CN211560550U

CN211560550U - Ankle joint prosthesis

Info

Publication number: CN211560550U
Application number: CN201922120507.1U
Authority: CN
Inventors: 苏永琳
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-09-25
Anticipated expiration: 2029-11-28

Abstract

The utility model provides an ankle joint prosthesis, which comprises a tibia handle, a tibia far-end prosthesis and a tibia connector, wherein the tibia handle is arranged in a tibia marrow cavity of a human body; the tibia connector is arranged between the tibia handle and the tibia far-end prosthesis, so that the tibia handle and the tibia far-end prosthesis are connected through the tibia connector; the tibia connector is provided with a first connecting part and a second connecting part, the second connecting part is used for being connected with the tibia handle, and the first connecting part is used for being connected with the tibia far-end prosthesis; the first central line that first connecting portion have and the second central line that second connecting portion have set up in parallel to through making the shin bone connector rotate for the distal prosthesis of shin bone to adjust the position of second central line for the central line of distal prosthesis of shin bone, and then the position of adjustment shin bone stock relative distal prosthesis of shin bone, thereby make the shin bone stock can adapt to different marrow chamber shapes better.

Description

Ankle joint prosthesis

Technical Field

The utility model relates to a medical field particularly, relates to an ankle joint false body.

Background

Artificial joint replacement is mainly applied to patients suffering from joint pain, joint deformity and joint function loss caused by various wounds, autoimmune diseases, degenerative diseases and the like. Regarding the ankle joint, the ankle joint fusion commonly adopted can cause the patient to lose almost all the motion functions of the ankle joint, and the ankle joint replacement can retain partial motion functions of the ankle joint of the patient and can thoroughly solve the problems of pain and deformity of the ankle joint of the patient.

However, the existing ankle joint prosthesis applied to the ankle joint replacement mainly comprises three parts, namely a tibial plate, a talar plate and a polyethylene liner, wherein the tibial plate is used for being connected with a tibia in a human body through a tibia medullary cavity, the talar plate is used for being connected with a talus in the human body, and the polyethylene liner can freely slide relative to the tibial plate and the talar plate to realize the basic function of the ankle joint prosthesis. However, at least a part of the bone marrow cavity of the human body usually deviates from the central line of the bone marrow cavity in different directions to a certain extent, i.e. different shapes of the bone marrow cavity exist, while the overall structure of the tibial plate of the existing ankle joint prosthesis is a fixed structure, which cannot adapt to different shapes of the bone marrow cavity well, and after the existing ankle joint prosthesis is implanted into the human body with bone marrow cavities of different shapes, the connection between the tibial plate and the pad is unstable, particularly, the prosthesis is easy to loosen and fail along with the movement of the ankle joint of the human body, so that the stability of the existing ankle joint prosthesis is poor.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide an ankle joint prosthesis to the ankle joint prosthesis who solves among the prior art can not adapt to the problem of different shin bone pulp cavity shapes.

In order to achieve the above object, the present invention provides an ankle joint prosthesis, comprising: the tibia handle is arranged in a tibia marrow cavity of a human body so as to be connected with a tibia in the human body; a distal tibial prosthesis; a tibial connector disposed between the tibial stem and the tibial distal prosthesis such that the tibial stem and the tibial distal prosthesis are connected by the tibial connector; the tibia connector is provided with a first connecting part and a second connecting part, the second connecting part is used for being connected with the tibia handle, and the first connecting part is used for being connected with the tibia far-end prosthesis; the first connection portion has a first centerline and the second connection portion has a second centerline, the first centerline and the second centerline being arranged in parallel to adjust a position of the second centerline relative to a centerline of the distal tibial prosthesis by rotating the tibial connector relative to the distal tibial prosthesis.

Furthermore, the tibia handle is provided with a fixing hole, the second connecting portion is of a columnar structure, and the second connecting portion is inserted into the fixing hole.

Further, the periphery wall of the tibia handle is provided with a first locking hole which is communicated with the fixing hole, so that the tibia handle and the second connecting portion are relatively fixed through a locking nail which is arranged in the first locking hole in a penetrating mode.

Further, the outer peripheral wall of one end, facing the tibia handle, of the second connecting portion is provided with a first annular groove, and the locking nail penetrates through the first locking hole and abuts against the inner wall of the first annular groove.

