating block drives the threaded column to rotate, so that the rectangular plate can be automatically driven by the rotation of the threaded column and under the action of the threaded hole, so that the sealing piston plate can be automatically moved by the rotation of the rotating block. Moreover, the function of the limit block is to effectively limit the moving position of the rectangular plate to prevent the rectangular plate from detaching from the threaded column.

[0020] Preferably, a sealing cavity is provided on the outer surface of the fixed column, and a first positioning block is slidingly provided on the inner wall of the sealing cavity, the outer surface of the first positioning block is sleeved with a rubber sleeve slidingly connected to the inner wall of the sealing cavity, the inner wall of the rectangular cavity is provided with an air passage extending to the inside of the sealing cavity, and the inner wall of the first plug-in slot is provided with a first positioning groove adapted to the first positioning block, wherein the rubber sleeve is provided so that the first positioning block can always maintain a sealing relationship between the first positioning block and the inner wall of the sealing cavity during the movement, thereby effectively preventing air leakage inside the sealing cavity.

[0021] By adopting the above technical solution, during the movement of the sealing piston plate, the air inside the rectangular cavity can be transported to the sealing cavity through the air passage, thereby driving the first positioning block to automatically move inside the sealing cavity.

[0022] Preferably, a sliding cavity is provided on the inner wall of the second plug-in slot, and a second positioning block is slidably provided on the inner wall of the sliding cavity, and a second positioning groove adapted to the second positioning block is provided on the surface of the fixed wing.

[0023] By adopting the above technical solution, the second positioning block can be inserted into the interior of the second positioning groove to achieve effective fixation between the fixing wing and the inner wall of the second plug-in groove.

[0024] Preferably, the inner wall of the first positioning groove is provided with a through hole extending to the inner wall of the sliding cavity, and a sliding rod is slidingly provided on the inner wall of the through hole, one end of the sliding rod is fixedly connected to the surface of the first positioning block, and the other end of the sliding rod is fixedly connected to the surface of the second positioning block, and a return spring is sleeved on the surface of the sliding rod, and the two ends of the return spring are respectively fixedly connected to the inner wall of the first positioning groove and the surface of the first positioning block.

[0025] By adopting the above technical solution, during the movement of the first positioning block, the sliding rod can be driven to move, so that the sliding rod pushes the second positioning block, causing the second positioning block to move on the inner wall of the sliding cavity and be inserted into the second positioning groove on the fixed wing, thereby realizing rapid fixation of the fixed wing 203 and the inner wall of the second plug-in slot.

[0026] Furthermore, by adopting the above-mentioned technical solution, the fixed column and the fixed wing in the prosthesis can achieve effective fixation of the fixed column and the inner wall of the first plug-in slot during installation. At the same time, during the movement of the first positioning block, the sliding rod can be driven to move, so that the sliding rod pushes the second positioning block, so that the second positioning block moves on the inner wall of the sliding cavity and is inserted into the second positioning slot on the fixed wing, thereby realizing rapid movement of the fixed wing and the inner wall of the second plug-in slot, thereby achieving the purpose of rapid fixed installation of the fixed column and the fixed wing.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The interchangeable joint prosthesis described in this application, by providing a femoral prosthesis, a tibial plateau and a tibial pad, enables the joint prosthesis to be freely changed in size during the actual operation, facilitating intraoperative adjustment of the surgical prosthesis selection, and finally used as a biological fixation to ensure the long-term stability of the prosthesis after implantation.

[0028] 2. The interchangeable joint prosthesis described in the present application is provided with a fixing assembly so that the fixed column and the fixed wing in the prosthesis can be respectively inserted into the first insertion groove and the second insertion groove of the tibial platform during installation, and the rotating block is rotated by an external hexagonal wrench. The rotation of the rotating block drives the threaded column to rotate, and the rotation of the threaded column drives the rectangular plate to move. The movement of the rectangular plate drives the sealing piston plate to move through the push rod, and the air inside the rectangular cavity is pressed into the sealed cavity through the airway, so that the first positioning block in the sealed cavity automatically moves and is inserted into the first positioning groove on the inner wall of the first insertion groove, thereby achieving effective fixation of the fixed column and the inner wall of the first insertion groove. At the same time, during the movement of the first positioning block, the sliding rod can be driven to move, so that the sliding rod pushes the second positioning block, so that the second positioning block moves on the inner wall of the sliding cavity and is inserted into the second positioning groove on the fixed wing, thereby achieving rapid movement of the fixed wing and the inner wall of the second insertion groove, thereby achieving the purpose of rapid fixed installation of the fixed column and the fixed wing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the cross-sectional structure of the femoral prosthesis in Example 1 of the present application; Figure 2 This is a schematic diagram of the overall structure of the tibial plateau of the present application; Figure 3 This is a schematic diagram of the tibial plateau structure from a bottom-up perspective of the present application; Figure 4 It is a schematic diagram of the three-dimensional structure, bottom view and front view of the tibial pad of the present application; Figure 5 This is a schematic diagram of the top view of the tibial plateau structure of the present application; Figure 6This is a schematic diagram of the top view of the tibial plateau structure in Example 2 of the present application; Figure 7 Schematic diagram of the cross-sectional structure of the tibial plateau in Example 2 of the present application; Figure 8 This application Figure 7 A in the middle is an enlarged structural diagram; Figure 9 This application Figure 7 Enlarged structural diagram at point B in the middle.

