Ankle joint prosthesis

Abstract

The present application provides a kind of ankle joint prosthesis, comprising: tibial prosthesis;Talus prosthesis, with tibial prosthesis sliding fit, talus prosthesis includes talus body and buffer pad, buffer pad is in contact with tibial prosthesis, talus body is provided with multiple hole parts to the side of tibial prosthesis, multiple hole parts are arranged in array, buffer pad includes pad body and multiple plug-in parts, multiple plug-in parts and pad body are connected, multiple plug-in parts and multiple hole parts are set up one by one, plug-in part is inserted into corresponding hole part, pad body and multiple plug-in parts are configured to be able to produce elastic deformation under pressure state.The technical scheme of the present application effectively solves the problem that the ankle joint prosthesis in the related art is difficult to realize the mechanical environment of physiological state.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an ankle joint prosthesis. Background Technology

[0002] The ankle joint, formed by the talus, distal tibia, and distal fibula, is the joint in the human body that bears the greatest load. Its lesions often lead to walking difficulties and, in severe cases, disability. Total ankle replacement is one of the important treatment methods for restoring the structure and function of the ankle joint. Its prosthetic system mainly includes tibial prostheses and talar prostheses. The tibial prosthesis is specifically used to replace the diseased distal tibia to restore ankle joint function.

[0003] In related technologies, the tibial prosthesis and the talus prosthesis are in rigid contact, which makes it difficult to achieve a physiological mechanical environment, thus affecting the patient's experience. Summary of the Invention

[0004] The main objective of this invention is to provide an ankle joint prosthesis to solve the problem that ankle joint prostheses in related technologies are difficult to achieve the biomechanical environment of a physiological state.

[0005] To achieve the above objectives, the present invention provides an ankle joint prosthesis, comprising: a tibial prosthesis; and a talus prosthesis, which slides in conjunction with the tibial prosthesis. The talus prosthesis includes a talus body and a cushioning pad, which contacts and engages with the tibial prosthesis. The talus body has a plurality of holes on the side facing the tibial prosthesis, arranged in an array. The cushioning pad includes a pad body and a plurality of insertion parts, which are connected to the pad body. The insertion parts and the holes are arranged in a one-to-one correspondence, with the insertion parts inserted into the corresponding holes. The pad body and the insertion parts are configured to undergo elastic deformation under pressure.

[0006] Furthermore, the talus body also includes a connecting hole, with at least one connecting hole provided between any two adjacent holes.

[0007] Furthermore, some of the plug-in parts are located inside the connecting holes, and the holes are hexagonal holes. Connecting holes are provided on the common hole walls of any two adjacent hexagonal holes.

[0008] Furthermore, the talus body has an arcuate surface, a first end face, and a second end face. The arcuate surface includes a first arcuate side and a second arcuate side disposed opposite to each other, as well as a first connecting side and a second connecting side disposed between the first arcuate side and the second arcuate side. The first end face is disposed at the first arcuate side, and the second end face is disposed at the second arcuate side. Holes are disposed on the arcuate surface. The depth of the multiple holes gradually decreases from the center of the arcuate surface to the first connecting side, and the depth of the multiple holes gradually decreases from the center of the arcuate surface to the second connecting side.

[0009] Furthermore, the talus body is made of metal, and the cushioning pad is made of polyurethane.

[0010] Furthermore, the tibial prosthesis includes a tibial body and a first limiting portion, the first limiting portion being movably disposed on the tibial body, and the first limiting portion being able to protrude toward the side away from the talus prosthesis.

[0011] Furthermore, the side of the tibia body is provided with a mounting recess. The first limiting part includes a limiting plate, an arc-shaped rack, and a backstop. The arc-shaped rack is driven to cooperate with the limiting plate, and the backstop is movably connected to the limiting plate. The first limiting part also includes an operating tooth, which is rotatably disposed on the tibia body and cooperates with the arc-shaped rack. The backstop is located in the mounting recess and cooperates with the tibia body to prevent backflow.

[0012] Furthermore, the tibia body is provided with an installation groove, which is located on the side wall of the installation recess. The installation groove is provided with multiple first protruding teeth, and the anti-reverse member is provided with multiple second protruding teeth. The anti-reverse member is inserted into the installation groove, and the first protruding teeth and second protruding teeth stop and cooperate.

