Artificial ankle prosthesis components

Abstract

The present invention provides an artificial ankle joint prosthesis component, comprising: a talar implant, a tibial component and an inner lining block; the inner side of the talar prosthesis body comprises a connected inner front part and an inner rear part, and the outer side comprises a connected outer front part and an outer rear part; the radius of the inner rear top circular arc surface is greater than the radius of the inner front top circular arc surface; the radius of the inner rear top circular arc surface is greater than the radius of the outer front top circular arc surface; the radius of the inner rear top circular arc surface is greater than the radius of the outer rear top circular arc surface; the radius of curvature of the inner arc-shaped recessed portion is equal to the radius of the inner rear top circular arc surface, and the radius of curvature of the outer arc-shaped recessed portion is equal to the radius of the outer rear top circular arc surface; the outer side wall of the inner arc-shaped recessed portion and the inner side wall of the outer arc-shaped recessed portion intersect to form a bottom protruding edge; the bottom protruding edge of the inner lining block is inserted into the concave groove at the top of the talus; the top surface of the lining block is connected to the tibial component. The artificial ankle joint prosthesis component of the present invention is used in ankle replacement surgery.

Description

Technical Field

[0001] The invention relates to the technical field of medical prosthesis structures, in particular to an artificial ankle joint prosthesis component. Background Art

[0002] The ankle joint is composed of the articular surfaces of the lower ends of the tibia and fibula and the talar pulley, so it is also called the talocrural joint. The joint socket formed by the lower articular surface of the tibia and the medial and lateral malleolus joint surfaces accommodates the talar pulley. Since the joint surface of the pulley is wide in front and narrow in the back, when the foot is dorsiflexed, the wider front part enters the socket and the joint is stable; but when the foot is plantar flexed, such as when walking downhill, the narrower rear part of the pulley enters the socket, the ankle joint is loose and can move sideways. At this time, the ankle joint is prone to sprains, among which inversion injuries are the most common, because the lateral malleolus is longer and lower than the medial malleolus, which can prevent the talus from excessive inversion.

[0003] The talus is the second largest tarsal bone in the human body and is crucial to the function and biomechanics of the ankle joint. Studies have shown that the curvature of the medial and lateral domes of the talus is asymmetric, and the curvature of the medial and lateral domes in front and back is not consistent. The cross-sectional shape of the tibial prosthesis of the current tibial component is mostly oblique rectangle, trapezoid or ellipse.

[0004] How to design an artificial ankle prosthesis component that conforms to the ankle joint structure of Asians is a problem that technicians in this field need to solve. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the technical problem solved by the present invention is to provide an artificial ankle joint prosthesis component.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides an artificial ankle joint prosthesis component, comprising: a talar implant, a tibial component and an inner liner; the talar implant is used to be installed on the calcaneus, the inner side of the talar implant is closer to the tibia than the outer side of the talar implant, and the front side of the talar implant is closer to the toe than the rear side of the talar implant; the talar implant comprises: a talar prosthesis body, the bottom surface of the talar prosthesis body has a support plane; the talar prosthesis body comprises a connected inner side portion and an outer side portion; the inner side portion comprises a connected inner front portion and an inner rear portion, and the outer side portion comprises a connected outer front portion and an outer rear portion; The top surface of the inner front portion is the inner front top arc surface, and the top surface of the inner rear portion is the inner rear top arc surface; the inner front top arc surface is tangent to the inner rear top arc surface; the inner front top arc surface and the inner rear top arc surface are both concave downward from the inside to the outside; the top surface of the outer front portion is the outer front top arc surface, and the top surface of the outer rear portion is the outer rear top arc surface; the outer front top arc surface is tangent to the outer rear top arc surface; the outer front top arc surface and the outer rear top arc surface are both concave downward from the outside to the inside; the outer side surface of the inner front portion is connected and coplanar with the inner side surface of the outer front portion, and the outer side surface of the inner rear portion is connected and coplanar with the inner side surface of the outer rear portion; the inner front The top of the connection with the outer front part forms an anterior concave seam, and the top of the connection between the inner rear part and the outer rear part forms a posterior concave seam; the anterior concave seam is connected to the posterior concave seam to form a concave seam at the top of the talus; the distance between the highest point where the inner front top arc surface is tangent to the inner rear top arc surface and the support plane is the inner highest tangent point height; the distance between the highest point where the outer front top arc surface is tangent to the outer rear top arc surface and the support plane is the outer highest tangent point height; the inner highest tangent point height is greater than the outer highest tangent point height; the radius of the inner rear top arc surface is greater than the radius of the inner front top arc surface; the radius of the inner rear top arc surface is greater than the half of the outer front top arc surface diameter; the radius of the inner posterior top circular arc surface is greater than the radius of the outer posterior top circular arc surface; the inner lining block has a lining block top surface and a lining block bottom surface which are arranged opposite to each other; the lining block bottom surface of the inner lining block contacts the top of the talar prosthesis body, and an inner arc-shaped recessed portion and an outer arc-shaped recessed portion are provided on the lining block bottom surface of the inner lining block along the inner and outer directions of the inner lining block; the curvature radius of the inner arc-shaped recessed portion is equal to the radius of the inner posterior top circular arc surface, and the curvature radius of the outer arc-shaped recessed portion is equal to the radius of the outer posterior top circular arc surface; a bottom convex edge is formed at the intersection of the outer side wall of the inner arc-shaped recessed portion and the inner side wall of the outer arc-shaped recessed portion; the bottom convex edge of the inner lining block is inserted into the concave groove at the top of the talus and can move along the concave groove at the top of the talus;The top surface of the pad is connected to the tibial component, and the tibial component is used to be installed on the bottom of the tibia.

[0007] Preferably, the front side surface of the lining block and the rear side surface of the lining block are both arc surfaces; the inner side surface of the lining block and the outer side surface of the lining block are planes parallel to each other.

[0008] Preferably, the radius of the outer front top arc surface is less than or equal to the radius of the outer rear top arc surface, and the radius of the inner front top arc surface is less than or equal to the radius of the outer front top arc surface.

[0009] Furthermore, any front plane parallel to the in-out direction of the talar prosthesis body and perpendicular to the support plane is a front vertical plane; an intersection line where any one of the front vertical planes intersects with the outer side surface of the inner front portion is a front intersection line; along the in-out direction of the talar prosthesis body, the distance between the front intersection line and the inner side surface of the inner front portion is the width of the inner front portion, and the distance between the front intersection line and the outer side surface of the outer front portion is the width of the outer front portion; along the front-to-back direction of the talar prosthesis body, the width of the inner front portion and the width of the outer front portion both decrease successively, and on the same front vertical plane, the width of the inner front portion is greater than the width of the outer front portion. width; any rear plane parallel to the in-out direction of the talar prosthesis body and perpendicular to the support plane is a rear vertical plane; the intersection line of any one of the rear vertical planes and the outer side surface of the inner rear portion is a rear intersection line; along the in-out direction of the talar prosthesis body, the distance between the rear intersection line and the inner side surface of the inner rear portion is the width of the inner rear portion, and the distance between the rear intersection line and the outer side surface of the outer rear portion is the width of the outer rear portion; along the front-to-back direction of the talar prosthesis body, the width of the inner rear portion and the width of the outer rear portion both decrease successively, and on the same rear vertical plane, the width of the inner rear portion is greater than the width of the outer rear portion.

[0010] Furthermore, the front side of the inner front portion is a circular arc line that is concave backwards; the rear side of the inner rear portion is a circular arc line that is concave forwards; the front side of the outer front portion is a circular arc line that is concave backwards; and the rear side of the outer rear portion is a circular arc line that is concave forwards.

