阅读说明：本技术 人工踝关节假体组件 (Artificial ankle joint prosthesis assembly ) 是由 赵大航 马昕 王少白 王旭 范云平 黄加张 黄迪超 张弓晧 张超 陈立 王晨 于 2018-08-24 设计创作，主要内容包括：本发明提供一种人工踝关节假体组件,包括：距骨植入件、胫骨组件和内衬块；距骨假体本体的内侧部包括相连接的内侧前部和内侧后部,外侧部包括相连接的外侧前部和外侧后部；内侧后顶圆弧面的半径大于内侧前顶圆弧面的半径；内侧后顶圆弧面的半径大于外侧前顶圆弧面的半径；内侧后顶圆弧面的半径大于外侧后顶圆弧面的半径；内弧形凹陷部的曲率半径等于内侧后顶圆弧面的半径,外弧形凹陷部的曲率半径等于外侧后顶圆弧面的半径；内弧形凹陷部的外侧壁与外弧形凹陷部的内侧壁相交处形成底部凸出边沿；内衬块的底部凸出边沿插入距骨顶部凹缝中；衬块顶面与胫骨组件连接。本发明的人工踝关节假体组件用于在踝关节置换手术中。(The invention provides an artificial ankle joint prosthesis assembly comprising: a talar implant, a tibial component, and a lining block; the medial portion of the talar prosthesis body comprises a medial anterior portion and a medial posterior portion which are connected, and the lateral portion comprises a lateral anterior portion and a lateral posterior portion which are connected; the radius of the inner side rear top arc surface is larger than that of the inner side front top arc surface; the radius of the inner side rear top arc surface is larger than that of the outer side front top arc surface; the radius of the inner rear top arc surface is larger than that of the outer rear top arc surface; the curvature radius of the inner arc-shaped concave part is equal to the radius of the inner rear top arc surface, and the curvature radius of the outer arc-shaped concave part is equal to the radius of the outer rear top arc surface; the intersection of the outer side wall of the inner arc-shaped concave part and the inner side wall of the outer arc-shaped concave part forms a bottom convex edge; the bottom convex edge of the inner filler block is inserted into the concave slot at the top of the talus; the top surface of the pad is connected to the tibial component. The artificial ankle joint prosthesis assembly of the present invention is used in an ankle joint replacement procedure.)

1. An artificial ankle joint prosthesis assembly comprising: a talar implant, a tibial component, and a lining block (400); characterized in that the talus implant is for mounting on a calcaneus bone (10), the medial side of the talus implant being closer to a tibia (20) than the lateral side of the talus implant, the anterior side of the talus implant being closer to a toe than the posterior side of the talus implant;

the talar implant comprising: a talar prosthesis body (100) having a support plane (101) on a bottom surface of the talar prosthesis body (100);

the talar prosthesis body (100) comprises a medial side and a lateral side connected; the medial portion comprising a connected medial anterior portion (110) and a medial posterior portion (120), the lateral portion comprising a connected lateral anterior portion (130) and a lateral posterior portion (140);

the top surface of the inner front part (110) is an inner front top arc surface (111), and the top surface of the inner rear part (120) is an inner rear top arc surface (121); the inner side front top arc surface (111) is tangent to the inner side rear top arc surface (121); the inner side front top arc surface (111) and the inner side rear top arc surface (121) are both downwards concave along the direction from inside to outside;

the top surface of the outer front part (130) is an outer front top arc surface (131), and the top surface of the outer rear part (140) is an outer rear top arc surface (141); the outer side front top arc surface (131) is tangent to the outer side rear top arc surface (141); the outer side front top arc surface (131) and the outer side rear top arc surface (141) are both sunken downwards along the direction from outside to inside;

the lateral surface of the medial anterior portion (110) is connected and coplanar with the medial surface of the lateral anterior portion (130), and the lateral surface of the medial posterior portion (120) is connected and coplanar with the medial surface of the lateral posterior portion (140); the top of the junction of the inner front part (110) and the outer front part (130) forms a front side sunken seam (150), and the top of the junction of the inner rear part (120) and the outer rear part (140) forms a rear side sunken seam (160); the anterior concave joint (150) is connected with the posterior concave joint (160) to form a talar roof concave joint;

the distance between the highest point of the tangent position of the inner side front top arc surface (111) and the inner side rear top arc surface (121) and the supporting plane (101) is the height of the inner side highest tangent point; the distance between the highest point of the tangent position of the outer side front top arc surface (131) and the outer side rear top arc surface (141) and the supporting plane (101) is the height of the highest tangent point of the outer side; the height of the highest tangent point at the inner side is greater than that of the highest tangent point at the outer side;

the radius of the inner side rear top arc surface (121) is larger than that of the inner side front top arc surface (111); the radius of the inner side rear top arc surface (121) is larger than that of the outer side front top arc surface (131); the radius of the inner side rear top arc surface (121) is larger than that of the outer side rear top arc surface (141);

the inner pad (400) having a pad top surface (410) and a pad bottom surface (420) disposed opposite one another;

a pad bottom surface (420) of the inner pad (400) is in contact with a top of the talar prosthesis body (100), and an inner arc-shaped recess portion (421) and an outer arc-shaped recess portion (422) are provided on the pad bottom surface (420) of the inner pad (400) along an inward-outward direction of the inner pad (400); the curvature radius of the inner arc-shaped concave part (421) is equal to the radius of the inner rear top arc surface (121), and the curvature radius of the outer arc-shaped concave part (422) is equal to the radius of the outer rear top arc surface (141); a bottom convex edge (423) is formed at the intersection of the outer side wall of the inner arc-shaped concave part (421) and the inner side wall of the outer arc-shaped concave part (422); the bottom projecting edge (423) of the inner pad (400) is inserted into and movable along the talus top notch;

the top pad surface (410) is coupled to the tibial component for mounting to the bottom of a tibia (20).

2. The artificial ankle joint prosthesis assembly according to claim 1, wherein: -the front side (401) of the inner pad (400) and the rear side (402) of the inner pad (400) are both circular arc surfaces; the inner side surface (403) of the inner lining block (400) and the outer side surface (404) of the inner lining block (400) are planes parallel to each other.

3. The artificial ankle joint prosthesis assembly according to claim 1, wherein: the radius of the outer side front top arc surface (131) is less than or equal to that of the outer side rear top arc surface (141), and the radius of the inner side front top arc surface (111) is less than or equal to that of the outer side front top arc surface (131).

4. The artificial ankle joint prosthesis assembly according to claim 3, wherein:

any plane of the front part parallel to the internal and external directions of the talus prosthesis body (100) and vertical to the supporting plane (101) is a vertical plane of the front part; the intersection line of any one front vertical surface and the outer side surface of the inner front part (110) is a front intersection line; a distance between the anterior intersection line and a medial side (112) of the medial anterior portion (110) is a width of the medial anterior portion (110) and a distance between the anterior intersection line and a lateral side (132) of the lateral anterior portion (130) is a width of the lateral anterior portion (130) in a medial-lateral direction of the talar prosthesis body (100);

-the width of the medial anterior portion (110) and the width of the lateral anterior portion (130) both decrease in succession along the anterior-posterior direction of the talar prosthesis body (100), the width of the medial anterior portion (110) being greater than the width of the lateral anterior portion (130) on the same anterior vertical plane;

any plane of the back part parallel to the internal and external directions of the talus prosthesis body (100) and vertical to the supporting plane (101) is a back vertical plane; the intersection line of any one rear vertical surface and the outer side surface of the inner rear part (120) is a rear intersection line; the distance between the posterior intersection line and the medial side (122) of the medial posterior (120) is the width of the medial posterior (120) and the distance between the posterior intersection line and the lateral side (142) of the lateral posterior (140) is the width of the lateral posterior (140) in the medial-lateral direction of the talar prosthesis body (100);

along the fore-aft direction of talar prosthesis body (100), the width of medial posterior portion (120) and the width of lateral posterior portion (140) both decrease in order, and on the same posterior vertical plane, the width of medial posterior portion (120) is greater than the width of lateral posterior portion (140).