[0013] Furthermore, a guide hole is provided on the tibia body, an arc-shaped toothed rack is inserted into the guide hole, the anti-reverse component includes a rod body, multiple second protrusions are provided on the rod body, the arc-shaped toothed rack is connected to the top of the limiting plate, and the rod body is hinged to the bottom of the limiting plate.

[0014] Furthermore, the first protruding tooth includes a first stop surface and a first inclined surface. In the direction from the tibial prosthesis to the talus prosthesis, the first stop surface is located above the first inclined surface, and the first inclined surface is extended outward. The second protruding tooth includes a second stop surface and a second inclined surface. In the direction from the tibial prosthesis to the talus prosthesis, the second inclined surface is located above the second stop surface, and the second inclined surface is extended outward. The first stop surface and the second stop surface stop and cooperate.

[0015] Furthermore, the tibial prosthesis also includes a second limiting part, with the first limiting part and the second limiting part respectively located on opposite sides of the tibial body.

[0016] Furthermore, the tibial prosthesis also includes a connecting post, which is detachably connected to the tibial body.

[0017] Furthermore, the connecting post includes an end head, multiple solid parts and multiple porous parts, the multiple solid parts are arranged circumferentially at intervals along the end head, and at least one solid part is arranged between any two adjacent porous parts.

[0018] Applying the technical solution of this invention, the talus prosthesis and the tibia prosthesis slide together. The talus prosthesis includes a talus body and a buffer pad, which contacts the tibia prosthesis. The talus body has multiple holes, and the buffer pad includes a pad body and multiple insertion parts. The insertion parts and holes are arranged in a one-to-one correspondence, with the insertion parts inserted into the corresponding holes. The pad body and insertion parts are configured to elastically deform under pressure. Through this configuration, because the buffer pad can elastically deform, when the tibia prosthesis and the talus prosthesis are in contact with force, the tibia prosthesis can compress the pad body and transmit the force to the holes through the insertion parts. This achieves a better buffering effect; when the pad body is compressed, the force is transmitted to the insertion parts, causing the insertion parts to deform and thus improving the buffering effect. Furthermore, the cooperation between the insertion parts and the holes improves the connection stability between the buffer pad and the talus body, preventing separation between them. Therefore, the technical solution of this application effectively solves the problem of ankle joint prostheses in related technologies failing to achieve a physiological mechanical environment. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 A three-dimensional structural schematic diagram of an embodiment of an ankle joint prosthesis according to the present invention is shown;

[0021] Figure 2 It shows Figure 1 A schematic diagram of the exploded structure of an ankle joint prosthesis;

[0022] Figure 3 It shows Figure 1 A three-dimensional structural diagram of the cushioning pad of an ankle joint prosthesis;

[0023] Figure 4 It shows Figure 3 A bottom view of the cushioning pad;

[0024] Figure 5 It shows Figure 1 A three-dimensional structural diagram of the talus body of the ankle joint prosthesis;

[0025] Figure 6 It shows Figure 5 A three-dimensional structural diagram of the talus body from another perspective;

[0026] Figure 7 It shows Figure 5 A top view of the talus body;

[0027] Figure 8 It shows Figure 1 A three-dimensional structural diagram of the tibial prosthesis for ankle joint prostheses;

[0028] Figure 9 It shows Figure 8 A side view of the tibial prosthesis;

[0029] Figure 10 It shows Figure 8 A three-dimensional structural diagram of a local structure of a tibial prosthesis;

[0030] Figure 11 It shows Figure 10 A magnified view of part A of the tibial prosthesis;

[0031] Figure 12 It shows Figure 8 A three-dimensional structural diagram of the first limiting part of the tibial prosthesis;

[0032] Figure 13 It shows Figure 12 A three-dimensional structural diagram of the anti-reverse component of the first limiting part;

[0033] Figure 14 It shows Figure 8 A top view of the tibial body of the tibial prosthesis;

[0034] Figure 15 It shows Figure 14 A schematic diagram of the BB-direction cross-section of the tibia.

[0035] Figure 16 It shows Figure 14 A schematic diagram of the CC-direction cross-section of the tibia.