[0030] Description of reference numerals: 100. Femoral prosthesis; 101. Half-shell prosthesis; 102. First pillar; 103. Second pillar; 104. Trabecular structure; 200, tibial plateau; 201, disassembly platform; 202, snap-in slot; 203, fixed wing; 204, fixed column; 300, tibial pad; 301, press-fit edge; 302, removal slot; 400, fixing assembly; 401, first plug-in slot; 402, second plug-in slot; 403, rectangular cavity; 404, rectangular plate; 405, sealing piston plate; 406, ejector rod; 407, threaded column; 408, rotating groove; 409, rotating block; 4010, sealing cavity; 4011, first positioning block; 4012, airway; 4013, first positioning groove; 4014, sliding cavity; 4015, second positioning block; 4016, second positioning groove; 4017, sliding rod; 4018, return spring. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The following combination Figures 1 to 9 , further details of this application are given.

[0033] Example 1 Please pay attention to Figures 1 to 5An interchangeable joint prosthesis includes a femoral prosthesis 100, a tibial plateau 200, and a tibial liner 300; the femoral prosthesis 100 includes a half-shell prosthesis 101, a first column 102, a second column 103, and a trabecular structure 104. The first column 102 and the second column 103 are both fixed to the inner wall of the half-shell prosthesis 101. The number of the trabecular structures 104 is three, and the trabecular structures 104 are disordered and porous. The porosity is 80; a disassembly platform 201 is provided on the surface of the tibial plateau 200, and a snap-in groove 202 adapted to the tibial liner 300 is opened on the surface of the tibial plateau 200, and a press-fit edge 301 adapted to the snap-in groove 202 is fixed on the surface of the tibial liner 300, and the tibial liner 300 is used to support the movement of the femoral prosthesis 100; a fixing wing 203 and a fixing column 204 are respectively provided on the other side surface of the tibial plateau 200.

[0034] Specifically, the present invention provides a femoral prosthesis 100, a tibial plateau 200 and a tibial pad 300, so that the size of the joint prosthesis can be freely changed during the actual operation, which is convenient for adjusting the surgical prosthesis selection during the operation, and finally used as a biological fixation to ensure the long-term stability of the prosthesis after implantation.

[0035] Please refer to Figure 1 The distance from the central axis of the first column 102 to the rear inner wall of the half-shell prosthesis 101 is the same as the distance from the central axis of the first column 102 to the central axis of the second column 103.

[0036] Specifically, interchange between various specifications can be achieved.

[0037] Please refer to Figure 2 , Figure 4 The surface of the tibial pad 300 is provided with two symmetrical disassembly grooves 302 , and the surface of the disassembly platform 201 is provided with a tibial plateau groove.

[0038] Specifically, the tibial pad 300 can be quickly disassembled.

[0039] Example 2 Based on the first embodiment, Figures 6 to 9 , and the difference from the first embodiment is that: Please refer to Figure 6 , Figure 7 The fixing wing 203 and the fixing column 204 are detachably arranged on the surface of the tibial plateau 200 , and the fixing column 204 and the surface of the tibial plateau 200 are provided with a fixing assembly 400 for fixing the fixing wing 203 and the fixing column 204 .

[0040] Specifically, it is convenient to quickly install and fix the fixing column 204 and the fixing wing 203.

[0041] Please refer to Figure 8 , Figure 9 The fixing assembly 400 includes a first inserting slot 401 and a second inserting slot 402 which are respectively opened on the surface of the tibial plateau 200 and respectively matched with the fixing column 204 and the fixing wing 203.

