Ankle joint prosthesis

Abstract

The present invention provides an ankle joint prosthesis, which includes a tibial stem, a distal tibial prosthesis, and a tibial connector. The tibial stem is configured to be disposed in the medullary cavity of the human tibia; the tibial connector is disposed between the tibial stem and the distal tibial prosthesis so that the tibial stem and the distal tibial prosthesis are connected through the tibial connector. Among them, the tibial connector has a first connecting portion and a second connecting portion. The second connecting portion is used to connect with the tibial stem, and the first connecting portion is used to connect with the distal tibial prosthesis. The first central axis of the first connecting portion and the second central axis of the second connecting portion are arranged in parallel, so as to adjust the position of the second central axis relative to the central axis of the distal tibial prosthesis by rotating the tibial connector relative to the distal tibial prosthesis, and further adjust the position of the tibial stem relative to the distal tibial prosthesis, so that the tibial stem can better adapt to different medullary cavity shapes.

Description

Technical Field

[0001] The present invention relates to the medical field, and more particularly, to an ankle joint prosthesis. Background Art

[0002] Artificial joint replacement is mainly applied to patients suffering from joint pain, joint deformity, and loss of joint function caused by various traumas, autoimmune diseases, degenerative diseases, etc. Regarding the ankle joint, since the commonly used ankle joint fusion surgery will cause the patient to almost completely lose the motor function of the entire ankle joint, while ankle joint replacement can retain partial motor function of the patient's ankle joint and can completely solve the problems of pain and deformity of the patient's ankle joint.

[0003] However, the existing ankle joint prosthesis applied to ankle joint replacement mainly consists of three parts: a tibial plate, a talar tray, and a polyethylene liner. Among them, the tibial plate is used to connect with the tibia in the human body through the tibial medullary cavity, the talar tray is used to connect with the talus in the human body, and the polyethylene liner can slide freely relative to the tibial plate and the talar tray to achieve the basic functions of the ankle joint prosthesis. However, at least part of the medullary cavity of the human body usually deviates from the center line of the medullary cavity in different directions to a certain extent, that is, there are different medullary cavity shapes. The overall structure of the tibial plate of the existing ankle joint prosthesis is a fixed structure, which cannot well adapt to different medullary cavity shapes. Moreover, after implanting the existing ankle joint prosthesis into the human body with medullary cavities of various shapes, the connection between the tibial plate and the liner will be unstable. In particular, with the movement of the human ankle joint, it is easy to cause the prosthesis to loosen and fail, resulting in poor stability of the existing ankle joint prosthesis. Summary of the Invention

[0004] The main object of the present invention is to provide an ankle joint prosthesis to solve the problem that the existing ankle joint prosthesis in the prior art cannot adapt to different shapes of the tibial medullary cavity.

[0005] To achieve the above object, the present invention provides an ankle joint prosthesis, including: a tibial stem for being disposed in the tibial medullary cavity of the human body so that the tibial stem is connected to the tibia in the human body; a distal tibial prosthesis; a tibial connector disposed between the tibial stem and the distal tibial prosthesis so that the tibial stem and the distal tibial prosthesis are connected through the tibial connector; wherein the tibial connector has a first connecting portion and a second connecting portion, the second connecting portion is used for connecting with the tibial stem, and the first connecting portion is used for connecting with the distal tibial prosthesis; the first connecting portion has a first center line, the second connecting portion has a second center line, and the first center line and the second center line are arranged in parallel to adjust the position of the second center line relative to the center line of the distal tibial prosthesis by rotating the tibial connector relative to the distal tibial prosthesis.

[0006] Further, the tibial stem has a fixing hole, the second connecting portion is a columnar structure, and the second connecting portion is inserted into the fixing hole.

[0007] Further, a first locking hole is provided on the outer peripheral wall of the tibial stem, and the first locking hole communicates with the fixing hole, so that the tibial stem and the second connecting portion are relatively fixed by a locking nail inserted into the first locking hole.

[0008] Further, a first annular groove is provided on the outer peripheral wall of one end of the second connecting portion facing the tibial stem, and the locking nail passes through the first locking hole and abuts against the inner wall of the first annular groove.

[0009] Further, along the direction from the second connecting portion to the fixing hole, the cross-sectional area of the second connecting portion gradually decreases; wherein, the cross-sectional area of the second connecting portion is the area of the cross-section of the second connecting portion perpendicular to the extending direction of the second connecting portion.

[0010] Further, the first connecting portion is a receiving hole, and the tibial distal prosthesis includes an inserting portion, and the inserting portion is inserted into the receiving hole; wherein, the first center line is the center line of the receiving hole.

[0011] Further, the tibial connector has a second locking hole, and the second locking hole communicates with the receiving hole, so that the tibial connector and the inserting portion are relatively fixed by a fastener inserted into the second locking hole.