5. The artificial ankle joint prosthesis assembly according to claim 3, wherein: the front side (113) of the inner front part (110) is a circular arc line which is concave backwards; the rear side edge (123) of the inner rear part (120) is a forward-concave arc line; the front side edge (133) of the outer side front part (130) is a circular arc line which is concave backwards; the rear side (143) of the outer rear part (140) is a forward concave circular arc line.

6. The artificial ankle joint prosthesis assembly according to claim 5, wherein:

a first inner front fillet part (114) is arranged at the intersection of the inner front top arc surface (111) and the inner side surface (112) of the inner front part (110); the front side edge of the first inner front fillet part (114) is a circular arc edge;

a first inner rear fillet part (124) is arranged at the intersection of the inner rear top arc surface (121) and the inner side surface (122) of the inner rear part (120); the rear side edge of the first inner rear fillet part (124) is a circular arc edge;

a first outer front fillet part (134) is arranged at the intersection of the outer front top arc surface (131) and the outer side surface (132) of the outer front part (130); the front side edge of the first outer front fillet part (134) is a circular arc edge;

a first outer rear fillet part (144) is arranged at the intersection of the outer rear top arc surface (141) and the outer side surface (142) of the outer rear part (140); the rear side edge of the first outer rear fillet part (144) is a circular arc edge.

7. The artificial ankle joint prosthesis assembly according to claim 6, wherein: the front side of the first inner front fillet (114) is tangent to the front side (113) of the inner front (110); a rear side of the first inner rear fillet (124) is tangent to a rear side (123) of the inner rear (120); a front side of the first outer front fillet (134) is tangent to a front side (133) of the outer front (130); the rear side of the first lateral rear fillet (144) is tangent to the rear side (143) of the lateral rear portion (140).

8. The artificial ankle joint prosthesis assembly according to claim 7, wherein: the talar prosthesis body (100) is also provided with a notch (102) on the bottom surface, and the notch (102) penetrates to the inner side and the outer side of the talar prosthesis body (100).

9. The artificial ankle joint prosthesis assembly according to claim 8, wherein:

the cross section of the notch (102) is a trapezoidal section; the notch (102) is provided with a front inclined surface (1021) and a rear inclined surface (1022) which are opposite, the front inclined surface (1021) is arranged at the front side of the rear inclined surface (1022), an upper bottom surface (1023) is connected between the front inclined surface (1021) and the rear inclined surface (1022), and the upper bottom surface (1023) is parallel to the supporting plane (101).

10. The artificial ankle joint prosthesis assembly according to claim 9, wherein: an inner anchoring part (210) and an outer anchoring part (220) are arranged on the talar prosthesis body (100), the inner anchoring part (210) and the outer anchoring part (220) are both installed on the front inclined surface (1021), the inner anchoring part (210) is located on the inner side front part (110), and the outer anchoring part (220) is located on the outer side front part (130).

11. The artificial ankle joint prosthesis assembly according to claim 1, wherein:

the tibial component, comprising: a tibial prosthesis (3100) and a tibial connection portion (3200) connected to the tibial prosthesis (3100); the tibial prosthesis (3100) is a plate body, the tibial prosthesis (3100) has a plate body top surface (3110), a plate body bottom surface (3120) and a plate body circumferential side surface (3130) between the plate body top surface (3110) and the plate body bottom surface (3120), the plate body top surface (3110) is connected to the tibial connection portion (3200), the plate body top surface (3110) and the plate body bottom surface (3120) are parallel to each other and have the same shape, and the plate body circumferential side surface (3130) is formed along the contour of the plate body top surface (3110);

the plate body circumferential side surface (3130) comprises a front side arc-shaped surface (3131), a concave arc-shaped surface (3133), a rear side arc-shaped surface (3135) and a vertical side surface (3137) which are sequentially connected, the front side arc-shaped surface (3131) and the rear side arc-shaped surface (3135) are oppositely arranged, and the concave arc-shaped surface (3133) and the vertical side surface (3137) are oppositely arranged; the front side arc face (3131) and the rear side arc face (3135) are outwardly convex, the depressed arc face (3133) is inwardly depressed, and the vertical side face (3137) is a plane perpendicular to the plate body bottom face (3120);

the pad top surface (410) is connected to the plate body bottom surface (3120).

12. The artificial ankle joint prosthesis assembly according to claim 11, wherein:

the front side arc-shaped face (3131) and the concave arc-shaped face (3133) are connected through a front concave side arc-shaped face (3132), and the front side arc-shaped face (3131) and the concave arc-shaped face (3133) are tangent to the front concave side arc-shaped face (3132);

the rear side arc-shaped face (3135) and the concave arc-shaped face (3133) are connected through a rear concave side arc-shaped face (3134), and the rear side arc-shaped face (3135) and the concave arc-shaped face (3133) are both tangent to the rear concave side arc-shaped face (3134);

the vertical side surface (3137) and the rear side arc-shaped surface (3135) are connected through a rear vertical side arc-shaped surface (3136), and the vertical side surface (3137) and the rear side arc-shaped surface (3135) are tangent to the rear vertical side arc-shaped surface (3136);

the front side arc face (3131) and the vertical side face (3137) are connected through a front vertical side arc face (3138), and the front side arc face (3131) and the vertical side face (3137) are tangent to the front vertical side arc face (3138);

-in a direction parallel to the vertical side (3137), the tangent (3141) of the front arched face (3131) to the front vertical arched face (3138) is in front of the tangent (3142) of the front arched face (3131) to the front concave arched face (3132), the tangent (3143) of the rear arched face (3135) to the rear vertical arched face (3136) is in front of the tangent (3144) of the rear arched face (3135) to the rear concave arched face (3134);

the tangent (3144) of the rear side arcuate face (3135) to the rear concave side arcuate face (3134) is closer to the vertical side face (3137) than the tangent (3142) of the front side arcuate face (3131) to the front concave side arcuate face (3132) is to the tangent (3144) of the rear side arcuate face (3135) to the rear concave side arcuate face (3134) in a direction perpendicular to the vertical side face (3137).

13. The artificial ankle joint prosthesis assembly according to claim 12, wherein: the tangent (3146) of the concave arcuate face (3133) to the rear concave arcuate face (3134) is closer to the vertical side face (3137) than the tangent (3145) of the front concave arcuate face (3132) to the concave arcuate face (3133), the tangent (3146) of the concave arcuate face (3133) to the rear concave arcuate face (3134), and the tangent (3146) of the concave arcuate face (3133) to the rear concave arcuate face (3134) is closer to the vertical side face (3137) in a direction perpendicular to the vertical side face (3137).

14. The artificial ankle joint prosthesis assembly according to claim 11, wherein: the tibia connecting portion (3200) is provided with a plurality of column bodies (3210), all the column bodies (3210) are obliquely arranged relative to the top surface (3110) of the plate body, and the oblique directions of all the column bodies (3210) are the same.

15. The artificial ankle joint prosthesis assembly according to claim 11, wherein:

a convex strip (3121) is arranged on the bottom surface (3120) of the plate body;

the top surface (410) of the inner lining block (400) is a plane, and a clamping groove (430) for clamping the convex strip (3121) is arranged on the top surface (410) of the inner lining block (400).

Technical Field

The invention relates to the technical field of medical prosthesis structures, in particular to an artificial ankle joint prosthesis component.

Background

The ankle joint is composed of the joint surface of the lower ends of the tibia and the fibula and the talus pulley, so the ankle joint is also called as talus calf joint. The lower joint surface of the tibia, the inner ankle joint surface and the outer ankle joint surface jointly form a joint socket for accommodating the talar pulley, and the wider front part enters the socket when the foot dorsiflexes due to the fact that the front part of the pulley joint surface is wider and narrower; however, in plantarflexion, when the narrower posterior portion of the pulley enters the socket during downhill walking, the ankle joint becomes loose and can move laterally, and sprain is likely to occur in the ankle joint, and most of them, inversion injury is observed, and the ankle is longer and lower than the medial malleolus, so that the ankle is prevented from being excessively everted.