[0011] Furthermore, a first inner front rounded corner portion is provided at the intersection of the inner front top arc surface and the inner side surface of the inner front portion; the front side edge of the first inner front rounded corner portion is an arc edge; a first inner rear rounded corner portion is provided at the intersection of the inner rear top arc surface and the inner side surface of the inner rear portion; the rear side edge of the first inner rear rounded corner portion is an arc edge; a first outer front rounded corner portion is provided at the intersection of the outer front top arc surface and the outer side surface of the outer front portion; the front side edge of the first outer front rounded corner portion is an arc edge; a first outer rear rounded corner portion is provided at the intersection of the outer rear top arc surface and the outer side surface of the outer rear portion; the rear side edge of the first outer rear rounded corner portion is an arc edge.

[0012] Furthermore, the front side edge of the first inner front rounded corner portion is tangent to the front side edge of the inner front portion; the rear side edge of the first inner rear rounded corner portion is tangent to the rear side edge of the inner rear portion; the front side edge of the first outer front rounded corner portion is tangent to the front side edge of the outer front portion; and the rear side edge of the first outer rear rounded corner portion is tangent to the rear side edge of the outer rear portion.

[0013] Furthermore, the bottom surface of the talar prosthesis body is provided with a notch, and the notch penetrates to the inner side and the outer side of the talar prosthesis body.

[0014] Furthermore, the cross-section of the recess is a trapezoidal cross-section; the recess has a relative front bevel and a rear bevel, the front bevel is located on the front side of the rear bevel, an upper bottom surface is connected between the front bevel and the rear bevel, and the upper bottom surface is parallel to the support plane.

[0015] Furthermore, the talar prosthesis body is provided with an inner anchor and an outer anchor, both of which are mounted on the front inclined plane, the inner anchor is located at the inner front portion, and the outer anchor is located at the outer front portion.

[0016] Preferably, the tibial component comprises: a tibial prosthesis and a tibial connecting part connected to the tibial prosthesis; the tibial prosthesis is a plate body, the tibial prosthesis has a plate body top surface, a plate body bottom surface and a plate body circumferential side surface between the plate body top surface and the plate body bottom surface, the plate body top surface is connected to the tibial connecting part, 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 contour of the plate body top surface; the plate body circumferential side surface comprises a front arc surface, a concave arc surface, a rear arc surface and a vertical side surface connected in sequence, the front arc surface is arranged opposite to the rear arc surface, and the concave arc surface is arranged opposite to the vertical side surface; the front arc surface and the rear arc surface are convex outwardly, the concave arc surface is concave inwardly, and the vertical side surface is a plane perpendicular to the bottom surface of the plate body; the top surface of the pad is connected to the bottom surface of the plate body.

[0017] Further, the front curved surface is connected to the concave curved surface through a front concave side curved surface, and the front curved surface and the concave curved surface are both tangent to the front concave side curved surface; the rear curved surface is connected to the concave curved surface through a rear concave side curved surface, and the rear curved surface and the concave curved surface are both tangent to the rear concave side curved surface; the vertical side surface is connected to the rear curved surface through a rear vertical side curved surface, and the vertical side surface and the rear curved surface are both tangent to the rear vertical side curved surface; the front curved surface is connected to the vertical side surface through a front vertical side curved surface, and the front curved surface and the vertical side surface are The straight side surfaces are all tangent to the front vertical side arc surface; along the direction parallel to the vertical side surface, the tangency between the front side arc surface and the front vertical side arc surface is in front of the tangency between the front side arc surface and the front concave side arc surface, and the tangency between the rear side arc surface and the rear vertical side arc surface is in front of the tangency between the rear side arc surface and the rear concave side arc surface; along the direction perpendicular to the vertical side surface, the tangency between the rear side arc surface and the rear concave side arc surface is closer to the vertical side surface than the tangency between the front side arc surface and the front concave side arc surface.

[0018] Furthermore, along the direction perpendicular to the vertical side surface, the tangency between the concave arc surface and the rear concave side arc surface is closer to the vertical side surface than the tangency between the front concave side arc surface and the concave arc surface.

[0019] Furthermore, the tibial connecting part is a plurality of columnar bodies, all of the columnar bodies are arranged obliquely relative to the top surface of the plate body, and the inclination directions of all the columnar bodies are the same.

[0020] Furthermore, a convex strip is provided 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 slot for the convex strip to be inserted into is provided on the top surface of the lining block of the inner lining block.

[0021] As described above, the talus implant and the artificial ankle joint prosthesis assembly of the present invention have the following beneficial effects:

[0022] 1) The talar prosthesis body of the talar implant of the present invention conforms to the anatomical characteristics of the talar dome surface of the ankle joint of Asians. The height of the highest tangent point on the inner side of the talar prosthesis body is greater than the height of the highest tangent point on the outer side, which conforms to the anatomical characteristics of the asymmetry of the highest points of the inner and outer domes of the talus; since the radius of the inner posterior top arc surface is greater than the radius of the inner anterior top arc surface; the radius of the inner posterior top arc surface is greater than the radius of the outer anterior top arc surface; the radius of the inner posterior top arc surface is greater than the radius of the outer posterior top arc surface, this structure is more in line with the anatomical characteristics of the talar dome surface of the ankle joint of Asians;

[0023] 2) The inner front top arc surface is tangent to the inner rear top arc surface, and the outer front top arc surface is tangent to the outer rear top arc surface; the arc surfaces are connected by a tangent position transition structure to avoid the influence of the change of curvature on the joint movement;

[0024] 3) Since the radius of curvature of the inner arc-shaped recessed portion is equal to the radius of the inner posterior top circular arc surface, and the radius of curvature of the outer arc-shaped recessed portion is equal to the radius of the outer posterior top circular arc surface; the outer wall of the inner arc-shaped recessed portion and the inner wall of the outer arc-shaped recessed portion intersect to form a bottom convex edge; the bottom convex edge of the lining block is inserted into the concave groove at the top of the talus and can move along the concave groove at the top of the talus; this structure enables the lining block to simulate the process of ankle joint movement during the relative movement of the top of the talar prosthesis body;

[0025] 4) The artificial ankle joint prosthesis component of the present invention conforms to the anatomical characteristics of the talus of the ankle joint of Asians, and can avoid ankle kinematic abnormalities caused by ankle replacement surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shown is a schematic three-dimensional structure diagram of an artificial ankle joint prosthesis component of this embodiment for installation on the right ankle.

[0027] Figure 2 Shown is a schematic structural diagram of the outer side of an artificial ankle joint prosthesis component of this embodiment for installation on the right ankle.

[0028] Figure 3 Shown is a schematic structural diagram of the inner side of an artificial ankle joint prosthesis component of this embodiment for installation on the right ankle.

[0029] Figure 4 The figure shows the inner three-dimensional structure of the talus implant of the artificial ankle joint prosthesis assembly installed in the right ankle of this embodiment.

[0030] Figure 5 The diagram shows the lateral stereoscopic structure of the talus implant of the artificial ankle joint prosthesis assembly installed in the right ankle of this embodiment.

[0031] Figure 6Shown is a front view of a talar implant of an artificial ankle prosthesis assembly of this embodiment.

[0032] Figure 7 A rear view of the talar implant of the artificial ankle prosthesis assembly of this embodiment is shown.

[0033] Figure 8 Shown is a left side view of the talar implant of the artificial ankle prosthesis assembly of this embodiment.

[0034] Fig. 9 Shown is a right side view of the talar implant of the artificial ankle prosthesis assembly of this embodiment.