[0012] Further, a second annular groove is provided on the outer peripheral wall of one end of the inserting portion facing the tibial connector, and the fastener passes through the second locking hole and abuts against the inner wall of the second annular groove.

[0013] Further, the inserting portion is a columnar structure, and along the inserting direction of the inserting portion, the cross-sectional area of the inserting portion gradually decreases; wherein, the cross-sectional area of the inserting portion is the area of the cross-section of the inserting portion perpendicular to the extending direction of the inserting portion.

[0014] Further, the tibial connector includes a connecting body, and the first connecting portion and the second connecting portion are both provided on the connecting body.

[0015] Further, the tibial stem is a columnar structure, and the tibial stem includes a first tibial segment and a second tibial segment. The first end of the second tibial segment is used to connect with the first tibial segment, and the second end of the second tibial segment is used to connect with the tibial connector; along the direction in which the first tibial segment deviates from the second tibial segment, the cross-sectional area of the first tibial segment gradually decreases; wherein, the cross-section of the first tibial segment is the area of the cross-section of the first tibial segment perpendicular to the extending direction of the tibial stem.

[0016] Further, the ankle joint prosthesis further includes: a cushion assembly, at least part of the cushion assembly is slidably connected with the tibial distal prosthesis; a talus tray, at least part of the cushion assembly is rotatably arranged on the talus tray, so that the cushion assembly drives the tibial distal prosthesis and the tibial stem to rotate relative to the talus tray, and at least part of the talus tray is used to connect with the talus in the human body.

[0017] Further, the distal tibia prosthesis has a first curved surface structure, and the liner assembly has a second curved surface structure for fitting with the first curved surface structure. The first curved surface structure cooperates with the second curved surface structure to enable relative movement between the distal tibia prosthesis and the liner assembly under the cooperation of the first curved surface structure and the second curved surface structure.

[0018] Further, the first curved surface structure includes a first concave curved surface, a second convex curved surface, and a third concave curved surface. The second convex curved surface is disposed between the first concave curved surface and the third concave curved surface; the second curved surface structure includes a first convex curved surface adapted to the first concave curved surface, a second concave curved surface adapted to the second convex curved surface, and a third convex curved surface adapted to the third concave curved surface; the first concave curved surface is in slidable contact with the first convex curved surface, the second convex curved surface is in slidable contact with the second concave curved surface, and the third concave curved surface is in slidable contact with the third convex curved surface, so that the liner assembly slides relative to the distal tibia prosthesis along the extension direction of the second concave curved surface.

[0019] Further, the liner assembly includes a rotating shaft, and the talar tray has a rotating hole, and the rotating shaft is rotatably disposed in the rotating hole.

[0020] Further, the liner assembly further includes a liner body, the rotating shaft is disposed on the liner body, and the second curved surface structure is disposed on the liner body.

[0021] Further, the talar tray includes: a tray, the tray has a first rotating hole section; a seat, the tray is disposed on the seat, and the seat has a second rotating hole section, and the second rotating hole section communicates with the first rotating hole section to form a rotating hole.

[0022] Further, a reinforcing rib is disposed between the seat and the tray. The reinforcing rib has a first side wall and a second side wall. The first side wall is in at least partial fitting contact with the bottom wall of the tray, and the second side wall is in at least partial fitting contact with the outer peripheral wall of the seat.

[0023] Further, there are a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged at intervals around the outer peripheral wall of the seat.

[0024] Further, the seat is a columnar structure, and along the direction in which the seat faces away from the tray, the cross-sectional area of the seat gradually increases; wherein, the cross-sectional area of the seat is the area of the cross-section perpendicular to the extension direction of the seat.

[0025] Further, both the tibial stem and the tibial connector are made of titanium alloy material, and the distal tibia prosthesis is made of cobalt-chromium-molybdenum alloy material; wherein, at least part of the outer peripheral wall of the tibial stem is coated with a hydroxyapatite coating.

[0026] Further, the liner assembly is a polyethylene liner, and the talar tray is made of cobalt-chromium-molybdenum alloy material.