The talus is the second largest tarsal bone of the human body, which is critical to ankle function and biomechanics. Studies have shown that the curvature of the medial and lateral vault of the talus is asymmetric, and that the curvature of the medial and lateral vault is not uniform in front and behind, respectively. At present, the shape of the cross section of the tibial prosthesis of the tibial component is mostly an oblique rectangle, a trapezoid or an ellipse.

How to design an artificial ankle joint prosthesis component which conforms to the structure of the Asian ankle joint is a problem to be solved by the technical personnel in the field.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem underlying the present invention is to provide an artificial ankle joint prosthesis assembly.

To achieve the above and other related objects, the present invention provides an artificial ankle joint prosthesis assembly comprising: a talar implant, a tibial component, and a lining block; the talar implant for mounting on a calcaneus bone, the medial side of the talar implant being closer to the tibia than the lateral side of the talar implant, the anterior side of the talar implant being closer to the toe than the posterior side of the talar implant; the talar implant comprising: a talar prosthesis body having a support plane on a bottom surface thereof; the talar prosthesis body comprises a medial side and a lateral side which are connected; the medial portion comprises a medial anterior portion and a medial posterior portion connected, and the lateral portion comprises a lateral anterior portion and a lateral posterior portion connected; the top surface of the front part of the inner side is an inner side front top arc surface, and the top surface of the rear part of the inner side is an inner side rear top arc surface; the inner side front top arc surface is tangent with the inner side rear top arc surface; the inner side front top arc surface and the inner side rear top arc surface are both sunken downwards along the direction from inside to outside; the top surface of the front part of the outer side is an outer front top arc surface, and the top surface of the rear part of the outer side is an outer rear top arc surface; the outer side front top circular arc surface is tangent with the outer side rear top circular arc surface; the outer side front top arc surface and the outer side rear top arc surface are both sunken downwards along the direction from outside to inside; the outer side surface of the inner front part is connected with and coplanar with the inner side surface of the outer front part, and the outer side surface of the inner rear part is connected with and coplanar with the inner side surface of the outer rear part; the top of the joint of the inner front part and the outer front part forms a front side sunken seam, and the top of the joint of the inner rear part and the outer rear part forms a rear side sunken seam; the front side concave seam is connected with the rear side concave seam to form a talus top concave seam; the distance between the highest point of the tangent position of the inner side front top arc surface and the inner side rear top arc surface and the supporting plane is the height of the inner side highest tangent point; the distance between the highest point of the tangent position of the outer side front top circular arc surface and the outer side rear top circular arc surface and the supporting plane is the height of the highest tangent point of the outer side; the height of the highest tangent point at the inner side is greater than that of the highest tangent point at the outer side; the radius of the inner side rear top arc surface is larger than that of the inner side front top arc surface; the radius of the inner side rear top arc surface is larger than that of the outer side front top arc surface; the radius of the inner side rear top arc surface is larger than that of the outer side rear top arc surface; the inner backing block is provided with a backing block top surface and a backing block bottom surface which are oppositely arranged; a pad bottom surface of the inner pad is in contact with a top of the talar prosthesis body, and an inner arc-shaped recess portion and an outer arc-shaped recess portion are formed in the pad bottom surface of the inner pad along an inner and outer direction of the inner pad; the curvature radius of the inner arc-shaped concave part is equal to the radius of the inner rear top arc surface, and the curvature radius of the outer arc-shaped concave part is equal to the radius of the outer rear top arc surface; the intersection of the outer side wall of the inner arc-shaped concave part and the inner side wall of the outer arc-shaped concave part forms a bottom convex edge; the inner pad has a bottom convex edge inserted into and movable along the talus top notch; the top surface of the pad is coupled to the tibial component for mounting to the bottom of a tibia.

Preferably, the front side of the inner pad and the rear side of the inner pad are both circular arc surfaces; the inner side surface of the inner pad and the outer side surface of the inner pad are planes parallel to each other.

Preferably, the radius of the outer side front top arc surface is less than or equal to the radius of the outer side rear top arc surface, and the radius of the inner side front top arc surface is less than or equal to the radius of the outer side front top arc surface.

Further, any plane of the front part parallel to the internal and external directions of the talus prosthesis body and vertical to the supporting plane is a front vertical plane; the intersection line of any one front vertical surface and the outer side surface of the front part of the inner side is a front intersection line; a distance between the anterior intersection line and a medial side of the medial anterior portion is a width of the medial anterior portion and a distance between the anterior intersection line and a lateral side of the lateral anterior portion is a width of the lateral anterior portion along a medial-lateral direction of the talar prosthesis body; the width of the inner anterior part and the width of the outer anterior part are sequentially reduced along the anterior-posterior direction of the talar prosthesis body, and the width of the inner anterior part is larger than that of the outer anterior part on the same anterior vertical plane; any plane of the back part parallel to the internal and external directions of the talus prosthesis body and vertical to the support plane is a back part vertical plane; the intersection line of any one rear vertical surface and the outer side surface of the inner rear part is a rear intersection line; along the medial-lateral direction of the talar prosthesis body, the distance between the posterior intersection line and the medial side of the medial posterior portion is the width of the medial posterior portion, and the distance between the posterior intersection line and the lateral side of the lateral posterior portion is the width of the lateral posterior portion; along the fore-and-aft direction of talus prosthesis body, the width at inboard rear portion with the width at outside rear portion all reduces in proper order, on same rear portion vertical plane, the width at inboard rear portion is greater than the width at outside rear portion.

Further, the front side edge of the front part of the inner side is a circular arc line which is concave backwards; the rear side edge of the rear part of the inner side is a forward sunken circular arc line; the front side edge of the front part of the outer side is a circular arc line which is concave backwards; the rear side edge of the rear part of the outer side is a forward sunken circular arc line.

Furthermore, a first inner front fillet part is arranged at the intersection of the inner front top arc surface and the inner side surface of the inner front part; the front side edge of the first inner front fillet part is a circular arc edge; a first inner rear fillet part is arranged at the intersection of the inner rear top arc surface and the inner side surface of the inner rear part; the rear side edge of the first inner rear fillet part is a circular arc edge; a first outer front fillet part is arranged at the intersection of the outer front top arc surface and the outer side surface of the outer front part; the front side edge of the first outer front fillet part is a circular arc edge; a first outer rear fillet part is arranged at the intersection of the outer rear top arc surface and the outer side surface of the outer rear part; the rear side edge of the first outer side rear fillet part is a circular arc edge.

Still further, a front side of the first inboard front fillet is tangent to a front side of the inboard front; the rear side of the first inner rear fillet is tangent to the rear side of the inner rear part; the front side of the first outer front fillet is tangent to the front side of the outer front part; the rear side of the first outside rear fillet is tangent to the rear side of the outside rear portion.

Still further, the talar prosthesis body also has a notch on a bottom surface thereof, the notch extending through to the medial and lateral sides of the talar prosthesis body.

Still further, the cross section of the notch is a trapezoidal section; the notch is provided with a front inclined surface and a rear inclined surface which are opposite, the front inclined surface is positioned on the front side of the rear inclined surface, an upper bottom surface is connected between the front inclined surface and the rear inclined surface, and the upper bottom surface is parallel to the supporting plane.

Furthermore, an inner anchoring part and an outer anchoring part are arranged on the talar prosthesis body, the inner anchoring part and the outer anchoring part are both arranged on the front inclined plane, the inner anchoring part is positioned on the inner front part, and the outer anchoring part is positioned on the outer front part.

