A tibial platform prosthesis

Abstract

The present application relates to a kind of tibial platform prostheses, mainly including tibial spacer, tibial platform and sleeve.First fixed block and three arc-shaped holes are provided in tibial spacer, and movable second fixed block is matched in hole.Tibial platform includes platform support with hole and shell, and shell side and bottom are provided with hole.Screw is inserted into shell through spacer and platform support, and outer side thread is engaged with inner thread of sleeve, and when rotating, it can drive sleeve to move up.Sleeve moves up through articulated connecting rod system from shell side hole, and deeply into medullary cavity to enhance fixation.Spring drive first pusher is provided in screw, and it can be matched with recess of sleeve to prevent downward movement;At the same time, second pusher in screw can be extended into medullary cavity from bottom through thread.The design realizes multidirectional fixation, and improves the stability of prosthesis.

Description

Technical Field

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

[0002] The knee joint is a crucial weight-bearing joint in the lower limbs, and osteoarthritis of the knee is a common disease among the elderly. For severe knee joint diseases, knee replacement surgery is often chosen as a treatment method to improve knee joint function in the long term. Currently, purely mechanical knee prostheses are widely used in knee replacement surgery to relieve pain, correct deformities, and restore joint function. The tibial plateau prosthesis, as a key load-bearing component of the knee prosthesis, directly determines the success rate of the surgery and the lifespan of the prosthesis through its long-term stability.

[0003] Traditional tibial plateau prostheses are typically integrated into the proximal tibial bed using either cemented fixation or biological fixation (cementless fixation). However, regardless of the fixation method, current tibial plateau prostheses still face several challenges and limitations. The long-term stability of biologically fixed prostheses depends on initial mechanical stability. If initial stability is poor, micromovement can exceed a critical threshold, leading to the ingrowth of fibrous tissue (rather than bone tissue) into the pores, forming a fibrous membrane. This ultimately results in aseptic loosening, a major cause of knee replacement surgery failure. Furthermore, once aseptic loosening occurs, revision surgery is required. While porous coated prostheses, firmly integrated with bone, avoid the problem of cement removal, the removal process itself causes significant bone loss, posing a significant challenge to subsequent reconstruction.

[0004] Therefore, a novel tibial plateau prosthesis design is needed that can enhance the stability of the tibial plateau postoperatively while ensuring excellent initial mechanical stability and facilitating removal and minimizing bone loss during long-term revision surgery. Summary of the Invention

[0005] The main objective of this invention is to provide a tibial plateau prosthesis to solve the problem of insufficient stability of the tibial plateau after knee joint prosthesis implantation in the human body.

