阅读说明：本技术 距骨植入件 (Talus implant ) 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：本发明提供一种距骨植入件,包括：距骨假体本体,距骨假体本体的底面上具有支撑平面；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；内侧前部的顶面为内侧前顶圆弧面,内侧后部的顶面为内侧后顶圆弧面；内侧前顶圆弧面与所述内侧后顶圆弧面相切；外侧前部的顶面为外侧前顶圆弧面,外侧后部的顶面为外侧后顶圆弧面；外侧前顶圆弧面与外侧后顶圆弧面相切；内侧最高切点高度大于外侧最高切点高度；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。本发明的距骨植入件符合亚洲人踝关节距骨穹隆面的解剖学特点。(The present invention provides a talus implant comprising: the talar prosthesis comprises a talar prosthesis body, wherein a supporting plane is arranged on the bottom surface of the talar prosthesis body; the inner side part comprises an inner front part and an inner rear part which are connected, and the outer side part comprises an outer front part and an outer rear part which are 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 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 arc surface is tangent with the outer side rear top arc surface; 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 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 talar implant of the present invention conforms to the anatomical features of the talar dome of the asian ankle joint.)

1. A talar implant for mounting on a calcaneus bone (10), the medial side of the talar implant being closer to a tibia bone (20) than the lateral side of the talar implant, the anterior side of the talar implant being closer to a toe than the posterior side of the talar implant; it is characterized in that the preparation method is characterized in that,

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).

2. The talar implant of 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).

3. The talar implant of claim 1 or 2, wherein: the radius of the inner side front top arc surface (111) ranges from 12 mm to 22mm, and the radius of the inner side rear top arc surface (121) ranges from 17mm to 27 mm; the radius of the outer side front top arc surface (131) and the radius of the outer side rear top arc surface (141) both have the value range of 15-25 mm.

4. The talar implant of claim 2, 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 talar implant of claim 2, wherein: 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 a support plane (101); the inner side surface (122) of the inner rear part (120) and the outer side surface (142) of the outer rear part (140) extend towards the rear of the talar prosthesis body (100) and form an included angle of 9-13 degrees.

6. The talar implant of claim 2, 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.

7. The talar implant of claim 6, wherein: the radius of the front side (113) of the inner front part (110) ranges from 35 to 40 mm; the radius of the rear side (123) of the inner rear portion (120) ranges from 34 to 39 mm; the radius of the front side (133) of the outer front part (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.

8. The talar implant of claim 6, 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.

9. The talar implant of claim 8, wherein: the radius of the front side of the first inner front fillet part (114) ranges from 1 mm to 5 mm; the radius of the rear side of the first inner rear fillet (124) ranges from 1 mm to 5 mm; the radius of the front side of the first outer front fillet part (134) ranges from 3 mm to 7 mm; the radius of the rear side of the first outside rear fillet (144) ranges from 2 to 6 mm.

10. The talar implant of claim 8, 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).

11. The talar implant of claim 10, 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).

12. The talar implant of claim 11, 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).

13. The talar implant of claim 12, wherein:

a connecting line between a tangent point of the front side of the first outer front rounded corner portion (134) and the front side (133) of the outer front portion (130) and a highest point at which the outer front top circular arc surface (131) and the outer rear top circular arc surface (141) are tangent is an outer front oblique connecting line, on a plane which passes through the outer front oblique connecting line and is perpendicular to the support plane (101), a perpendicular line which is perpendicular to the outer front oblique connecting line and intersects with a midpoint of the outer front oblique connecting line is an outer front oblique perpendicular line, an intersection point of the outer front oblique perpendicular line and the outer front top circular arc surface (131) is an outer front top middle position point, and a distance between the outer front top middle position point and the front inclined plane (1021) is 3-8 mm;

a connecting line between a tangent point of the rear side edge of the first outer rear fillet part (144) and the rear side edge (143) of the outer rear part (140) and a highest point of the tangent position of the outer rear top arc surface (141) and the outer front top arc surface (131) is an outer rear oblique connecting line; pass through outer rear portion slant line and perpendicular to on the plane of supporting plane (101), perpendicular to outer rear portion slant line and with the crossing perpendicular line of mid point of outer rear portion slant line is outside rear side slant perpendicular line, outside rear side slant perpendicular line with the crossing point of top circular arc surface (141) is top intermediate position point behind the outside, top intermediate position point behind the outside with the distance between back inclined plane (1022) is 3-8 mm.