[0027] Applying the technical solution of the present invention, the ankle joint prosthesis includes a tibial stem, a distal tibial prosthesis, and a tibial connector. The tibial stem is used to be disposed in the tibial medullary cavity of the human body so that the tibial stem is connected to the tibia in the human body; the tibial connector is disposed between the tibial stem and the distal tibial prosthesis so that the tibial stem and the distal tibial prosthesis are connected through the tibial connector. Among them, the tibial connector has a first connecting portion and a second connecting portion. The second connecting portion is used to connect to the tibial stem, and the first connecting portion is used to connect to the distal tibial prosthesis. The first connecting portion has a first center line, and the second connecting portion has a second center line. Since the first center line of the first connecting portion and the second center line of the second connecting portion are arranged in parallel, when encountering different shapes of the medullary cavity, that is, when at least a part of the medullary cavity of the patient deviates from the center line of the medullary cavity in different directions to a certain extent, the position of the second center line relative to the center line of the distal tibial prosthesis can be adjusted by using the present ankle joint prosthesis and rotating the tibial connector, that is, by moving the tibial connector relative to the distal tibial prosthesis, and then the position of the tibial stem relative to the distal tibial prosthesis can be adjusted. Thus, with the position of the distal tibial prosthesis unchanged, the tibial stem connected to the second connecting portion of the tibial connector can better adapt to the above different shapes of the medullary cavity, thereby solving the problem that the ankle joint prosthesis in the prior art cannot adapt to different shapes of the tibial medullary cavity. Moreover, the ankle joint prosthesis with this structure can maintain good stability after being implanted into the human body, greatly reducing the risk of loosening and failure of the ankle joint prosthesis in the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 shows an external structural schematic diagram of an ankle joint prosthesis according to an embodiment of the ankle joint prosthesis of the present invention;

[0030] Figure 2 shows Figure 1 the internal sectional structure diagram of the ankle joint prosthesis in

[0031] Figure 3 shows Figure 1 the exploded structure diagram of the tibial stem, the tibial connector, and the distal tibial prosthesis of the ankle joint prosthesis in

[0032] Figure 4 shows Figure 1 the structural schematic diagram of the tibial connector of the ankle joint prosthesis in

[0033] Figure 5 shows Figure 1 the exploded structure diagram of the cushion assembly and the talus holder of the ankle joint prosthesis in

[0034] Among them, the above-mentioned drawings include the following reference numerals:

[0035] 10. Ankle joint prosthesis; 20. Tibial stem; 21. First tibial segment; 23. Second tibial segment; 231. Fixing hole; 232. First locking hole; 30. Distal tibial prosthesis; 31. Distal tibial body; 311. First concave surface; 312. Second convex surface; 313. Third concave surface; 32. Insertion part; 321. Second annular groove; 40. Tibial connector; 41. First connecting part; 42. Second connecting part; 421. First annular groove; 43. Connecting body; 50. Pad assembly; 51. Pad body; 511. First convex surface; 512. Second concave surface; 513. Third convex surface; 52. Rotating shaft; 60. Talus support; 61. Support plate; 62. Support base; 63. Reinforcing rib. Detailed implementation manners

[0036] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0037] The present invention provides an ankle joint prosthesis 10. Please refer to Figures 1 to 5 , this ankle joint prosthesis 10 includes a tibial stem 20, a distal tibial prosthesis 30 and a tibial connector 40. The tibial stem 20 is used to be disposed in the medullary cavity of the human tibia so that the tibial stem 20 is connected to the tibia in the human body; the tibial connector 40 is disposed between the tibial stem 20 and the distal tibial prosthesis 30 so that the tibial stem 20 and the distal tibial prosthesis 30 are connected through the tibial connector 40; among them, the tibial connector 40 has a first connecting part 41 and a second connecting part 42. The second connecting part 42 is used to connect to the tibial stem 20, and the first connecting part 41 is used to connect to the distal tibial prosthesis 30; the first connecting part 41 has a first center line, the second connecting part 42 has a second center line, and the first center line and the second center line are arranged in parallel to adjust the position of the second center line relative to the center line of the distal tibial prosthesis 30 by rotating the tibial connector 40 relative to the distal tibial prosthesis 30.

[0038] In the ankle joint prosthesis 10 of the present invention, the ankle joint prosthesis 10 includes a tibial stem 20, a distal tibial prosthesis 30, and a tibial connector 40. The tibial connector 40 has a first connecting portion 41 and a second connecting portion 42. Since the first central axis of the first connecting portion 41 and the second central axis of the second connecting portion 42 are arranged in parallel, when encountering different shapes of the medullary cavity, that is, when at least a part of the medullary cavity of the patient deviates from the central axis of the medullary cavity in different directions to a certain extent, the position of the second central axis relative to the central axis of the distal tibial prosthesis 30 can be adjusted by using the present ankle joint prosthesis 10 and rotating the tibial connector 40, that is, by rotating the tibial connector 40 relative to the distal tibial prosthesis 30. Furthermore, the position of the tibial stem 20 relative to the distal tibial prosthesis 30 can be adjusted. Thus, with the position of the distal tibial prosthesis 30 unchanged, the tibial stem 20 connected to the second connecting portion 42 of the tibial connector 40 can better adapt to the above-mentioned different shapes of the medullary cavity, thereby solving the problem that the ankle joint prosthesis in the prior art cannot adapt to different shapes of the tibial medullary cavity; moreover, the ankle joint prosthesis 10 with such a structure can maintain good stability after being implanted into the human body, greatly reducing the risk of loosening and failure of the ankle joint prosthesis 10 in the human body.