Further, the cross-sectional area of the second connecting portion gradually decreases in a direction from the second connecting portion to the fixing hole; 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.

Furthermore, the first connecting part is a containing hole, the tibia far-end prosthesis comprises an inserting part, and the inserting part is inserted into the containing hole; the first center line is a hole center line of the accommodating hole.

Furthermore, the tibia connector is provided with a second locking hole which is communicated with the accommodating hole, so that the tibia connector and the inserting part are relatively fixed through a fastener penetrating through the second locking hole.

Further, the peripheral wall of the one end of inserting the portion towards the shin bone connector is provided with a second annular groove, and the fastener passes through the second locking hole and butt in the inner wall of second annular groove.

Furthermore, the inserting part is of a columnar structure, and the cross sectional area of the inserting part is gradually reduced along the inserting direction of the inserting part; 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.

Further, the shin bone connector includes connecting body, and first connecting portion and second connecting portion all set up on connecting body.

Furthermore, the tibia handle is of a columnar structure and comprises a first tibia section and a second tibia section, the first end of the second tibia section is used for being connected with the first tibia section, and the second end of the second tibia section is used for being connected with the tibia connector; the cross-sectional area of the first tibial segment gradually decreases in a direction in which the first tibial segment departs from the second tibial segment; the cross section of the first tibial segment is the area of the section, perpendicular to the extension direction of the tibial stem, of the first tibial segment.

Further, the ankle joint prosthesis further comprises: a pad assembly, at least a portion of the pad assembly being slidably connected with the distal tibial prosthesis; the spacer assembly is at least partially rotatably arranged on the calcar bone support, so that the spacer assembly drives the tibia far-end prosthesis and the tibia handle to rotate relative to the calcar bone support, and at least part of the calcar bone support is used for being connected with a talus in a human body.

Furthermore, the tibia far-end prosthesis is provided with a first curved surface structure, the gasket component is provided with a second curved surface structure which is attached to the first curved surface structure, and the first curved surface structure is matched with the second curved surface structure, so that the tibia far-end prosthesis and the gasket component move relatively under the matching of the first curved surface structure and the second curved surface structure.

Further, the first curved surface structure comprises a first concave curved surface, a second convex curved surface and a third concave curved surface, and the second convex curved surface is arranged between the first concave curved surface and the third concave curved surface; the second curved surface structure comprises a first convex curved surface matched with the first concave curved surface, a second concave curved surface matched with the second convex curved surface and a third convex curved surface matched with 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 gasket component slides relative to the tibia far-end prosthesis along the extending direction of the second concave curved surface.

Further, the liner subassembly includes the axis of rotation, and the talus holds in the palm has the rotation hole, and the axis of rotation is rotationally worn to locate in the rotation hole.

Further, the gasket assembly further comprises a gasket body, the rotating shaft is arranged on the gasket body, and the second curved surface structure is arranged on the gasket body.

Further, the talar tray includes: a pallet having a first rotation hole section; the bracket, the layer board sets up on the bracket, and the bracket has the second and rotates the hole section, and the second rotates the hole section and rotates the hole section intercommunication with formation and rotate the hole with first.

Further, be provided with the strengthening rib between bracket and the layer board, the strengthening rib has first lateral wall and second lateral wall, and the contact is laminated with at least part of the diapire of layer board to first lateral wall, and the contact is laminated with at least part of the periphery wall of bracket to the second lateral wall.

Further, the strengthening rib is a plurality of, and a plurality of strengthening ribs are around the periphery wall interval arrangement of bracket.

Furthermore, the bracket is of a columnar structure, and the cross section area of the bracket is gradually increased along the direction that the bracket is away from the supporting plate; the cross-sectional area of the bracket is the area of the cross-section of the bracket perpendicular to the extension direction of the bracket.

Furthermore, the tibia handle and the tibia connector are both made of titanium alloy materials, and the tibia far-end prosthesis is made of cobalt-chromium-molybdenum alloy materials; wherein, at least part of the wall surface of the peripheral wall of the tibial handle is coated with a hydroxyapatite coating.

Furthermore, the liner component is a polyethylene liner, and the talus support is made of cobalt-chromium-molybdenum alloy.

