A tibial prosthesis

Abstract

A tibial prosthesis comprises a tibial pad, a platform holder and a pushing part. The upper part of the pad has a first fixing block connected with femoral condyle, the middle part has a first opening, and the periphery has three second openings with second fixing blocks. The first recess has a third opening, and the bottom has a fourth opening with a first limiting block with a fifth opening. The spring in the third opening pushes the second limiting block to be clamped in the fifth opening. The platform holder has a sixth opening and a second recess, the upper part has a seventh opening with a fourth limiting block that can be expanded, and the second recess has a fifth limiting block that is hinged. The pushing part is set in the lower part of the platform holder, which comprises a hexagonal screw and a fixing ring, the screw has a ninth opening, and the fixing ring is connected with the rotating part through a ratchet. When rotating, the rotating part pushes the first limiting block into the seventh opening, expands the fourth limiting block, and then shrinks the limiting block, while the second limiting block is clamped in the fifth opening to be fixed. The second fixing block is clamped in the ninth opening to connect the screw with the pad. When the rotating part enters the second recess, it pushes the fifth limiting block to be clamped in the recess, and the overall fixation is completed.

Description

Technical Field

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

[0002] Total knee arthroplasty is one of the most effective treatments for advanced knee joint disease and for restoring joint function. It involves implanting an artificial knee prosthesis to replace the damaged articular surfaces, thereby eliminating pain, correcting deformities, and restoring joint stability. Knee prostheses are typically designed with a femoral component and a tibial component. The tibial component serves as the supporting structure and generally includes a tibial plateau support that contacts and fixes to the tibial bone bed, and a tibial pad that forms the articular surface with the femoral component.

[0003] In existing prosthesis designs, the tibial plateau and tibial pad are typically initially fixed using a snap-fit ​​structure. This snap-fit ​​structure generally involves setting protrusions or grooves on the tibial plateau and corresponding buckles or locking mechanisms on the tibial pad, utilizing the elastic deformation of the materials to achieve locking between the two.

[0004] However, in actual clinical applications and long-term implantation, existing snap-fit ​​structures have insufficient connection reliability. Although the snap-fit ​​structure can provide a certain locking force during initial installation, the complex shear and torsional forces generated during knee joint flexion, extension, and rotation make the snap-fit ​​structure prone to fatigue wear or creep under long-term alternating loads, leading to loosening. Once loosening occurs, micromovements will occur between the tibial pad and the tibial plateau, which can not only generate abrasive debris to induce aseptic loosening but also cause pad dislocation, leading to surgical failure.

[0005] The connection method between the tibial platform and the tibial pad and the implantation structure of the tibial components in the existing technology still need to be improved. There is an urgent need for a tibial prosthesis that is reliable in connection, easy to operate and causes little damage to the prosthesis. Summary of the Invention

[0006] The main objective of this invention is to provide a tibial prosthesis to solve the problem of insufficient connection between the tibial pad and the tibial plateau.

[0007] To achieve the above objectives, the present invention provides a tibial prosthesis, specifically comprising: a tibial pad, a platform support, and a pushing part. The tibial pad has a through-hole circular first opening in the center, and three first grooves are evenly distributed on its side surface. Each first groove is rectangular and accommodates a rotating part. A first limiting block is correspondingly disposed within each first groove, the upper surface of which is inclined, allowing the first limiting block to move vertically within the first groove. The platform support is disposed at the lower part of the tibial pad, and a through-hole circular sixth opening is provided in the center of the platform support. The diameter of the sixth opening matches the diameter of the first opening. Three second grooves are evenly distributed on the side surface of the platform support, their positions corresponding to the positions of the first grooves. Three seventh openings are also evenly distributed on the platform support. A limiting block can be pushed into a seventh opening. A third limiting block and a fourth limiting block are provided in the seventh opening. The fourth limiting block can restrict the movement of the first limiting block that is pushed in. A housing is connected to the lower part of the platform support. The housing is a hollow structure. Three eighth openings are evenly provided on the side of the housing. A pushing part is provided inside the housing. The pushing part includes a hexagonal screw. The hexagonal screw passes through the first opening and the sixth opening and extends into the housing. The hexagonal screw has a first thread on its outside. A fixing ring is sleeved on the outside of the hexagonal screw. The fixing ring is fixedly connected to the inside of the housing. At the same time, three rotating parts are evenly provided on the fixing ring. The rotating parts can rotate and extend out of the housing.