[0039] During the specific implementation process, the length and size of the tibial stem 20 can be selected according to actual needs to better match the cavity size of the tibial medullary cavity; in addition, the ankle joint prosthesis 10 can also be selected so that the distance between the first central axis and the second central axis is adapted to the degree of deviation of at least a part of the medullary cavity of the patient from the central axis of the medullary cavity, thereby enabling the ankle joint prosthesis 10 to better match the medullary cavity of the patient.

[0040] To achieve the connection between the second connecting portion 42 and the tibial stem 20, as Figure 3 shown, the tibial stem 20 has a fixing hole 231. The second connecting portion 42 is a columnar structure, and the second connecting portion 42 is inserted into the fixing hole 231 so that the tibial stem 20 and the tibial connector 40 are relatively fixed. Optionally, the fixing hole 231 is a columnar hole.

[0041] Specifically, a first locking hole 232 is provided on the outer peripheral wall of the tibial stem 20. The first locking hole 232 communicates with the fixing hole 231 to relatively fix the tibial stem 20 and the second connecting portion 42 by a locking nail inserted into the first locking hole 232, that is, the tibial connector 40 and the tibial stem 20 are relatively fixed; through the mutual cooperation between the locking nail and the tibial stem 20 and the second connecting portion 42 respectively, the overall structure after the tibial connector 40 and the tibial stem 20 are assembled is stable, which can prevent the tibial connector 40 from continuing to rotate after the position of the tibial stem 20 relative to the distal tibial prosthesis 30 is adjusted, thereby destroying the good adaptability between the tibial stem 20 and the tibial medullary cavity.

[0042] During the specific implementation process, a first annular groove 421 is provided on the outer peripheral wall of one end of the second connecting portion 42 facing the tibial stem 20, and the locking nail passes through the first locking hole 232 and abuts against the inner wall of the first annular groove 421. This connection method makes the assembly and disassembly between the tibial connector 40 and the tibial stem 20 relatively convenient, and helps to strengthen the stability of the overall structure after the tibial connector 40 and the tibial stem 20 are assembled. Alternatively, a locking hole corresponding to the position of the first locking hole 232 is provided on the second connecting portion 42, and the locking nail sequentially penetrates into the first locking hole 232 and the locking hole to relatively fix the second connecting portion 42 and the tibial stem 20.

[0043] Specifically, along the direction from the second connecting portion 42 to the fixing hole 231, the cross-sectional area of the second connecting portion 42 gradually decreases. Here, the cross-sectional area of the second connecting portion 42 is the area of the cross-section perpendicular to its extending direction. This makes the connection between the second connecting portion 42 and the tibial stem 20 more stable and also makes the operation of inserting the second connecting portion 42 into the fixing hole 231 more convenient.

[0044] To achieve the connection between the distal tibial prosthesis 30 and the first connecting portion 41, as Figure 3 shown, the first connecting portion 41 is a receiving hole, and the distal tibial prosthesis 30 includes an inserting portion 32. The inserting portion 32 is inserted into the receiving hole to relatively fix the distal tibial prosthesis 30 and the tibial connector 40; wherein, the first center line is the center line of the receiving hole.

[0045] Specifically, the tibial connector 40 has a second locking hole, and the second locking hole communicates with the receiving hole to relatively fix the tibial connector 40 and the inserting portion 32 through a fastener penetrating through the second locking hole, that is, the distal tibial prosthesis 30 and the tibial connector 40 are relatively fixed; through the mutual cooperation between the fastener and the distal tibial prosthesis 30 and the tibial connector 40 respectively, the overall structure after the distal tibial prosthesis 30 and the tibial connector 40 are assembled is made stable, so as to prevent the distal tibial prosthesis 30 from rotating after the position of the tibial stem 20 relative to the distal tibial prosthesis 30 is adjusted, thereby destroying the good adaptability between the tibial stem 20 and the tibial medullary cavity.

[0046] During the specific implementation process, a second annular groove 321 is provided on the outer peripheral wall of one end of the inserting portion 32 facing the tibial connector 40, and the fastener passes through the second locking hole and abuts against the inner wall of the second annular groove 321. This connection method makes the assembly and disassembly between the tibial connector 40 and the distal tibial prosthesis 30 relatively convenient, and helps to strengthen the stability of the overall structure after the tibial connector 40 and the distal tibial prosthesis 30 are assembled. Alternatively, a limiting hole corresponding to the position of the second locking hole is provided on the inserting portion 32, and the fastener sequentially penetrates into the second locking hole and the limiting hole to relatively fix the inserting portion 32 and the tibial connector 40.