14. The talar implant of claim 12, wherein: the distance between the upper bottom surface (1023) and the support plane (101) is 3-10 mm.

15. The talar implant of claim 12, wherein: the distance between the highest point of the tangent position of the outer side rear top arc surface (141) and the outer side front top arc surface (131) and the upper bottom surface (1023) is 3-8 mm;

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 upper bottom surface (1023) is 3.5-10.5 mm.

16. The talar implant of claim 12, 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).

17. The talar implant of claim 2, wherein: the connection line formed by 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) is connected with 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), the plane which is perpendicular to the supporting plane (101) through the top connection line is a top vertical plane, the intersection point of a straight line which is perpendicular to the supporting plane (101) and the top surface of the talus prosthesis body (100) through the midpoint of the top connection line is a middle connection point on the top vertical plane, and the middle connection point is located at the intersection position of the inner side front top arc surface (111), the inner side rear top arc surface (121), the outer side front top arc surface (131) and the outer side rear top arc surface (141).

18. The talar implant of claim 17, wherein: 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.

19. The talar implant of claim 17, wherein: 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) is 0.5-2.5mm higher than 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).

Technical Field

The invention relates to the technical field of medical prosthesis structures, in particular to a talus implant.

Background

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.

The total ankle replacement system of chinese patent application No. CN201610170250.9, full ankle talar prosthesis with anchor holes and recesses, filed as riter medical technology corporation, usa, includes a talar implant and a tibial implant. The total ankle replacement system of this patent is similar to a typical ankle prosthesis in that the upper portion of the tibial implant is connected to the bone at the lower end of the tibia; the lower part of the tibial implant is in contact with the polyethylene lining in a plane-to-plane mode but is in a non-fixed movable structure, or the lower part of the tibial implant is in fixed connection with the polyethylene lining in a plane-to-plane mode and is connected with the polyethylene lining in a buckling mode. The talar implant includes a body having an articulating surface and an opposing bone contacting surface. The body has a predetermined thickness between the articulating surface and the bone contacting surface, in which the articulating surface is shown as a saddle, i.e., in the shape of two hemispheres, which is a symmetrical structure. The articulating surfaces in this patent show shapes that are common in the prior art. Therefore, the complex anatomical features of the talus are not fully reflected in the current ankle prosthesis talus components, which are in non-anatomical form and can cause post-replacement ankle kinematic abnormalities.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem underlying the present invention is to provide a talar implant.

To achieve the above and other related objects, the present invention provides a talar implant, the medial side of which is closer to the tibia than the lateral side of the talar implant, the anterior side of which is closer to the toes 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.

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.

Preferably, the radius of the inner side front top arc surface ranges from 12 mm to 22mm, and the radius of the inner side rear top arc surface ranges from 17mm to 27 mm; the radius of the outer side front top arc surface and the radius of the outer side rear top arc surface both have the value range of 15-25 mm.

Further, any plane parallel to the medial-lateral direction of the talar prosthesis body and perpendicular to the support 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 parallel to the internal and external directions of the talus prosthesis body and vertical to the supporting plane is a rear 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.

Furthermore, the inner side surface of the inner front part is coplanar with the inner side surface of the inner rear part, the outer side surface of the outer front part is coplanar with the outer side surface of the outer rear part, and the outer side surface of the inner rear part and the outer side surface of the outer rear part are both perpendicular to a support plane; the inner side surface of the inner rear part and the outer side surface of the outer rear part extend towards the rear of the talar prosthesis body, and the included angle formed by the inner side surface of the inner rear part and the outer side surface of the outer rear part is 9-13 degrees.

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, the radius of the front side of the inner front part ranges from 35 mm to 40 mm; the radius of the rear side edge of the rear part of the inner side ranges from 34 mm to 39 mm; the radius of the front side edge of the front part of the outer side ranges from 12 mm to 17 mm; the radius of the rear side of the lateral posterior portion ranges from 40 to 45 mm.

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, the radius of the front side of the first inner front fillet is 1-5 mm; the radius of the rear side edge of the first inner rear fillet part ranges from 1 mm to 5 mm; the radius of the front side edge of the first outer front fillet part ranges from 3 mm to 7 mm; the radius of the rear side of the first outside rear fillet portion ranges from 2mm to 6 mm.