[0036] The above figures include the following reference numerals:

[0037] 10. Tibial prosthesis; 11. Tibial body; 111. Mounting recess; 112. Mounting groove; 113. First protruding tooth; 1131. First stop surface; 1132. First inclined surface; 114. Guide hole; 12. First limiting part; 121. Limiting plate; 122. Arc-shaped rack; 123. Anti-reverse component; 1231. Second protruding tooth; 12311. Second stop surface; 12312. Second inclined surface; 1232. Rod; 124. Operating tooth; 13. Second limiting part 14. Connecting post; 141. End head; 142. Solid part; 143. Porous part; 20. Talus prosthesis; 21. Talus body; 211. Hole; 212. Connecting hole; 213. Arc-shaped surface; 2131. First arc-shaped side; 2132. Second arc-shaped side; 2133. First connecting side; 2134. Second connecting side; 214. First end face; 215. Second end face; 22. Buffer pad; 221. Pad body; 222. Insertion part. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] like Figure 1 and Figure 2As shown, in some embodiments, the ankle joint prosthesis includes a tibial prosthesis 10 and a talus prosthesis 20. The talus prosthesis 20 slides with the tibial prosthesis 10. The talus prosthesis 20 includes a talus body 21 and a cushioning pad 22. The cushioning pad 22 contacts and engages with the tibial prosthesis 10. The talus body 21 has a plurality of holes 211 on the side facing the tibial prosthesis 10. The plurality of holes 211 are arranged in an array. The cushioning pad 22 includes a pad body 221 and a plurality of insertion portions 222. The plurality of insertion portions 222 are connected to the pad body 221. The plurality of insertion portions 222 and the plurality of holes 211 are arranged in a one-to-one correspondence. The insertion portions 222 are inserted into the corresponding holes 211. The pad body 221 and the plurality of insertion portions 222 are configured to produce elastic deformation under pressure.

[0042] Using the above-described technical solution, the talus prosthesis 20 and the tibial prosthesis 10 slide together. The talus prosthesis 20 includes a talus body 21 and a buffer pad 22. The buffer pad 22 contacts the tibial prosthesis 10. The talus body 21 is provided with a plurality of holes 211. The buffer pad 22 includes a pad body 221 and a plurality of insertion parts 222. The plurality of insertion parts 222 and the plurality of holes 211 are provided in a one-to-one correspondence. The insertion parts 222 are inserted into the corresponding holes 211. The pad body 221 and the insertion parts 222 are configured to be able to generate elastic deformation under pressure. With the above-described configuration, the cushioning pad 22 can elastically deform. When the tibial prosthesis 10 and the talus prosthesis 20 are in contact under force, the tibial prosthesis 10 can compress the pad body 221 and transmit the force through the insertion portion 222 to the hole portion 211. This achieves a better cushioning effect; when the pad body 221 is compressed, the force is transmitted to the insertion portion 222, causing the insertion portion 222 to deform and thus improving the cushioning effect. Furthermore, the cooperation between the insertion portion 222 and the hole portion 211 improves the connection stability between the cushioning pad 22 and the talus body 21, preventing separation between them. Therefore, the above technical solution effectively solves the problem of ankle joint prostheses failing to achieve a physiological mechanical environment in related technologies.

[0043] like Figures 2 to 7 As shown, in some embodiments, the talus body 21 further includes a connecting hole 212, with at least one connecting hole 212 provided between any two adjacent holes 211. The connecting hole 212 allows the insertion part 222 to enter into the connecting hole 212 when under force, thus increasing the deformation space of the buffer pad 22 and improving its cushioning effect. In other words, the connecting hole 212 allows for the regulation of pressure, preventing excessive force on the insertion part 222 in a single area.

[0044] Specifically, the connecting hole 212 is located at the bottom of the hole portion 211. The ratio of the area of ​​a single connecting hole 212 to the area of ​​a single hole portion 211 is less than 0.3.

[0045] The technical solution of this embodiment enables multiple insertion parts 222 to achieve regional linkage through the cooperation of the connecting hole 212 and the hole portion 211, thereby achieving dynamic lateral stability. Furthermore, due to the elastic buffer design, force can be dispersed, thus reducing wear and increasing the service life of the ankle joint prosthesis.