[0008] Furthermore, the tibial pad is provided with a first fixing block, which can be used to fix the femoral condyle. The tibial pad is uniformly provided with three arc-shaped second openings, and an arc-shaped second fixing block is correspondingly provided in the second opening. The second fixing block can move within the second opening. A rectangular third opening is symmetrically provided on the side of the first groove, and a circular fourth opening is provided on the bottom surface of the first groove. The first limiting block can extend through the fourth opening. The limiting block includes a top and middle part in the shape of a cylinder. The bottom of the first limiting block is a frustum. The upper surface of the top is an inclined surface, and two fifth openings are symmetrically provided on the side. The first limiting block can move up and down within the first groove.

[0009] Furthermore, the diameter of the fourth opening is the same as the diameter of the top of the first limiting block. The diameter of the middle part of the first limiting block is smaller than the diameter of the top. The bottom of the first limiting block is a frustum, and the diameter of the wider end of the bottom is the same as the diameter of the top. Therefore, the first limiting block can move up and down through the fourth opening. A second limiting block is correspondingly provided in the third opening symmetrically arranged on the side of the first groove. The head of the second limiting block near the first limiting block is arc-shaped. A first spring is connected to the end of the second limiting block away from the first limiting block. The first spring is arranged and connected in the third opening. The second limiting block can be pushed out of the third opening by the first spring and extended into the fifth openings on both sides of the first limiting block to achieve the limiting effect on the first limiting block.

[0010] Furthermore, the upper part of the hexagonal screw in the pushing part is evenly provided with three arc-shaped ninth openings, which correspond to the positions of the second openings on the tibial pad. Therefore, the second fixing block can be pushed into the ninth opening through the second opening, thereby connecting the tibial pad and the hexagonal screw to achieve a limiting function.

[0011] Furthermore, the diameter of the sixth opening on the platform support is the same as the diameter of the first opening, and the hexagonal screw can pass through both the first and sixth openings; the diameter of the seventh opening matches the diameter of the widest part of the top of the first limiting block, and the first limiting block can be pushed into the seventh opening. A circular third limiting block is provided at the top of the seventh opening, and multiple fourth limiting blocks are evenly arranged on the third limiting block. The fourth limiting block is an arc-shaped baffle, and the direction of the fourth limiting block is inward toward the center of the seventh opening. Therefore, the fourth limiting block forms a structure that is wider at the top and narrower at the bottom. At the same time, the fourth limiting block can be opened by the first limiting block and limit the first limiting block to prevent the first limiting block from retracting.

[0012] Furthermore, three third grooves are correspondingly provided in the second groove on the side of the platform support. The third groove is an arc-shaped groove. A first connecting rod is correspondingly provided in the third groove. An arc-shaped fifth limiting block is provided in the third groove. The head of the fifth limiting block is a triangular block. The fifth limiting block is hinged to the first connecting rod. The fifth limiting block can rotate around the first connecting rod in the third groove.

[0013] Furthermore, a fixing ring is set inside the outer casing, on which three third fixing blocks are evenly arranged, and a second connecting rod is set in the middle of the third fixing blocks.

[0014] Furthermore, one end of the rotating part is connected to a ratchet, which meshes with the first thread on the outer surface of the hexagonal screw. At the same time, the ratchet is mounted on the third fixing block and forms a hinge connection with the second connecting rod, so the ratchet can rotate around the second connecting rod. Therefore, when the hexagonal screw rotates, it can drive the ratchet to rotate. The rotation of the ratchet drives the rotating part to rotate and extends out from the eighth opening of the outer shell. The head of the rotating part is a fourth fixing block, which is a triangular block. When the rotating part rotates into the first groove position, the fourth fixing block can contact the first limiting block and push the first limiting block downward.

[0015] Furthermore, the rotating part is provided with a fourth groove, the shape of which matches the fifth limiting block. Therefore, the fifth limiting block can be pushed into the fourth groove, thereby achieving the limiting effect on the rotating part.