Preferably, the tibial component comprises: the tibia prosthesis and the tibia connecting part are connected with the tibia prosthesis; the tibia prosthesis is a plate body and is provided with a plate body top surface, a plate body bottom surface and a plate body circumferential side surface located between the plate body top surface and the plate body bottom surface, the plate body top surface is connected with the tibia connecting portion, the plate body top surface and the plate body bottom surface are parallel to each other and have the same shape, and the plate body circumferential side surface is formed along the outline of the plate body top surface; the circumferential side surface of the plate body comprises a front side arc-shaped surface, a concave arc-shaped surface, a rear side arc-shaped surface and a vertical side surface which are sequentially connected, the front side arc-shaped surface is opposite to the rear side arc-shaped surface, and the concave arc-shaped surface is opposite to the vertical side surface; the front side arc-shaped surface and the rear side arc-shaped surface are outwards convex, the concave arc-shaped surface is inwards concave, and the vertical side surface is a plane vertical to the bottom surface of the plate body; the top surface of the filler block is connected with the bottom surface of the plate body.

Furthermore, the front side arc-shaped surface is connected with the concave arc-shaped surface through the front concave side arc-shaped surface, and the front side arc-shaped surface and the concave arc-shaped surface are both tangent to the front concave side arc-shaped surface; the rear side arc-shaped surface is connected with the concave arc-shaped surface through a rear concave side arc-shaped surface, and the rear side arc-shaped surface and the concave arc-shaped surface are both tangent to the rear concave side arc-shaped surface; the vertical side face and the rear side arc-shaped face are connected through a rear vertical side arc-shaped face, and the vertical side face and the rear side arc-shaped face are tangent to the rear vertical side arc-shaped face; the front side arc-shaped surface is connected with the vertical side surface through a front vertical side arc-shaped surface, and the front side arc-shaped surface and the vertical side surface are tangent to the front vertical side arc-shaped surface; along the direction parallel to the vertical side face, the tangent position of the front side arc-shaped face and the front vertical side arc-shaped face is positioned in front of the tangent position of the front side arc-shaped face and the front concave side arc-shaped face, and the tangent position of the rear side arc-shaped face and the rear vertical side arc-shaped face is positioned in front of the tangent position of the rear side arc-shaped face and the rear concave side arc-shaped face; along with vertical side perpendicular direction, the tangent department of rear side arcwall face with the rear recess side arcwall face is compared in the tangent department of front side arcwall face with the front recess side arcwall face, the tangent department of rear side arcwall face with the rear recess side arcwall face is closer to vertical side.

Furthermore, along with vertical side perpendicular direction, sunken arcwall face with the tangent department of back sunken side arcwall face compare in preceding sunken side arcwall face with the tangent department of sunken arcwall face, sunken arcwall face with the tangent department of back sunken side arcwall face is closer to vertical side.

Furthermore, the tibia connecting part is a plurality of columnar bodies, all the columnar bodies are obliquely arranged relative to the top surface of the plate body, and the oblique directions of all the columnar bodies are the same.

Furthermore, a convex strip is arranged on the bottom surface of the plate body; the top surface of the lining block of the inner lining block is a plane, and a clamping groove for clamping the convex strips is formed in the top surface of the lining block of the inner lining block.

As described above, the talus implant and artificial ankle prosthesis assembly of the present invention have the following advantageous effects:

1) the talus prosthesis body of the talus implant disclosed by the invention conforms to the anatomical characteristics of the talus dome of the ankle joint of Asian, and the height of the highest tangent point at the inner side of the talus prosthesis body is greater than that of the highest tangent point at the outer side, so that the talus implant conforms to the anatomical characteristics of asymmetry of the highest point of the dome at the inner side and the outer side of the talus; the radius of the inner side rear top arc surface is larger than that of the inner side front top arc surface; the radius of the inner side rear top arc surface is larger than that of the outer side front top arc surface; the radius of the inner side rear top arc surface is larger than that of the outer side rear top arc surface, and the structure is more in line with the anatomical characteristics of the ankle joint talus vault surface of Asian;

2) the inner side front top arc surface is tangent with the inner side rear top arc surface, and the outer side front top arc surface is tangent with the outer side rear top arc surface; the tangential position transition structure is adopted among all the arc surfaces, so that the influence of the change of curvature on joint motion is avoided;

3) the curvature radius of the inner arc-shaped concave part is equal to the radius of the inner rear top arc surface, and the curvature radius of the outer arc-shaped concave part is equal to the radius of the outer rear top arc surface; the intersection of the outer side wall of the inner arc-shaped concave part and the inner side wall of the outer arc-shaped concave part forms a bottom convex edge; the bottom convex edge of the inner filler block is inserted into the concave slot of the top of the talus and can move along the concave slot of the top of the talus; the structure enables the inner lining block to simulate the motion process of the ankle joint in the relative movement process of the top of the talar prosthesis body;

4) the artificial ankle joint prosthesis component provided by the invention is in line with the ankle anatomy characteristics of the ankle joint of Asian, and can avoid the ankle joint kinematic abnormality caused after ankle joint replacement surgery.

Drawings

Fig. 1 is a perspective view of the artificial ankle prosthesis assembly for installation at the ankle of a right foot according to the present embodiment.

Fig. 2 is a schematic structural view showing the outer side of the artificial ankle prosthesis assembly for installation at the right ankle of the present embodiment.

Fig. 3 is a schematic structural view showing the inner side of the artificial ankle prosthesis assembly for installation at the right ankle of the present embodiment.

FIG. 4 is a medial perspective view of a talar implant for a right ankle mounted prosthetic assembly according to the present embodiment.

FIG. 5 is a perspective view of the lateral side of a talar implant for a right ankle mounted prosthetic assembly according to the present embodiment.

Figure 6 illustrates a front view of a talar implant as the prosthetic ankle prosthesis assembly of the present embodiment.

Figure 7 illustrates a posterior view of a talar implant that is a prosthetic ankle prosthesis assembly of the present embodiment.

Figure 8 shows a left side view of a talar implant as the prosthetic ankle prosthesis assembly of the present embodiment.

Figure 9 illustrates a right side view of a talar implant as the prosthetic ankle prosthesis assembly of the present embodiment.

Figure 10 illustrates a top view of a talar implant that is a prosthetic ankle prosthesis assembly of the present embodiment.

Figure 11 illustrates a bottom view of a talar implant that is a prosthetic ankle prosthesis assembly of the present embodiment.

Fig. 12 is a bottom view schematically showing the construction of an inner pad of the artificial ankle prosthesis assembly according to the present embodiment.

Fig. 13 is a top view showing the construction of an inner pad of the prosthetic ankle component according to the present embodiment.

Fig. 14 is a schematic structural view showing a side of a tibial prosthesis provided with a concave arc-shaped surface of the artificial ankle joint prosthesis assembly according to the present embodiment.

Fig. 15 is a structural view showing that no convex strip or reinforcing strip is arranged on the bottom surface of the plate body of the tibial prosthesis of the artificial ankle joint prosthesis assembly according to the embodiment.

Fig. 16 is a schematic structural view showing the top surface of the plate body of the tibial prosthesis of the artificial ankle prosthesis assembly according to the present embodiment.

Fig. 17 is a schematic structural view showing that the artificial ankle joint prosthesis assembly is installed at the right ankle joint when no convex strip or reinforcing strip is arranged on the bottom surface of the plate body of the tibial prosthesis of the artificial ankle joint prosthesis assembly of the present embodiment and no clamping groove is arranged on the lining block.