By applying the technical scheme of the utility model, the ankle joint prosthesis comprises a tibia handle, a tibia far-end prosthesis and a tibia connector, wherein the tibia handle is arranged in a tibia marrow cavity of a human body so as to connect the tibia handle with the tibia in the human body; the tibia connector is arranged between the tibia handle and the tibia far-end prosthesis, so that the tibia handle and the tibia far-end prosthesis are connected through the tibia connector; the tibia connector is provided with a first connecting part and a second connecting part, the second connecting part is used for being connected with the tibia handle, and the first connecting part is used for being connected with the tibia far-end prosthesis; the first connecting part is provided with a first central line, the second connecting part is provided with a second central line, and the first central line of the first connecting part and the second central line of the second connecting part are arranged in parallel, so when different marrow cavity shapes are met, i.e., at least a portion of the patient's medullary cavity, is offset in a different direction from the centerline of the medullary cavity, by using the ankle prosthesis and rotating the tibial connector, i.e. by moving the tibial connector relative to the tibial distal prosthesis to adjust the position of the second centerline relative to the centerline of the tibial distal prosthesis, thereby adjusting the position of the tibia handle relative to the tibia far-end prosthesis, under the condition that the position of the tibia far-end prosthesis is not changed, the tibial stem connected to the second connecting portion of the tibial connector can better accommodate the different intramedullary canal shapes described above, thereby solving the problem that the ankle joint prosthesis in the prior art can not adapt to different tibia medullary cavity shapes; moreover, the ankle joint prosthesis with the structure can keep better stability after being implanted into a human body, and the risk of loosening and failing of the ankle joint prosthesis in the human body is greatly reduced.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a schematic external structural view of an ankle prosthesis according to an embodiment of the invention;

FIG. 2 shows an internal cross-sectional structural view of the ankle prosthesis of FIG. 1;

FIG. 3 shows an exploded view of the tibial stem, tibial connector, and tibial distal prosthesis of the ankle prosthesis of FIG. 1;

FIG. 4 shows a schematic view of the tibial connector of the ankle prosthesis of FIG. 1; and

figure 5 shows an exploded view of the spacer assembly and the calcar of the ankle prosthesis of figure 1.

Wherein the figures include the following reference numerals:

10. an ankle joint prosthesis; 20. a tibial stem; 21. a first tibial segment; 23. a second tibial segment; 231. a fixing hole; 232. a first locking hole; 30. a distal tibial prosthesis; 31. a tibial distal body; 311. a first concave curved surface; 312. a second convex curved surface; 313. a third concave curved surface; 32. an insertion portion; 321. a second annular groove; 40. a tibial connector; 41. a first connection portion; 42. a second connecting portion; 421. a first annular groove; 43. a connecting body; 50. a liner assembly; 51. a gasket body; 511. a first convex curved surface; 512. a second concave curved surface; 513. a third convex curved surface; 52. a rotating shaft; 60. a bone plate; 61. a support plate; 62. a bracket; 63. and (5) reinforcing ribs.

Detailed Description

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

The present invention provides an ankle joint prosthesis 10, please refer to fig. 1 to 5, the ankle joint prosthesis 10 includes a tibia handle 20, a tibia far-end prosthesis 30 and a tibia connector 40, the tibia handle 20 is arranged in the tibia marrow cavity of the human body, so that the tibia handle 20 is connected with the tibia in the human body; tibial connector 40 is disposed between tibial stem 20 and tibial distal prosthesis 30 such that tibial stem 20 and tibial distal prosthesis 30 are connected by tibial connector 40; wherein, the tibia connector 40 has a first connecting part 41 and a second connecting part 42, the second connecting part 42 is used for connecting with the tibia stem 20, and the first connecting part 41 is used for connecting with the tibia far-end prosthesis 30; first coupling portion 41 has a first centerline and second coupling portion 42 has a second centerline, the first and second centerlines being arranged in parallel to adjust the position of the second centerline relative to the centerline of distal tibial prosthesis 30 by rotating tibial connector 40 relative to distal tibial prosthesis 30.

