Ankle joint prosthesis

Abstract

The application discloses a kind of ankle joint prosthesis, including tibial component, gasket and talus component.The tibial component is located outermost, is formed by pedestal, support plate and central screw.The upper part of pedestal is fixed handle, and the lower part is provided with hollow ball socket with sawtooth;Support plate is solid hemisphere, and the surface is provided with sawtooth with the meshing of sawtooth on the pedestal, can realize angle adjustment, and is fixed by central screw, the fixation of support plate and pedestal.Cylindrical gasket, upper part is connected with support plate by protrusion, protrusion is provided with recess matched with central screw, surface is provided with groove and micropore, bottom is circular arc recess, for connecting talus component.Gasket is also fixed with support plate by connecting rod, and the overall structure can realize stable joint connection and angle adjustment.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a foot and ankle joint prosthesis. Background Technology

[0002] With an aging population and an increase in sports injuries, the incidence of end-stage ankle diseases, such as severe osteoarthritis, traumatic arthritis, and rheumatoid arthritis, is rising year by year. For patients who do not respond to conservative treatment, total ankle replacement surgery has become an important alternative to traditional ankle fusion surgery. Its advantage lies in its ability to effectively relieve pain while preserving joint function to the greatest extent possible, thus improving patients' gait and quality of life.

[0003] Artificial ankle joint prostheses typically consist of three core components: a tibial component fixed to the distal tibia, a talar component fixed to the top of the talus, and a spacer positioned between the two to act as a buffer and sliding interface. The long-term survival rate and postoperative function of the prosthesis are highly dependent on precise prosthesis alignment, good force alignment, and stable mechanical bonding between the components.

[0004] However, existing ankle prosthetic systems still face the following challenges in practical applications:

[0005] Limitations of Angle Adjustment and Inaccurate Alignment: Patients have individual differences in their anatomy, and the ideal alignment angles of the ankle joint during surgery (such as inversion / valgus and anteversion / posterior tilt angles) need to be precisely set according to the specific situation. Many existing prosthetic systems use a fixed match between the tibial component and the spacer, or only offer a limited, discrete angle selection (e.g., only a few spacer thicknesses are available). This design makes it difficult to achieve continuous, precise, personalized angle adjustments during surgery, potentially leading to poor prosthesis alignment, which in turn can cause edge loading, abnormal wear, periprosthetic osteolysis, and even early loosening.

[0006] Insufficient inter-component stability: The connection stability between the tibial component and the spacer is crucial. Traditional locking mechanisms may rely on simple snap-fits, screw fixation, or planar fit. Under the complex multi-directional loads of the ankle joint over a long period (especially shear forces and micromotion), these connections may experience micromotion, creep, or locking failure, leading to spacer dislocation, abnormal wear, or the generation of wear debris that can cause osteolysis, severely affecting the long-term stability and lifespan of the prosthesis. Summary of the Invention

[0007] The main objective of this invention is to provide a foot and ankle joint prosthesis to solve the problems of insufficient angle adjustment of the padding and inadequate stability between components in existing foot and ankle joint prostheses.

[0008] To achieve the above objectives, the present invention provides a foot and ankle joint prosthesis, specifically comprising: a tibial component, the tibial component including a base, a support plate, and a central screw; the base including a fixing handle and a base cavity; the fixing handle being fixedly connected to the base cavity; the base cavity having an open, hollow ball-and-socket joint inside; the ball-and-socket joint having a first serration evenly arranged on its inner surface; and a first opening at the center of the ball-and-socket joint; the support plate being a hemispherical solid body disposed within the ball-and-socket joint; the support plate having a second serration evenly arranged on its outer surface; the second serrations engaging with the first serrations to facilitate subsequent angle adjustment of the support plate; a first recess at the bottom of the support plate; and a second opening penetrating the support plate body at the center of the support plate; the diameter of the second opening being larger than the diameter of the first opening to facilitate tilting movement of the support plate before locking; the inner surface of the first recess being evenly arranged... The device includes multiple evenly distributed third openings, and multiple evenly distributed fourth openings at the bottom of the support plate. The tibial component also includes a central screw, which is disposed within the first and second openings, and the diameter of the central screw matches the diameter of the first opening. A washer, which is a cylinder with the same diameter as the support plate, includes a protrusion on its upper part, the shape of which matches the first recess. A second recess is provided at the top of the protrusion, and the shape of the second recess matches the nut of the central screw. The bottom of the washer has an arc-shaped third recess for easy assembly with the talus component. The ankle joint prosthesis also includes a talus component, the shape of which matches the third recess. Multiple conical second fixing blocks are symmetrically distributed on the sides of the talus component, and multiple evenly distributed third fixing blocks are also present at the bottom to enhance the stability of the talus component.