Description of the reference numerals

10 calcaneus

20 tibia bone

30 fibula

100 talus prosthesis body

101 support plane

102 notch

1021 front bevel

1022 rear inclined plane

1023 upper and lower surfaces

110 inner front part

111 inner front top arc surface

112 inner side surface of the inner front portion

113 front side of the inner front part

114 first inside front fillet

120 medial posterior portion

121 inner side rear top arc surface

122 medial surface of medial posterior portion

123 rear side of the medial posterior portion

124 first inside rear fillet

130 lateral anterior portion

131 outer front top arc surface

132 lateral surface of the lateral anterior portion

133 front side of the outer front part

134 first outside front fillet

140 lateral posterior portion

141 outside rear top arc surface

142 lateral surface of lateral posterior portion

143 lateral posterior lateral edge

144 first outside rear fillet

150 front side sunken seam

160 back side concave seam

210 internal anchor

220 external anchor

L1 slant line of outer front part

L2 oblique connecting line of outer rear part

i tangent point of front side of first outside front fillet tangent to front side of outside front

d tangent point of rear side of the first outside rear fillet tangent to rear side of the outside rear part

a highest point at the tangent position of the outer side front top circular arc surface and the outer side rear top circular arc surface

3100 tibial prosthesis

3110 the top surface of the plate body

3120 bottom surface of plate body

3121 Rib

3122 inner slope

3123 reinforcing strip

3130 peripheral side surface of plate body

3131 front arc surface

3132 front concave side arc surface

3133 concave arc surface

3134 rear concave side arc surface

3135 rear arc surface

3136 rear vertical side arc

3137 vertical side

3138 front vertical side arc

3141 the tangent of the front arc surface and the front vertical arc surface

3142 the tangent of the front arc surface and the front concave arc surface

3143 the rear arc surface is tangent to the rear vertical arc surface

3144 the rear arc surface is tangent to the rear concave arc surface

3145 the tangent position of the front concave side arc surface and the concave arc surface

3146 the tangent position of the concave arc surface and the back concave side arc surface

3200 tibial junction

3210 column-shaped body

400 inside lining block

401 front side of inner pad

402 back side of inner pad

403 inner side surface of inner pad

404 outer side of inner pad

410 top surface of filler block

420 bottom surface of pad

421 inner arc depressed part

422 outer arc depressed part

423 bottom projecting edge

430 card slot

431 inner inclined wall surface

441 front bevel

442 rear slope

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to the attached drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1 to 17, the artificial ankle prosthesis assembly of the present embodiment for installation on the right ankle comprises: a talar implant, a tibial component, and a lining block 400;

a talar implant for mounting on the calcaneus bone 10, the medial side of the talar implant being closer to the tibia 20 than the lateral side of the talar implant, the anterior side of the talar implant being closer to the toes than the posterior side of the talar implant;

the talar implant comprises: a talar prosthesis body 100, the talar prosthesis body 100 having a support plane 101 on a bottom surface thereof;

talar prosthesis body 100 includes connected medial and lateral portions; the medial portion comprises a connected medial anterior portion 110 and a medial posterior portion 120, and the lateral portion comprises a connected lateral anterior portion 130 and a lateral posterior portion 140;

the top surface of the inner front part 110 is an inner front top arc surface 111, and the top surface of the inner rear part 120 is an inner rear top arc surface 121; the inner front top arc surface 111 is tangent to the inner rear top arc surface 121; the inner front top arc surface 111 and the inner rear top arc surface 121 are both recessed downward along the inward-outward direction;

the top surface of the outer front part 130 is an outer front top arc surface 131, and the top surface of the outer rear part 140 is an outer rear top arc surface 141; the outer front top arc surface 131 is tangent to the outer rear top arc surface 141; the outer front top arc 131 and the outer rear top arc 141 are both concave downward in the outward-inward direction;

the lateral side of the medial anterior portion 110 is connected to and coplanar with the medial side of the lateral anterior portion 130, and the lateral side of the medial posterior portion 120 is connected to and coplanar with the medial side of the lateral posterior portion 140; the top of the junction of the medial anterior portion 110 and the lateral anterior portion 130 forms a anterior concave seam 150 and the top of the junction of the medial posterior portion 120 and the lateral posterior portion 140 forms a posterior concave seam 160; the anterior concave slot 150 connects with the posterior concave slot 160 to form a talus top concave slot;

the distance between the highest point of the tangent position of the inner front top arc surface 111 and the inner rear top arc surface 121 and the supporting plane 101 is the height of the inner highest tangent point; the distance between the highest point of the tangent of the outer front top arc surface 131 and the outer rear top arc surface 141 and the supporting plane 101 is the height of the highest tangent point of the outer side; the height of the highest tangent point at the inner side is greater than that at the highest tangent point at the outer side;

the radius of the inside rear top arc surface 121 is greater than the radius of the inside front top arc surface 111; the radius of the inner rear top arc surface 121 is greater than the radius of the outer front top arc surface 131; the radius of the inside rear top arc surface 121 is greater than the radius of the outside rear top arc surface 141;

inner pad 400 has oppositely disposed pad top surface 410 and pad bottom surface 420;

the bottom surface 420 of the inner pad 400 is in contact with the top of the talar prosthesis body 100, and an inner arc-shaped recess 421 and an outer arc-shaped recess 422 are provided on the bottom surface 420 of the inner pad 400 in the inward and outward directions of the inner pad 400; the radius of curvature of the inner arc-shaped recess 421 is equal to the radius of the inner rear top arc-shaped surface 121, and the radius of curvature of the outer arc-shaped recess 422 is equal to the radius of the outer rear top arc-shaped surface 141; a bottom convex edge 423 is formed at the intersection of the outer side wall of the inner arc-shaped concave part 421 and the inner side wall of the outer arc-shaped concave part 422; the bottom convex edge 423 of the inner pad 400 is inserted into and movable along the talus top notch;

the top surface 410 of the pad is coupled to a tibial component for mounting to the bottom of the tibia 20.

The talus prosthesis body 100 of the talus implant disclosed by the invention meets the anatomical characteristics of the talus dome of the ankle joint of Asian, and the height of the highest tangent point at the inner side of the talus prosthesis body 100 is greater than that of the highest tangent point at the outer side, so that the talus implant conforms to the anatomical characteristics of asymmetry of the highest point of the dome at the inner side and the outer side of the talus; since the radius of the inside rear top arc 121 is larger than that of the inside front top arc 111; the radius of the inner rear top arc surface 121 is greater than the radius of the outer front top arc surface 131; the radius of the inner rear top arc surface 121 is larger than that of the outer rear top arc surface 141, so that the structure is more suitable for the anatomical characteristics of the ankle joint talus dome of Asian people;

the inner front top arc surface 111 is tangent to the inner rear top arc surface 121, and the outer front top arc surface 131 is tangent to the outer rear top arc surface 141; the tangential position transition structure is adopted among all the arc surfaces, so that the influence of the change of curvature on joint motion is avoided;

the radii of the inner front top arc surface 111, the outer front top arc surface 131 and the outer rear top arc surface 141 are adjusted, so that the multi-radius asymmetric structural requirement of the ankle joint kinematics can be met;

since the radius of curvature of the inner arc-shaped recess 421 is equal to the radius of the inner rear top arc 121, the radius of curvature of the outer arc-shaped recess 422 is equal to the radius of the outer rear top arc 141; a bottom convex edge 423 is formed at the intersection of the outer side wall of the inner arc-shaped concave part 421 and the inner side wall of the outer arc-shaped concave part 422; the bottom convex edge 423 of the inner pad 400 is inserted into and movable along the talus top notch; this configuration enables the inner pad 400 to simulate the motion of the ankle joint during relative movement of the top of the talar prosthesis body;

the talus implant disclosed by the invention meets the talus anatomy characteristics of the ankle joint of Asian, can avoid the kinematic abnormality of the ankle joint after ankle joint replacement surgery, and can avoid the talus implant sinking or the talus implant colliding with the surrounding tissues.

The front side 401 of the inner pad block 400 and the rear side 402 of the inner pad block 400 are both arc surfaces, and the structure ensures that soft tissues such as tendons or ligaments around the ankle joint are not easily damaged in the relative movement process of the inner pad block 400 at the top of the talar prosthesis body; the inner side 403 of the inner liner block 400 and the outer side 404 of the inner liner block 400 are planar and parallel to each other, which facilitates manufacturing. The front side 401 of the inner pad 400, the inner side 403 of the inner pad 400, the rear side 402 of the inner pad 400 and the outer side 404 of the inner pad 400 are connected in sequence.

The maximum distance between the front side 401 of the inner lining block 400 and the rear side 402 of the inner lining block 400 is 32-37 mm; the distance between the inner side 403 of the inner backing block 400 and the outer side 404 of the inner backing block 400 is 22-27 mm. The structure conforms to the structure and dimensions of the ankle joint of asian people.