[0016] According to the technical solution of this invention, a tibial prosthesis includes a tibial pad, a plateau support, and a pushing part. The tibial pad is disc-shaped, with a first fixing block on the upper part, which can be connected and fixed to the femoral condyle. A through circular first opening is provided in the middle of the tibial pad. Three arc-shaped second openings are evenly provided on the tibial pad, and arc-shaped second fixing blocks are correspondingly provided in the second openings. Three first grooves are evenly provided on the side of the tibial pad. Two third openings are symmetrically provided on the side of the first grooves. A circular fourth opening is provided at the bottom, and a first limiting block is provided above the fourth opening. The first limiting block includes a cylindrical part. The top and middle parts of the body are truncated cones, while the bottom is a frustum. The upper surface of the top of the first limiting block is inclined, and a fifth opening is symmetrically arranged on the side. A second limiting block is correspondingly arranged in the third opening. The head of the second limiting block is arc-shaped. A first spring is connected to the end of the second limiting block away from the first limiting block. The other end of the first spring is connected to the third opening. The first spring can push the second limiting block into the fifth opening on the side of the first limiting block, thus limiting the first limiting block. The platform support is arranged at the lower part of the tibial pad, and the middle part of the platform support... A circular, through-hole sixth opening is provided, the diameter of which is the same as the diameter of the first opening. Three second grooves are evenly distributed on the side of the platform support, their positions corresponding to the positions of the first grooves. Three seventh openings are evenly distributed on the upper part of the platform support. A third and fourth limiting block are correspondingly arranged within each seventh opening. The third limiting block is positioned as a ring at the top of the seventh opening. The fourth limiting block consists of multiple arc-shaped baffles evenly distributed on the third limiting block, and the direction of the fourth limiting block is towards the indicated... The center of the seven openings is inwardly recessed. The fourth limiting block can be opened by the first limiting block to limit the first limiting block. The second groove of the platform support is provided with three third grooves. The third groove is an arc-shaped groove. The first connecting rod is provided in the third groove. The arc-shaped fifth limiting block is provided in the third groove. The head of the fifth limiting block is a triangular block. The fifth limiting block is hinged to the first connecting rod. The lower part of the platform support is provided with a shell. The shell is a hollow structure. Three eighth openings are evenly provided on the side of the shell.The housing contains a pushing part, which includes a hexagonal screw. Three arc-shaped ninth openings are evenly distributed on the upper outer surface of the hexagonal screw. The second fixing block can be pushed into the ninth opening from the second opening, thereby connecting and limiting the tibial pad and the hexagonal screw. The outer surface of the hexagonal screw has a first thread. The pushing part also includes a fixing ring, which is fitted onto the outer surface of the hexagonal screw and fixed inside the housing. Three third fixing blocks are evenly distributed on the upper surface of the fixing ring, and a second connecting rod is provided on each of the third fixing blocks. One end of the rotating part is connected to a ratchet, which is hinged to the second connecting rod and can rotate. The ratchet engages with the first thread of the hexagonal screw, so that when the hexagonal screw rotates, it drives the ratchet to rotate around the second connecting rod. The rotation of the ratchet causes the rotating part to rotate and extend out from the eighth opening of the housing. The head of the rotating part is a fourth fixing block. The fourth fixing block is a triangular block that fits against the upper surface of the first limiting block. This allows the fourth fixing block to push the first limiting block downwards and enter the seventh opening of the platform support through the fourth opening of the first groove. The bottom of the first limiting block enters the seventh opening and pushes the fourth limiting block outwards. After the bottom passes the fourth limiting block, the fourth limiting block retracts and restricts upward movement. At this time, the second limiting block is pushed out from the third opening by the first spring and enters the fifth opening of the first limiting block, thus fixing the first limiting block. The rotating part has three corresponding fourth grooves, the shape of which matches the shape of the fifth limiting block. When the rotating part enters the second groove and contacts the fifth limiting block, the rotating part pushes the fifth limiting block to rotate. The fifth limiting block rotates into the rotating part through the fourth groove, thus limiting the rotation and connecting and fixing the tibial pad and the tibial platform.

[0017] Therefore, the technical solution of this application can connect and fix the tibial pad and the tibial plateau by setting a connecting component, which can effectively solve the problem of unreliable connection between the tibial plateau and the tibial pad in the prior art and enhance the overall stability of the prosthesis. Attached Figure Description

[0018] 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:

[0019] Figure 1 A schematic diagram of the tibial prosthesis is shown.

[0020] Figure 2 A schematic diagram of the internal structure of the tibial prosthesis is shown;

[0021] Figure 3A cross-sectional view of the tibial prosthesis is shown.