[0006] To achieve the above objectives, the present invention provides a tibial plateau prosthesis, specifically comprising: a tibial pad, wherein a first fixing block is disposed on the tibial pad, and an arc-shaped first opening is uniformly disposed on the upper surface of the tibial pad extending into the interior of the tibial pad; an arc-shaped second fixing block is correspondingly disposed within the first opening, the second fixing block being movable within the first opening; and a circular second opening is disposed at the bottom of the tibial pad; and a tibial plateau, wherein the tibial plateau is disposed at the lower part of the tibial pad, comprising: a plateau support, wherein a third through opening is disposed in the middle of the plateau support, the third opening having the same diameter as the second opening; and a lower part of the plateau support being provided with... The outer shell is a hollow shell. Three rectangular fourth openings are evenly distributed on the side of the outer shell, and a circular fifth opening is provided on the bottom of the outer shell. A screw with a partially hollow interior is disposed inside the outer shell. The screw passes through a second opening on the tibial pad and a third opening on the platform support. Three arc-shaped sixth openings are evenly distributed on the upper part of the screw, extending into the interior. A first thread is provided on the outer surface of the screw. A rectangular seventh opening is provided on the side of the screw, extending into the interior of the screw. An arc-shaped first pushing part is disposed within the seventh opening. The end of the first pushing part away from the seventh opening is connected to a first… A spring is connected and fixed to the inner surface of the screw. The first spring can push the first pushing part to extend out of the seventh opening. A second thread is provided on the lower part of the inner surface of the screw. A second pushing part is provided inside the screw. The upper part of the second pushing part is cylindrical and the lower part is conical. A third thread is provided on the upper outer surface of the second pushing part. The third thread and the second thread mesh with each other. Grooves are evenly provided on the lower outer surface of the second pushing part. The second pushing part extends out of the eighth opening at the bottom of the screw. The tibial plateau prosthesis also includes a sleeve. The sleeve is fitted on the outer surface of the screw. The inner surface is provided with grooves that interact with the screw. The sleeve has a fourth thread that meshes with the first thread. The upper part of the sleeve is provided with an annular slide rail. The slide rail is embedded inside the sleeve and can slide and rotate inside the sleeve. Three fourth fixing blocks are evenly arranged on the slide rail. A third connecting rod is hinged to the fourth fixing block. A triangular block is provided at the head of the third connecting rod. A second connecting rod is hinged to the third connecting rod. A first connecting rod is hinged to the second connecting rod. The first connecting rod is hinged to the third fixing block. The third fixing block is set on a fixing ring. The fixing ring is sleeved on the upper outer surface of the screw. At the same time, the upper surface of the fixing ring is connected and fixed to the platform support.

[0007] Furthermore, a first fixing block is provided on the upper part of the tibial pad, and three arc-shaped first openings are evenly provided inside the tibial pad. The first openings penetrate to the upper surface of the tibial pad, and an arc-shaped second fixing block is correspondingly provided in the first opening. The diameter of the second opening is the same as the diameter of the screw, and the screw can be inserted into the second opening.

[0008] Furthermore, the screw has three arc-shaped sixth openings evenly arranged inside. The second fixing block can be pushed into the sixth opening from the first opening. Part of the second fixing block remains in the first opening and part is pushed into the sixth opening, thereby connecting the tibial pad and the screw.

[0009] Furthermore, the diameter of the third opening on the platform support is the same as the diameter of the screw, the screw can extend into the housing from the third opening, the third connecting rod can extend out from the fourth opening on the side of the housing, and the second pushing part of the screw can extend out from the fifth opening at the bottom of the housing, thereby enhancing the stability of the tibial plateau.

[0010] Furthermore, the second pushing part can extend from the eighth opening at the bottom of the screw. The upper part of the second pushing part is a cylinder and the lower part is a cone. The surface of the lower cone of the second pushing part is uniformly provided with grooves. After the second pushing part is pushed out and inserted into the medullary cavity, the bone will attach to the grooves to enhance fixation.

[0011] Furthermore, the screw has a rectangular seventh opening on its side and an arc-shaped first pushing part inside the screw. The first pushing part is connected to a first spring, and the end of the first spring away from the first pushing part is connected to the inner surface of the screw. The first spring can push the first pushing part to extend out of the seventh opening.

[0012] Furthermore, the inner surface of the sleeve is provided with a recess, the shape of which matches the first pushing part. When the first pushing part is inserted into the recess, it can limit the movement of the sleeve.

[0013] Furthermore, the inner surface of the sleeve is provided with a fourth thread, which meshes with the first thread on the screw. When the screw is rotated, it can drive the sleeve to rotate upward.

[0014] Furthermore, the slide rail is embedded inside the sleeve, and the slide rail can slide inside the sleeve to prevent the slide rail from rotating with the sleeve; the head of the third connecting rod is provided with a triangular block to enhance the fixation, and the fixing ring is sleeved on the upper outer surface of the screw. At the same time, the upper surface of the fixing ring is connected and fixed to the platform support to prevent the fixing ring from rotating when the screw rotates.