[0046] like Figures 2 to 7 As shown, in some embodiments, a portion of the plug-in part 222 is disposed within the communicating hole 212. The hole 211 is a hexagonal hole, and a communicating hole 212 is disposed on the common hole wall of any two adjacent hexagonal holes. The above arrangement enables the transmission of force, that is, when any plug-in part 222 is subjected to excessive force, it can be transmitted to other plug-in parts 222 through the plug-in part 222 within the communicating hole 212. This ensures the buffering effect on the one hand, and avoids excessive deformation of the buffer pad 22, which would affect the performance of the device on the other hand.

[0047] The hexagonal structure allows for seamless coverage and maximizes mechanical transfer efficiency. The area of ​​each hexagonal hole is typically set at 4mm². 2 Up to 9mm 2 Between adjacent hexagonal holes, the wall thickness ranges from 0.2 mm to 0.5 mm. This dimension ensures sufficient hole density for a smooth mechanical transition while maintaining structural strength.

[0048] like Figures 5 to 7 As shown, in some embodiments, the talus body 21 has an arcuate surface 213, a first end face 214, and a second end face 215. The arcuate surface 213 includes a first arcuate side 2131 and a second arcuate side 2132 disposed opposite to each other, and a first connecting side 2133 and a second connecting side 2134 disposed between the first arcuate side 2131 and the second arcuate side 2132. The first end face 214 is disposed at the first arcuate side 2131, and the second end face 215 is disposed at the second arcuate side 2132. Holes 211 are disposed on the arcuate surface 213. The depth of the plurality of holes 211 gradually decreases from the center of the arcuate surface 213 to the first connecting side 2133, and the depth of the plurality of holes 211 gradually decreases from the center of the arcuate surface 213 to the second connecting side 2134. The above-mentioned arrangement can ensure the buffering effect, that is, the central area of ​​the arc surface 213 is usually the area with the greatest force, the hole 211 in this area has the greatest depth, and the plug 222 is inserted into the hole 211 and extends to the bottom of the hole 211. This can ensure the support effect of the plug 222 and the deformation effect of the buffer pad 22.

[0049] Specifically, such as Figure 5 and Figure 6As shown, in this embodiment, a support column is provided in the hole 211 in the middle region of the arc-shaped surface 213. The support column is embedded in the insertion part 222 to limit its excessive deformation and avoid plastic fatigue or structural failure of the polyurethane material due to excessive strain. When the joint surface is compressed, the insertion part 222 deforms. Due to the influence of the support column, the deformation of the insertion part 222 can be controlled, and the elastic deformation can be transformed into rigid support, thereby protecting the safety of the ankle joint prosthesis.

[0050] The connecting hole 212 is located between the top and bottom of the support column, which reduces the force transmitted to other holes 211, thereby preventing the insertion part 222 in other holes 211 from exerting too much force on the pad body 221, which would cause the relative position between the tibial prosthesis 10 and the talus prosthesis 20 to become unstable.

[0051] like Figures 1 to 7 As shown, in some embodiments, the talus body 21 is made of metal, and the cushioning pad 22 is made of polyurethane. The material of the talus body 21 ensures sufficient strength. The polyurethane material allows for elastic deformation while maintaining sufficient strength. Furthermore, polyurethane has good wear resistance, preventing excessive wear after long-term use.

[0052] Specifically, the material of the talus body 21 can be nickel-titanium alloy, and the Shore hardness of the polyurethane is between 60A and 100A.

[0053] like Figure 2 As shown, the talus prosthesis 20 also includes a first positioning post and a second positioning post. The first and second positioning posts are spaced apart on the side of the talus body 21 away from the tibial prosthesis 10. The side of the first positioning post away from the talus body 21 is solid, and the side of the first positioning post facing the talus body 21 is also solid. The central region of the first positioning post has a porous structure, and the interior of the first positioning post has a hollow structure. The second positioning post has the same structure as the first positioning post. The first and second positioning posts are connected to the talus body 21 through a threaded structure.

[0054] like Figure 8 and Figure 9 As shown, in some embodiments, the tibial prosthesis 10 includes a tibial body 11 and a first limiting portion 12. The first limiting portion 12 is movably disposed on the tibial body 11 and can protrude toward the side away from the talus prosthesis 20. The aforementioned first limiting portion 12 can limit the tibia of the human body, thereby making the relative position of the human tibia and the tibial prosthesis 10 more stable.