[0035] Fig.10 The figure shows a top view of the talus implant of the artificial ankle prosthesis assembly of the present embodiment.

[0036] Fig.11 A bottom view of the talus implant of the artificial ankle prosthesis assembly of this embodiment is shown.

[0037] Fig.12 Shown is a schematic diagram of the bottom structure of the lining block of the artificial ankle joint prosthesis assembly of this embodiment.

[0038] Fig.13 Shown is a schematic diagram of the top structure of the lining block of the artificial ankle joint prosthesis component of this embodiment.

[0039] Fig.14 It is a schematic structural diagram showing one side of the tibial prosthesis of the artificial ankle prosthesis assembly of this embodiment where a concave arc surface is provided.

[0040] Fig.15 It is a schematic structural diagram showing that the bottom surface of the plate body of the tibial prosthesis of the artificial ankle joint prosthesis assembly of this embodiment is not provided with convex strips and reinforcing strips.

[0041] Fig.16 Shown is a schematic structural diagram of the top surface of the plate of the tibial prosthesis of the artificial ankle joint prosthesis assembly of this embodiment.

[0042] Fig.17 It shows a schematic structural diagram of the artificial ankle prosthesis assembly installed at the right ankle joint when no convex strips and reinforcing strips are provided on the bottom surface of the plate body of the tibial prosthesis of the artificial ankle prosthesis assembly of this embodiment and no slots are provided on the lining block.

[0043] Description of Figure Numbers

[0044] 10 Calcaneus

[0045] 20 Tibia

[0046] 30 Fibula

[0047] 100 Talus prosthesis body

[0048] 101 Support plane

[0049] 102 Notch

[0050] 1021 front bevel

[0051] 1022 Back Bevel

[0052] 1023 Upper bottom surface

[0053] 110 Inside front

[0054] 111 medial anterior top arc surface

[0055] 112 Medial surface of medial front

[0056] 113 Front side of the inner front part

[0057] 114 First inner front fillet

[0058] 120 Inner rear

[0059] 121 medial posterior top arc surface

[0060] 122 Medial surface of medial posterior part

[0061] 123 Rear side of the inner rear part

[0062] 124 First inner rear fillet

[0063] 130 Outer front

[0064] 131 outer front top arc surface

[0065] 132 Outer side of the outer front

[0066] 133 Front side of the outer front part

[0067] 134 first outer front fillet

[0068] 140 Outer rear

[0069] 141 Lateral posterior top arc surface

[0070] 142 Lateral side of the lateral rear part

[0071] 143 Rear side of the outer rear part

[0072] 144 first outer rear fillet

[0073] 150 Front recessed seam

[0074] 160 Rear recessed seam

[0075] 210 Internal anchor

[0076] 220 External anchor

[0077] L1 External front oblique line

[0078] L2 outer rear oblique line

[0079] i The point where the front side surface of the first outer front fillet portion is tangent to the front side edge of the outer front portion

[0080] d The point of tangency between the rear side surface of the first outer rear fillet and the rear side edge of the outer rear portion

[0081] a The highest point where the outer front top arc surface is tangent to the outer rear top arc surface

[0082] 3100 Tibial Prosthesis

[0083] 3110 Top surface of plate

[0084] 3120 Bottom of plate

[0085] 3121 convex strip

[0086] 3122 inner bevel

[0087] 3123 Reinforcement Strip

[0088] 3130 Circumferential side of plate

[0089] 3131 Front curved surface

[0090] 3132 Anterior concave side curved surface

[0091] 3133 Concave curved surface

[0092] 3134 Rear concave side curved surface

[0093] 3135 rear curved surface

[0094] 3136 Rear vertical side curved surface

[0095] 3137 Vertical side

[0096] 3138 Front vertical side curved surface

[0097] 3141 The tangent point between the front curved surface and the front vertical curved surface

[0098] 3142 Tangent point between the front curved surface and the front concave curved surface

[0099] 3143 Tangent point between the rear curved surface and the rear vertical curved surface

[0100] 3144 Tangent point between the rear curved surface and the rear concave curved surface

[0101] 3145 Tangent point between the front concave side arc surface and the concave arc surface

[0102] 3146 Tangent point between the concave curved surface and the posterior concave curved surface

[0103] 3200 Tibial connection

[0104] 3210 Column

[0105] 400 Liner Block

[0106] 401 Front side of liner block

[0107] 402 Rear side of liner block

[0108] 403 Inner side of liner block

[0109] 404 Outer side of liner block

[0110] 410 Pad top surface

[0111] 420 Pad bottom

[0112] 421 inner arc-shaped recess

[0113] 422 outer arc-shaped recess

[0114] 423 Bottom raised edge

[0115] 430 card slot

[0116] 431 Internal inclined wall

[0117] 441 Front bevel

[0118] 442 Rear Slope DETAILED DESCRIPTION

[0119] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0120] Please refer to the attached drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the attached drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0121] like Figures 1 to 17 As shown, the artificial ankle joint prosthesis assembly of this embodiment is used to be installed in the right ankle, and the artificial ankle joint prosthesis assembly includes: a talus implant, a tibial assembly and an inner lining block 400;

[0122] A talar implant for installation on a calcaneus 10, wherein the medial side of the talar implant is closer to the tibia 20 than the lateral side of the talar implant, and the anterior side of the talar implant is closer to the toes than the posterior side of the talar implant;

[0123] The talar implant comprises: a talar prosthesis body 100, and a support plane 101 is provided on the bottom surface of the talar prosthesis body 100;

[0124] The talar prosthesis body 100 includes a connected medial portion and a connected lateral portion; the medial portion includes a connected medial front portion 110 and a connected medial rear portion 120, and the lateral portion includes a connected lateral front portion 130 and a connected lateral rear portion 140;

[0125] The top surface of the inner front portion 110 is the inner front top arc surface 111, and the top surface of the inner rear portion 120 is the 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 concave downwards from the inside to the outside;

[0126] The top surface of the outer front portion 130 is an outer front top arc surface 131, and the top surface of the outer rear portion 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 surface 131 and the outer rear top arc surface 141 are both concave downwards in a direction from outside to inside;

[0127] The lateral side of the medial front portion 110 is connected to the medial side of the lateral front portion 130 and is coplanar, and the lateral side of the medial rear portion 120 is connected to the medial side of the lateral rear portion 140 and is coplanar; the top of the connection between the medial front portion 110 and the lateral front portion 130 forms an anterior recessed seam 150, and the top of the connection between the medial rear portion 120 and the lateral rear portion 140 forms a posterior recessed seam 160; the anterior recessed seam 150 is connected to the posterior recessed seam 160 to form a recessed seam at the top of the talus;

[0128] The distance between the highest point where the inner front top arc surface 111 and the inner rear top arc surface 121 are tangent to the support plane 101 is the inner highest tangent point height; the distance between the highest point where the outer front top arc surface 131 and the outer rear top arc surface 141 are tangent to the support plane 101 is the outer highest tangent point height; the inner highest tangent point height is greater than the outer highest tangent point height;

[0129] The radius of the inner rear top arc surface 121 is greater than the radius of the inner 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 inner rear top arc surface 121 is greater than the radius of the outer rear top arc surface 141;

[0130] The inner liner block 400 has a liner block top surface 410 and a liner block bottom surface 420 that are arranged opposite to each other;

[0131] The liner bottom surface 420 of the liner block 400 contacts the top of the talar prosthesis body 100. Along the inner and outer directions of the liner block 400, an inner arc-shaped recessed portion 421 and an outer arc-shaped recessed portion 422 are provided on the liner bottom surface 420 of the liner block 400; the curvature radius of the inner arc-shaped recessed portion 421 is equal to the radius of the inner rear top circular arc surface 121, and the curvature radius of the outer arc-shaped recessed portion 422 is equal to the radius of the outer rear top circular arc surface 141; a bottom protruding edge 423 is formed at the intersection of the outer side wall of the inner arc-shaped recessed portion 421 and the inner side wall of the outer arc-shaped recessed portion 422; the bottom protruding edge 423 of the liner block 400 is inserted into the recessed groove at the top of the talus and can move along the recessed groove at the top of the talus;

[0132] The pad top surface 410 is connected to the tibial component, which is used to be mounted on the bottom of the tibia 20.