In the ankle joint prosthesis 10 of the present invention, the ankle joint prosthesis 10 includes a tibial stem 20, a tibial distal prosthesis 30 and a tibial connector 40, the tibial connector 40 has a first connecting portion 41 and a second connecting portion 42, and since the first central line of the first connecting portion 41 and the second central line of the second connecting portion 42 are arranged in parallel, when different shapes of the medullary cavity are encountered, i.e. at least a portion of the medullary cavity of a patient is deviated from the central line of the medullary cavity to a certain extent in different directions, the position of the second central line relative to the central line of the tibial distal prosthesis 30 can be adjusted by using the ankle joint prosthesis 10 and rotating the tibial connector 40, i.e. by rotating the tibial connector 40 relative to the tibial distal prosthesis 30, thereby adjusting the position of the tibial stem 20 relative to the tibial distal prosthesis 30, so that under the condition that the position of the tibial distal prosthesis 30 is not changed, the tibial stem 20 connected to the second connecting portion 42 of the tibial connector 40 can better accommodate the different intramedullary canal shapes described above, thereby solving the problem that the ankle joint prosthesis in the prior art cannot accommodate different tibial intramedullary canal shapes; moreover, the ankle prosthesis 10 of such a structure can maintain good stability after it is implanted into the human body, and the risk of loosening failure of the ankle prosthesis 10 in the human body is greatly reduced.

In a specific implementation process, the length and size of the tibial stem 20 can be selected according to actual requirements to better match the size of the cavity of the tibial medullary cavity; alternatively, the ankle prosthesis 10 may be selected such that the distance between the first and second centerlines is matched to the degree of deviation of at least a portion of the patient's medullary cavity from the centerline of the medullary cavity, thereby better matching the ankle prosthesis 10 to the patient's medullary cavity.

In order to realize the connection between the second connecting portion 42 and the tibial stem 20, as shown in fig. 3, the tibial stem 20 has a fixing hole 231, the second connecting portion 42 has 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. Alternatively, the fixing hole 231 is a cylindrical hole.

Specifically, the outer peripheral wall of the tibial stem 20 is provided with a first locking hole 232, the first locking hole 232 is communicated with the fixing hole 231, so that the tibial stem 20 and the second connecting part 42 are relatively fixed through a locking nail arranged in the first locking hole 232, that is, the tibial connector 40 and the tibial stem 20 are relatively fixed; the locking pin is respectively matched with the tibial stem 20 and the second connecting part 42 to stabilize the overall structure of the assembled tibial connector 40 and the tibial stem 20, so that the tibial connector 40 can be prevented from continuously rotating after the position of the tibial stem 20 relative to the tibial distal prosthesis 30 is adjusted, and the good adaptability of the tibial stem 20 and a tibial medullary cavity is damaged.

In a specific implementation process, the outer peripheral wall of one end of the second connecting portion 42 facing the tibial stem 20 is provided with a first annular groove 421, 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 facilitates assembly and disassembly of the tibial connector 40 and the tibial stem 20 and helps to provide stability to the overall structure of the tibial connector 40 and the tibial stem 20 when assembled. Alternatively, a locking hole corresponding to the position of the first locking hole 232 is formed in the second connecting portion 42, and a locking nail is inserted into the first locking hole 232 and the locking hole in sequence to fix the second connecting portion 42 and the tibial stem 20 relatively.

Specifically, the cross-sectional area of the second connecting portion 42 gradually decreases in the direction from the second connecting portion 42 to the fixing hole 231, 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 thereof, which makes the connection of the second connecting portion 42 to 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.

In order to realize the connection between the tibia distal end prosthesis 30 and the first connection portion 41, as shown in fig. 3, the first connection portion 41 is a receiving hole, the tibia distal end prosthesis 30 includes an insertion portion 32, and the insertion portion 32 is inserted into the receiving hole, so that the tibia distal end prosthesis 30 and the tibia connector 40 are relatively fixed; the first center line is a hole center line of the accommodating hole.

Specifically, the tibial connector 40 has a second locking hole, and the second locking hole is communicated with the receiving hole, so that the tibial connector 40 and the inserting portion 32 are relatively fixed through a fastener penetrating through the second locking hole, that is, the tibial distal prosthesis 30 and the tibial connector 40 are relatively fixed; the assembled tibial distal prosthesis 30 and tibial connector 40 are structurally stabilized by the cooperation of the fasteners with the tibial distal prosthesis 30 and tibial connector 40, respectively, to prevent rotation of the tibial distal prosthesis 30 after adjustment of the position of the tibial stem 20 relative to the tibial distal prosthesis 30, which in turn impairs the good adaptability of the tibial stem 20 to the tibial medullary canal.