[0022] Figure 4 A schematic diagram of the tibial pad is shown;

[0023] Figure 5 A cross-sectional view of the first limiting block is shown;

[0024] Figure 6 A schematic diagram of the platform support is shown;

[0025] Figure 7 A sectional view of the platform support section is shown;

[0026] The above-mentioned figures include the following reference numerals: 1. Tibial pad; 10. First fixing block; 11. First opening; 12. Second opening; 13. Second fixing block; 14. First groove; 140. Third opening; 141. Fourth opening; 15. First limiting block; 150. Top; 151. Middle; 152. Bottom; 153. Fifth opening; 16. Second limiting block; 160. First spring; 2. Platform support; 20. Sixth opening; 21. Second groove; 22. Seventh opening; 220. Third limiting block; 221. Fourth limiting block; 23. Third groove; 230. Fifth limiting block; 231. First connecting rod; 24. Outer shell; 240. Eighth opening; 3. Pushing part; 30. Hexagonal screw; 300. Ninth opening; 301. First thread; 31. Retaining ring; 310. Third fixing block; 311. Second connecting rod; 32. Rotating part; 320. Ratchet; 321. Fourth fixing block; 322. Fourth groove. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] like Figure 1-7The following describes a tibial prosthesis: A tibial pad 1, a plateau support 2, and a pushing part 3. The tibial pad 1 has a first fixing block 10, which connects to the femoral condyle for enhanced fixation. A circular through-hole 11 is provided in the center of the tibial pad 1. Three second openings 12 are evenly arranged around the first opening 11, each second opening 12 being arc-shaped. An arc-shaped third fixing block 13 is correspondingly arranged within each second opening 12. Three first grooves 14 are evenly arranged on the sides of the tibial pad 1. Two third openings 140 are symmetrically arranged on the sides of each first groove 14, and a circular fourth opening 141 is provided at the bottom. A first limiting block 15 is provided within each first groove 14. The first limiting block 15 includes a top 150, a middle 151, and a bottom 152. The top 150 is a cylinder with an upper surface... The top 150 has a smaller diameter than the bottom 150, and the bottom 152 is a frustum. The first limiting block 15 can move downward through the fourth opening 141. The first limiting block 15 has a fifth opening 153 symmetrically arranged on its side. The third opening 140 contains a second limiting block 16 and a first spring 160. The head of the second limiting block 16 is arc-shaped. One end of the first spring 160 is connected to the second limiting block 16, and the other end is connected to the third opening 140. The first spring 160 can push the second limiting block 16 outward until it enters the fifth opening 153 on the side of the first limiting block 15, thereby limiting the first limiting block 15.The platform support 2 is disposed at the lower part of the tibial pad 1. The platform support 2 has a circular, through-hole sixth opening 20, the diameter of which is the same as the diameter of the first opening 11. Three second grooves 21 are evenly distributed on the side of the platform support 2, their positions corresponding to the positions of the first grooves 14. Three seventh openings 22 are evenly distributed on the upper part of the platform support 2. A third limiting block 220 and a fourth limiting block 221 are correspondingly disposed within each seventh opening 22. The third limiting block 220 is a ring disposed at the top of the seventh opening 22. The fourth limiting block 220... Positioning blocks 221 are multiple arc-shaped baffles evenly arranged on the third limiting blocks 220. The fourth limiting block 221 is set inward toward the center of the seventh opening 22. The fourth limiting block 221 can be opened by the first limiting block 15 to limit the first limiting block 15. Three third grooves 23 are correspondingly arranged in the second groove 21 of the platform support 2. The third grooves 23 are arc-shaped grooves. A fifth limiting block 230 and a first connecting rod 231 are arranged in the third grooves 23. The fifth limiting block 230 is arc-shaped with a triangular head. The fifth limiting block 230 is hinged to the first connecting rod 231. The platform support 2 has a hollow shell 24 at its lower part. The shell 24 has three evenly spaced eighth openings 240 on its side. The pushing part 3 is located inside the shell 24 and includes a hexagonal screw 30. The hexagonal screw 30 passes through the first opening 11 and the sixth opening 20 and enters the shell 24. The upper outer surface of the hexagonal screw 30 has three evenly spaced arc-shaped ninth openings 300. The second fixing block 13 can pass through the second opening 11. The device 2 is pushed into the ninth opening 300, thereby connecting and defining the tibial pad 1 and the hexagonal screw 30. The outer surface of the hexagonal screw 30 is provided with a first thread 301. The pushing part 3 also includes a fixing ring 31 sleeved on the outer surface of the hexagonal screw 30. The fixing ring 31 is connected and fixed inside the outer shell 24. Three third fixing blocks 310 are evenly arranged on the upper surface of the fixing ring 31. A second connecting rod 311 is provided on the third fixing block 310. The pushing part 3 also includes a rotating part 32. One end of the rotating part 32 is connected to a ratchet 320. The ratchet 320 rotates by hinge connection with the second connecting rod 311. The ratchet 320 engages with the first thread 301 of the hexagonal screw 30. The head of the rotating part 32 is a fourth fixing block 321, which is a triangular block. A fourth groove 322 is correspondingly provided on the rotating part 32, and the shape of the fourth groove 322 matches the shape of the fifth limiting block 230.

