Tibial plateau and matching tool thereof

Abstract

The invention provides a knee joint prosthesis tibial plateau capable of enhancing fixation and a tool matched with the tibial plateau, the knee joint prosthesis tibial plateau specifically comprises a tibia support, the tibia support is of a hollow cylinder structure, and three convex bodies are fixedly arranged on the outer surface of the tibia support; a groove penetrating into the tibia support is formed in the abutment, and the abutment is fixedly arranged on the tibia support; the pushing device comprises extension rods arranged at the two ends of a worm, the worm with threads arranged on the outer surfaces of the two ends, turbines arranged on the two sides of the worm, upper supporting bodies arranged at the tops of the turbines and connected with the fixing device through first connecting bodies, and lower supporting bodies arranged at the bottoms of the turbines and connected with the fixing device. The fixing device is a hollow cone, a first spring is arranged in the fixing device, one end of the first spring is connected with the first connector, and the other end of the first spring is connected with a fixing block. According to the technical scheme, the technical problem that after the knee joint prosthesis is implanted into the tibia, the tibial plateau is unstable, the prosthesis is loosened and disengaged, and then bone fusion is affected is effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, in particular to a tibial plateau and a matching tool thereof. Background Art

[0002] The knee joint is a critical weight-bearing joint in the lower limb. Degenerative knee osteoarthritis is a common disease among the elderly. For severe knee disease, knee replacement surgery is indicated as a treatment option to achieve long-term and stable improvement in knee function. Currently, purely mechanical knee prostheses are widely used in knee replacement surgery to relieve pain, correct deformities, and restore joint function. As a key load-bearing component of the knee prosthesis, the tibial plateau prosthesis's long-term stability directly determines the success rate of the surgery and the lifespan of the prosthesis.

[0003] Traditional tibial plateau prostheses are usually fixed to the proximal tibial bone bed through two methods: bone cement fixation or biological fixation (non-bone cement fixation). However, regardless of the fixation method, current tibial plateau prostheses still face some challenges and limitations. The long-term stability of biologically fixed prostheses depends on the initial mechanical stability in the early stage. If the initial stability is not good, the micro-motion will exceed the critical value, causing fibrous tissue rather than bone tissue to grow into the pores, forming a fibrous membrane, and eventually causing aseptic loosening, which is the main cause of failure of knee replacement surgery. At the same time, once aseptic loosening occurs, revision surgery is required. Although the porous-coated prosthesis that is firmly bonded to the bone avoids the problem of bone cement removal, the removal process itself will cause a huge bone defect, which brings great challenges to subsequent reconstruction.

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

[0005] The main purpose of the present invention is to provide a tibial plateau to solve the problem of insufficient stability of the tibial plateau after a knee joint prosthesis is implanted into a human body.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a tibial platform for enhanced fixation and its supporting tools, specifically including: a tibial tray, which is a hollow cylindrical structure with an open bottom, and three convex bodies are fixedly provided on the outer surface of the hollow cylindrical structure; a base, a groove is provided on the base, the groove passes through the interior of the tibial tray, and the base is fixedly provided on the tibial tray; a pushing device, the pushing device is arranged inside the tibial tray, and includes: an extension rod arranged at both ends of the worm, a worm with opposite threads on the outer surfaces of both ends, a turbine arranged on both sides of the worm, the turbine surface is a gear, which engages with the worm thread, the turbine contacts the tibial tray through the cylinder to form a rotatable connection, an upper support body arranged at the top of the turbine and connected to the fixing device through a first connector, and a lower support body arranged at the bottom of the turbine to form a hinge connection with the fixing device; the fixing device is a hollow cone, a first spring is provided inside, one end of the first spring is vertically movably connected to the first connector, and the other end is connected to the fixing block, and at the same time, barbs are provided on the outer surface of the bottom of the fixing device to enhance fixation.

[0007] Furthermore, the outer surface of the tibial tray is sprayed with a nano-coating to enhance bone adsorption capacity.

[0008] Furthermore, the base is circular, has three protruding devices on it, and has two rectangular grooves on it, and the distance between the grooves is consistent with the length of the worm structure.