In a specific implementation process, the outer peripheral wall of the insertion portion 32 facing the end of the tibial connector 40 is provided with a second annular groove 321, and the fastener passes through the second locking hole and abuts against the inner wall of the second annular groove 321. This connection facilitates assembly and disassembly of tibial connector 40 and tibial distal prosthesis 30 and helps to provide stability to the overall structure of tibial connector 40 and tibial distal prosthesis 30 when assembled. Alternatively, a limiting hole corresponding to the second locking hole is formed in the insertion portion 32, and a fastener is sequentially inserted into the second locking hole and the limiting hole to fix the insertion portion 32 and the tibial connector 40 relatively.

Specifically, the insertion portion 32 is a columnar structure, and accordingly, the accommodation hole is a columnar hole; the cross-sectional area of the insertion portion 32 gradually decreases in the insertion direction of the insertion portion 32, i.e., in the direction from the insertion portion 32 to the first connecting portion 41, wherein the cross-sectional area of the insertion portion 32 is the area of the cross-section of the insertion portion 32 perpendicular to the extending direction thereof, which makes the connection of the insertion portion 32 with the tibial connector 40 more stable and also makes the operation of inserting the insertion portion 32 into the receiving hole more convenient.

Specifically, the tibial connector 40 includes a connecting body 43, the first connecting portion 41 and the second connecting portion 42 are both provided on the connecting body 43; in a specific implementation process, the second connecting portion 42 is disposed on the upper portion of the connecting body 43, and the receiving hole is disposed on the bottom wall of the connecting body 43.

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, a first end of the second tibial segment 23 is used for connecting with the first tibial segment 21, and a second end of the second tibial segment 23 is used for connecting with the tibial connector 40; in a 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 section of the first tibial segment 21 perpendicular to the extension direction of the tibial stem 20; this can facilitate the insertion of the tibial stem 20 into the medullary canal of the tibia. Optionally, the end surface of the first tibial bone segment 21 away from the second tibial bone segment 23 is a hemispherical structure; the fixation hole 231 is provided at the bottom of the second tibial segment 23; the first locking hole 232 is disposed in the second tibial segment 23 near its bottom end.

Specifically, ankle joint prosthesis 10 further includes a pad assembly 50 and a talar plate 60, at least a portion of pad assembly 50 being slidably coupled to distal tibial prosthesis 30, at least a portion of pad assembly 50 being rotatably disposed on talar plate 60 such that pad assembly 50 causes distal tibial prosthesis 30 and tibial stem 20 to rotate relative to talar plate 60, at least a portion of talar plate 60 being adapted to be coupled to a talus within a human body. The ankle joint prosthesis 10 is formed by assembling the tibial stem 20, the tibial connector 40, the tibial distal prosthesis 30, the spacer assembly 50 and the talar plate 60, the assembled ankle joint prosthesis 10 making the implantation and removal of the ankle joint prosthesis 10 flexible and convenient; the sliding connection between the pad component 50 and the tibia far-end prosthesis 30 and the rotating connection between the pad component 50 and the talus support 60 can enable the pad component 50 to slide relative to the tibia far-end prosthesis 30 and rotate relative to the talus support 60 respectively, and meanwhile, the pad component 50 can also drive the tibia prosthesis component to rotate relative to the talus support 60, so that the ankle joint prosthesis 10 can enable the ankle joint of a patient to realize various motion forms after being implanted into a human body, and the problem that the motion form of the ankle joint prosthesis in the prior art is single is solved.

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

To achieve the sliding connection between the pad assembly 50 and the distal tibial prosthesis 30, the distal tibial prosthesis 30 has a first curved surface structure, the pad assembly 50 has a second curved surface structure for mating with the first curved surface structure, and the first curved surface structure and the second curved surface structure cooperate to allow the distal tibial prosthesis 30 and the pad assembly 50 to move relative to each other under the cooperation of the first curved surface structure and the second curved surface structure.