The top land surface 410 of the inner pad 400 is planar, and the bottom land surface 420 of the inner pad 400 is parallel to the top land surface 410 of the inner pad 400; the front side of the inner pad 400 has a front bevel 441 and the rear side of the inner pad 400 has a rear bevel 442; the front inclined surface 441 is arranged to be inclined upward, the upper portion of the front inclined surface 441 is connected to the front side surface 401 of the inner pad 400, and the lower portion of the front inclined surface 441 is connected to the pad bottom surface 420 of the inner pad 400; the rear chamfer 442 is inclined such that an upper portion of the rear chamfer 442 is connected to the rear side 402 of the inner pad 400 and a lower portion of the rear chamfer 442 is connected to the bottom surface 420 of the inner pad 400.

The top pad surface 410 of the inner pad 400 is a plane, and the bottom pad surface 420 of the inner pad 400 is parallel to the top pad surface 410 of the inner pad 400, which is convenient for machining; the planar top pad surface 410 of the inner pad 400 also facilitates the connection of the top pad surface 410 of the inner pad 400 with the bottom plate surface 3120 of tibial prosthesis 3100.

The front side of the inner pad 400 has a front bevel 441 and the rear side of the inner pad 400 has a rear bevel 442; the front inclined surface 441 is arranged to be inclined upward, the upper portion of the front inclined surface 441 is connected to the front side surface 401 of the inner pad 400, and the lower portion of the front inclined surface 441 is connected to the pad bottom surface 420 of the inner pad 400; the rear chamfer 442 is inclined such that an upper portion of the rear chamfer 442 is connected to the rear side 402 of the inner pad 400 and a lower portion of the rear chamfer 442 is connected to the bottom surface 420 of the inner pad 400. This configuration prevents dislocation of the inner pad 400 with respect to the talar prosthesis body.

In this embodiment, the angle of the front chamfer 441 relative to the bottom surface 420 of the pad is greater than or equal to the angle of the rear chamfer 442 relative to the bottom surface 420 of the pad; the angle of the front chamfer 441 relative to the bottom surface 420 of the pad and the angle of the rear chamfer 442 relative to the bottom surface 420 of the pad both range from 30 to 60.

The following table is a table of specific values for each parameter in the production of the three inner pads 400:

in the talar implant of this embodiment, the radius of the lateral anterior tip arc surface 131 is equal to or less than the radius of the lateral posterior tip arc surface 141, and the radius of the medial anterior tip arc surface 111 is equal to or less than the radius of the lateral anterior tip arc surface 131. The radius of the inside rear top arc surface 121 is greater than the radius of the inside front top arc surface 111; the radius of the inner rear top arc surface 121 is greater than the radius of the outer front top arc surface 131; the radius of the inside rear top arc surface 121 is greater than the radius of the outside rear top arc surface 141; can meet the movement mode of presenting multiple centers and radii in the ankle acupuncture point provided by the talus during the movement of the ankle joint. According to the method, the inclination of the normal tibialis distance joint movable shaft from the outer lower part to the inner upper part in the dorsiflexion process of the normal ankle joint can be simulated; conversely, during plantarflexion, the normal tibialis joint axis of motion is inclined from medial-inferior-lateral-superior.

The radius of the inner front top arc surface 111 ranges from 12 mm to 22mm, and the radius of the inner rear top arc surface 121 ranges from 17mm to 27 mm; the radius of the outer front top arc 131 and the radius of the outer rear top arc 141 both range from 15 to 25 mm. This configuration allows the configuration of the top surface formed by the talar implant to better conform to the anatomical features of the talar dome of the asian ankle joint.

Any plane parallel to the medial-lateral direction of the talar prosthesis body 100 and perpendicular to the support plane 101 is a front vertical plane; the intersection line of any one front vertical surface and the outer side surface of the inner front part 110 is a front intersection line; in the medial-lateral direction of the talar prosthesis body 100, the distance between the anterior intersection line and the medial side 112 of the medial anterior portion 110 is the width of the medial anterior portion 110, and the distance between the anterior intersection line and the lateral side 132 of the lateral anterior portion 130 is the width of the lateral anterior portion 130;

the width of the medial anterior portion 110 and the width of the lateral anterior portion 130 both decrease sequentially along the anterior-posterior direction of the talar prosthesis body 100, the width of the medial anterior portion 110 being greater than the width of the lateral anterior portion 130 in the same anterior vertical plane;

any plane parallel to the medial-lateral direction of the talar prosthesis body 100 and perpendicular to the support plane 101 is a posterior vertical plane; the intersection line of any one rear vertical surface and the outer side surface of the inner rear part 120 is a rear intersection line; the distance between the posterior intersection line and the medial side 122 of the medial posterior portion 120 is the width of the medial posterior portion 120, and the distance between the posterior intersection line and the lateral side 142 of the lateral posterior portion 140 is the width of the lateral posterior portion 140, in the medial-lateral direction of the talar prosthesis body 100;

the width of the medial posterior portion 120 and the width of the lateral posterior portion 140 decrease in order along the anterior-posterior direction of the talar prosthesis body 100, with the width of the medial posterior portion 120 being greater than the width of the lateral posterior portion 140 in the same posterior vertical plane.

The width of the medial anterior portion 110 and the width of the lateral anterior portion 130 both decrease sequentially along the anterior-posterior direction of the talar prosthesis body 100, the width of the medial anterior portion 110 being greater than the width of the lateral anterior portion 130 in the same anterior vertical plane; the width of the medial posterior portion 120 and the width of the lateral posterior portion 140 both decrease in order along the anterior-posterior direction of the talar prosthesis body 100, and the width of the medial posterior portion 120 is greater than the width of the lateral posterior portion 140 in the same posterior vertical plane, which allows the width-wise configuration of the talar prosthesis body 100 to conform to the width-wise configuration of the asian ankle talus.

The inner side 112 of the medial anterior portion 110 is coplanar with the inner side 122 of the medial posterior portion 120, the outer side 132 of the lateral anterior portion 130 is coplanar with the outer side 142 of the lateral posterior portion 140, and the outer sides of the medial posterior portion 120 and the outer side 142 of the lateral posterior portion 140 are both perpendicular to the support plane 101; the inner side 122 of the medial posterior portion 120 and the outer side 142 of the lateral posterior portion 140 extend posteriorly of the talar prosthesis body 100 at an angle a of 9-13. The structure conforms to the structural characteristics and the narrowing amplitude of the Asian ankle joint talus narrowing from the anterior side to the posterior side.

The front side 113 of the inner front portion 110 is a rearwardly concave circular arc; the rear side 123 of the inner rear portion 120 is a forwardly concave circular arc; the front side 133 of the outer front portion 130 is a rearwardly concave circular arc; the rear side 143 of the lateral rear portion 140 is a forward concave circular arc. This structure accords with the profile structure of asian people's ankle joint talus's front side and rear side, can avoid the talus implant to install on calcaneus 10 after, the soft tissues such as the tendon or the ligament around the ankle joint damage.

The radius of the front side 113 of the inner front portion 110 ranges from 35 to 40 mm; the radius of the rear side 123 of the medial rear portion 120 ranges from 34-39 mm; the radius of the front side 133 of the outer front portion 130 ranges from 12 to 17 mm; the radius of the rear side 143 of the lateral rear portion 140 ranges from 40 to 45 mm. This structure makes the structure of talus implant more compact, more accords with the profile structure of asian ankle joint talus anterior and posterior side.

A first inner front fillet part 114 is arranged at the intersection of the inner front top arc surface 111 and the inner side surface 112 of the inner front part 110; the front side of the first inner front fillet 114 is a circular arc;

a first inner rear fillet part 124 is arranged at the intersection of the inner rear top arc surface 121 and the inner side surface 122 of the inner rear part 120; the rear side of the first inner rear fillet 124 is a circular arc;

a first outer front fillet part 134 is arranged at the intersection of the outer front top arc surface 131 and the outer side surface 132 of the outer front part 130; the front side of the first outside front fillet 134 is a circular arc;

a first outer rear fillet part 144 is arranged at the intersection of the outer rear top arc surface 141 and the outer side surface 142 of the outer rear part 140; the rear side of the first outside rear fillet portion 144 is a circular arc.