[0009] Furthermore, the extension rod in the pushing device is a rectangular parallelepiped, and two symmetrical rectangular grooves are provided on the left and right sides of the middle.

[0010] Furthermore, the upper support body in the pushing device includes a first upper support rod and a second upper support rod, which are connected by a hinge, wherein the second upper support rod is vertically connected to the first connecting body.

[0011] Furthermore, the lower support body in the pushing device is composed of support rods that are symmetrically arranged on the left and right sides, and the lower support body is hinged to the fixing device through a first limiting device.

[0012] Furthermore, the connection points of the upper support body and the lower support body in the propulsion device on the turbine are located on the same diameter of the turbine and are at the same distance from the center of the circle.

[0013] Furthermore, the fixing device also includes a second connector, which is hingedly connected to the fixing device via a second limiting device and to the tibial tray via a third limiting device.

[0014] Furthermore, the second connecting body includes an upper connecting rod and a lower connecting rod, which are connected by a hinge.

[0015] Furthermore, the top of the fixing device is consistent in size and shape with the circular opening structure at the bottom of the hollow cylinder of the tibial tray. The fixing block connected to the first spring on the fixing device is a triangular pyramid with a porous surface and a surface reinforcement device with a barbed structure.

[0016] According to another aspect of the present invention, an adjustment tool is provided for adjusting the pushing device in the above-mentioned tibial plateau, the adjustment tool comprising: a clamping structure with identical left and right structures, the upper part of the clamping structure being connected by a second spring and connected by a hinge in the middle, the lower part being a bent shape, the lower end being a rectangular body matching the rectangular groove structure, the overall width of the clamping structure matching the rectangular groove, and the length being half of the extension rod.