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, 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 comprises a first convex curved surface 511 matched with the first concave curved surface 311, a second concave curved surface 512 matched with the second convex curved surface 312 and a third convex curved surface 513 matched with the third concave curved surface 313; the first concave curved surface 311 is slidably contacted with the first convex curved surface 511, the second convex curved surface 312 is slidably contacted with the second concave curved surface 512, and the third concave curved surface 313 is slidably contacted with the third convex curved surface 513, so that the cushion component 50 slides relative to the tibial distal prosthesis 30 along the extending direction of the second concave curved surface 512; meanwhile, the first concave curved surface 311, the second concave curved surface 512, and the third concave curved surface 313 also respectively limit the first convex curved surface 511, the second convex curved surface 312, and the third convex curved surface 513 to a certain extent, 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, which not only ensures that the pad component 50 can slide within a certain range relative to the tibial distal prosthesis 30, but also prevents the pad component 50 from completely separating from the tibial distal prosthesis 30, thereby ensuring the stability of the overall structure of the ankle joint prosthesis 10.

Optionally, at least part of the first concave curved surface 311 and at least part of the third concave curved surface 313 are on the same arc-shaped surface, and correspondingly, at least part of the first convex curved surface 511 and at least part of the third convex curved surface 513 are on the same arc-shaped surface.

In a specific implementation process, the tibial distal prosthesis 30 further includes a tibial distal body 31, and the insertion portion 32 and the first curved surface structure are disposed on the tibial distal body 31. Optionally, the inserting portion 32 is disposed on the upper portion of the distal tibial end body 31, and the first concave curved surface 311, the second convex curved surface 312 and the third concave curved surface 313 are disposed on the bottom wall of the distal tibial end body 31.

In order to realize the rotational connection between the cushion assembly 50 and the talus support 60, the cushion assembly 50 includes a rotation shaft 52, the talus support 60 has a rotation hole, the rotation shaft 52 is rotatably disposed in the rotation hole, so that the cushion assembly 50 can rotate relative to the talus support 60, and the cushion assembly 50 drives the tibial prosthetic component to rotate relative to the talus support 60.

Specifically, the cushion assembly 50 further includes a cushion body 51; the rotating shaft 52 is disposed on the gasket body 51, and the second curved surface structure is disposed on the gasket body 51. In a specific implementation, 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 pad body 51, and the rotating shaft 52 is disposed at the lower portion of the pad body 51.

Specifically, talar tray 60 includes a plate 61 and a socket 62; the plate 61 has a first rotation hole section; layer board 61 sets up on bracket 62, and bracket 62 has the second and rotates the hole section, and the hole section is rotated with first rotation hole section intercommunication in order to form and rotate the hole to the second. In the specific implementation, the support plate 61 is disposed on the upper portion of the bracket 62.

In order to provide a more stable support for plate 61 and to provide a more stable overall talar 60, a rib 63 is provided between bracket 62 and plate 61, rib 63 having a first side wall in abutting contact with at least a portion of the bottom wall of plate 61 and a second side wall in abutting contact with at least a portion of the peripheral wall of bracket 62. Alternatively, the reinforcing rib 63 is a substantially triangular plate, and adjacent two sidewalls thereof are a first sidewall and a second sidewall, respectively.

In the specific implementation process, the reinforcing ribs 63 are multiple, and the plurality of reinforcing ribs 63 are arranged around the outer peripheral wall of the bracket 62 at intervals, so that the supporting effect of the plurality of reinforcing ribs 63 on the supporting plate 61 is balanced.

In the specific implementation process, the bracket 62 is a columnar structure, and the cross-sectional area of the bracket 62 is gradually increased along the direction in which the bracket 62 deviates from the supporting plate 61; wherein the cross-sectional area of bracket 62 is the area of a cross-section of bracket 62 perpendicular to the direction of extension of bracket 62; this can further stabilize the supporting action of bracket 62 on blade 61.

In a specific implementation, the liner assembly 50 is a polyethylene liner, preferably an ultra-high molecular weight polyethylene liner; the calcaneus 60 and the tibia far-end prosthesis 30 are both made of cobalt-chromium-molybdenum alloy materials; the tibia handle 20 and the tibia connector 40 are both made of titanium alloy materials, at least part of the wall surface of the outer peripheral wall of the tibia handle 20 is coated with a hydroxyapatite coating, the hydroxyapatite coating has a function of inducing growth of bone cells, the bone cells induced and grown are beneficial to enabling the tibia handle 20 to be inserted into the bone marrow cavity more stably, and then the ankle joint prosthesis 10 implanted into a human body is enabled to be more stable.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