[0055] like Figure 8 and Figure 10As shown, in some embodiments, the tibia body 11 has a mounting recess 111 on its side. The first limiting part 12 includes a limiting plate 121, an arc-shaped rack 122, and a stop member 123. The arc-shaped rack 122 is driven to engage with the limiting plate 121, and the stop member 123 is movably connected to the limiting plate 121. The first limiting part 12 also includes an operating tooth 124, which is rotatably disposed on the tibia body 11 and engages with the arc-shaped rack 122. The stop member 123 is located in the mounting recess 111 and engages with the tibia body 11. The operating tooth 124 can drive the arc-shaped rack 122 to move, thereby causing the limiting plate 121 to extend out of the tibia body 11, thus achieving the limiting of the human tibia. Furthermore, the mounting recess 111 can accommodate the limiting plate 121, thus preventing the limiting plate 121 from protruding outward from the tibia body 11, and thus preventing the ankle joint prosthesis from occupying too much space. Meanwhile, when the limit plate 121 is adjusted to the position by the operating tooth 124, the setting of the anti-retraction component 123 can prevent the limit plate 121 from retracting, thereby making the position of the limit plate 121 more stable.

[0056] Specifically, the operating tooth 124 is a gear rod. The tibia body 11 is provided with a mounting hole, the side of which is connected to the mounting recess 111. The operating tooth 124 is rotatably disposed in the mounting hole. The guide hole 114 is adjacent to and connected to the mounting hole, which makes the position of the operating tooth 124 more stable and enables it to drive the arc-shaped rack 122.

[0057] like Figure 8 as well as Figures 10 to 13 As shown, in some embodiments, the tibia body 11 is provided with a mounting groove 112, which is located on the side wall of the mounting recess 111. The mounting groove 112 has a plurality of first protruding teeth 113, and the anti-retraction member 123 has a plurality of second protruding teeth 1231. The anti-retraction member 123 is inserted into the mounting groove 112, and the first protruding teeth 113 and second protruding teeth 1231 engage in a stop-locking action. The engagement of the first protruding teeth 113 and second protruding teeth 1231 achieves a stop-locking action, thereby preventing the limiting plate 121 from retracting.

[0058] like Figures 14 to 16 As shown, in some embodiments, a guide hole 114 is provided on the tibia body 11, and an arc-shaped rack 122 is inserted into the guide hole 114. The anti-retraction member 123 includes a rod 1232, and a plurality of second protruding teeth 1231 are provided on the rod 1232. The arc-shaped rack 122 is connected to the top of the limiting plate 121, and the rod 1232 is hinged to the bottom of the limiting plate 121. At least a portion of the arc-shaped rack 122 is inserted into the guide hole 114 and can move outward from the guide hole 114 under the action of the operating teeth 124. The rod 1232 can be inserted into the mounting groove 112, which makes the position of the anti-retraction member 123 more stable.

[0059] Since the arc-shaped rack 122 is arc-shaped, the rod 1232 is hinged to the bottom of the limiting plate 121. This prevents the rod 1232 and the mounting groove 112 from getting stuck when the operating tooth 124 drives the arc-shaped rack 122 to move.

[0060] It should also be noted that the first limiting part 12 has a small range of movement, that is, the movement of the arc rack 122 driven by the operating tooth 124 is small, which can further avoid jamming.

[0061] Specifically, the arc-shaped rack 122 is connected to the top of the limiting plate 121, and the rod 1232 is hinged to the bottom of the limiting plate 121. This avoids interference between the arc-shaped rack 122 and the rod 1232, thereby ensuring the driving effect.

[0062] The limiting plate 121 is arc-shaped. When the limiting plate 121 moves outward away from the tibial body 11, the top of the limiting plate 121 is located within the range of the upper surface of the tibial body 11.