[0031] like Figure 1As shown, a tibial prosthesis includes a tibial pad 1 and a platform support 2. The tibial pad 1 is provided with a first fixing block 10. The side of the tibial pad 1 is uniformly provided with a first groove 14. The platform support 2 is located at the lower part of the tibial pad 1. The side of the platform support 2 is uniformly provided with a second groove 21 corresponding to the position of the first groove 14. The lower part of the platform support 2 is provided with a shell 24. The shell 24 is a hollow structure. The side of the shell 24 is uniformly provided with three eighth openings 240. The hexagonal screw 30 passes through the tibial pad 1 and the platform support 2 and enters the interior of the shell 24. The rotating part 32 extends out from the eighth opening 240 and enters the first groove 14 and the second groove 21.

[0032] like Figure 2 As shown, a tibial prosthesis has three arc-shaped second openings 12 evenly arranged on the tibial pad 1. The pushing part 3 includes a hexagonal screw 30, a fixing ring 31, and a rotating part 32. The hexagonal screw 30 passes through the tibial pad 1 and the platform support 2. The outer surface of the hexagonal screw 30 is provided with a first thread 301. The pushing part 3 also includes a fixing ring 31 sleeved on the outer surface of the hexagonal screw 30. A third fixing block 310 is provided on the fixing ring 31. A second connecting rod 311 is provided on the third fixing ring 310. A ratchet 320 is provided at one end of the rotating part 32. The ratchet 320 is hinged to the second connecting rod 311 and thus rotates. The ratchet 320 meshes with the first thread 301 of the hexagonal screw 30.

[0033] like Figure 3 As shown in the cross-sectional view of a tibial prosthesis, the tibial pad 1 has three arc-shaped second openings 12 evenly arranged on it. A second fixing block 13 is correspondingly arranged within each second opening 12. The second fixing block 13 can be pushed from the second opening 12 into the ninth opening 300 of the hexagonal screw 30. The tibial pad 1 has multiple first grooves 14 evenly arranged on its side, each first groove 14 containing a first limiting block 15. The platform support 2 has multiple seventh openings 22 evenly arranged inside it, each seventh opening 22 containing a fourth limiting block 221. The fourth limiting block 221 can be pushed into the ninth opening 300 of the hexagonal screw 30. A limiting block 15 is opened and thus limits the first limiting block 15. A third groove 23 is provided on the side of the platform support 2. A fifth limiting block 230 and a first connecting rod 231 are provided in the third groove 23. The fifth limiting block 230 and the first connecting rod 231 are hinged together. The ratchet 320 engages with the hexagonal screw 30. A fourth fixing block 321 is provided at the head of the rotating part 32. The fourth fixing block 321 is a triangular block. A fourth groove 322 is provided inside the rotating part 32. The shape of the fourth groove 322 matches that of the fifth limiting block 230.

[0034] like Figure 4 As shown, the tibial pad 1 is provided with a first fixing block 10, and a circular through first opening 11 is provided in the middle of the tibial pad 1. Three arc-shaped second openings 12 are evenly provided around the first opening 11 on the tibial pad 1. Three first grooves 14 are evenly provided on the side of the tibial pad 1. A circular fourth opening 141 is provided at the bottom of the first groove 14. A first limiting block 15 is provided in the first groove 14. The first limiting block 15 can pass through the fourth opening 141. Second limiting blocks 16 are symmetrically provided on the side of the first groove 14.