[0017] Applying the technical solution of the present invention, the tibial platform includes a base, a tibial tray, a propulsion device and a fixing device, the base is fixedly arranged above the tibial tray, and three protrusions and two grooves passing through the tibial tray are arranged on the base; the propulsion device is placed inside the tibial tray, the upper part of the extension rod extends into the groove, and the bottom is fixed to the two ends of the worm, and the outer surfaces of the two ends of the worm are provided with threads in opposite directions; the turbine engages with the gear on the worm through the surface gear, and contacts the tibial tray through the cylinder in the middle of the turbine to form a rotatable connection; an upper support body is provided at the top of the turbine, and the upper support body includes a first and a second upper support rod, and the two support rods are connected by a hinge, wherein the second support rod is vertically connected to the first connecting body, and the first connecting body serves as a limiter for the upper support body; a lower support body is provided at the lower part of the turbine, which forms a hinge connection with the fixing device, thereby pushing the fixing device to move downward. The fixture is a hollow cone with a first spring symmetrically positioned within it. One end of the first spring is vertically movably connected to the first connector, while the other end is connected to a triangular pyramidal fixing block that pushes the fixing block out of the fixture. A reinforcement device is also provided on the outer surface of the bottom of the fixture to enhance fixation. Therefore, the technical solution of this application effectively enhances the stability of the tibial plateau within the tibial medullary cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 shows the overall assembly diagram of the tibial plateau; Figure 2 The overall structure diagram of the pushing device is shown; Figure 3 An overall cross-sectional view of the tibial plateau is shown; Figure 4 A schematic diagram showing the connection between the second upper support rod and the first connecting body is shown; Figure 5A tool structure diagram is shown; Among them, the above-mentioned drawings include the following figure marks: 1. tibial support; 10. third limiting device; 11. convex body; 2. base; 20. groove; 21. protruding device; 3. pushing device; 30. extension rod; 300. groove; 31. worm; 310. thread; 32. turbine; 320. cylinder; 33. upper support body; 330. first upper support rod; 331. second upper support rod; 34. first connecting body; 340. connecting block; 35. lower support body; 350. first limiting device; 4. fixing device; 40. first spring; 41. fixing block; 42. reinforcement device; 43. second connecting body; 430. second limiting device; 431. upper connecting rod; 432. lower connecting rod; 5. clamping structure; 51. second spring; 52. hinge. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] like Figure 1-3 The figure shows a tibial plateau, comprising a tibial tray 1, which is a hollow cylindrical structure with an open bottom, and three convex bodies 11 are fixedly provided on the outer surface of the hollow cylindrical structure; a base 2, which is provided with a groove 20, which passes through the inside of the tibial tray; a pushing device 3, which is provided inside the tibial tray 1, and comprises: an extension rod 30 provided at both ends of a worm, a worm 31 with threads 310 in opposite directions provided on the outer surfaces of both ends, and a turbine 32 provided on both sides of the worm, the turbine surface being a gear that meshes with the worm thread, and the turbine passes through the cylinder 3 20 contacts the tibial tray to form a rotatable connection, an upper support body 33 is arranged at the top of the turbine and connected to the fixing device 4 through a first connector 34, the upper support body includes a first support rod 330 and a second support rod 331, and a lower support body 35 is arranged at the bottom of the turbine and connected to the fixing device 4 to form a hinge connection; the fixing device 4 is a hollow cone, and a first spring 40 is arranged inside, one end of the first spring is vertically movably connected to the first connector 34, and the other end is connected to a fixing block 41, and a reinforcement device 42 is provided on the outer surface of the bottom of the fixing device to enhance the fixation. When in use, the tibial plateau is implanted, first clamp the extension rod, rotate the extension rod to drive the worm gear to rotate, the rotation of the worm gear drives the meshing turbine to rotate, the rotation of the turbine drives the upper support body to move upward, and the upper support body moves upward to drive the first connecting body to move upward; at the same time, the rotation of the turbine drives the lower support body to move downward, and the lower support body moves downward to push the fixing device as a whole to move downward, and when the fixing device moves downward, it extends from the tibial tray and inserts into the tibial medullary cavity, and the upward-moving first connecting body drives the first spring and the fixing block inside the fixing device to move upward; until the two support rods of the upper support body are connected in a straight line, at this time the first connecting body restricts the upper support body from continuing to move upward, and the lower support body no longer pushes the fixing device to move downward, and the first connecting body drives the fixing block to extend from the fixing device and insert into the tibial medullary cavity, and the triangular vertebral fixing block can enhance the stability in the medullary cavity, and at the same time, the top of the fixing device and the bottom of the tibial tray fit together to form a whole, thereby enhancing the overall rigidity of the tibial plateau.

[0023] like Figure 1 As shown, three protrusions 21 are provided on the top of the base, which can enhance the stability with the tibial pad and enhance the overall stability of the knee joint prosthesis.

[0024] like Figure 2 As shown, rectangular grooves 300 are symmetrically provided on the left and right sides of the middle of the extension rod 30 to facilitate cooperation with the clamping structure 5.

[0025] like Figure 3As shown, the fixing device 3 is hingedly connected to the tibial support 1 through a second connector, and the second connector is hingedly connected to the second limiting device 430 and the third limiting device 10. After the fixing device is moved downward as a whole, the upper connecting rod 431 and the lower connecting rod 432 in the second connector are connected in a straight line to avoid the biomechanical forces generated during movement that push the fixing device back and cause the overall fixing effect to be weakened. At the same time, the fixing device and the tibial support are connected as a whole to enhance the overall tibial platform rigidity.

[0026] like Figure 4 As shown, the first connector 34 is located at the left end of the second upper support rod 331, and can play a limiting role during the movement of the upper support body, restricting further upward movement, and thereby restricting the continued activity of the entire pushing device; at the same time, during surgical revision, the connecting block 340 can drive the first spring 40 and the fixing block 41 in the fixing device to retract during the downward movement of the first connector, which can effectively reduce the amount of bone brought out.

[0027] like Figure 5 As shown, the upper part of the clamping structure 5 is connected by a second spring 51 and is connected by a hinge 52 in the middle. The lower part is a bent shape, and the lower end is a rectangular body that matches the rectangular groove 300 structure. The clamping structure 5 extends from the groove 20 on the base 2 into the tibial support 1, clamps the rectangular groove, pushes the extension rod to rotate, and drives the entire device to move, effectively improving the efficiency of the operation.