The first medial anterior fillet 114, the first medial posterior fillet 124, the first lateral anterior fillet 134 and the first lateral posterior fillet 144 are arranged to enable the talar implant to have a smoother contour, thereby preventing the talar implant from damaging soft tissues such as tendons or ligaments around the ankle joint after being mounted on the calcaneus 10.

The radius of the front side of the first inside front fillet 114 ranges from 1 to 5 mm; the radius of the rear side of the first inside rear fillet 124 ranges from 1 to 5 mm; the radius of the front side of the first outside front fillet 134 ranges from 3 to 7 mm; the radius of the rear side of the first outside rear fillet 144 ranges from 2 to 6 mm. This structure makes the structure of talus implant compacter, more accords with the profile structure of Asian ankle joint talus.

The front side of the first inner front rounded corner 114 is tangent to the front side 113 of the inner front portion 110; the rear side of the first medial rear fillet 124 is tangent to the rear side 123 of the medial rear 120; the front side of the first outboard front fillet 134 is tangent to the front side 133 of the outboard front 130; the rear side of the first outboard rear fillet 144 is tangent to the rear side 143 of the outboard rear portion 140. This configuration allows for a more rounded contour of the talar implant.

The talar prosthesis body 100 also has notches 102 in its bottom surface, the notches 102 extending through to the medial and lateral sides of the talar prosthesis body 100. The provision of the recess 102 facilitates the mounting of the talar prosthesis body 100 on the talus. Notch 102 link up to the inboard and the outside of talus prosthesis body 100 for the both sides of talus prosthesis body 100 are open design and do not have the sheltering from, and this design characteristics have guaranteed that the condition of talus prosthesis body 100 and bone host interface can be seen clearly to the X line side photograph piece after ankle joint talus prosthesis body 100 installs, have avoided talus prosthesis body 100 not hard up unable condition through the early discovery of image examination.

The cross section of the notch 102 is a trapezoidal section; the recess 102 has opposite front and rear ramps 1021, 1022, the front ramp 1021 being forward of the rear ramp 1022, an upper bottom surface 1023 between the front and rear ramps 1021, 1022, the upper bottom surface 1023 being parallel to the support plane 101. The three-sided configuration of the anterior slope 1021, superior bottom surface 1023, and posterior slope 1022 reduces the amount of bone resection by the talar prosthesis body 100 when installed, allowing the talar bone to retain more of the hard subchondral bone, reducing the likelihood of the talar prosthesis body 100 sinking.

In order to make the contour of the talar prosthesis body 100 more conform to the contour structure of the ankle joint talus of asian, a connecting line between a tangent point i of the anterior side of the first lateral anterior rounded corner 134 and the anterior side 133 of the lateral anterior portion 130 and a highest point a at which the lateral anterior top rounded surface 131 and the lateral posterior top rounded surface 141 are tangent is an external anterior oblique connecting line L1, on a plane passing through the external anterior oblique connecting line L1 and perpendicular to the support plane 101, a perpendicular line perpendicular to the external anterior oblique connecting line L1 and intersecting a midpoint of the external anterior oblique connecting line L1 is an external anterior oblique perpendicular line, an intersection point of the external anterior oblique perpendicular line and the lateral anterior top rounded surface 131 is an external anterior top middle position point, and the distance between the external anterior top middle position point and the anterior oblique surface 1021 is 3-8 mm;

a connecting line connecting a tangent point d of the rear side edge of the first outer rear fillet portion 144 tangent to the rear side edge 143 of the outer rear portion 140 and a highest point a at which the outer front top arc surface 131 is tangent to the outer rear top arc surface 141 is an outer rear oblique connecting line L2; on a plane passing through the outer rear oblique line L2 and perpendicular to the support plane 101, a perpendicular line perpendicular to the outer rear oblique line L2 and intersecting with a midpoint of the outer rear oblique line L2 is an outer rear oblique perpendicular line, an intersection point of the outer rear oblique perpendicular line and the outer rear ceiling arc surface 141 is an outer rear ceiling middle position point, and a distance between the outer rear ceiling middle position point and the rear inclined surface 1022 is 3 to 8 mm.

The distance between the upper bottom surface 1023 and the support plane 101 is 3-10 mm. The distance between the top point a at the tangent position of the outer side front top arc surface 131 and the outer side rear top arc surface 141 and the upper bottom surface 1023 is 3-8 mm; the distance between the highest point of the tangent of the inside front top arc surface 111 and the inside rear top arc surface 121 and the upper bottom surface 1023 is 3.5-10.5 mm.

An inner anchor 210 and an outer anchor 220 are provided on the talar prosthesis body 100, the inner anchor 210 and the outer anchor 220 being mounted on the anterior ramp 1021, the inner anchor 210 being on the medial anterior portion 110 and the outer anchor 220 being on the lateral anterior portion 130. Inner anchor 210 and outer anchor 220 are identical in structure, inner anchor 210 including a cylindrical portion 211 connected to talar prosthesis body 100 and a hemispherical portion 212 connected to the bottom of cylindrical portion 211; the length of the columnar part 211 is 2-8mm, and the length of the hemispherical part 212 is 2-4 mm. Internal anchoring member 210 and external anchoring member 220 insert talus neck back from the top of the front to the below back, increase talus prosthesis body 100 initial stability after installation, and the design of this mounted position can reduce the influence to the talus blood supply, reduces talus prosthesis body 100 installation back talus osteonecrosis's emergence.

In order to enable the outline of the talar prosthesis body 100 to better conform to the outline structure of the talar bone of the ankle joint of an asian person, a connecting line formed by connecting the highest point at the tangent position of the inner front top circular arc surface 111 and the inner rear top circular arc surface 121 with the highest point a at the tangent position of the outer front top circular arc surface 131 and the outer rear top circular arc surface 141 is a top connecting line, a plane which is perpendicular to the supporting plane 101 and passes through the top connecting line is a top vertical plane, on the top vertical plane, the intersection point of a straight line which passes through the midpoint of the top connecting line and is perpendicular to the supporting plane 101 and the top surface of the talar prosthesis body 100 is a middle connecting point, and the middle connecting point is located at the intersection position of the inner front top circular arc surface 111, the inner rear top circular arc surface.

The distance between the middle connecting point and the middle point of the top vertical surface through the top connecting line is 0.5-3.5 mm.

The highest point a at the tangent of the inner front top arc surface 111 and the inner rear top arc surface 121 is higher than the highest point a at the tangent of the outer front top arc surface 131 and the outer rear top arc surface 141 by 0.5-2.5 mm.

The following table shows the specific values of the various parameters in the three talar implant products:

the shin bone subassembly of this embodiment installs on the ankle of right foot, and the shin bone subassembly includes: a tibial prosthesis 3100 and a tibial connection portion 3200 connected to the tibial prosthesis 3100;

the tibial prosthesis 3100 is a plate body, the tibial prosthesis 3100 has a plate body top surface 3110, a plate body bottom surface 3120, and a plate body circumferential side surface 3130 between the plate body top surface 3110 and the plate body bottom surface 3120, the plate body top surface 3110 is connected to the tibial connection portion 3200, the plate body top surface 3110 and the plate body bottom surface 3120 are parallel to each other and have the same shape, and the plate body circumferential side surface 3130 is formed along the contour of the plate body top surface 3110;

the circumferential side surface 3130 of the plate body includes a front arc-shaped surface 3131, a concave arc-shaped surface 3133, a rear arc-shaped surface 3135 and a vertical side surface 3137 which are sequentially connected, the front arc-shaped surface 3131 is opposite to the rear arc-shaped surface 3135, and the concave arc-shaped surface 3133 is opposite to the vertical side surface 3137;

front and rear arcuate surfaces 3131, 3135 are outwardly convex, concave arcuate surface 3133 is inwardly concave, vertical side 3137 is a plane perpendicular to the bottom surface 3120 of the plate body, and pad top surface 410 is connected to the bottom surface 3120 of the plate body. The plate body bottom surface 3120 is adapted to fit to the bottom of the tibia 20.