[0133] The talar prosthesis body 100 of the talar implant of the present invention conforms to the anatomical characteristics of the talar dome surface of the ankle joint of Asians. The height of the highest tangent point on the inner side of the talar prosthesis body 100 is greater than the height of the highest tangent point on the outer side, which conforms to the anatomical characteristics of the asymmetry of the highest points of the inner and outer domes of the talus; since the radius of the inner posterior top arc surface 121 is greater than the radius of the inner anterior top arc surface 111; the radius of the inner posterior top arc surface 121 is greater than the radius of the outer anterior top arc surface 131; the radius of the inner posterior top arc surface 121 is greater than the radius of the outer posterior top arc surface 141, this structure is more in line with the anatomical characteristics of the talar dome surface of the ankle joint of Asians;

[0134] 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 arc surfaces are connected by a tangent position transition structure to avoid the influence of the change of curvature on the joint movement;

[0135] The radius of the medial front top arc surface 111, the lateral front top arc surface 131, the lateral front top arc surface 131 and the lateral rear top arc surface 141 are adjusted to meet the multi-radius asymmetric structural requirements of ankle joint kinematics;

[0136] Since the curvature radius of the inner arc-shaped recessed portion 421 is equal to the radius of the inner rear top circular arc surface 121, and the curvature radius of the outer arc-shaped recessed portion 422 is equal to the radius of the outer rear top circular arc surface 141; the intersection of the outer wall of the inner arc-shaped recessed portion 421 and the inner wall of the outer arc-shaped recessed portion 422 forms a bottom protruding edge 423; the bottom protruding edge 423 of the lining block 400 is inserted into the groove at the top of the talus and can move along the groove at the top of the talus; this structure enables the lining block 400 to simulate the process of ankle joint movement during the relative movement of the top of the talar prosthesis body;

[0137] The talus implant of the present invention conforms to the anatomical characteristics of the talus of the ankle joint of Asians, can avoid abnormal ankle joint kinematics after ankle replacement surgery, and can avoid sinking of the talus implant or collision of the talus implant with surrounding tissues.

[0138] The front side surface 401 of the lining block 400 and the rear side surface 402 of the lining block 400 are both arc surfaces. This structure makes it difficult to damage the soft tissues such as tendons or ligaments around the ankle joint during the relative movement of the lining block 400 with the top of the talar prosthesis body; the inner side surface 403 of the lining block 400 and the outer side surface 404 of the lining block 400 are parallel planes, and this structure is easy to process. The front side surface 401 of the lining block 400, the inner side surface 403 of the lining block 400, the rear side surface 402 of the lining block 400 and the outer side surface 404 of the lining block 400 are connected in sequence.

[0139] The maximum distance between the front side 401 of the lining block 400 and the rear side 402 of the lining block 400 is 32-37 mm, and the distance between the medial side 403 of the lining block 400 and the lateral side 404 of the lining block 400 is 22-27 mm. This structure conforms to the structure and size of the ankle joint of Asians.

[0140] The liner top surface 410 of the liner block 400 is a plane, and the liner bottom surface 420 of the liner block 400 is arranged parallel to the liner top surface 410 of the liner block 400; the front side of the liner block 400 has a front inclined surface 441, and the rear side of the liner block 400 has a rear inclined surface 442; the front inclined surface 441 is inclined upward, the upper part of the front inclined surface 441 is connected to the front side surface 401 of the liner block 400, and the lower part of the front inclined surface 441 is connected to the liner bottom surface 420 of the liner block 400; the rear inclined surface 442 is inclined, the upper part of the rear inclined surface 442 is connected to the rear side surface 402 of the liner block 400, and the lower part of the rear inclined surface 442 is connected to the liner bottom surface 420 of the liner block 400.

[0141] The top surface 410 of the liner block 400 is a plane, and the bottom surface 420 of the liner block 400 is arranged parallel to the top surface 410 of the liner block 400. This structure is easy to process; the top surface 410 of the liner block 400 is a plane, which also facilitates the connection between the top surface 410 of the liner block 400 and the bottom surface 3120 of the plate body of the tibial prosthesis 3100.

[0142] The front side of the liner block 400 has a front inclined surface 441, and the rear side of the liner block 400 has a rear inclined surface 442; the front inclined surface 441 is inclined upward, the upper part of the front inclined surface 441 is connected to the front side surface 401 of the liner block 400, and the lower part of the front inclined surface 441 is connected to the liner block bottom surface 420 of the liner block 400; the rear inclined surface 442 is inclined, the upper part of the rear inclined surface 442 is connected to the rear side surface 402 of the liner block 400, and the lower part of the rear inclined surface 442 is connected to the liner block bottom surface 420 of the liner block 400. This structure can prevent the liner block 400 from being dislocated relative to the talar prosthesis body.

[0143] In this embodiment, the angle between the front inclined surface 441 and the bottom surface 420 of the pad is greater than or equal to the angle between the rear inclined surface 442 and the bottom surface 420 of the pad; the angle between the front inclined surface 441 and the bottom surface 420 of the pad and the angle between the rear inclined surface 442 and the bottom surface 420 of the pad are both in the range of 30°-60°.

[0144] The following table shows the specific values ​​of various parameters in the three liner block 400 products:

[0145]

[0146] In the talar implant of this embodiment, the radius of the outer front top arc surface 131 is less than or equal to the radius of the outer rear top arc surface 141, and the radius of the inner front top arc surface 111 is less than or equal to the radius of the outer front top arc surface 131. The radius of the inner rear top arc surface 121 is greater than the radius of the inner 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 inner rear top arc surface 121 is greater than the radius of the outer rear top arc surface 141; it can meet the multi-center and multi-radius movement mode provided by the talus in the ankle cavity during the ankle joint movement. The present application can simulate the normal ankle joint in the process of dorsiflexion, and the normal tibiotalar joint movement axis tilts from the outer and lower to the inner and upper direction; on the contrary, in the process of plantar flexion, the normal tibiotalar joint movement axis tilts from the inner and lower to the outer and upper direction.

[0147] The radius of the inner front top arc surface 111 is in the range of 12-22 mm, the radius of the inner rear top arc surface 121 is in the range of 17-27 mm; the radius of the outer front top arc surface 131 and the radius of the outer rear top arc surface 141 are both in the range of 15-25 mm. This structure enables the structure of the top surface formed by the talar implant to be more in line with the anatomical characteristics of the talar dome surface of the ankle joint of Asians.

[0148] 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; an intersection line of any front vertical plane and the lateral side surface of the medial front portion 110 is a front intersection line; along the medial-lateral direction of the talar prosthesis body 100, the distance between the front intersection line and the medial side surface 112 of the medial front portion 110 is the width of the medial front portion 110, and the distance between the front intersection line and the lateral side surface 132 of the lateral front portion 130 is the width of the lateral front portion 130;

[0149] Along the front-back direction of the talar prosthesis body 100, the width of the medial front portion 110 and the width of the lateral front portion 130 are successively reduced. On the same front vertical plane, the width of the medial front portion 110 is greater than the width of the lateral front portion 130.