[0042] Specifically, the fixing column 204 and the fixing wing 203 can be quickly plugged into the tibial plateau 200 .

[0043] Please refer to Figure 8 , Figure 9 A rectangular cavity 403 is provided inside the fixed column 204, and a rectangular plate 404 and a sealing piston plate 405 are slidingly provided on the inner wall of the rectangular cavity 403. Two symmetrical push rods 406 are fixed on the surface of the rectangular plate 404, and the ends of the two push rods 406 away from the rectangular plate 404 are fixedly connected to the surface of the sealing piston plate 405.

[0044] Specifically, the sealing piston plate 405 can be driven to move automatically by the movement of the rectangular plate 404 and under the action of the two push rods 406 .

[0045] Please refer to Figure 8 , Figure 9 A threaded column 407 is rotatably provided on the inner wall of the rectangular cavity 403, and a threaded hole is provided on the surface of the rectangular plate 404 that is threadedly connected to the outer surface of the threaded column 407. A limiting block is provided at the end of the threaded column 407, and a rotation groove 408 is provided at the end of the fixed column 204. A rotation block 409 is rotatably provided on the inner wall of the rotation groove 408, and a hexagonal operating groove is provided on the surface of the rotation block 409. A rotation hole extending to the inside of the rectangular cavity 403 is provided on the inner wall of the rotation groove 408. The outer surface of the threaded column 407 is rotatably connected to the inner wall of the rotation hole, and the other end of the threaded column 407 is fixedly connected to the surface of the rotation block 409.

[0046] Specifically, the rotating block 409 is rotated by an external hexagonal wrench, and the rotation of the rotating block 409 drives the threaded column 407 to rotate, so that the rectangular plate 404 can be automatically moved by the rotation of the threaded column 407 and under the action of the threaded hole, so that the sealing piston plate 405 can be automatically moved by the rotation of the rotating block 409. Moreover, the function of the limit block is to effectively limit the moving position of the rectangular plate 404 to prevent the rectangular plate 404 from detaching from the threaded column 407.

[0047] Please refer to Figure 8 , Figure 9A sealed cavity 4010 is provided on the outer surface of the fixed column 204, and a first positioning block 4011 is slidingly provided on the inner wall of the sealed cavity 4010. The outer surface of the first positioning block 4011 is sleeved with a rubber sleeve that is slidably connected to the inner wall of the sealed cavity 4010. The inner wall of the rectangular cavity 403 is provided with an air passage 4012 extending to the inside of the sealed cavity 4010. The inner wall of the first plug-in slot 401 is provided with a first positioning groove 4013 that is adapted to the first positioning block 4011. The rubber sleeve is provided so that the first positioning block 4011 can always maintain a sealing relationship between the first positioning block 4011 and the inner wall of the sealed cavity 4010 during the movement, thereby effectively preventing air leakage inside the sealed cavity 4010.

[0048] Specifically, during the movement of the sealing piston plate 405, the air inside the rectangular cavity 403 is delivered to the sealed cavity 4010 through the air passage 4012, thereby driving the first positioning block 4011 to automatically move inside the sealed cavity 4010. Please refer to Figure 8 , Figure 9 A sliding cavity 4014 is provided on the inner wall of the second plug-in slot 402 , and a second positioning block 4015 is slidably provided on the inner wall of the sliding cavity 4014 , and a second positioning groove 4016 adapted to the second positioning block 4015 is provided on the surface of the fixed wing 203 .

[0049] Specifically, the second positioning block 4015 can be inserted into the second positioning groove 4016 to achieve effective fixation between the fixing wing 203 and the inner wall of the second inserting groove 402 .

[0050] Please refer to Figure 8 , Figure 9 The inner wall of the first positioning groove 4013 is provided with a through hole extending to the inner wall of the sliding cavity 4014, and a sliding rod 4017 is slidingly provided on the inner wall of the through hole. One end of the sliding rod 4017 is fixedly connected to the surface of the first positioning block 4011, and the other end of the sliding rod 4017 is fixedly connected to the surface of the second positioning block 4015. A return spring 4018 is sleeved on the surface of the sliding rod 4017, and the two ends of the return spring 4018 are respectively fixedly connected to the inner wall of the first positioning groove 4013 and the surface of the first positioning block 4011.