[0009] Furthermore, the fixing handle is a cylinder with multiple grooves evenly distributed on its outer surface, the first opening is a threaded hole to enhance the connection and fixation with the central screw, the first serration is arranged in a ring, the two rows of serrations are arranged vertically and concentrically, and the outer surface of the base is a 3D printed trabecular bone structure to facilitate better bone ingrowth.

[0010] Furthermore, the first recess is cylindrical in shape to facilitate combination with the gasket, the third opening is a rectangular opening with an internal cavity in the shape of a cylinder, and the fourth opening is a cuboid opening.

[0011] Furthermore, the central screw includes a hexagonal nut, a central slide bar, and a bottom screw. The hexagonal nut is arc-shaped. The bottom screw meshes with the first opening. The length of the central slide bar matches the length of the second opening. The length of the bottom screw matches the length of the first opening. The central screw passes through the second opening on the support plate and is screwed into the first opening on the base for fixation.

[0012] Furthermore, the upper part of the protrusion has a plurality of fifth openings evenly distributed thereon, the fifth openings extending from the second recess to the outer surface of the protrusion; a third opening is correspondingly provided inside the fifth opening, into which a connecting rod extends to the tray plate, for connecting with the tray plate.

[0013] Furthermore, the connecting rod includes a ball head, a first connecting rod, a first elastic component, a second connecting rod, and a second elastic component. The diameter of the ball head is the same as the width of the fifth opening. The ball head is connected and fixed to the first connecting rod. The first elastic component is disposed between the first connecting rod and the second connecting rod. Both the first elastic component and the second elastic component are made of elastic material. The second elastic component is an arc-shaped component symmetrically disposed on the second connecting rod. The shape of the second elastic component matches the third opening. The second elastic component can be compressed through the fifth opening and then inserted into the third opening for reinforcement and fixation.

[0014] Furthermore, a plurality of first fixing blocks are evenly arranged on the upper part of the gasket. The shape and number of the first fixing blocks match the fourth opening. The first fixing blocks can extend into the fourth opening to achieve enhanced fixation.

[0015] Furthermore, the upper outer surface of the gasket is provided with a groove. The groove is circular, with micropores evenly distributed on the upper surface and a hollow structure inside. Different substances can be added inside the groove to achieve different functions.

[0016] Furthermore, if the spacer is made of polyethylene, hydrogel is added inside the hollow groove. Polyethylene wear particles generated during joint movement will be adsorbed into the groove through the micropores on the groove and combine with the hydrogel, thereby preventing the wear particles from spreading to the bone interface and causing inflammation. If the spacer is made of ceramic, antibacterial and anti-inflammatory drugs are added inside the hollow groove. After implantation into the human body, the drugs can be slowly released through the micropores on the groove, thereby achieving antibacterial and anti-inflammatory effects.

[0017] According to the technical solution of this invention, a foot and ankle joint prosthesis includes a tibial component, a spacer, and a talus component. The tibial component is located on the outermost side and includes a base, a support plate, and a central screw. The upper part of the base is a fixing handle, and the lower part is a base cavity. The interior of the base cavity is a hollow ball-and-socket joint with an annular first serration inside. A first opening is also provided in the center of the ball-and-socket joint. The support plate is a solid hemisphere with a second serration on its outer surface that meshes with the first serration. The angle of the support plate can be adjusted by meshing and rotating. A second opening penetrating the ball is provided in the center of the support plate. A first recess and a fourth opening are provided at the bottom of the support plate for combination with the spacer. A third opening is provided on the inner surface of the first recess for connection with the spacer. The tibial component also includes a central screw, which is screwed into the base through the second opening in the support plate. The first opening secures the base to the support plate. The gasket is cylindrical and connected to the support plate. A protrusion on the upper part of the gasket combines with a first recess on the support plate. A second recess on the top of the protrusion combines with a central screw. A fifth opening is evenly distributed on the upper part of the protrusion, and a connecting rod is installed inside the fifth opening to connect the gasket to the support plate. Multiple first fixing blocks are evenly distributed on the upper part of the gasket, and the shape and number of the first fixing blocks match the fourth opening. A circular groove is provided on the upper outer surface of the gasket, and micropores are evenly distributed on the upper surface of the groove. The groove has a hollow structure inside. A third arc-shaped recess is provided at the bottom of the gasket for combining with the talus component.