[0150] 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; an intersection line of any posterior vertical plane and the lateral side surface of the medial posterior portion 120 is a posterior intersection line; along the medial-lateral direction of the talar prosthesis body 100, the distance between the posterior intersection line and the medial side surface 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 surface 142 of the lateral posterior portion 140 is the width of the lateral posterior portion 140;

[0151] Along the front-to-back direction of the talar prosthesis body 100 , the width of the medial rear portion 120 and the width of the lateral rear portion 140 both decrease successively. On the same rear vertical plane, the width of the medial rear portion 120 is greater than the width of the lateral rear portion 140 .

[0152] Along the anterior-posterior direction of the talar prosthesis body 100, the width of the medial front portion 110 and the width of the lateral front portion 130 both decrease successively, and on the same anterior vertical plane, the width of the medial front portion 110 is greater than the width of the lateral front portion 130; along the anterior-posterior direction of the talar prosthesis body 100, the width of the medial rear portion 120 and the width of the lateral rear portion 140 both decrease successively, and on the same rear vertical plane, the width of the medial rear portion 120 is greater than the width of the lateral rear portion 140. This structure makes the structure of the talar prosthesis body 100 in the width direction conform to the structure of the talus of the ankle joint of Asians in the width direction.

[0153] The medial side surface 112 of the medial front portion 110 is coplanar with the medial side surface 122 of the medial rear portion 120, the lateral side surface 132 of the lateral front portion 130 is coplanar with the lateral side surface 142 of the lateral rear portion 140, and the lateral side surface 142 of the medial rear portion 120 and the lateral side surface 142 of the lateral rear portion 140 are both perpendicular to the support plane 101; the medial side surface 122 of the medial rear portion 120 and the lateral side surface 142 of the lateral rear portion 140 extend toward the rear of the talar prosthesis body 100, and the angle A formed is 9°-13°. This structure conforms to the structural characteristics and the extent of the narrowing of the talus from the front to the rear of the ankle joint of Asians.

[0154] The front side 113 of the medial front part 110 is a circular arc line that is concave backward; the rear side 123 of the medial rear part 120 is a circular arc line that is concave forward; the front side 133 of the lateral front part 130 is a circular arc line that is concave backward; and the rear side 143 of the lateral rear part 140 is a circular arc line that is concave forward. This structure conforms to the contour structure of the front and rear sides of the talus of the ankle joint of Asians, and can prevent the talus implant from damaging the tendons or ligaments and other soft tissues around the ankle joint after being installed on the calcaneus 10.

[0155] The radius of the front side 113 of the medial front part 110 is in the range of 35-40 mm; the radius of the rear side 123 of the medial rear part 120 is in the range of 34-39 mm; the radius of the front side 133 of the lateral front part 130 is in the range of 12-17 mm; the radius of the rear side 143 of the lateral rear part 140 is in the range of 40-45 mm. This structure makes the structure of the talus implant more compact and more in line with the contour structure of the front and rear sides of the talus of the ankle joint of Asians.

[0156] A first inner front rounded corner portion 114 is provided at the intersection of the inner front top arc surface 111 and the inner side surface 112 of the inner front portion 110; the front side edge of the first inner front rounded corner portion 114 is an arc edge;

[0157] A first inner rear rounded corner portion 124 is provided at the intersection of the inner rear top arc surface 121 and the inner side surface 122 of the inner rear portion 120; the rear side edge of the first inner rear rounded corner portion 124 is an arc edge;

[0158] A first outer front rounded corner portion 134 is provided at the intersection of the outer front top arc surface 131 and the outer side surface 132 of the outer front portion 130; the front side edge of the first outer front rounded corner portion 134 is an arc edge;

[0159] A first outer rear rounded corner portion 144 is provided at the intersection of the outer rear top arc surface 141 and the outer side surface 142 of the outer rear portion 140 ; ​​the rear side edge of the first outer rear rounded corner portion 144 is an arc edge.

[0160] The arrangement of the first medial anterior rounded corner portion 114, the first medial posterior rounded corner portion 124, the first lateral anterior rounded corner portion 134 and the first lateral posterior rounded corner portion 144 makes the contour of the talar implant smoother, thereby preventing the talar implant from damaging soft tissues such as tendons or ligaments around the ankle joint after being installed on the calcaneus 10.

[0161] The radius of the front side of the first inner front fillet 114 is in the range of 1-5mm; the radius of the rear side of the first inner rear fillet 124 is in the range of 1-5mm; the radius of the front side of the first outer front fillet 134 is in the range of 3-7mm; the radius of the rear side of the first outer rear fillet 144 is in the range of 2-6mm. This structure makes the structure of the talus implant more compact and more in line with the contour structure of the talus of the ankle joint of Asians.

[0162] The front side of the first inner front fillet 114 is tangent to the front side 113 of the inner front portion 110; the rear side of the first inner rear fillet 124 is tangent to the rear side 123 of the inner rear portion 120; the front side of the first outer front fillet 134 is tangent to the front side 133 of the outer front portion 130; the rear side of the first outer rear fillet 144 is tangent to the rear side 143 of the outer rear portion 140. This structure makes the profile of the talar implant more rounded.

[0163] The bottom surface of the talar prosthesis body 100 also has a notch 102, which passes through the inner side and the outer side of the talar prosthesis body 100. The setting of the notch 102 facilitates the installation of the talar prosthesis body 100 on the talus. The notch 102 passes through the inner side and the outer side of the talar prosthesis body 100, so that both sides of the talar prosthesis body 100 are open and unobstructed. This design feature ensures that after the ankle joint talar prosthesis body 100 is installed, the X-ray lateral film can clearly see the contact interface between the talar prosthesis body 100 and the bone host, avoiding the situation that the talar prosthesis body 100 is loose and cannot be discovered early through imaging examination.

[0164] The cross section of the notch 102 is a trapezoidal cross section; the notch 102 has a front bevel 1021 and a rear bevel 1022 that are opposite to each other, the front bevel 1021 is located in front of the rear bevel 1022, the upper bottom surface 1023 is connected between the front bevel 1021 and the rear bevel 1022, and the upper bottom surface 1023 is parallel to the support plane 101. The front bevel 1021, the upper bottom surface 1023 and the rear bevel 1022 form a three-surface structure to reduce the amount of bone resection when the talar prosthesis body 100 is installed, so that the talus retains more hard subchondral bone, and reduces the possibility of the talar prosthesis body 100 sinking.

[0165] In order to make the contour of the talar prosthesis body 100 more consistent with the contour structure of the talus of the ankle joint of Asians, the line connecting the highest point a where the lateral front top arc surface 131 and the lateral rear top arc surface 141 are tangent to the tangent point i where the front side edge of the first lateral front fillet 134 is tangent to the front side edge 133 of the lateral front portion 130 is the lateral front oblique line L1, and on the plane passing through the lateral front oblique line L1 and perpendicular to the support plane 101, the vertical line perpendicular to the lateral front oblique line L1 and intersecting with the midpoint of the lateral front oblique line L1 is the lateral front oblique vertical line, and the intersection of the lateral front oblique vertical line and the lateral front top arc surface 131 is the lateral front top middle position point, and the distance between the lateral front top middle position point and the front oblique surface 1021 is 3-8mm;

[0166] The line connecting the highest point a where the outer front top arc surface 131 and the outer rear top arc surface 141 are tangent to the tangent point d of the rear side edge of the first outer rear rounded corner portion 144 and the rear side edge 143 of the outer rear portion 140 is the outer rear oblique line L2; on the plane passing through the outer rear oblique line L2 and perpendicular to the support plane 101, the vertical line perpendicular to the outer rear oblique line L2 and intersecting with the midpoint of the outer rear oblique line L2 is the outer rear oblique vertical line, and the intersection of the outer rear oblique vertical line and the outer rear top arc surface 141 is the middle position point of the outer rear top, and the distance between the middle position point of the outer rear top and the rear oblique surface 1022 is 3-8mm.