[0047] Specifically, the insertion part 32 is a columnar structure. Correspondingly, the receiving hole is a columnar hole. Along the insertion direction of the insertion part 32, that is, the direction from the insertion part 32 to the first connecting part 41, the cross-sectional area of the insertion part 32 gradually decreases. Herein, the cross-sectional area of the insertion part 32 is the area of the cross-section of the insertion part 32 perpendicular to its extending direction. This makes the connection between the insertion part 32 and the tibial connector 40 more stable and also makes the operation of inserting the insertion part 32 into the receiving hole more convenient.

[0048] Specifically, the tibial connector 40 includes a connecting body 43, and both the first connecting part 41 and the second connecting part 42 are arranged on the connecting body 43. In the specific implementation process, the second connecting part 42 is arranged on the upper part of the connecting body 43, and the receiving hole is arranged on the bottom wall of the connecting body 43.

[0049] Specifically, the tibial stem 20 is a columnar structure. The tibial stem 20 includes a first tibial segment 21 and a second tibial segment 23. The first end of the second tibial segment 23 is used to connect with the first tibial segment 21, and the second end of the second tibial segment 23 is used to connect with the tibial connector 40. Along the direction in which the first tibial segment 21 deviates from the second tibial segment 23, the cross-sectional area of the first tibial segment 21 gradually decreases. Herein, the cross-section of the first tibial segment 21 is the area of the cross-section of the first tibial segment 21 perpendicular to the extending direction of the tibial stem 20. This can make the operation of inserting the tibial stem 20 into the tibial medullary cavity more convenient. Optionally, the end face of the first tibial segment 21 far from the second tibial segment 23 is a hemispherical structure. The fixing hole 231 is arranged at the bottom of the second tibial segment 23. The first locking hole 232 is arranged at a position near the bottom end of the second tibial segment 23.

[0050] Specifically, the ankle joint prosthesis 10 further includes a cushion assembly 50 and a talar tray 60. At least a part of the cushion assembly 50 is slidably connected to the distal tibia prosthesis 30, and at least a part of the cushion assembly 50 is rotatably disposed on the talar tray 60, so that the cushion assembly 50 drives the distal tibia prosthesis 30 and the tibial stem 20 to rotate relative to the talar tray 60. At least a part of the talar tray 60 is used to connect with the talus in the human body. By assembling the tibial stem 20, the tibial connector 40, the distal tibia prosthesis 30, the cushion assembly 50 and the talar tray 60 to form the ankle joint prosthesis 10, the implantation and disassembly of the ankle joint prosthesis 10 formed in this way are relatively flexible and convenient; the sliding connection between the cushion assembly 50 and the distal tibia prosthesis 30 and the rotational connection between the cushion assembly 50 and the talar tray 60 enable the cushion assembly 50 to slide relative to the distal tibia prosthesis 30 and rotate relative to the talar tray 60 respectively. At the same time, the cushion assembly 50 can also drive the tibial prosthesis assembly to rotate relative to the talar tray 60, which enables the ankle joint of the patient to achieve relatively diverse movement forms after the ankle joint prosthesis 10 is implanted into the human body, thus solving the problem that the movement form of the ankle joint prosthesis in the prior art is relatively single.

[0051] It should be noted that the tibia in the human body mentioned above is the remaining tibia in the human body after resection; the talus in the human body mentioned above is the remaining talus in the human body after resection.

[0052] In order to achieve the sliding connection between the cushion assembly 50 and the distal tibia prosthesis 30, the distal tibia prosthesis 30 has a first curved surface structure, and the cushion assembly 50 has a second curved surface structure for fitting with the first curved surface structure. The first curved surface structure and the second curved surface structure cooperate with each other so that the distal tibia prosthesis 30 and the cushion assembly 50 move relative to each other under the cooperation of the first curved surface structure and the second curved surface structure.

[0053] Specifically, the first curved surface structure includes a first concave curved surface 311, a second convex curved surface 312, and a third concave curved surface 313. The second convex curved surface 312 is disposed between the first concave curved surface 311 and the third concave curved surface 313. The second curved surface structure includes a first convex curved surface 511 adapted to the first concave curved surface 311, a second concave curved surface 512 adapted to the second convex curved surface 312, and a third convex curved surface 513 adapted to the third concave curved surface 313. The first concave curved surface 311 is in slidable contact with the first convex curved surface 511, the second convex curved surface 312 is in slidable contact with the second concave curved surface 512, and the third concave curved surface 313 is in slidable contact with the third convex curved surface 513, so that the cushion assembly 50 slides relative to the distal tibia prosthesis 30 along the extension direction of the second concave curved surface 512. At the same time, the first concave curved surface 311, the second concave curved surface 512, and the third concave curved surface 313 also respectively impose a certain degree of restriction on the first convex curved surface 511, the second convex curved surface 312, and the third convex curved surface 513, that is, the first convex curved surface 511 can only slide within the curved surface range of the first concave curved surface 311, the second convex curved surface 312 can only slide within the curved surface range of the second concave curved surface 512, and the third convex curved surface 513 can only slide within the curved surface range of the third concave curved surface 313. This not only ensures that the cushion assembly 50 can slide relative to the distal tibia prosthesis 30 within a certain range, but also prevents the cushion assembly 50 from completely detaching from the distal tibia prosthesis 30, thereby ensuring the stability of the overall structure of the ankle joint prosthesis 10.