in the ankle joint prosthesis 10 of the present invention, the ankle joint prosthesis 10 includes a tibia stem 20, a tibia distal end prosthesis 30, and a tibia connector 40, the tibia stem 20 being arranged in a tibia marrow cavity of a human body so that the tibia stem 20 is connected to a tibia in the human body; tibial connector 40 is disposed between tibial stem 20 and tibial distal prosthesis 30 such that tibial stem 20 and tibial distal prosthesis 30 are connected by tibial connector 40; wherein, the tibia connector 40 has a first connecting part 41 and a second connecting part 42, the second connecting part 42 is used for connecting with the tibia stem 20, and the first connecting part 41 is used for connecting with the tibia far-end prosthesis 30; since the first connecting portion 41 has a first center line and the second connecting portion 42 has a second center line, since the first center line of the first connecting portion 41 and the second center line of the second connecting portion 42 are arranged in parallel, when different bone marrow cavity shapes are encountered, that is, when at least a portion of a patient's bone marrow cavity is encountered to deviate from the center line of the bone marrow cavity in different directions to some extent, the position of the second center line with respect to the center line of the tibial distal prosthesis 30 can be adjusted by using the present ankle prosthesis 10 and rotating the tibial connector 40, that is, by rotating the tibial connector 40 with respect to the tibial distal prosthesis 30, and further adjusting the position of the tibial stem 20 with respect to the tibial distal prosthesis 30, so that the tibial stem 20 connected to the second connecting portion 42 of the tibial connector 40 can better adapt to the different bone marrow cavity shapes without changing the position of the tibial distal prosthesis 30, thereby solving the problem that the ankle joint prosthesis in the prior art can not adapt to different tibia medullary cavity shapes; moreover, the ankle prosthesis 10 of such a structure can maintain good stability after it is implanted into the human body, and the risk of loosening failure of the ankle prosthesis 10 in the human body is greatly reduced.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ankle prosthesis, comprising:

a tibial stem (20) for placement within a tibial medullary cavity of a human body to couple the tibial stem (20) to a tibia within 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 tibial distal prosthesis (30) such that the tibial stem (20) and the tibial distal prosthesis (30) are connected by the tibial connector (40);

wherein the tibial connector (40) has a first connection portion (41) and a second connection portion (42), the second connection portion (42) being for connection with the tibial stem (20), the first connection portion (41) being for connection with the tibial distal prosthesis (30); the first connection portion (41) has a first centerline and the second connection portion (42) has a second centerline, the first centerline and the second centerline being arranged in parallel to adjust a position of the second centerline relative to a centerline of the distal tibial prosthesis (30) by rotating the tibial connector (40) relative to the distal tibial prosthesis (30).

2. The ankle joint prosthesis according to claim 1, wherein 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).

3. The ankle joint prosthesis according to claim 2, characterized in that the peripheral wall of the tibial stem (20) is provided with a first locking hole (232), the first locking hole (232) communicating with the fixing hole (231) to relatively fix the tibial stem (20) and the second connection portion (42) by a locking nail inserted into the first locking hole (232).

4. The ankle joint prosthesis according to claim 3, characterized in that the peripheral wall of the second connection portion (42) towards the end of the shank (20) is provided with a first annular groove (421), the locking peg passing through the first locking hole (232) and abutting against the inner wall of the first annular groove (421).

5. The ankle joint prosthesis according to claim 2, wherein the cross-sectional area of the second connecting portion (42) is gradually reduced in a direction from the second connecting portion (42) to the fixing hole (231); wherein the cross-sectional area of the second connection portion (42) is an area of a cross-section of the second connection portion (42) perpendicular to an extending direction of the second connection portion (42).

6. The ankle prosthesis according to claim 1, wherein the first connecting portion (41) is a receiving hole, and the distal tibial prosthesis (30) includes an insertion portion (32), the insertion portion (32) being inserted in the receiving hole; the first center line is a hole center line of the accommodating hole.

7. The ankle joint prosthesis according to claim 6, characterized in that the tibial connector (40) has a second locking hole communicating with the receiving hole to fix the tibial connector (40) with respect to the insertion portion (32) by means of a fastener threaded in the second locking hole.

8. The ankle prosthesis according to claim 7, characterized in that the peripheral wall of the insert portion (32) facing the end of the tibial connector (40) is provided with a second annular groove (321), the fastener passing through the second locking hole and abutting against the inner wall of the second annular groove (321).