[0167] The distance between the upper bottom surface 1023 and the support plane 101 is 3-10 mm. The distance between the highest point a where the outer front top arc surface 131 and the outer rear top arc surface 141 are tangent to the upper bottom surface 1023 is 3-8 mm; the distance between the highest point where the inner front top arc surface 111 and the inner rear top arc surface 121 are tangent to the upper bottom surface 1023 is 3.5-10.5 mm.

[0168] The talar prosthesis body 100 is provided with an inner anchor 210 and an outer anchor 220, both of which are mounted on the front inclined surface 1021, the inner anchor 210 is located at the inner front portion 110, and the outer anchor 220 is located at the outer front portion 130. The inner anchor 210 and the outer anchor 220 have the same structure, the inner anchor 210 includes a columnar portion 211 connected to the talar prosthesis body 100 and a hemispherical portion 212 connected to the bottom of the columnar portion 211; the length of the columnar portion 211 is 2-8 mm, and the length of the hemispherical portion 212 is 2-4 mm. The inner anchor 210 and the outer anchor 220 are inserted into the rear of the talar neck from the front to the back to increase the initial stability of the talar prosthesis body 100 after installation. The design of the installation position can reduce the impact on the blood supply of the talus and reduce the occurrence of talar bone necrosis after the talar prosthesis body 100 is installed.

[0169] In order to make the contour of the talar prosthesis body 100 more consistent with the contour structure of the talus of the ankle joint of Asians, the line formed by the highest point where the medial anterior top arc surface 111 and the medial posterior top arc surface 121 are tangent to the highest point a where the lateral anterior top arc surface 131 and the lateral posterior top arc surface 141 are tangent is the top line, and the plane passing through the top line and perpendicular to the support plane 101 is the top vertical plane. On the top vertical plane, the intersection of the straight line passing through the midpoint of the top line and perpendicular to the support plane 101 and the top surface of the talar prosthesis body 100 is the middle connection point, and the middle connection point is at the intersection of the medial anterior top arc surface 111, the medial posterior top arc surface 121, the lateral anterior top arc surface 131 and the lateral posterior top arc surface 141.

[0170] The distance between the middle connection point and the midpoint of the top vertical plane through the top connection line is 0.5-3.5mm.

[0171] The highest point where the inner front top arc surface 111 and the inner rear top arc surface 121 are tangent is 0.5-2.5 mm higher than the highest point a where the outer front top arc surface 131 and the outer rear top arc surface 141 are tangent.

[0172] The following table shows the specific values ​​of various parameters of the three talar implant products:

[0173]

[0174]

[0175] The tibial component of this embodiment is installed on the right ankle, and the tibial component includes: a tibial prosthesis 3100 and a tibial connecting portion 3200 connected to the tibial prosthesis 3100;

[0176] The tibial prosthesis 3100 is a plate body, and 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 connecting 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. The plate body circumferential side surface 3130 is formed along the contour of the plate body top surface 3110.

[0177] The circumferential side surface 3130 of the plate body includes a front arc surface 3131, a concave arc surface 3133, a rear arc surface 3135 and a vertical side surface 3137 which are connected in sequence. The front arc surface 3131 is arranged opposite to the rear arc surface 3135, and the concave arc surface 3133 is arranged opposite to the vertical side surface 3137.

[0178] The front arc surface 3131 and the rear arc surface 3135 are convex outward, the concave arc surface 3133 is concave inward, the vertical side surface 3137 is a plane perpendicular to the plate bottom surface 3120, and the pad top surface 410 is connected to the plate bottom surface 3120. The plate bottom surface 3120 is used to be installed at the bottom of the tibia 20.

[0179] A convex strip 3121 is disposed on the bottom surface 3120 of the plate body; the top surface 410 of the liner block 400 is a plane, and a slot 430 is disposed on the top surface 410 of the liner block 400 for the convex strip 3121 to be inserted into.

[0180] In this embodiment, there are two convex strips 3121, which are arranged opposite to each other, and the side surface of each convex strip 3121 opposite to the other convex strip 3121 is an inner inclined surface 3122, and the two convex strips 3121 are connected by a reinforcing strip 3123. There are two slots 430 on the inner liner block 400, which are arranged opposite to each other on the edges of the liner block top surface 410 of the inner liner block 400. Each slot 430 has an inner inclined wall surface 431 corresponding to the inner inclined surface 3122 of the convex strip 3121. When the convex strip 3121 is inserted into the corresponding slot 430, the liner block top surface 410 contacts the bottom surface 3120 of the plate body.

[0181] The horizontal osteotomy at the bottom of the tibia 20 is to shave off the required thickness at the bottom of the tibia 20. However, there will be a reserved portion of the bone on the side of the bottom of the tibia 20 away from the fibula 30. The side of the reserved portion close to the fibula 30 is a flat surface, and the bottom surface of the bottom of the tibia 20 after the horizontal osteotomy is also a plane. The vertical side surface 3137 of the circumferential side surface 3130 of the plate body corresponds to the side surface of the reserved portion close to the fibula 30, and the front curved surface 3131 of the circumferential side surface 3130 of the plate body corresponds to the front contour of the bottom surface of the bottom of the tibia 20 after the horizontal osteotomy. The posterior curved surface 3135 of the circumferential side surface 3130 of the plate body corresponds to the posterior contour of the bottom surface of the tibia 20 after horizontal osteotomy, and the concave curved surface 3133 of the circumferential side surface 3130 of the plate body corresponds to the position of the fibula 30, so that the structure of the circumferential side surface 3130 of the plate body can match the contour of the bottom surface of the tibia 20 after horizontal osteotomy; because the concave curved surface 3133 of the circumferential side surface 3130 of the plate body is concave inward, this structure corresponds to the protruding structure on the fibula 30, which can reduce the impact between the prosthesis and the fibula 30 after surgery.

[0182] The front arc surface 3131 and the concave arc surface 3133 are connected via the front concave arc surface 3132, and both the front arc surface 3131 and the concave arc surface 3133 are tangent to the front concave arc surface 3132;

[0183] The rear side arc surface 3135 and the concave arc surface 3133 are connected via the rear concave side arc surface 3134, and both the rear side arc surface 3135 and the concave arc surface 3133 are tangent to the rear concave side arc surface 3134;

[0184] The vertical side surface 3137 and the rear side arc surface 3135 are connected via the rear vertical side arc surface 3136, and both the vertical side surface 3137 and the rear side arc surface 3135 are tangent to the rear vertical side arc surface 3136;

[0185] The front curved surface 3131 and the vertical side surface 3137 are connected via the front vertical curved surface 3138, and the front curved surface 3131 and the vertical side surface 3137 are tangent to the front vertical curved surface 3138;

[0186] Along the direction parallel to the vertical side surface 3137, the tangent point 3141 between the front curved surface 3131 and the front vertical curved surface 3138 is located in front of the tangent point 3142 between the front curved surface 3131 and the front concave curved surface 3132, and the tangent point 3143 between the rear curved surface 3135 and the rear vertical curved surface 3136 is located in front of the tangent point 3144 between the rear curved surface 3135 and the rear concave curved surface 3134.