The bottom surface 3120 of the plate body is provided with a convex strip 3121; the top surface 410 of the inner pad 400 is a flat surface, and the top surface 410 of the inner pad 400 is provided with a slot 430 into which the protruding strip 3121 is inserted.

In this embodiment, the number of the protruding strips 3121 is two, two protruding strips 3121 are disposed opposite to each other, the side of each protruding strip 3121 opposite to the other protruding strip 3121 is an inner inclined surface 3122, and the two protruding strips 3121 are connected by a reinforcing strip 3123. The number of the locking grooves 430 on the inner pad 400 is two, and the two locking grooves 430 are oppositely disposed on opposite edges of the top pad surface 410 of the inner pad 400. Each catching groove 430 has an inner inclined wall surface 431 corresponding to the inner inclined surface 3122 of the protruding strip 3121. When the protruding strips 3121 are inserted into the corresponding slots 430, the pad top surface 410 contacts the board body bottom surface 3120.

The horizontal resection of the bottom of the tibia 20 is to remove the desired thickness from the bottom of the tibia 20, but the bone on the side of the bottom of the tibia 20 away from the fibula 30 has a remaining portion, the side of the remaining portion adjacent to the fibula 30 is a flat surface, and the bottom of the tibia 20 after the horizontal resection is also a flat surface; a vertical side surface 3137 of the plate body circumferential side surface 3130 corresponds to a side surface of the remaining portion close to the fibula 30, a front arc-shaped surface 3131 of the plate body circumferential side surface 3130 corresponds to a front profile of a bottom surface of the tibia 20 after horizontal osteotomy, a rear arc-shaped surface 3135 of the plate body circumferential side surface 3130 corresponds to a rear profile of a bottom surface of the tibia 20 after horizontal osteotomy, and a concave arc-shaped surface 3133 of the plate body circumferential side surface 3130 corresponds to a position of the fibula 30, so that the structure of the plate body circumferential side surface 3130 can be matched with a profile shape of the bottom surface of the tibia 20 after horizontal osteotomy; since the concave arc surface 3133 of the circumferential side surface 3130 of the plate body is concave inward, the structure corresponds to the convex structure of the fibula 30, which can reduce the impact of the prosthesis on the fibula 30 after the operation.

The front arched face 3131 and the concave arched face 3133 are connected by a front concave arched face 3132, and both the front arched face 3131 and the concave arched face 3133 are tangent to the front concave arched face 3132;

the rear arched face 3135 is connected to the concave arched face 3133 by a rear concave arched face 3134, and both the rear arched face 3135 and the concave arched face 3133 are tangent to the rear concave arched face 3134;

the vertical side 3137 is connected to the rear arcuate surface 3135 by a rear vertical arcuate surface 3136, and both the vertical side 3137 and the rear arcuate surface 3135 are tangent to the rear vertical arcuate surface 3136;

the front side cambered surface 3131 is connected with the vertical side surface 3137 through a front vertical side cambered surface 3138, and both the front side cambered surface 3131 and the vertical side surface 3137 are tangent to the front vertical side cambered surface 3138;

in a direction parallel to vertical side 3137, the tangent 3141 of front lateral arcuate surface 3131 to front vertical lateral arcuate surface 3138 is in front of the tangent 3142 of front lateral arcuate surface 3131 to front concave lateral arcuate surface 3132, and the tangent 3143 of rear lateral arcuate surface 3135 to rear vertical lateral arcuate surface 3136 is in front of the tangent 3144 of rear lateral arcuate surface 3135 to rear concave lateral arcuate surface 3134;

along a direction perpendicular to vertical side 3137, the tangent 3144 of rear arcuate surface 3135 to rear concave arcuate surface 3134 is closer to vertical side 3137 than the tangent 3142 of front arcuate surface 3131 to front concave arcuate surface 3132, and the tangent 3144 of rear arcuate surface 3135 to rear concave arcuate surface 3134 is to vertical side 3137.

This configuration allows plate circumferential side 3130 to be defined by anterior arcuate surface 3131, anterior concave arcuate surface 3132, concave arcuate surface 3133, posterior concave arcuate surface 3134, posterior arcuate surface 3135, posterior vertical arcuate surface 3136, vertical side 3137 and anterior vertical arcuate surface 3138, which allows the configuration of plate circumferential side 3130 to match the profile of the bottom of the tibia 20 undergoing horizontal osteotomy, while plate circumferential side 3130 of the tibial assembly is configured to cover the profile of the bottom of the tibia 20 undergoing horizontal osteotomy to the maximum, i.e., plate circumferential side 3130 of the tibial assembly is configured to cover the harder outer region of the bone of tibia 20, which allows the incidence of post-operative prosthetic subsidence to be reduced.

Along a direction perpendicular to vertical side 3137, the tangent 3146 of concave arcuate surface 3133 to concave side surface 3134 is closer to vertical side surface 3137 than the tangent 3145 of front concave arcuate surface 3132 to concave arcuate surface 3133, the tangent 3146 of concave arcuate surface 3133 to concave side surface 3134, and the tangent 3146 of concave arcuate surface 3133 to concave side surface 3134. The structure can enable the structure of the plate body circumferential side surface 3130 of the tibial component at the concave arc-shaped surface 3133 to better conform to the structure of the corresponding fibula 30, so that the impact of the prosthesis and the fibula 30 after operation is effectively reduced.

The maximum distance between the front and rear arcuate surfaces 3131, 3135 is in the range of 33-45 mm; the maximum distance between the vertical side 3137 and the front concave side arc 3132 is in the range of 30-42 mm. This range of values corresponds to the anatomy of the bottom surface of the asian tibia 20 after horizontal osteotomy.

The distance between the plate body top surface 3110 and the plate body bottom surface 3120 is 3-6mm, the distance between the plate body top surface 3110 and the plate body bottom surface 3120 is the thickness of the tibial prosthesis 3100, and the range of the thickness of the tibial prosthesis 3100 can meet the requirements of the ankle joint replacement surgery.

The radius of the front concave side arc 3132 ranges: 1.5-5.5 mm; the radius of the concave arc surface 3133 ranges from: 13.5-19.5 mm; the radius of the rear concave side arc 3134 ranges: 2.5-8.5 mm; the radius of the rear arc 3135 ranges: 42-50 mm; the radius of the rear vertical side arc 3136 ranges: 2.5-6.5 mm; the radius of the front vertical side arc 3138 ranges: 2.5-6.5 mm; the radius of the front arc 3131 ranges: 52.5-60.5 mm; the length of the vertical side 3137 in the horizontal direction is 16-30 mm. This range of values allows the configuration of the plate peripheral side 3130 of the tibial component to cover the anatomy of the harder outer region of the bone of the asian tibia 20.

The following table is a table of specific values for each parameter in the product of tibial prosthesis 3100 for three tibial components:

the tibial connecting portion 3200 is a plurality of column bodies 3210, all the column bodies 3210 are disposed obliquely to the plate body top surface 3110, and the oblique directions of all the column bodies 3210 are the same. All of the posts 3210 are attached to the bottom surface of the tibia 20 after horizontal osteotomy.

The end of each post 3210 distal to tibial prosthesis 3100 is spherical. The post 3210 is adapted to be used by a patient having a distal tibia 20 with a relatively good bone mass, and the tibial prosthesis 3100 is effectively attached to the distal tibia 20 by tapping. The angled disposition of post 3210 toward the anterior side of tibial prosthesis 3100 facilitates the coupling of post 3210 with tibia 20.

The structure of this patent avoids prosthesis and skeleton or soft tissue striking simultaneously, has covered the skeleton form after the distal end skeleton of shin bone 20 cuts the bone as far as, very big reduction postoperative complication's incidence.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.