[0054] Optionally, at least a part of the first concave curved surface 311 and at least a part of the third concave curved surface 313 are on the same arc surface. Correspondingly, at least a part of the first convex curved surface 511 and at least a part of the third convex curved surface 513 are on the same arc surface.

[0055] During the specific implementation process, the distal tibia prosthesis 30 further includes a distal tibia body 31, and the insertion portion 32 and the first curved surface structure are both disposed on the distal tibia body 31. Optionally, the insertion portion 32 is disposed on the upper part of the distal tibia body 31, and the first concave curved surface 311, the second convex curved surface 312, and the third concave curved surface 313 are all disposed on the bottom wall of the distal tibia body 31.

[0056] In order to achieve the rotational connection between the cushion assembly 50 and the talus tray 60, the cushion assembly 50 includes a rotating shaft 52. The talus tray 60 has a rotating hole, and the rotating shaft 52 is rotatably inserted into the rotating hole, so that the cushion assembly 50 can rotate relative to the talus tray 60, and further the cushion assembly 50 drives the tibia prosthesis assembly to rotate relative to the talus tray 60.

[0057] Specifically, the gasket assembly 50 further includes a gasket body 51; a rotating shaft 52 is disposed on the gasket body 51, and a second curved surface structure is disposed on the gasket body 51. In the specific implementation process, the first convex curved surface 511, the second concave curved surface 512, and the third convex curved surface 513 are all disposed on the top wall of the gasket body 51, and the rotating shaft 52 is disposed at the lower part of the gasket body 51.

[0058] Specifically, the talus support 60 includes a support plate 61 and a support base 62; the support plate 61 has a first rotation hole section; the support plate 61 is disposed on the support base 62, and the support base 62 has a second rotation hole section, and the second rotation hole section communicates with the first rotation hole section to form a rotation hole. In the specific implementation process, the support plate 61 is disposed on the upper part of the support base 62.

[0059] In order to more stably support the support plate 61 and make the overall structure of the talus support 60 more stable, a reinforcing rib 63 is disposed between the support base 62 and the support plate 61. The reinforcing rib 63 has a first side wall and a second side wall. The first side wall is in contact with at least a part of the bottom wall of the support plate 61, and the second side wall is in contact with at least a part of the outer peripheral wall of the support base 62. Optionally, the reinforcing rib 63 is a substantially triangular plate, and two adjacent side walls of the triangular plate are the first side wall and the second side wall respectively.

[0060] In the specific implementation process, there are multiple reinforcing ribs 63, and the multiple reinforcing ribs 63 are arranged at intervals around the outer peripheral wall of the support base 62 so that the multiple reinforcing ribs 63 can evenly support the support plate 61.

[0061] In the specific implementation process, the support base 62 is a columnar structure, and along the direction away from the support plate 61 of the support base 62, the cross-sectional area of the support base 62 gradually increases; wherein, the cross-sectional area of the support base 62 is the area of the cross-section perpendicular to the extension direction of the support base 62; this can further make the support of the support base 62 on the support plate 61 more stable.

[0062] In the specific implementation process, the gasket assembly 50 is a polyethylene gasket, and a ultra-high molecular weight polyethylene gasket can be preferably used; the talus support 60 and the distal tibia prosthesis 30 are both made of cobalt-chromium-molybdenum alloy; the tibial stem 20 and the tibial connector 40 are both made of titanium alloy, and at least a part of the outer peripheral wall of the tibial stem 20 is coated with a hydroxyapatite coating, and this hydroxyapatite coating has the function of inducing the growth of bone cells, and the induced bone cells help the tibial stem 20 to be more stably inserted into the tibial medullary cavity, and further make the ankle joint prosthesis 10 more stable after being implanted into the human body.