[0015] According to the technical solution of this invention, a tibial plateau prosthesis includes a tibial pad, a tibial plateau, and a sleeve. A first fixing block is provided on the tibial pad. Three arc-shaped first openings are evenly distributed inside the tibial pad, penetrating its upper surface. An arc-shaped second fixing block is correspondingly disposed within each of the first openings, and the second fixing block can move within the first openings. A circular second opening is provided at the bottom of the tibial pad. A tibial plateau is provided at the lower part of the tibial pad. The tibial plateau includes a plateau support at the top. A through third opening is provided in the middle of the plateau support, and the third opening has the same diameter as the second opening. A shell is connected to the lower part of the plateau support. The shell is a hollow shell. Three rectangular fourth openings are evenly distributed on the side of the shell. A circular fifth opening is provided at the bottom of the shell. A screw with a partially hollow internal structure is disposed inside the shell. The screw passes through the second and third openings and is inserted into the shell. Three arc-shaped sixth openings are evenly distributed above the screw. The second fixing block can extend from the first opening into the sixth opening. The outer surface of the screw is provided with a first thread. The side of the screw is provided with a rectangular seventh opening. An arc-shaped first pushing part is provided in the seventh opening. The end of the first pushing part away from the seventh opening is connected to a first spring. The first spring is connected and fixed to the inner surface of the screw. The first spring can push the first pushing block out of the seventh opening. The inner surface of the screw is provided with a second thread. The screw is provided with a second pushing part. The upper part of the second pushing part is a cylinder and the lower part is a cone. The upper outer surface of the second pushing part is provided with a third thread. The third thread engages with the second thread on the inner surface of the screw. The lower outer surface of the second pushing part is uniformly provided with multiple grooves to enhance fixation. The second pushing part can extend from the eighth opening at the bottom of the screw and enter the medullary cavity through the fifth opening of the outer shell.A sleeve is fitted around the screw. A fourth thread is formed on the inner surface of the sleeve, which engages with a first thread on the screw, allowing the sleeve to rotate and move upwards when the screw rotates. A circular slide rail is provided on the upper part of the sleeve, embedded inside the sleeve and capable of rotating within it. Three fourth fixing blocks are evenly arranged on the slide rail. A third connecting rod is hinged to each fourth fixing block, and a second connecting rod is hinged to each third connecting rod. The second connecting rod is hinged to each second connecting rod, and the first connecting rod is hinged to each third fixing block. The third fixing blocks are evenly arranged... On the side of the fixing ring, the fixing ring is a circular ring sleeved on the outer surface of the screw. The upper surface of the fixing ring is connected and fixed to the platform support, thereby limiting the positioning of the connecting rod and the sleeve and restricting the rotation of the sleeve and the connecting rod. When the screw rotates, the sleeve can be driven to move upward along the screw, thereby driving the slide rail to move upward, and then driving the third connecting rod and the second connecting rod on the slide rail to extend out from the fourth opening on the outer shell and enter the medullary cavity to enhance fixation. At the same time, the inner surface of the sleeve is also provided with a recess, the shape of which matches the first pushing part. The first pushing part can be pushed into the recess, thereby limiting the sleeve and preventing the sleeve from moving downward.

[0016] Therefore, the technical solution of this application can improve the problem of insufficient stability after tibial plateau implantation in knee joint prostheses. Attached Figure Description

[0017] 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:

[0018] Figure 1 A schematic diagram of the tibial plateau is shown;

[0019] Figure 2 A schematic diagram of the tibial pad is shown;

[0020] Figure 3 A cross-sectional view of the tibial pad is shown;

[0021] Figure 4 A schematic diagram of the tibial plateau and sleeve assembly is shown;

[0022] Figure 5 A cross-sectional view of the tibial plateau and sleeve assembly is shown;

[0023] Figure 6 A schematic diagram of the sleeve is shown;

[0024] Figure 7 A cross-sectional view of the sleeve is shown;