[0018] Therefore, the technical solution of this application can realize the fine adjustment of the angle of the pad in the foot and ankle joint prosthesis and enhance the stability between components. 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 schematic diagram of the foot and ankle joint prosthesis is shown.

[0021] Figure 2 A cross-sectional view of the foot and ankle joint prosthesis is shown;

[0022] Figure 3 A cross-sectional view of the base is shown;

[0023] Figure 4 A side view of the tray is shown;

[0024] Figure 5 A top view of the gasket is shown;

[0025] Figure 6 A schematic diagram of the central screw is shown;

[0026] Figure 7 A schematic diagram of the connection part is shown;

[0027] The above-mentioned figures include the following reference numerals: 1, tibia component; 10, base; 100, fixing handle; 1000, groove; 101, base cavity; 1010, ball socket; 1011, first serration; 1012, first opening; 11, support plate; 110, second serration; 111, first recess; 112, second opening; 113, third opening; 114, fourth opening; 12, central screw; 120, hexagonal nut; 121 1. Middle sliding rod; 2. Bottom screw; 3. Washer; 4. Protrusion; 5. Second recess; 6. Fifth opening; 7. Connecting rod; 8. Ball head; 9. First connecting rod; 10. First elastic component; 11. Second connecting rod; 22. Second elastic component; 33. First fixing block; 4. Third recess; 5. Groove; 6. Micropore; 7. Tagus component; 8. Second fixing block; 9. Third fixing block. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] like Figure 1-7The following describes a foot and ankle joint prosthesis, comprising a tibial component 1. The tibial component 1 includes a base 10, which includes a cylindrical fixing handle 100. The fixing handle 100 has uniformly distributed grooves 1000 on its surface for enhanced fixation. The lower part of the base 10 is a base cavity 101, and the interior of the base cavity 101 is a hollow ball-and-socket joint 1010. The inner surface of the ball-and-socket joint 1010 is provided with an annular first serration 1011, which includes two perpendicular and concentric serrations. A first opening 1012, which is a threaded hole, is provided in the center of the inner surface of the ball-and-socket joint 1010. The tibial component 1 also includes a support plate 11 disposed inside the base cavity 101. The support plate 11 is a solid hemisphere. The outer surface of the plate 11 is provided with annular second serrations 110, which mesh with the aforementioned first serrations 1011. The bottom of the support plate 11 is provided with a first recess 111 with a circular opening. A circular second opening 112 is provided in the center of the first recess 111, penetrating the support plate 11. Multiple third openings 113 are evenly distributed on the inner sidewall of the first recess 111. The internal cavity of each third opening 113 is cylindrical. Multiple fourth openings 114 are evenly distributed on the bottom of the support plate 11, and each fourth opening 114 has a rectangular opening. The tibia component 1 includes a central screw 12, which includes a hexagonal nut 120, which is arc-shaped. The central screw 12 also includes a smooth central slide bar 121 and a threaded bottom screw 122. The length of the central slide bar 121 is the same as the length of the second opening 112, and the bottom screw 122 meshes with the first opening 1012 and matches its length. The ankle prosthesis also includes a pad 2, which is a cylinder located at the lower part of the support plate 11. The top of the pad 2 has a cylindrical protrusion 20, the shape of which matches the shape of the first recess 111. The top of the protrusion 20 has a second recess 21, the shape of which matches the shape of the hexagonal nut 120 of the central screw 12. The top edge of the protrusion 20 is evenly provided with a plurality of fifth openings 22. For the rectangular channel through the protrusion 20, a connecting rod 23 is correspondingly provided inside the fifth opening 22. The connecting rod 23 can extend from the fifth opening 22 to the third opening 113 to enhance the fixation between components. The top of the gasket 2 is uniformly provided with a plurality of first fixing blocks 24 in the shape of cuboids. The shape of the first fixing blocks 24 matches the fourth opening 114. The first fixing blocks 24 can extend into the fourth opening 114 to enhance fixation. The bottom of the gasket 2 is provided with an arc-shaped third recess 25. The third recess 25 can be combined with the talus component 3. The upper outer surface of the gasket 2 is provided with an annular groove 26. The upper surface of the groove 26 is uniformly provided with micropores 261. The inside of the groove 26 is a hollow structure.The ankle joint prosthesis also includes a talus component 3. The upper part of the talus component 3 is an arc-shaped solid, matching the shape of the aforementioned third recess 25. Two conical second fixation blocks 30 are evenly arranged on both sides of the talus component 3, and four third fixation blocks 31 are evenly arranged at the bottom of the talus component 3. The top of each third fixation block 31 is cylindrical, and the bottom is conical.