[0187] Along the direction perpendicular to the vertical side surface 3137 , the tangent point 3144 between the rear curved surface 3135 and the rear concave curved surface 3134 is closer to the vertical side surface 3137 than the tangent point 3142 between the front curved surface 3131 and the front concave curved surface 3132 .

[0188] This structure makes the circumferential side surface 3130 of the plate body surrounded by the anterior curved surface 3131, the anterior concave curved surface 3132, the concave curved surface 3133, the posterior concave curved surface 3134, the posterior curved surface 3135, the posterior vertical curved surface 3136, the vertical side surface 3137 and the anterior vertical curved surface 3138. This makes the structure of the circumferential side surface 3130 of the plate body match the contour of the bottom of the tibia 20 after horizontal osteotomy. At the same time, the structure of the circumferential side surface 3130 of the tibial component of the plate body can maximize the coverage of the contour of the bottom surface of the bottom of the tibia 20 after horizontal osteotomy. In other words, the structure of the circumferential side surface 3130 of the tibial component of the plate body can cover the outer area of ​​the tibia 20 where the bone is harder, which can reduce the incidence of prosthesis subsidence after surgery.

[0189] Along the direction perpendicular to the vertical side surface 3137, the tangent point 3146 between the concave arc surface 3133 and the rear concave arc surface 3134 is closer to the vertical side surface 3137 than the tangent point 3145 between the front concave arc surface 3132 and the concave arc surface 3133, and the tangent point 3146 between the concave arc surface 3133 and the rear concave arc surface 3134. This structure can make the structure of the circumferential side surface 3130 of the plate body of the tibial component at the concave arc surface 3133 more consistent with the structure of the corresponding fibula 30, so as to effectively reduce the impact between the prosthesis and the fibula 30 after surgery.

[0190] The maximum distance between the front curved surface 3131 and the rear curved surface 3135 is in the range of 33-45 mm, and the maximum distance between the vertical side surface 3137 and the front concave curved surface 3132 is in the range of 30-42 mm. This range is consistent with the anatomical structure of the bottom surface of the bottom of the Asian tibia 20 after horizontal osteotomy.

[0191] The distance between the top surface 3110 of the plate and the bottom surface 3120 of the plate is 3-6 mm. The distance between the top surface 3110 of the plate and the bottom surface 3120 of the plate is the thickness of the tibial prosthesis 3100. The thickness range of the tibial prosthesis 3100 can meet the requirements of ankle replacement surgery.

[0192] The radius of the front concave side arc surface 3132 is in the range of 1.5-5.5mm; the radius of the concave arc surface 3133 is in the range of 13.5-19.5mm; the radius of the rear concave side arc surface 3134 is in the range of 2.5-8.5mm; the radius of the rear arc surface 3135 is in the range of 42-50mm; the radius of the rear vertical side arc surface 3136 is in the range of 2.5-6.5mm; the radius of the front vertical side arc surface 3138 is in the range of 2.5-6.5mm; the radius of the front arc surface 3131 is in the range of 52.5-60.5mm; the length of the vertical side surface 3137 in the horizontal direction is 16-30mm. This value range enables the structure of the circumferential side surface 3130 of the plate body of the tibial component to cover the anatomical structure of the harder bone outer region of the tibia 20 of Asians.

[0193] The following table shows the specific values ​​of various parameters of the tibial prosthesis 3100 of the three tibial components:

[0194]

[0195] The tibia connecting part 3200 is a plurality of columns 3210, all of which are inclined relative to the top surface 3110 of the plate body, and all of which have the same inclination direction. All of the columns 3210 are connected to the bottom surface of the bottom of the tibia 20 after horizontal osteotomy.

[0196] The end of each columnar body 3210 away from the tibial prosthesis 3100 is a spherical surface. The structure of the columnar body 3210 is suitable for patients with good bone quality and sufficient bone volume at the distal end of the tibia 20, and the tibial prosthesis 3100 is effectively attached to the distal end of the tibia 20 by tapping. The columnar body 3210 is tilted toward the front side of the tibial prosthesis 3100 to facilitate the connection between the columnar body 3210 and the tibia 20.

[0197] The structure of the present invention avoids collision between the prosthesis and bones or soft tissues, while covering the bone morphology of the distal tibia 20 after osteotomy as much as possible, greatly reducing the incidence of postoperative complications.

[0198] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An artificial ankle joint prosthesis assembly, comprising: A talar implant, a tibial component and an inner liner (400); characterized in that the talar implant is used to be installed on the calcaneus (10), the inner side of the talar implant is closer to the tibia (20) than the outer side of the talar implant, and the front side of the talar implant is closer to the toes than the rear side of the talar implant; The talar implant comprises: a talar prosthesis body (100), wherein the bottom surface of the talar prosthesis body (100) is provided with a support plane (101); The talar prosthesis body (100) comprises a connected inner part and an outer part; the inner part comprises a connected inner front part (110) and an inner rear part (120), and the outer part comprises a connected outer front part (130) and an outer rear part (140); The top surface of the inner front portion (110) is an inner front top arc surface (111), and the top surface of the inner rear portion (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 concave downwards in a direction from inside to outside; The top surface of the outer front portion (130) is an outer front top arc surface (131), and the top surface of the outer rear portion (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 surface (131) and the outer rear top arc surface (141) are both concave downwards in a direction from outside to inside; The lateral side surface of the medial front portion (110) is connected to and coplanar with the medial side surface of the lateral front portion (130), and the lateral side surface of the medial rear portion (120) is connected to and coplanar with the medial side surface of the lateral rear portion (140); the top of the connection between the medial front portion (110) and the lateral front portion (130) forms an anterior recessed seam (150), and the top of the connection between the medial rear portion (120) and the lateral rear portion (140) forms a posterior recessed seam (160); the anterior recessed seam (150) is connected to the posterior recessed seam (160) to form a recessed seam at the top of the talus; The distance between the highest point where the inner front top circular arc surface (111) and the inner rear top circular arc surface (121) are tangent to the support plane (101) is the inner highest tangent point height; the distance between the highest point where the outer front top circular arc surface (131) and the outer rear top circular arc surface (141) are tangent to the support plane (101) is the outer highest tangent point height; the inner highest tangent point height is greater than the outer highest tangent point height; The radius of the inner rear top circular arc surface (121) is greater than the radius of the inner front top circular arc surface (111); the radius of the inner rear top circular arc surface (121) is greater than the radius of the outer front top circular arc surface (131); the radius of the inner rear top circular arc surface (121) is greater than the radius of the outer rear top circular arc surface (141); The inner lining block (400) has a lining block top surface (410) and a lining block bottom surface (420) which are arranged opposite to each other; The liner block bottom surface (420) of the inner liner block (400) contacts the top of the talar prosthesis body (100), and an inner arc-shaped recessed portion (421) and an outer arc-shaped recessed portion (422) are provided on the liner block bottom surface (420) of the inner liner block (400) along the inner and outer directions of the inner liner block (400); the radius of curvature of the inner arc-shaped recessed portion (421) is equal to the radius of the inner rear top circular arc surface (121), and the radius of curvature of the outer arc-shaped recessed portion (422) is equal to the radius of the outer rear top circular arc surface (141); a bottom protruding edge (423) is formed at the intersection of the outer side wall of the inner arc-shaped recessed portion (421) and the inner side wall of the outer arc-shaped recessed portion (422); the bottom protruding edge (423) of the inner liner block (400) is inserted into the recessed groove at the top of the talus and can move along the recessed groove at the top of the talus; The pad top surface (410) is connected to the tibial component, and the tibial component is used to be installed on the bottom of the tibia (20).