[0025] The above-mentioned figures include the following reference numerals: 1. Tibial pad; 10. First fixing block; 11. First opening; 12. Second fixing block; 13. Second opening; 2. Tibial plateau; 20. Plateau support; 200. Third opening; 21. Outer shell; 210. Fourth opening; 211. Fifth opening; 22. Screw; 220. Sixth opening; 221. First thread; 222. Seventh opening; 223. First pushing part; 2230. First spring; 224. Second thread; 225. Second pushing part; 2250. Third thread; 2251. Groove; 226. Eighth opening; 3. Sleeve; 30. Fixing ring; 31. Third fixing block; 32. First connecting rod; 33. Second connecting rod; 34. Third connecting rod; 35. Fourth fixing block; 36. Fourth thread; 37. Recess; 38. Slide rail. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] like Figure 1-7As shown: A tibial plateau includes a tibial pad 1, on which a first fixing block 10 is provided. Three arc-shaped first openings 11 are evenly distributed inside the tibial pad 1, extending to the upper surface of the tibial pad 1. An arc-shaped second fixing block 12 is correspondingly disposed within each of the first openings 11, and the second fixing block 12 can move within the first openings 11. A circular second opening 13 is provided at the bottom of the tibial pad 1. A tibial plateau 2 is provided at the lower part of the tibial pad 1, and the tibial plateau 2 includes a platform support 20, a shell 21, and screws 22. A circular third opening 200 is provided in the middle of the platform support 20.The third opening 200 has the same diameter as the second opening 13. A shell 21 is provided at the lower part of the platform support 20. The shell 21 has a hollow structure. Three rectangular fourth openings 210 are evenly arranged on the side of the shell 21. A circular fifth opening 211 is provided at the bottom of the shell 21. A screw 22 is provided inside the shell 21. The screw 22 passes through the second opening 13 and the third opening 200 and is inserted into the shell 21. Three arc-shaped sixth openings 220 are evenly arranged on the upper part of the screw 22. The second fixing block 12 can be pushed into the sixth opening 220 from the first opening 11. A first thread 221 is provided on the outer surface of the screw 22. A rectangular thread 221 is provided on the side of the screw 22. The screw 22 has a seventh opening 222. Inside the screw 22, there is an arc-shaped first pushing part 223 that can extend out of the seventh opening 222. A first spring 2230 is connected to one end of the first pushing part 223 away from the seventh opening 222. The other end of the first spring 2230 is fixedly connected to the inner surface of the screw 22. The first spring 2230 can push the first pushing part 223 out of the seventh opening 222. A second thread 224 is provided on the inner surface of the screw 22. Inside the screw 22, there is a second pushing part 225. The upper part of the second pushing part 225 is cylindrical, and the lower part is conical. A third thread is provided on the upper outer surface of the second pushing part 225. The screw 22 has a third thread 2250 that meshes with the second thread 224. The lower part of the second pushing part 225 has multiple grooves 2251 evenly distributed. The bottom of the screw 22 has an eighth opening 226 through which the second pushing part 225 can extend. A sleeve 3 is fitted onto the outer surface of the screw 22. The inner surface of the sleeve 3 has a fourth thread 36 that meshes with the first thread 221. A circular slide rail 38 is provided on the sleeve 3, embedded in the upper part of the sleeve 3. When the sleeve 3 rotates, the slide rail 38 does not rotate. Three fourth fixing blocks 35 are evenly distributed on the slide rail 38. A third connecting rod 34 is hinged to the upper part of the sleeve 20. The head of the third connecting rod 34 is a triangular block. The third connecting rod 34 is hinged to a second connecting rod 33, and the second connecting rod 33 is hinged to a first connecting rod 32. The first connecting rod 32 is hinged to a third fixing block 31. The third fixing block 31 is located on the side of the fixing ring 30. The fixing ring 30 is sleeved on the outer surface of the screw 22. The upper part of the fixing ring 30 is connected and fixed to the platform support 20. A recess 37 is provided on the inner surface of the sleeve 3. The shape of the recess 37 is consistent with the shape of the first pushing part 223. The first pushing part 223 is pushed out of the seventh opening 222 by the first spring 2230 and inserted into the recess 37, thereby limiting the position of the sleeve 3.