[0035] like Figure 5 As shown, the first groove 14 is disposed on the side of the tibial pad 1. A third opening 140 is symmetrically disposed on the side of the first groove 14. A circular fourth opening 141 is disposed at the bottom of the first groove 14. A first limiting block 15 is disposed within the first groove 14. The first limiting block 15 includes a top 150, a middle portion 151, and a bottom 152. The top 150 is a cylinder with an inclined upper surface. The middle portion 151 is a cylinder with a diameter smaller than that of the top 150. The bottom 152 is shaped like a frustum. 5 can move downward through the fourth opening 141. The first limiting block 15 has a fifth opening 153 symmetrically arranged on its side. The third opening 140 has a second limiting block 16 and a first spring 160. The head of the second limiting block 16 is arc-shaped. One end of the first spring 160 is connected to the second limiting block 16 and the other end is connected to the third opening 140. The first spring 160 can push the second limiting block 16 to move outward until it enters the fifth opening 153 on the side of the first limiting block 15, thereby limiting the first limiting block 15.

[0036] like Figure 6 As shown, a through circular sixth opening 20 is provided in the middle of the platform support 2. The diameter of the sixth opening 20 is the same as the diameter of the first opening 11. Three second grooves 21 are evenly provided on the side of the platform support 2. The positions of the second grooves 21 correspond to the positions of the first grooves 14. Three seventh openings 22 are evenly provided on the upper part of the platform support 2. A third limiting block 220 and a fourth limiting block 221 are correspondingly provided in the seventh opening 22. Three third grooves 23 are correspondingly provided in the second grooves 21. The third grooves 23 are arc-shaped grooves. An arc-shaped fifth limiting block 230 is provided in the third grooves 23.

[0037] like Figure 7As shown, the platform support 2 has three seventh openings 22 evenly arranged on its upper part. A third limiting block 220 and a fourth limiting block 221 are correspondingly arranged within each seventh opening 22. The third limiting block 220 is a ring located at the top of the seventh opening 22. The fourth limiting block 221 consists of multiple arc-shaped baffles evenly arranged on the third limiting block 220. The fourth limiting block 221 is oriented inwards towards the center of the seventh opening 22. The fourth limiting block 221 can be opened by the first limiting block 15, thus limiting the first limiting block 15. The platform support 2 has three third grooves 23 correspondingly arranged within its second groove 21. Each third groove 23 is an arc-shaped groove. A fifth limiting block 230 and a first connecting rod 231 are arranged within each third groove 23. The fifth limiting block 230 is arc-shaped with a triangular head. The fifth limiting block 230 and the first connecting rod 231 are hinged together.

[0038] When using this invention, the specific technical effects brought about by the embodiments are as follows: After the tibial prosthesis is implanted, the tibial pad is placed on the platform support, and the first groove on the tibial pad is aligned with the second groove on the platform support. A hexagonal screw is inserted into the housing through the first opening on the tibial pad and the sixth opening on the platform support. When the hexagonal screw rotates into the housing and contacts the ratchet, the rotating hexagonal screw drives the ratchet to rotate. The rotation of the ratchet causes the rotating part to be rotated and lifted and extend out from the eighth opening of the housing until the rotating part is lifted into the first groove of the tibial pad and the second groove of the platform support. The fourth fixing block is in contact with the upper surface of the first limiting block, so that the fourth fixing block can push the first limiting block downward and enter the seventh opening of the platform support through the fourth opening of the first groove. The bottom of the positioning block enters the seventh opening and pushes the fourth limiting block in the seventh opening outward. After the bottom passes the fourth limiting block, the fourth limiting block retracts and restricts the bottom from moving upward. At this time, the second limiting block is pushed out from the third opening by the first spring and enters the fifth opening of the first limiting block, thereby limiting and fixing the first limiting block. When the rotating part rotates into the second groove and contacts the fifth limiting block, the rotating part can push the fifth limiting block to rotate. The fifth limiting block rotates into the rotating part through the fourth groove, thereby limiting the rotating part and thus connecting and fixing the tibial pad and the tibial plateau. When the rotating part is completely inserted into the first groove and the second groove, the hexagonal screw stops rotating. At this time, the second fixing block in the second opening is pushed into the ninth opening in the hexagonal screw, thereby connecting and fixing the tibial pad and the hexagonal screw.