[0028] In order to further improve the stability of the prosthesis, a barbed-shaped reinforcement device 42 is provided at the bottom of the fixing device to increase the overall stability; secondly, a porous structure is provided on the surface of the fixing device to promote bone ingrowth; at the same time, a nano-coating is provided on the surface of the tibial tray to promote the ingrowth of bone cells and enhance the stability of the prosthesis.

[0029] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0030] For ease of description, spatially relative terms such as "above," "on the upper surface of," "on top of," etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would then be positioned as "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tibial plateau, characterized in that: include: A tibial tray (1), the tibial tray being a hollow cylindrical structure with an open bottom, and three convex bodies (11) being fixedly provided on the outer surface of the hollow cylindrical structure; A base (2), wherein a groove (20) is provided on the base, the groove extends to the interior of the tibial tray (1), and the base is fixedly arranged on the tibial tray (1); A pushing device (3), which is arranged inside the tibial tray and comprises: An extension rod (30) is provided at both ends of the worm (31). A worm (31), wherein the outer surfaces of both ends of the worm are provided with threads (310) in opposite directions. The turbines (32) on both sides are gears, meshing with the worm screw threads (310), and the turbines are in contact with the tibial support via the cylinder (320) to form a rotatable connection. An upper support body (33), the upper support body being arranged at the top of the turbine, the upper support body being connected to the fixing device (4) via a first connecting body (34), A lower support body (35), which is arranged at the bottom of the turbine and is hingedly connected to the fixing device (4); A fixing device (4) is a hollow cone, wherein a first spring (40) is provided inside the fixing device, one end of the first spring is vertically movably connected to the connecting block (340), and the other end is connected to the fixing block (41), and a reinforcing device (42) is provided on the outer surface of the bottom of the fixing device.

2. The tibial plateau according to claim 1, characterized in that: The base (2) is circular and has three protruding devices (21) on it. The base also has two rectangular grooves (20), the distance between the grooves being consistent with the length of the worm structure, and the surface of the tibial tray is sprayed with a nano coating.

3. The tibial plateau according to claim 1, characterized in that: The extension rod (30) in the pushing device (3) is a rectangular parallelepiped, with two symmetrical rectangular grooves (300) provided on the left and right sides of the middle portion.

4. The tibial plateau according to claim 1, characterized in that: The upper support body (33) in the pushing device (3) comprises a first upper support rod (330) and a second upper support rod (331), which are connected via a hinge, wherein the second upper support rod (331) is vertically connected to the first connecting body (34).

5. The tibial plateau according to claim 1, characterized in that: The lower support body (35) is composed of support rods that are symmetrically arranged on the left and right sides. The lower support body (35) is hingedly connected to the fixing device (4) via a first limiting device (350).

6. The tibial plateau according to claim 1, characterized in that: The connection points of the upper support body (33) and the lower support body (35) on the turbine are located on the same diameter of the turbine and are at the same distance from the center of the circle.

7. The tibial plateau according to claim 1, characterized in that: The fixing device (4) further comprises a second connector (43), the second connector (43) being hinge-connected to the fixing device (4) via a second limiting device (430) and to the tibial support (1) via a third limiting device (10).

8. The tibial plateau according to claim 1, characterized in that: The top of the fixing device (4) is consistent in size and shape with the circular opening structure at the bottom of the hollow cylinder of the tibial support. The fixing block (41) connected to the first spring (40) is a triangular cone with a porous surface. The surface reinforcement device (42) of the fixing device is a barbed structure.

9. A tool for use with the tibial plateau according to any one of claims 1 to 8, characterized in that: It comprises a clamping structure (5) with the same left and right structures, wherein the upper portion of the clamping structure is connected via a second spring (51) and is connected via a hinge (52) in the middle, the lower portion is bent, and the lower end is a rectangular body that matches the rectangular groove (300) structure, the overall width of the clamping structure matches the rectangular groove (20), and the length is half of the extension rod (30).

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