[0051] Specifically, during the movement of the first positioning block 4011, the sliding rod 4017 can be driven to move, so that the sliding rod 4017 pushes the second positioning block 4015, causing the second positioning block 4015 to move along the inner wall of the sliding cavity 4014 and be inserted into the second positioning groove 4016 on the fixed wing 203, thereby realizing rapid fixation of the fixed wing 203 and the inner wall of the second plug-in groove 402. Furthermore, by adopting the above technical solution, the fixed column 204 and the fixed wing 203 in the prosthesis can be effectively fixed to the inner wall of the first plug-in slot 401 during installation. At the same time, during the movement of the first positioning block 4011, the sliding rod 4017 can be driven to move, so that the sliding rod 4017 pushes the second positioning block 4015, so that the second positioning block 4015 moves on the inner wall of the sliding cavity 4014 and is inserted into the second positioning slot 4016 on the fixed wing 203, thereby realizing the rapid fixation of the fixed wing 203 and the inner wall of the second plug-in slot 402, thereby achieving the purpose of rapid fixed installation of the fixed column 204 and the fixed wing 203.

[0052] The present invention provides a fixing assembly 400 so that the fixing column 204 and the fixing wing 203 in the prosthesis can be respectively inserted into the first insertion groove 401 and the second insertion groove 402 on the tibial plate 200 during installation, and the rotating block 409 is rotated by an external hexagonal wrench. The rotation of the rotating block 409 drives the threaded column 407 to rotate, and the rotation of the threaded column 407 drives the rectangular plate 404 to move. The movement of the rectangular plate 404 drives the sealing piston plate 405 to move through the push rod 406, and the air inside the rectangular cavity 403 is pressed into the sealed cavity 4010 through the airway 4012, so that the first The positioning block 4011 automatically moves and is inserted into the first positioning groove 4013 on the inner wall of the first plug-in slot 401, thereby effectively fixing the fixed column 204 and the inner wall of the first plug-in slot 401. At the same time, during the movement of the first positioning block 4011, it can drive the sliding rod 4017 to move, so that the sliding rod 4017 pushes the second positioning block 4015, so that the second positioning block 4015 moves on the inner wall of the sliding cavity 4014 and is inserted into the second positioning groove 4016 on the fixed wing 203, thereby realizing the rapid fixation of the fixed wing 203 and the inner wall of the second plug-in slot 402, thereby achieving the purpose of rapid fixed installation of the fixed column 204 and the fixed wing 203.

[0053] The working principle of the present invention is: The present invention provides a femoral prosthesis 100, a tibial plateau 200 and a tibial liner 300, so that the size of the joint prosthesis can be freely changed during the actual operation, which is convenient for adjusting the surgical prosthesis selection during the operation, and finally used as a biological fixation to ensure the long-term stability of the prosthesis after implantation. Moreover, when installing the fixed column 204 and the fixed wing 203 in the prosthesis, the fixed column 204 and the fixed wing 203 can be respectively inserted into the first insertion groove 401 and the second insertion groove 402 on the tibial plateau 200, and the rotating block 409 is rotated by an external hexagonal wrench. The rotation of the rotating block 409 drives the threaded column 407 to rotate, and the rotation of the threaded column 407 drives the rectangular plate 404 to move. The movement of the rectangular plate 404 drives the sealing piston plate 405 to move through the push rod 406, and the rectangular cavity 40 The internal air is pressed into the sealed cavity 4010 through the air passage 4012, thereby causing the first positioning block 4011 in the sealed cavity 4010 to automatically move and insert into the first positioning groove 4013 on the inner wall of the first inserting groove 401, thereby effectively fixing the fixed column 204 to the inner wall of the first inserting groove 401. At the same time, during the movement of the first positioning block 4011, the sliding rod 4017 can be driven to move, thereby causing the sliding rod 4017 to push the second positioning block 4015, causing the second positioning block 4015 to move along the inner wall of the sliding cavity 4014 and insert into the second positioning groove 4016 on the fixed wing 203, thereby quickly fixing the fixed wing 203 to the inner wall of the second inserting groove 402, and further achieving the purpose of quickly fixing and installing the fixed column 204 and the fixed wing 203.