[0039] In summary, by setting a locking and limiting component, the present invention achieves locking and fixing of the tibial pad and the tibial plateau, enhancing the stability between components and improving the overall stability of the prosthesis.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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 tibial prosthesis, characterized in that, include: Tibial pad (1), the tibial pad (1) has a through first opening (11) in the middle, and the tibial pad (1) has a plurality of first grooves (14) evenly arranged on the side, and a first limiting block (15) is correspondingly arranged in the first groove (14). Platform support (2), the platform support (2) is located at the lower part of the tibial pad (1), the platform support (2) has a through sixth opening (20) in the middle, the diameter of the sixth opening (20) on the platform support (2) is the same as the diameter of the first opening (11), the platform support (2) has a plurality of second grooves (21) evenly arranged on the side, the platform support (2) has a plurality of seventh openings (22) evenly arranged on the platform support (2), the diameter of the seventh opening (22) matches the diameter of the widest part of the first limiting block (15), and a third limiting block (22) is arranged in the seventh opening (22). 0) and the fourth limiting block (221), the third limiting block (220) is a ring set on the top of the seventh opening (22), the fourth limiting block (221) is a plurality of arc-shaped baffles evenly arranged on the third limiting block (220), the plurality of fourth limiting blocks (221) are arranged in the direction of inward towards the center of the seventh opening (22), the fourth limiting block (221) can be opened and play a limiting role on the first limiting block (15), the bottom of the platform support (2) is provided with a shell (24), and the side of the shell (24) is evenly provided with a plurality of eighth openings (240); The pushing part (3) is disposed inside the outer shell (24). The pushing part (3) includes a hexagonal screw (30). The hexagonal screw (30) has a first thread (301) on its outside. A fixing ring (31) is sleeved on the outside of the hexagonal screw (30). The fixing ring (31) is fixedly connected to the outer shell (24). A plurality of rotating parts (32) are evenly arranged on the fixing ring (31). One end of the rotating part (32) is connected to a ratchet (320). The ratchet (320) meshes with the first thread (301) on the outside of the hexagonal screw (30). The rotating part (32) can rotate and extend out from the eighth opening (240) of the outer shell (24). The head of the rotating part (32) is a fourth fixing block (321). The fourth fixing block (321) is a triangular block. The fourth fixing block (321) can push the first limiting block (15) downward.

2. The tibial prosthesis according to claim 1, characterized in that, The tibial pad (1) is provided with a first fixing block (10), and three arc-shaped second openings (12) are evenly provided on the tibial pad (1). An arc-shaped second fixing block (13) is provided in the second opening (12). A third opening (140) is symmetrically provided on the side of the first groove (14). A fourth opening (141) is provided at the bottom of the first groove (14). The first limiting block (15) includes a top (150) and a middle part (151) in the shape of a cylinder, and a bottom (152) in the shape of a frustum. The upper surface of the top (150) is an inclined surface, and a fifth opening (153) is symmetrically provided on the side.

3. A tibial prosthesis according to claim 2, characterized in that, The diameter of the fourth opening (141) is the same as the diameter of the top (150) of the first limiting block (15). The diameter of the middle part (151) of the first limiting block (15) is smaller than the diameter of the top (150). The diameter of the wider end of the bottom (152) of the first limiting block (15) is the same as the diameter of the top (150). A second limiting block (16) is provided in the third opening (140). A first spring (160) is connected to the end of the second limiting block (16) away from the first limiting block (15). The head of the second limiting block (16) is arc-shaped. The second limiting block (16) can be pushed into the fifth opening (153) on the side of the top (150).

4. A tibial prosthesis according to claim 2, characterized in that, The upper part of the hexagonal screw (30) in the pushing part (3) is evenly provided with three arc-shaped ninth openings (300), and the second fixing block (13) can be pushed into the ninth opening (300) through the second opening (12) to achieve the limiting function.

5. A tibial prosthesis according to claim 1, characterized in that, The platform support (2) has three third grooves (23) corresponding to the second groove (21). The third groove (23) is an arc-shaped groove. A first connecting rod (231) is provided on the third groove (23). A fifth limiting block (230) is provided in the third groove (23). The head of the fifth limiting block (230) is a triangular block. The fifth limiting block (230) and the first connecting rod (231) form a hinge connection.

6. A tibial prosthesis according to claim 1, wherein three third fixing blocks (310) are evenly arranged on the fixing ring (31), and a second connecting rod (311) is arranged on the third fixing block (310).

7. A tibial prosthesis according to claim 5, characterized in that, The rotating part (32) is provided with a fourth groove (322), the shape of which matches the fifth limiting block (230), and the fifth limiting block (230) can be pushed into the fourth groove (322) to play a limiting role.

Images