[0032] like Figure 1 As shown, a foot and ankle joint prosthesis includes a tibial component 1, a pad 2, and a talus component 3. The tibial component 1 includes a base 10, a support plate 11, and a central screw 12 disposed inside the base 10. The support plate 11 is disposed inside the base 10. The base 10 includes a fixing handle 100 and a base cavity 101. The fixing handle 100 is provided with a groove 1000. The top outer surface of the pad 2 is provided with a groove 26. The talus component 3 is disposed at the bottom of the pad. The side of the talus component 3 is provided with a second fixing block 30, and the bottom of the talus component 3 is uniformly provided with a third fixing block.

[0033] like Figure 2 As shown, a cross-sectional view of a foot and ankle joint prosthesis is provided. The base 10 includes a fixing handle 100 and a base cavity 101. The base cavity 101 has a ball socket 1010 inside, and the inner surface of the ball socket 1010 has a first serration 1011. The support plate 11 is a solid hemisphere with a second serration 110 on its outer surface that meshes with the first serration 1011. A second through hole 112 is provided in the center of its interior. The base 10 and the support plate 11 are locked together by a central screw 12. The gasket 2 is a cylinder located at the bottom of the support plate. Multiple connecting rods 23 are evenly arranged on the upper part of the gasket 2 and extend into the support plate 11 to enhance the fixation between the components. The upper outer surface of the gasket 2 has a groove 26, which is a hollow ring. The talus component 3 is located at the bottom of the gasket 2. The upper part of the talus component 3 is an arc-shaped solid, and multiple third fixing blocks 31 are evenly arranged on its bottom.

[0034] like Figure 3 As shown in the cross-sectional view of the base 10, the base 10 includes a fixing handle 100 and a base cavity 101. The fixing handle 100 is a cylinder with a plurality of grooves 1000 evenly arranged on its surface to enhance fixation. The base cavity 101 is a solid cylinder with a hollow ball socket 1010 inside. The inner surface of the ball socket 1010 is provided with a first serration 1011. The first serration 1011 includes two vertically concentric annular serrations. A first opening 1012 is provided in the center of the ball socket 1010. The first opening 1012 is a threaded hole.

[0035] like Figure 4As shown in the side view of the tray 11, the tray 11 is a solid hemisphere. The outer surface is provided with a second serration 110 that meshes with the first serration 1011 on the inner surface of the base 10. The bottom of the tray 11 is provided with a circular first recess 111. The diameter of the first recess 111 is smaller than the bottom of the tray 11. A second opening 112 is provided at the center of the inner surface of the first recess 111. The second opening 112 is a through hole that extends to the outer surface of the tray 11. The diameter of the second opening 112 is larger than the diameter of the central screw 12. A plurality of third openings 113 are evenly provided on the inner surface of the first recess 111. The third openings 113 have a rectangular opening on the outside and a cylindrical hole on the inside. A plurality of fourth openings 114 are evenly provided on the bottom of the tray 11. The fourth openings 114 are cuboid openings.

[0036] like Figure 5 As shown in the side view of the gasket 2, the gasket 2 is a cylinder. A cylindrical protrusion 20 is provided at the top of the gasket 2, the shape of which matches the shape of the first recess 111. A hexagonal second recess 21 is provided at the top of the protrusion 20, the shape of which matches the shape of the nut of the central screw 12. Multiple fifth openings 22 are evenly distributed on the inner surface of the second recess 21. Each fifth opening 22 is a rectangular through hole extending from the inner surface of the second recess 21 to the outer surface of the protrusion 20. A connecting rod 23 is correspondingly provided inside the fifth opening 22. A plurality of first fixing blocks 24 are evenly provided on the top of the gasket 2. The shape and number of the first fixing blocks 24 match the fourth opening 114. An arc-shaped third recess 25 is provided at the bottom of the gasket 2. A groove 26 is provided on the top outer surface of the gasket 2. The groove 26 is a ring with an inwardly inclined surface at the top. The inside of the groove 26 is a hollow structure for placing the corresponding reagent. The inwardly inclined surface at the top of the groove 26 is a porous structure with a plurality of micropores 261 evenly distributed.