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, a connecting line between a tangent point of the front side of the first outer front fillet portion and the front side of the outer front portion and a highest point at a tangent point of the outer front top arc surface and the outer rear top arc surface is an outer front oblique connecting line, on a plane which passes through the outer front oblique connecting line and is perpendicular to the support plane, a perpendicular line which is perpendicular to the outer front oblique connecting line and intersects with a midpoint of the outer front oblique connecting line is an outer front oblique perpendicular line, an intersection point of the outer front oblique perpendicular line and the outer front top arc surface is an outer front top middle position point, and a distance between the outer front top middle position point and the front oblique plane is 3-8 mm; a tangent point of the rear side edge of the first outer rear fillet part, which is tangent to the rear side edge of the outer rear part, is connected with a highest point of the tangent position of the outer rear top arc surface and the outer front top arc surface, and a connecting line of the rear side edge of the first outer rear fillet part and the highest point of the tangent position of the outer rear top arc surface is an outer rear oblique connecting line; the outer rear portion oblique connecting line is perpendicular to the plane of the supporting plane, a perpendicular line perpendicular to the outer rear portion oblique connecting line and intersecting with a middle point of the outer rear portion oblique connecting line is an outer rear side oblique perpendicular line, an intersection point of the outer rear side oblique perpendicular line and the outer rear top circular arc surface is an outer rear top middle position point, and the distance between the outer rear top middle position point and the rear inclined plane is 3-8 mm.

Furthermore, the distance between the upper bottom surface and the supporting plane is 3-10 mm.

Furthermore, the distance between the highest point of the tangent position of the outer side rear top arc surface and the outer side front top arc surface and the upper bottom surface is 3-8 mm; 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 upper bottom surface is 3.5-10.5 mm.

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.

Furthermore, a connection line formed by connecting the highest point of the tangent position of the inner side front top arc surface and the inner side rear top arc surface with the highest point of the tangent position of the outer side front top arc surface and the outer side rear top arc surface is a top connection line, a plane which passes through the top connection line and is perpendicular to the supporting plane is a top vertical plane, on the top vertical plane, an intersection point of a straight line which passes through the midpoint of the top connection line and is perpendicular to the supporting plane and the top surface of the talus prosthesis body is a middle connection point, and the middle connection point is located at the intersection position of the inner side front top arc surface, the inner side rear top arc surface, the outer side front top arc surface and the outer side rear top arc surface.

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

Furthermore, the highest point of the tangent position of the inner side front top arc surface and the inner side rear top arc surface is 0.5-2.5mm higher than the highest point of the tangent position of the outer side front top arc surface and the outer side rear top arc surface.

As described above, the talus implant of the present invention has 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 radii of the inner side front top arc surface, the outer side front top arc surface and the outer side rear top arc surface are adjusted, and the multi-radius asymmetric structural requirements of the ankle joint kinematics can be met;

4) the talus implant disclosed by the invention conforms to 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 from sinking or the talus implant from colliding with surrounding tissues;

5) the anterior and posterior concave sutures join to form a talus top notch to facilitate stable contact of the inner pad with the talus implant.

Drawings

Fig. 1 is a medial perspective view of a talar implant for mounting at the ankle of a right foot according to an embodiment of the present invention.

Fig. 2 is a perspective view of the lateral side of the talar implant for mounting at the ankle of a right foot according to this embodiment.

Fig. 3 shows a front view of the talar implant of this embodiment.

Fig. 4 shows a posterior view of the talar implant of this embodiment.

Fig. 5 shows a left side view of the talar implant of this embodiment.

Fig. 6 shows a right side view of the talar implant of this embodiment.

Fig. 7 shows a top view of the talar implant of this embodiment.

Fig. 8 illustrates a bottom view of the talar implant of this embodiment.

Fig. 9 is a schematic view of the talar implant of this embodiment installed at the ankle of a right foot.

Description of the reference numerals

10 calcaneus

20 tibia bone

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

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. 1-9, the talar implant of this embodiment, for mounting on the calcaneus 10 on the ankle of a right foot, has a medial side closer to the tibia 20 than a lateral side of the talar implant, and a anterior side closer to the toes than a 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 is connected to the posterior concave slot 160 to form a talus crest 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 a at the tangent position 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 at 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.

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;

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 anterior concave slot 150 connects with the posterior concave slot 160 to form a talus top concave slot; facilitating stable contact of the inner pad with the talar implant.

The radius of the outer front top arc surface 131 is equal to or smaller than the radius of the outer rear top arc surface 141, and the radius of the inner front top arc surface 111 is equal to or smaller 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 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 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.