[0063] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0064] In the ankle joint prosthesis 10 of the present invention, the ankle joint prosthesis 10 includes a tibial stem 20, a distal tibial prosthesis 30, and a tibial connector 40. The tibial stem 20 is configured to be disposed in the tibial medullary cavity of the human body so that the tibial stem 20 is connected to the tibia in the human body. The tibial connector 40 is disposed between the tibial stem 20 and the distal tibial prosthesis 30 so that the tibial stem 20 and the distal tibial prosthesis 30 are connected through the tibial connector 40. Among them, the tibial connector 40 has a first connecting portion 41 and a second connecting portion 42. The second connecting portion 42 is used to connect with the tibial stem 20, and the first connecting portion 41 is used to connect with the distal tibial prosthesis 30. The first connecting portion 41 has a first central axis, and the second connecting portion 42 has a second central axis. Since the first central axis of the first connecting portion 41 and the second central axis of the second connecting portion 42 are arranged in parallel, when encountering different shapes of the medullary cavity, that is, when at least a part of the medullary cavity of the patient deviates from the central axis of the medullary cavity in different directions to a certain extent, by using the present ankle joint prosthesis 10 and rotating the tibial connector 40, that is, by rotating the tibial connector 40 relative to the distal tibial prosthesis 30, the position of the second central axis relative to the central axis of the distal tibial prosthesis 30 can be adjusted, and then the position of the tibial stem 20 relative to the distal tibial prosthesis 30 can be adjusted. Thus, with the position of the distal tibial prosthesis 30 unchanged, the tibial stem 20 connected to the second connecting portion 42 of the tibial connector 40 can better adapt to the above different shapes of the medullary cavity, thereby solving the problem that the ankle joint prosthesis in the prior art cannot adapt to different shapes of the tibial medullary cavity. Moreover, the ankle joint prosthesis 10 with this structure can maintain good stability after being implanted into the human body, greatly reducing the risk of loosening and failure of the ankle joint prosthesis 10 in the human body.

[0065] For the sake of convenience of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures afterwards. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0068] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An ankle joint prosthesis, characterized in that, Comprising: A tibial stem (20) for being disposed in the medullary cavity of the human tibia so as to connect the tibial stem (20) with the tibia in the human body; A distal tibial prosthesis (30); A tibial connector (40), the tibial connector (40) being disposed between the tibial stem (20) and the distal tibial prosthesis (30) so that the tibial stem (20) and the distal tibial prosthesis (30) are connected through the tibial connector (40); Wherein, the tibial connector (40) has a first connecting portion (41) and a second connecting portion (42), the second connecting portion (42) is for connecting with the tibial stem (20), and the first connecting portion (41) is for connecting with the distal tibial prosthesis (30); the first connecting portion (41) has a first center line, the second connecting portion (42) has a second center line, and the first center line and the second center line are arranged in parallel to adjust the position of the second center line relative to the center line of the distal tibial prosthesis (30) by rotating the tibial connector (40) relative to the distal tibial prosthesis (30); The tibial stem (20) has a fixing hole (231), the second connecting portion (42) is a columnar structure, and the second connecting portion (42) is inserted into the fixing hole (231); A first locking hole (232) is provided on the outer peripheral wall of the tibial stem (20), and the first locking hole (232) communicates with the fixing hole (231) so that the tibial stem (20) and the second connecting portion (42) are relatively fixed by a locking nail passing through the first locking hole (232); A first annular groove (421) is provided on the outer peripheral wall of one end of the second connecting portion (42) facing the tibial stem (20), and the locking nail passes through the first locking hole (232) and abuts against the inner wall of the first annular groove (421); The first connecting portion (41) is a receiving hole, the distal tibial prosthesis (30) includes an inserting portion (32), and the inserting portion (32) is inserted into the receiving hole; wherein, the first center line is the center line of the receiving hole; The tibial connector (40) has a second locking hole, and the second locking hole communicates with the receiving hole so that the tibial connector (40) and the inserting portion (32) are relatively fixed by a fastener passing through the second locking hole; A second annular groove (321) is provided on the outer peripheral wall of one end of the inserting portion (32) facing the tibial connector (40), and the fastener passes through the second locking hole and abuts against the inner wall of the second annular groove (321).

2. The ankle joint prosthesis according to claim 1, characterized in that, Along the direction from the second connecting portion (42) to the fixing hole (231), the cross-sectional area of the second connecting portion (42) gradually decreases; wherein, the cross-sectional area of the second connecting portion (42) is the area of the cross-section of the second connecting portion (42) perpendicular to the extending direction of the second connecting portion (42).

3. The ankle joint prosthesis according to claim 1, characterized in that, The inserting part (32) is of a columnar structure, and along the inserting direction of the inserting part (32), the cross-sectional area of the inserting part (32) gradually decreases; wherein, the cross-sectional area of the inserting part (32) is the area of the cross-section of the inserting part (32) perpendicular to the extending direction of the inserting part (32).

4. The ankle joint prosthesis according to claim 1, characterized in that, The tibial connector (40) includes a connecting body (43), and both the first connecting part (41) and the second connecting part (42) are arranged on the connecting body (43).