[0037] like Figure 6 The diagram shows a central screw 12, which includes a hexagonal nut 120, a central slide bar 121, and a bottom screw 122. The upper part of the hexagonal nut 120 is arc-shaped. The length of the central slide bar 121 matches the length of the second opening 112. The surface of the central slide bar is a smooth surface. The length of the bottom screw 122 matches the length of the first opening 1012. The bottom screw 122 and the first opening 1012 mesh with each other.

[0038] like Figure 7The diagram shows a schematic of the connecting rod 23, which includes a ball head 230, a first connecting rod 231, a first elastic component 232, a second connecting rod 233, and a second elastic component 234. The diameter of the ball head 230 is the same as the width of the fifth opening 22. The ball head 230 is connected and fixed to the first connecting rod 231. The first elastic component 232 is disposed between the first connecting rod 231 and the second connecting rod 233. Both the first elastic component 232 and the second elastic component 234 are made of elastic material. The second elastic component 234 is an arc-shaped component symmetrically arranged on the second connecting rod 233, and its shape matches the third opening 113.

[0039] When using this invention, the specific technical effects brought about by the embodiments are as follows: The base (with fixing handle) in the tibial component is initially fixed to the prepared bone surface at the distal end of the tibia by press fitting, and the groove on the fixing handle can enhance the fixation; the support plate is placed on the base so that the first serration and the second serration can mesh with each other, the central screw is passed through the second opening on the support plate and screwed into the first opening on the base for a few turns, but not completely tightened. At this time, since the central screw is smaller than the diameter of the second opening on the support plate, the support plate can be rotated within a certain range. If fine adjustment of alignment is required, it can be finely adjusted by rotating the support plate. The support plate can be tilted at a compound angle in the coronal and sagittal planes. Because it is a spherical joint, the adjustment is extremely flexible. The surgeon moves the ankle joint while observing joint stability and alignment (assisted by intraoperative X-rays) until the ideal position is found—that is, a position where the joint is evenly stressed, the soft tissue tension is balanced, and the force line is neutral. At this point, the first and second saw teeth still mesh with each other after adjustment. Once the position is determined, the surgeon uses a wrench with a preset torque to tighten the central locking screw. During the tightening process, the huge tension force generated by the screw strongly presses the support plate and the base ball joint together. The saw teeth on both surfaces slide against each other under pressure, eventually fully engaging to form a highly rigid, immovable mechanical connection. The design of the saw teeth ensures that it can withstand huge vertical pressure as well as effectively resist shear and rotational forces. After the tibial component is positioned, the shim is pushed into the bottom of the support plate. During assembly, the first fixing block on the shim is aligned with the fourth opening on the support plate. As the shim is pushed, when the connecting rod in the shim encounters the hexagonal nut of the central screw, the connecting rod will be slowly pushed out of the fifth opening because the hexagonal nut is curved. Since it has not yet contacted the third opening in the support plate, the first elastic component in the middle of the connecting rod will be compressed. When the connecting rod is slowly pushed out completely from the fifth opening, the second elastic component on the connecting rod will contact the third opening in the support plate. Because its size is larger than the outer part of the third opening, the second elastic component will be compressed. The opening allows the second elastic component to be compressed. When all the protrusions on the pad are pushed into the first recess on the support plate, the connecting rod is fully inserted into the fifth opening. The first elastic component pushes the second connecting rod outward, thereby driving the second elastic component into the third opening. When a "click" is heard, the second elastic component is fully inserted into the third opening, and the first fixing block on the pad is also fully inserted into the fourth opening on the support plate, completing the connection between the pad and the support plate and strengthening the connection and fixation between the pad and the support plate. Finally, the talus component is pushed into the third recess at the bottom of the pad to complete the implantation and fixation of the ankle joint prosthesis.

[0040] In summary, this invention achieves fine-tuning alignment of the ankle joint prosthesis by dividing the tibial component into a base and a support plate, adjusting the angle between them using interlocking serrations, and fixing them with a central screw. Furthermore, by incorporating connecting rods and fixing blocks on the gasket, stability between the gasket and the tibial component is enhanced, and grooves are provided to absorb debris generated by friction between the gasket and the tibial component, preventing inflammation. Simultaneously, the gasket can enclose the talus component, allowing it to slide forward and backward. Therefore, this invention enables fine-tuning of the alignment of the ankle joint prosthesis while enhancing the stability between components.

[0041] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this 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 a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] 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.

[0043] 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.