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

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

4. The artificial ankle joint prosthesis assembly according to claim 3, characterized in that: Any front plane parallel to the inner and outer directions of the talar prosthesis body (100) and perpendicular to the support plane (101) is a front vertical plane; an intersection line where any one of the front vertical planes intersects with the outer side surface of the inner front part (110) is a front intersection line; along the inner and outer directions of the talar prosthesis body (100), the distance between the front intersection line and the inner side surface (112) of the inner front part (110) is the width of the inner front part (110), and the distance between the front intersection line and the outer side surface (132) of the outer front part (130) is the width of the outer front part (130); Along the front-to-back direction of the talar prosthesis body (100), the width of the medial front portion (110) and the width of the lateral front portion (130) are successively reduced, and on the same front vertical plane, the width of the medial front portion (110) is greater than the width of the lateral front portion (130); Any rear plane parallel to the inner-outer direction of the talar prosthesis body (100) and perpendicular to the support plane (101) is a rear vertical plane; an intersection line of any one of the rear vertical planes and the outer side surface of the inner rear portion (120) is a rear intersection line; along the inner-outer direction of the talar prosthesis body (100), the distance between the rear intersection line and the inner side surface (122) of the inner rear portion (120) is the width of the inner rear portion (120), and the distance between the rear intersection line and the outer side surface (142) of the outer rear portion (140) is the width of the outer rear portion (140); Along the front-to-back direction of the talar prosthesis body (100), the width of the medial rear portion (120) and the width of the lateral rear portion (140) both decrease successively, and on the same rear vertical plane, the width of the medial rear portion (120) is greater than the width of the lateral rear portion (140).

5. The artificial ankle joint prosthesis assembly according to claim 3, characterized in that: The front side edge (113) of the inner front portion (110) is a circular arc line that is concave backwards; the rear side edge (123) of the inner rear portion (120) is a circular arc line that is concave forwards; the front side edge (133) of the outer front portion (130) is a circular arc line that is concave backwards; and the rear side edge (143) of the outer rear portion (140) is a circular arc line that is concave forwards.

6. The artificial ankle joint prosthesis assembly according to claim 5, characterized in that: A first inner front rounded corner portion (114) is provided at the intersection of the inner front top arc surface (111) and the inner side surface (112) of the inner front portion (110); the front side edge of the first inner front rounded corner portion (114) is an arc edge; A first inner rear rounded corner portion (124) is provided at the intersection of the inner rear top arc surface (121) and the inner side surface (122) of the inner rear portion (120); the rear side edge of the first inner rear rounded corner portion (124) is an arc edge; A first outer front rounded corner portion (134) is provided at the intersection of the outer front top arc surface (131) and the outer side surface (132) of the outer front portion (130); the front side edge of the first outer front rounded corner portion (134) is an arc edge; A first outer rear rounded corner portion (144) is provided at the intersection of the outer rear top arc surface (141) and the outer side surface (142) of the outer rear portion (140); the rear side edge of the first outer rear rounded corner portion (144) is an arc edge.

7. The artificial ankle joint prosthesis assembly according to claim 6, characterized in that: The front side edge of the first inner front rounded corner portion (114) is tangent to the front side edge (113) of the inner front portion (110); the rear side edge of the first inner rear rounded corner portion (124) is tangent to the rear side edge (123) of the inner rear portion (120); the front side edge of the first outer front rounded corner portion (134) is tangent to the front side edge (133) of the outer front portion (130); and the rear side edge of the first outer rear rounded corner portion (144) is tangent to the rear side edge (143) of the outer rear portion (140).

8. The artificial ankle joint prosthesis assembly according to claim 7, characterized in that: The bottom surface of the talar prosthesis body (100) is also provided with a notch (102), and the notch (102) passes through 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, characterized in that: The cross section of the recess (102) is a trapezoidal cross section; the recess (102) has a front inclined surface (1021) and a rear inclined surface (1022) that are opposite to each other, the front inclined surface (1021) is located 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 support plane (101).

10. The artificial ankle joint prosthesis assembly according to claim 9, characterized in that: The talar prosthesis body (100) is provided with an inner anchor (210) and an outer anchor (220), and both the inner anchor (210) and the outer anchor (220) are installed on the front inclined surface (1021), the inner anchor (210) is located at the inner front part (110), and the outer anchor (220) is located at the outer front part (130).

11. The artificial ankle joint prosthesis assembly according to claim 1, characterized in that: The tibial component comprises: 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 comprises a front arc surface (3131), a concave arc surface (3133), a rear arc surface (3135) and a vertical side surface (3137) connected in sequence, the front arc surface (3131) and the rear arc surface (3135) are arranged opposite to each other, and the concave arc surface (3133) and the vertical side surface (3137) are arranged opposite to each other; the front arc surface (3131) and the rear arc surface (3135) are convex outwards, the concave arc surface (3133) is concave inwards, and the vertical side surface (3137) is a plane perpendicular to the bottom surface (3120) of the plate body; The pad top surface (410) is connected to the plate bottom surface (3120).

12. The artificial ankle joint prosthesis assembly according to claim 11, characterized in that: The front curved surface (3131) and the concave curved surface (3133) are connected via a front concave curved surface (3132), and both the front curved surface (3131) and the concave curved surface (3133) are tangent to the front concave curved surface (3132); The rear side arcuate surface (3135) and the concave arcuate surface (3133) are connected via a rear concave side arcuate surface (3134), and both the rear side arcuate surface (3135) and the concave arcuate surface (3133) are tangent to the rear concave side arcuate surface (3134); The vertical side surface (3137) and the rear curved surface (3135) are connected via a rear vertical side curved surface (3136), and both the vertical side surface (3137) and the rear curved surface (3135) are tangent to the rear vertical side curved surface (3136); The front curved surface (3131) and the vertical side surface (3137) are connected via a front vertical curved surface (3138), and both the front curved surface (3131) and the vertical side surface (3137) are tangent to the front vertical curved surface (3138); Along the direction parallel to the vertical side surface (3137), the tangent point (3141) between the front curved surface (3131) and the front vertical curved surface (3138) is located in front of the tangent point (3142) between the front curved surface (3131) and the front concave curved surface (3132), and the tangent point (3143) between the rear curved surface (3135) and the rear vertical curved surface (3136) is located in front of the tangent point (3144) between the rear curved surface (3135) and the rear concave curved surface (3134); Along the direction perpendicular to the vertical side surface (3137), the tangent point (3144) between the rear curved surface (3135) and the rear concave curved surface (3134) is closer to the vertical side surface (3137) than the tangent point (3142) between the front curved surface (3131) and the front concave curved surface (3132).

13. The artificial ankle joint prosthesis assembly according to claim 12, characterized in that: Along the direction perpendicular to the vertical side surface (3137), the tangent point (3146) between the concave curved surface (3133) and the rear concave side curved surface (3134) is closer to the vertical side surface (3137) than the tangent point (3145) between the front concave side curved surface (3132) and the concave curved surface (3133), the tangent point (3146) between the concave curved surface (3133) and the rear concave side curved surface (3134).

14. The artificial ankle joint prosthesis assembly according to claim 11, characterized in that: The tibial connecting portion (3200) is composed of a plurality of columnar bodies (3210), all of which are arranged to be inclined relative to the top surface (3110) of the plate body, and the inclination directions of all of which are the same.

15. The artificial ankle joint prosthesis assembly according to claim 11, characterized in that: The bottom surface (3120) of the plate body is provided with a convex strip (3121); The liner block top surface (410) of the inner liner block (400) is a plane, and a slot (430) for the convex strip (3121) to be inserted is provided on the liner block top surface (410) of the inner liner block (400).

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