[0030] like Figure 1 As shown, a tibial plateau prosthesis includes a tibial pad 1, a first fixing block 10 on the tibial pad 1, and a tibial plateau 2 at the lower part of the tibial pad 1. The tibial plateau 2 includes a plateau support 20, a shell 21, and a screw 22. The shell 21 has three rectangular fourth openings 210 evenly arranged on its side. The second connecting rod 33 and the fourth connecting rod 34 on the sleeve 3 can extend out from the fourth openings 210. The second pushing part 225 inside the screw 22 can extend out from the fifth opening 211 of the shell 21. The lower conical part of the second pushing part 225 has a groove 2251.

[0031] like Figure 2 As shown, a first fixing block 10 is provided on the upper part of the tibial pad 1. The first fixing block 10 is combined with the femoral condyle to enhance fixation. Three first openings 11 are evenly provided on the tibial pad 1. The first openings 11 are arc-shaped and extend into the interior from the upper surface of the tibial pad 1.

[0032] like Figure 3 As shown, the tibial pad 1 is provided with a first fixing block 10, and three first openings 11 are evenly provided on the tibial pad 1. The first openings 11 are arc-shaped, and arc-shaped second fixing blocks 12 are correspondingly provided in the first openings 11. The second fixing blocks 12 can slide in the first openings 11. The bottom of the tibial pad 1 is provided with a circular second opening 13.

[0033] like Figure 4 As shown, the tibial plateau 2 includes a plateau support 20 and a screw 22 inside. The screw 22 passes through the plateau support 20. Three sixth openings 220 are evenly arranged on the upper part of the screw 22. The sixth openings 220 are arc-shaped, allowing the second fixing block 12 to be pushed into the sixth openings 220 from the first opening 11. The outer surface of the screw 22 is provided with a first thread 221. A second pushing part 225 is provided inside the screw 22. Multiple grooves 2251 are evenly arranged on the lower conical part of the second pushing part 225. 2. An outer sleeve 3 is provided, and three fourth fixing blocks 35 are evenly arranged on the sleeve 3. A third connecting rod 34 is correspondingly hinged to the fourth fixing block 35. A second connecting rod 33 is hinged to the third connecting rod 34. A first connecting rod 31 is hinged to the second connecting rod 33. The first connecting rod 32 is hinged to the third fixing block 31. The third fixing block 31 is located on the side of the fixing ring 30. The fixing ring 30 is sleeved on the outside of the screw 22. At the same time, the upper part of the fixing ring 30 is connected and fixed to the platform support 20.

[0034] like Figure 5As shown, the tibial plateau 2 includes a plateau support 20 and a screw 22. The plateau support 20 has a through third opening 200 in its center. The screw 22 is inserted into the outer shell 21 through the third opening 200. The screw 22 is partially hollow. A first thread 221 is provided on the outer surface of the screw 22. A seventh opening 222 is provided on the side of the screw 22. An arc-shaped first pushing part 223 is provided inside the screw 22. A first spring 2230 is connected to one end of the first pushing part 223 away from the seventh opening 222. The other end of the first spring 2230 is connected and fixed to the inner surface of the screw 22. The first spring 2230 can push the first pushing part 223 out of the seventh opening 222. The screw 22 has a second thread 224 on its inner surface and a second pushing part 225 inside. The upper part of the second pushing part 225 is cylindrical and the lower part is conical. The upper part of the second pushing part 225 has a third thread 2250 that meshes with the second thread 224. The lower outer surface of the second pushing part 225 has grooves 2251 evenly distributed. The second pushing part 225 can extend out from the eighth opening 226 at the bottom of the screw 22. A sleeve 3 is sleeved on the outside of the screw 22. The inner surface of the sleeve 3 has a fourth thread 36 that meshes with the first thread 221. The sleeve 3 has a recess 37, and the first pushing part 223 can be pushed into the recess 37 for positioning.