[0063] like Figures 10 to 13 As shown, in some embodiments, the first protruding tooth 113 includes a first stop surface 1131 and a first inclined surface 1132. In the direction from the tibial prosthesis 10 to the talus prosthesis 20, the first stop surface 1131 is located above the first inclined surface 1132, and the first inclined surface 1132 is outwardly oriented. The second protruding tooth 1231 includes a second stop surface 12311 and a second inclined surface 12312. In the direction from the tibial prosthesis 10 to the talus prosthesis 20, the second inclined surface 12312 is located above the second stop surface 12311, and the second inclined surface 12312 is outwardly oriented. The first stop surface 1131 and the second stop surface 12311 engage in a stop-locking engagement. The aforementioned first inclined surface 1132 and second inclined surface 12312 can achieve a guiding engagement, thereby making it easier for the anti-reverse member 123 to move upward. The first stop surface 1131 and the second stop surface 12311 can achieve a stop-locking engagement, thus preventing the anti-reverse member 123 from moving downward.

[0064] It should be noted that when the anti-reverse member 123 moves upward, the first inclined surface 1132 and the second inclined surface 12312 press against each other, and the anti-reverse member 123 can undergo a certain elastic deformation, which enables the anti-reverse member 123 to move upward.

[0065] like Figures 8 to 10 As shown, in some embodiments, the tibial prosthesis 10 further includes a second limiting portion 13, with the first limiting portion 12 and the second limiting portion 13 respectively disposed on opposite sides of the tibial body 11. The second limiting portion 13 cooperates with the first limiting portion 12 to jointly fix the human tibia.

[0066] Specifically, the structure of the second limiting part 13 is the same as that of the first limiting part 12.

[0067] like Figure 8 and Figure 9 As shown, in some embodiments, the tibial prosthesis 10 further includes a connecting post 14, which is detachably connected to the tibial body 11. The connecting post 14 is inserted into the medullary canal, thereby providing greater stability to the position of the tibial prosthesis 10. The detachable connection between the connecting post 14 and the tibial body 11 allows for easy replacement during subsequent revision procedures; simply separate the tibial body 11 from the connecting post 14 and replace it with a new tibial body 11.

[0068] Specifically, the connecting post 14 and the tibia body 11 are connected by a threaded connection or a snap-fit ​​connection.

[0069] In this embodiment, the connecting post 14 and the tibia body 11 are connected by a snap-fit ​​connection. A cavity is provided on the top surface of the tibia body 11, and a locking platform structure is provided at the bottom of the cavity. A locking slot is provided on the connecting post 14, and the locking slot can engage with the locking platform structure.

[0070] The upper surface of the tibia body 11 is provided with a porous structure.

[0071] like Figure 8 and Figure 9 As shown, in some embodiments, the connecting post 14 includes a head 141, a plurality of solid portions 142, and a plurality of porous portions 143. The plurality of solid portions 142 are arranged circumferentially spaced along the head 141, and at least one solid portion 142 is disposed between any two adjacent porous portions 143. The above arrangement can make the connecting post 14 have good structural strength and enable it to achieve biological fixation with the human tibia.

[0072] Specifically, the interior of the connecting column 14 is a hollow structure, which allows the human tibia to grow into the hollow structure through the porous part 143.

[0073] The tibia body 11 has an arcuate articular surface on the side facing the talus prosthesis 20, which contacts and engages with the buffer pad 22. The arcuate articular surface is treated with a ceramic coating or an ultra-wear-resistant coating.

[0074] In the description of this invention, it should be understood that "a plurality of" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0075] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0076] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ankle joint prosthesis, characterized in that, include: Tibial prosthesis (10); A talus prosthesis (20) slides in conjunction with the tibial prosthesis (10). The talus prosthesis (20) includes a talus body (21) and a buffer pad (22). The buffer pad (22) contacts and engages with the tibial prosthesis (10). The talus body (21) has a plurality of holes (211) on the side facing the tibial prosthesis (10). The plurality of holes (211) are arranged in an array. The buffer pad (22) includes a pad body (221) and a plurality of insertion parts (222). The plurality of insertion parts (222) are connected to the pad body (221). The plurality of insertion parts (222) and the plurality of holes (211) are arranged in a one-to-one correspondence. The insertion part (222) is inserted into the corresponding hole (211). The pad body (221) and the plurality of insertion parts (222) are configured to generate elastic deformation under pressure.

2. The ankle joint prosthesis according to claim 1, characterized in that, The talus body (21) also includes a connecting hole (212), and at least one connecting hole (212) is provided between any two adjacent holes (211).

3. The ankle joint prosthesis according to claim 2, characterized in that, Part of the plug-in portion (222) is disposed in the communicating hole (212), the hole portion (211) is a hexagonal hole, and the communicating hole (212) is disposed on the common hole wall of any two adjacent hexagonal holes.