[0054] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. An interchangeable joint prosthesis, characterized in that: It includes a femoral prosthesis (100), a tibial plateau (200) and a tibial liner (300); The femoral prosthesis (100) comprises a half-shell prosthesis (101), a first column (102), a second column (103) and a trabecular structure (104), wherein the first column (102) and the second column (103) are both fixedly arranged on the inner wall of the half-shell prosthesis (101), the number of the trabecular structures (104) is three, the trabecular structures (104) are disordered and porous, and the porosity of the trabecular structures (104) is 80; The surface of the tibial plateau (200) is provided with a disassembly platform (201), and the surface of the tibial plateau (200) is provided with a snap-fit ​​groove (202) adapted to the tibial pad (300), and the surface of the tibial pad (300) is fixed with a press-fit edge (301) adapted to the snap-fit ​​groove (202), and the tibial pad (300) is used to support the femoral prosthesis (100) to move; The other side surface of the tibial platform (200) is respectively provided with a fixing wing (203) and a fixing column (204).

2. The interchangeable joint prosthesis according to claim 1, characterized in that: The distance from the central axis of the first column (102) to the rear inner wall of the half-shell prosthesis (101) is the same as the distance from the central axis of the first column (102) to the central axis of the second column (103).

3. The interchangeable joint prosthesis according to claim 1, characterized in that: The surface of the tibial pad (300) is provided with two symmetrical disassembly grooves (302), and the surface of the disassembly platform (201) is provided with a tibial plateau groove.

4. The interchangeable joint prosthesis according to claim 1, characterized in that: The fixing wing (203) and the fixing column (204) are detachably arranged on the surface of the tibial platform (200), and the surface of the fixing column (204) and the tibial platform (200) are provided with a fixing assembly (400) for fixing the fixing wing (203) and the fixing column (204).

5. The interchangeable joint prosthesis according to claim 4, characterized in that: The fixing assembly (400) comprises a first inserting slot (401) and a second inserting slot (402) which are respectively opened on the surface of the tibial platform (200) and respectively matched with the fixing column (204) and the fixing wing (203).

6. The interchangeable joint prosthesis according to claim 5, characterized in that: A rectangular cavity (403) is provided inside the fixed column (204), and a rectangular plate (404) and a sealing piston plate (405) are slidably provided on the inner wall of the rectangular cavity (403), two symmetrical push rods (406) are fixedly provided on the surface of the rectangular plate (404), and the ends of the two push rods (406) away from the rectangular plate (404) are fixedly connected to the surface of the sealing piston plate (405).

7. The interchangeable joint prosthesis according to claim 6, characterized in that: The inner wall of the rectangular cavity (403) is rotatably provided with a threaded column (407), and the surface of the rectangular plate (404) is provided with a threaded hole threadedly connected to the outer surface of the threaded column (407), a limit block is provided at the end of the threaded column (407), a rotation groove (408) is provided at the end of the fixed column (204), a rotation block (409) is rotatably provided on the inner wall of the rotation groove (408), and a hexagonal operating groove is provided on the surface of the rotation block (409), and a rotation hole extending into the interior of the rectangular cavity (403) is provided on the inner wall of the rotation groove (408), the outer surface of the threaded column (407) is rotatably connected to the inner wall of the rotation hole, and the other end of the threaded column (407) is fixedly connected to the surface of the rotation block (409).

8. The interchangeable joint prosthesis according to claim 7, characterized in that: The outer surface of the fixed column (204) is provided with a sealed cavity (4010), and the inner wall of the sealed cavity (4010) is slidably provided with a first positioning block (4011), the outer surface of the first positioning block (4011) is sleeved with a rubber sleeve slidably connected to the inner wall of the sealed cavity (4010), the inner wall of the rectangular cavity (403) is provided with an air passage (4012) extending into the interior of the sealed cavity (4010), and the inner wall of the first plug-in slot (401) is provided with a first positioning slot (4013) adapted to the first positioning block (4011).

9. The interchangeable joint prosthesis according to claim 8, characterized in that: A sliding cavity (4014) is provided on the inner wall of the second plug-in slot (402), and a second positioning block (4015) is slidably provided on the inner wall of the sliding cavity (4014), and a second positioning groove (4016) adapted to the second positioning block (4015) is provided on the surface of the fixed wing (203).

10. The interchangeable joint prosthesis according to claim 9, characterized in that: The inner wall of the first positioning groove (4013) is provided with a through hole extending to the inner wall of the sliding cavity (4014), and a sliding rod (4017) is slidably provided on the inner wall of the through hole, one end of the sliding rod (4017) is fixedly connected to the surface of the first positioning block (4011), and the other end of the sliding rod (4017) is fixedly connected to the surface of the second positioning block (4015), and a return spring (4018) is sleeved on the surface of the sliding rod (4017), and the two ends of the return spring (4018) are respectively fixedly connected to the inner wall of the first positioning groove (4013) and the surface of the first positioning block (4011).

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