[0035] like Figure 6 As shown, the sleeve 3 is provided with a slide rail 38, which is an annular ring. The slide rail 38 can slide inside the sleeve 3. The inner surface of the sleeve 3 is provided with an arc-shaped recess 37, which is consistent with the shape of the first pushing part 223. The inner surface of the sleeve 3 is provided with a fourth thread 36, which meshes with the first thread 221. Three fourth fixing blocks 35 are evenly arranged on the slide rail 38. A third connecting rod 34 is correspondingly connected to the fourth fixing block 35. A second connecting rod 33 is correspondingly connected to the third connecting rod 34. A first connecting rod 32 is correspondingly connected to the second connecting rod 33. The first connecting rod 32 is disposed on the third fixing block 31. The third fixing block 31 is disposed on the side of the fixing ring 30, which is an annular ring.

[0036] like Figure 7As shown, the sleeve 3 is provided with a slide rail 38, which is a circular ring. The slide rail 38 is embedded in the upper part of the sleeve 3 and can slide inside the sleeve 3. The inner surface of the sleeve 3 is provided with an arc-shaped recess 37, which is consistent with the shape of the first pushing part 223. The inner surface of the sleeve 3 is provided with a fourth thread 36. Three fourth fixing blocks 35 are evenly arranged on the slide rail 38. A third connecting rod 34 is hinged to the fourth fixing block 35. The head of the third connecting rod 34 is a triangular block. The third connecting rod 34 is hinged to a second connecting rod 33. The second connecting rod 33 is hinged to a first connecting rod 32. The first connecting rod 32 is hinged to a third fixing block 31. The third fixing block 31 is located on the side of the fixing ring 30.

[0037] When using this invention, the specific technical effects brought about by the embodiments are as follows: During surgery, the combination of the tibial plateau and the sleeve is first implanted. At this time, the sleeve is in a retracted state inside the outer shell of the tibial plateau. The first connecting rod, the second connecting rod, and the third connecting rod are retracted inside the outer shell, and the second pushing part is retracted inside the screw and does not protrude. After determining the implantation position, the screw is rotated. When the screw rotates, it drives the engaging sleeve to rotate and move upward. At this time, the slide rail on the sleeve moves upward with the sleeve. Since the slide rail can slide inside the sleeve, and the slide rail and connecting rod system are connected to the fixing ring, and the fixing ring is fixed to the plateau support, the slide rail does not rotate with the sleeve, but only moves upward with the sleeve. When the slide rail moves upward with the sleeve, the third connecting rod, the second connecting rod, and the first connecting rod on the slide rail are pushed and unfolded outward. The third connecting rod and the second connecting rod are gradually extended as they rise and extend into the medullary cavity through the fourth opening on the outer shell. At the same time, when the sleeve rises and touches the first pushing part... When the first pushing part is compressed into the screw, and the sleeve rotates to the position of the seventh opening recessed on the screw, the first spring pushes the first pushing part into the recess, forming a limiting effect on the sleeve. At this time, the connecting rod is also fully extended and inserted into the medullary cavity. When the screw rotates, the second rotating part inside the screw also rotates and moves downward. As the screw rotates, the second pushing part will extend out from the eighth opening at the bottom of the screw, and then gradually extend out from the fifth opening at the bottom of the outer shell and insert into the medullary cavity. When the sleeve rotates and rises to be limited, the lower part of the second rotating part also extends out from the screw and inserts into the medullary cavity. At this time, the screw has finished rotating. When revision of the prosthesis is required, the screw can be reversed to retract the connecting rod and the second pushing part to reduce the amount of bone pulled out. After the screw has finished rotating, the tibial pad is placed on the platform support, the first opening on the tibial pad is aligned with the sixth opening on the screw, and the second fixing block in the first opening is pushed into the sixth opening, thereby realizing the connection and fixation of the tibial pad and the tibial plateau.