5. The ankle joint prosthesis according to claim 1, characterized in that, The tibial stem (20) is of a columnar structure. The tibial stem (20) includes a first tibial segment (21) and a second tibial segment (23). The first end of the second tibial segment (23) is used for connecting with the first tibial segment (21), and the second end of the second tibial segment (23) is used for connecting with the tibial connector (40). Along the direction in which the first tibial segment (21) faces away from the second tibial segment (23), the cross-sectional area of the first tibial segment (21) gradually decreases; wherein, the cross-section of the first tibial segment (21) is the area of the cross-section of the first tibial segment (21) perpendicular to the extending direction of the tibial stem (20).

6. The ankle joint prosthesis according to claim 1, characterized in that, The ankle joint prosthesis further includes: a cushion assembly (50), at least part of the cushion assembly (50) is slidably connected to the distal tibial prosthesis (30); a talar tray (60), at least part of the cushion assembly (50) is rotatably arranged on the talar tray (60), so that the cushion assembly (50) drives the distal tibial prosthesis (30) and the tibial stem (20) to rotate relative to the talar tray (60), and at least part of the talar tray (60) is used for connecting with the talus in the human body.

7. The ankle joint prosthesis according to claim 6, characterized in that, The distal tibial prosthesis (30) has a first curved surface structure, and the cushion assembly (50) has a second curved surface structure for fitting with the first curved surface structure. The first curved surface structure and the second curved surface structure cooperate with each other, so that the distal tibial prosthesis (30) and the cushion assembly (50) move relative to each other under the cooperation of the first curved surface structure and the second curved surface structure.

8. The ankle joint prosthesis according to claim 7, characterized in that, The first curved surface structure includes a first concave curved surface (311), a second convex curved surface (312) and a third concave curved surface (313), and the second convex curved surface (312) is arranged between the first concave curved surface (311) and the third concave curved surface (313). The second curved surface structure includes a first convex surface (511) adapted to the first concave curved surface (311), a second concave curved surface (512) adapted to the second convex surface (312), and a third convex surface (513) adapted to the third concave curved surface (313); the first concave curved surface (311) is in slidable contact with the first convex surface (511), the second convex surface (312) is in slidable contact with the second concave curved surface (512), and the third concave curved surface (313) is in slidable contact with the third convex surface (513), so that the liner assembly (50) slides relative to the distal tibia prosthesis (30) along the extension direction of the second concave curved surface (512).

9. The ankle joint prosthesis according to claim 8, characterized in that, The liner assembly (50) includes: A rotating shaft (52), the talar tray (60) has a rotating hole, and the rotating shaft (52) is rotatably inserted into the rotating hole.

10. The ankle joint prosthesis according to claim 9, characterized in that, The liner assembly (50) further includes: A liner body (51), the rotating shaft (52) is arranged on the liner body (51), and the second curved surface structure is arranged on the liner body (51).

11. The ankle joint prosthesis according to claim 9, characterized in that, The talar tray (60) includes: A tray (61), the tray (61) has a first rotating hole section; A socket (62), the tray (61) is arranged on the socket (62), the socket (62) has a second rotating hole section, and the second rotating hole section communicates with the first rotating hole section to form the rotating hole.

12. The ankle joint prosthesis according to claim 11, characterized in that, A reinforcing rib (63) is arranged between the socket (62) and the tray (61), the reinforcing rib (63) has a first side wall and a second side wall, the first side wall is in at least partial fitting contact with the bottom wall of the tray (61), and the second side wall is in at least partial fitting contact with the outer peripheral wall of the socket (62).

13. The ankle joint prosthesis according to claim 12, characterized in that, There are a plurality of the reinforcing ribs (63), and the plurality of reinforcing ribs (63) are arranged at intervals around the outer peripheral wall of the socket (62).

14. The ankle joint prosthesis according to claim 11, characterized in that, The socket (62) is a columnar structure, and along the direction in which the socket (62) faces away from the tray (61), the cross-sectional area of the socket (62) gradually increases; wherein, the cross-sectional area of the socket (62) is the area of the cross-section of the socket (62) perpendicular to the extension direction of the socket (62).

15. The ankle joint prosthesis according to claim 1, characterized in that, Both the tibial stem (20) and the tibial connector (40) are made of titanium alloy material, and the distal tibia prosthesis (30) is made of cobalt-chromium-molybdenum alloy material; wherein, at least part of the outer peripheral wall of the tibial stem (20) is coated with a hydroxyapatite coating.

16. The ankle joint prosthesis according to claim 6, characterized in that, The liner assembly (50) is a polyethylene liner, and the talar tray (60) is made of cobalt-chromium-molybdenum alloy material.

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