4. The ankle joint prosthesis according to claim 1, characterized in that, The talus body (21) has an arcuate surface (213), a first end face (214), and a second end face (215). The arcuate surface (213) includes a first arcuate side (2131) and a second arcuate side (2132) disposed opposite to each other, and a first connecting side (2133) and a second connecting side (2134) disposed between the first arcuate side (2131) and the second arcuate side (2132). The first end face (214) is disposed on the first arcuate side. At edge (2131), the second end face (215) is disposed at the second arc-shaped side (2132), and the hole (211) is disposed on the arc-shaped surface (213). In the direction from the center of the arc-shaped surface (213) to the first connecting side (2133), the depth of the plurality of holes (211) gradually decreases. In the direction from the center of the arc-shaped surface (213) to the second connecting side (2134), the depth of the plurality of holes (211) gradually decreases.

5. The ankle joint prosthesis according to claim 1, characterized in that, The talus body (21) is made of metal, and the cushioning pad (22) is made of polyurethane.

6. The ankle joint prosthesis according to claim 1, characterized in that, The tibial prosthesis (10) includes a tibial body (11) and a first limiting part (12), the first limiting part (12) being movably disposed on the tibial body (11) and capable of protruding toward the side away from the talus prosthesis (20).

7. The ankle joint prosthesis according to claim 6, characterized in that, The tibia body (11) has a mounting recess (111) on its side. The first limiting part (12) includes a limiting plate (121), an arc-shaped rack (122), and a stop member (123). The arc-shaped rack (122) is driven to cooperate with the limiting plate (121). The stop member (123) is movably connected to the limiting plate (121). The first limiting part (12) also includes an operating tooth (124). The operating tooth (124) is rotatably disposed on the tibia body (11) and cooperates with the arc-shaped rack (122). The stop member (123) is located in the mounting recess (111) and cooperates with the tibia body (11) to prevent retraction.

8. The ankle joint prosthesis according to claim 7, characterized in that, The tibia body (11) is provided with a mounting groove (112), which is located on the side wall of the mounting recess (111). The mounting groove (112) is provided with a plurality of first protrusions (113), and the anti-retraction member (123) is provided with a plurality of second protrusions (1231). The anti-retraction member (123) is inserted into the mounting groove (112), and the first protrusions (113) and the second protrusions (1231) cooperate to stop each other.

9. The ankle joint prosthesis according to claim 8, characterized in that, The tibia body (11) is provided with a guide hole (114), the arc-shaped rack (122) is inserted into the guide hole (114), the anti-retraction member (123) includes a rod (1232), a plurality of second protrusions (1231) are provided on the rod (1232), the arc-shaped rack (122) is connected to the top of the limiting plate (121), and the rod (1232) is hinged to the bottom of the limiting plate (121).

10. The ankle joint prosthesis according to claim 8, characterized in that, The first protruding tooth (113) includes a first stop surface (1131) and a first inclined surface (1132). In the direction from the tibial prosthesis (10) to the talus prosthesis (20), the first stop surface (1131) is located above the first inclined surface (1132), and the first inclined surface (1132) is extended outward. The second protruding tooth (1231) includes a second stop surface (12311) and a second inclined surface (12312). In the direction from the tibial prosthesis (10) to the talus prosthesis (20), the second inclined surface (12312) is located above the second stop surface (12311), and the second inclined surface (12312) is extended outward. The first stop surface (1131) and the second stop surface (12311) stop and cooperate.

11. The ankle joint prosthesis according to claim 6, characterized in that, The tibial prosthesis (10) further includes a second limiting part (13), and the first limiting part (12) and the second limiting part (13) are respectively disposed on opposite sides of the tibial body (11).

12. The ankle joint prosthesis according to claim 6, characterized in that, The tibial prosthesis (10) also includes a connecting post (14) which is detachably connected to the tibial body (11).

13. The ankle joint prosthesis according to claim 12, characterized in that, The connecting post (14) includes an end head (141), a plurality of solid parts (142) and a plurality of porous parts (143). The plurality of solid parts (142) are arranged circumferentially at intervals along the end head (141), and at least one solid part (142) is arranged between any two adjacent porous parts (143).

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