[0038] In summary, by modifying the tibial plateau, this invention can enhance the stability of the tibial plateau in the medullary cavity, reduce the amount of bone pulled out during revision surgery, and enhance the overall stability between the tibial pad and the tibial plateau.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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 plateau prosthesis, characterized in that, include: Tibial pad (1), the bottom of the tibial pad (1) is provided with a second opening (13); Tibial plateau (2), wherein the tibial plateau (2) is disposed below the tibial pad (1), and comprises: Platform support (20), wherein a third through hole (200) is provided in the middle of the platform support (20). The outer shell (21) is a hollow shell with three fourth openings (210) evenly arranged on the side and a fifth opening (211) arranged at the bottom. A screw (22) is disposed inside the outer casing (21). The screw (22) is a partially hollow structure with an eighth opening (226) at the bottom. A first thread (221) is provided on the outer surface of the screw (22). A rectangular seventh opening (222) is provided on the side of the screw (22). An arc-shaped first pushing part (223) is provided inside the screw (22). The first pushing part (223) is connected to a first spring (2230). The first spring (2230) is far from... One end of the first pushing part (223) is connected to the inner surface of the screw (22). The first spring (2230) can push the first pushing part (223) to extend out of the seventh opening (222). The inner surface of the screw (22) is provided with a second thread (224). The screw (22) is provided with a second pushing part (225) inside. The outer surface of the second pushing part (225) is provided with a third thread (2250). The third thread (2250) and the second thread (224) mesh with each other. A sleeve (3) is fitted onto the outer surface of the screw (22). A circular slide rail (38) is provided on the sleeve (3), which is embedded inside the sleeve (3) and can slide within it. A recess (37) is provided on the inner surface of the sleeve (3), the shape of which matches the first pushing part (223). Three fourth fixing blocks (35) are evenly arranged on the slide rail (38), and a third connecting rod (34) is hinged to each fourth fixing block (35). The head of the third connecting rod (34) is provided with a triangular block. The third connecting rod (34) is hinged to the second connecting rod (33). The second connecting rod (33) is hinged to the first connecting rod (32). The first connecting rod (32) is hinged to the third fixing block (31). The third fixing block (31) is set on the fixing ring (30). The fixing ring (30) is sleeved on the outer surface of the screw (22). At the same time, the upper surface of the fixing ring (30) is connected and fixed to the platform support (20) to restrict the rotation of the slide rail (38).

2. The tibial plateau prosthesis according to claim 1, characterized in that, The tibial pad (1) is provided with a first fixing block (10) on the upper part. The tibial pad (1) is provided with three arc-shaped first openings (11) evenly arranged inside. The first openings (11) are provided with corresponding arc-shaped second fixing blocks (12). The diameter of the second openings (13) is the same as the diameter of the screw (22).

3. A tibial plateau prosthesis according to claim 2, characterized in that, The screw (22) has three arc-shaped sixth openings (220) evenly arranged inside, and the second fixing block (12) can be pushed into the sixth opening (220) from the first opening (11).

4. A tibial plateau prosthesis according to claim 1, characterized in that, The diameter of the third opening (200) on the platform support (20) is the same as the diameter of the screw (22), the third connecting rod (34) can extend from the fourth opening (210), and the second pushing part (225) of the screw (22) can extend from the fifth opening (211).

5. A tibial plateau prosthesis according to claim 1, characterized in that, The second pushing part (225) can extend out from the eighth opening (226). The upper part of the second pushing part (225) is a cylinder and the lower part is a cone. The surface of the lower cone of the second pushing part (225) is uniformly provided with grooves (2251).

6. A tibial plateau prosthesis according to claim 1, characterized in that, The inner surface of the sleeve (3) is provided with a fourth thread (36), which meshes with the first thread (221) on the screw (22).

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