[0044] 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. A foot and ankle joint prosthesis, characterized in that, include: Tibial component (1), said tibial component (1) comprising: The base (10) includes a fixed handle (100) and a base cavity (101). The base cavity (101) has a ball socket (1010) inside. The ball socket (1010) is an open hollow structure. The inner surface of the ball socket (1010) is provided with a first serration (1011). The ball socket (1010) has a first opening (1012) in the center. The tray (11) is a hemispherical solid body and is disposed inside the ball socket (1010). The outer surface of the tray (11) is provided with a second serration (110), which meshes with the first serration (1011). The bottom of the tray (11) is provided with a first recess (111). The center of the tray (11) is provided with a second opening (112) that penetrates the main body of the tray. The diameter of the second opening (112) is larger than that of the first opening (1012). A plurality of third openings (113) are evenly distributed on the inner surface of the first recess (111). A plurality of fourth openings (114) are evenly distributed on the bottom of the tray (11). A central screw (12) is placed in the first opening (1012) and the second opening (112), and the diameter of the central screw (12) matches the diameter of the first opening (1012). Gasket (2), wherein the gasket (2) is a cylinder with the same diameter as the tray (11), comprising: A protrusion (20) is provided on the upper part of the gasket (2), and its shape matches the first recess (111). The second recess (21) is provided on the top of the protrusion (20), and the shape of the second recess (21) matches the nut of the central screw (12). The third recess (25) is an arc-shaped recess located at the bottom of the gasket (2); The talus component (3) is disposed inside the third recess (25). The shape of the talus component (3) matches the third recess (25). The talus component (3) has multiple conical second fixing blocks (30) symmetrically distributed on its side and multiple third fixing blocks (31) evenly distributed at its bottom. The top of the third fixing block (31) is a cylinder and the bottom is a cone.

2. The foot and ankle joint prosthesis according to claim 1, characterized in that, The fixing handle (100) is a cylinder with multiple grooves (1000) evenly distributed on its outer surface. The first opening (1012) is a threaded hole. The first serration (1011) is arranged in a ring. The two rows of first serrations are arranged vertically and concentrically. The outer surface of the base (10) is a 3D printed trabecular bone structure.

3. The foot and ankle joint prosthesis according to claim 1, characterized in that, The first recess (111) is cylindrical, the third opening (113) is a rectangular opening with an internal hole in the shape of a cylinder, and the fourth opening (114) is a cuboid opening.

4. The foot and ankle joint prosthesis according to claim 1, characterized in that, The central screw (12) includes a hexagonal nut (120), a central slide bar (121), and a bottom screw (122). The top of the hexagonal nut (120) is arc-shaped. The thread on the surface of the bottom screw (122) meshes with the thread on the inner surface of the first opening (1012). The length of the central slide bar (121) matches the length of the second opening (112), and the length of the bottom screw (122) matches the length of the first opening (1012).

5. The foot and ankle joint prosthesis according to claim 1, characterized in that, The upper part of the protrusion (20) has a plurality of fifth openings (22) evenly distributed. The fifth opening (22) is a rectangular opening that extends from the second recess (21) to the outer surface of the protrusion (20). A connecting rod (23) is correspondingly provided inside the fifth opening (22).

6. The foot and ankle joint prosthesis according to claim 5, characterized in that, The connecting rod (23) includes a ball head (230), a first connecting rod (231), a first elastic component (232), a second connecting rod (233), and a second elastic component (234). The diameter of the ball head (230) is the same as the width of the fifth opening (22). The ball head (230) is connected and fixed to the first connecting rod (231). The first elastic component (232) is disposed between the first connecting rod (231) and the second connecting rod (233). Both the first elastic component (232) and the second elastic component (234) are made of elastic material. The second elastic component (234) is an arc-shaped component symmetrically disposed on the second connecting rod (233) and its shape matches the third opening (113).

7. The foot and ankle joint prosthesis according to claim 1, characterized in that, The upper part of the gasket (2) is uniformly provided with a plurality of first fixing blocks (24), the shape and number of the first fixing blocks matching the fourth opening (114).

8. The foot and ankle joint prosthesis according to claim 1, characterized in that, The upper outer surface of the gasket (2) is provided with a groove (26), the groove (26) is a ring, the upper surface is uniformly distributed with micropores (261), and the interior is a hollow structure.

9. A foot and ankle joint prosthesis according to claim 8, characterized in that, If the gasket (2) is made of polyethylene, hydrogel is added inside the hollow groove (26); if the gasket (2) is made of ceramic, antibacterial and anti-inflammatory drugs are added inside the hollow groove (26).

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