9. The ankle joint prosthesis according to claim 6, wherein the insertion portion (32) is a columnar structure, and the cross-sectional area of the insertion portion (32) is gradually reduced in an insertion direction of the insertion portion (32); the cross-sectional area of the inserting portion (32) is the area of the cross section of the inserting portion (32) perpendicular to the extending direction of the inserting portion (32).

10. The ankle joint prosthesis according to claim 1, characterized in that the tibial connector (40) comprises a connecting body (43), the first connecting portion (41) and the second connecting portion (42) being provided on the connecting body (43).

11. The ankle joint prosthesis according to claim 1, characterized in that the tibial stem (20) is of a cylindrical configuration, the tibial stem (20) comprising a first tibial segment (21) and a second tibial segment (23), a first end of the second tibial segment (23) being intended to be connected with the first tibial segment (21), a second end of the second tibial segment (23) being intended to be connected with the tibial connector (40);

the cross-sectional area of the first tibial segment (21) decreases progressively in a direction in which the first tibial segment (21) faces away from the second tibial segment (23); wherein the cross section of the first tibial segment (21) is the area of a section of the first tibial segment (21) perpendicular to the extension direction of the tibial stem (20).

12. The ankle prosthesis of claim 1 further comprising:

a pad assembly (50), at least a portion of the pad assembly (50) being slidably connected with the distal tibial prosthesis (30);

a calcar (60), at least a portion of said spacer assembly (50) being rotatably disposed on said calcar (60) such that said spacer assembly (50) rotates said distal tibial prosthesis (30) and said tibial stem (20) relative to said calcar (60), at least a portion of said calcar (60) being adapted to be coupled to a talus bone within a human body.

13. The ankle joint prosthesis according to claim 12, wherein the distal tibial prosthesis (30) has a first curved surface configuration and the pad assembly (50) has a second curved surface configuration for conforming to the first curved surface configuration, the first curved surface configuration cooperating with the second curved surface configuration to allow relative movement between the distal tibial prosthesis (30) and the pad assembly (50) upon cooperation of the first curved surface configuration and the second curved surface configuration.

14. The ankle joint prosthesis according to claim 13, wherein the first curved surface structure comprises 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) being disposed between the first concave curved surface (311) and the third concave curved surface (313);

the second curved surface structure comprises a first convex curved surface (511) matched with the first concave curved surface (311), a second concave curved surface (512) matched with the second convex curved surface (312) and a third convex curved surface (513) matched with 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 pad component (50) slides relative to the tibia far-end prosthesis (30) along the extending direction of the second concave curved surface (512).

15. The ankle prosthesis according to claim 14, characterized in that the padding assembly (50) comprises:

the bone plate comprises a rotating shaft (52), the calcar (60) is provided with a rotating hole, and the rotating shaft (52) is rotatably arranged in the rotating hole in a penetrating mode.

16. The ankle prosthesis according to claim 15, wherein the cushion assembly (50) further comprises:

the rotating shaft (52) is arranged on the gasket body (51), and the second curved surface structure is arranged on the gasket body (51).

17. The ankle joint prosthesis according to claim 15, characterized in that the calcar (60) comprises:

a blade (61), the blade (61) having a first rotation hole section;

a bracket (62), the layer board (61) set up on bracket (62), bracket (62) have the second rotate the hole section, the second rotate the hole section with first rotate the hole section intercommunication in order to form rotate the hole.

18. The ankle joint prosthesis according to claim 17, characterized in that a reinforcement rib (63) is arranged between the receptacle (62) and the plate (61), the reinforcement rib (63) having a first side wall in abutting contact with at least a part of the bottom wall of the plate (61) and a second side wall in abutting contact with at least a part of the peripheral wall of the receptacle (62).

19. The ankle prosthesis according to claim 18, wherein the reinforcing rib (63) is provided in a plurality, the plurality of reinforcing ribs (63) being arranged at intervals around the peripheral wall of the socket (62).

20. The ankle prosthesis according to claim 17, wherein the bracket (62) has a cylindrical configuration, the bracket (62) having a cross-sectional area that increases in a direction in which the bracket (62) faces away from the blade (61); wherein the cross-sectional area of the bracket (62) is the area of a cross-section of the bracket (62) perpendicular to the direction of extension of the bracket (62).

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

22. The ankle prosthesis according to claim 12, wherein the spacer element (50) is a polyethylene spacer and the calcar (60) is made of a cobalt chromium molybdenum alloy.