Dual Sliding Field Tibial Plateau Base and Spacer System

Abstract

The present invention provides a double sliding field tibial platform base and gasket system, including a platform base and a gasket, wherein the platform base includes an upper platform and a lower keel, wherein two high dividing ridges are arranged in the middle of the platform from front to back, and the platform is divided into three parts: a central groove, an inner sliding field, and an outer sliding field, and the gasket is divided into a central gasket, an inner gasket, and an outer gasket, which are matched with the three parts of the platform, and the above structure is matched with an artificial femoral prosthesis to form an artificial joint interface in which both the inner chamber and the outer chamber are slidable and rotatable. The system can form a joint interface that can move flexibly in the inner and outer joint compartments after knee replacement, while retaining the front-back stability, dispersing and reducing the wear rate of the inner and outer compartments of the knee joint, improving the movement characteristics of the knee joint, improving the surgical effect, and extending the service life of the prosthesis.

Description

Technical Field

[0001] The invention belongs to the technical field of slidable interfaces of the medial and lateral compartments of the femoral-tibial joint, in particular to a double-sliding-field tibial plateau base and gasket system. Background Art

[0002] As an effective means of treating end-stage knee diseases, total knee replacement has achieved good results. However, most of the currently available total knee prostheses are fixed platform designs, which means that the femoral tibial joint surface formed is a single flexion and extension movement, and rotation, sliding and other movements are not allowed, resulting in increased stress and wear on the joint interface, leading to prosthesis loosening and surgical failure. A small number of existing rotating platform designs have a column below the platform gasket inserted into the tibial platform base, which can rotate to a certain extent, but there is no other lateral, anterior and posterior movement, which also restricts the effect. At present, there is a lack of slidable total knee prostheses. Summary of the invention

[0003] The purpose of the present invention is to provide a double sliding field tibial plateau base and gasket system, which can form a flexible joint interface in the medial and lateral joint compartments after knee replacement, while retaining the anterior-posterior stability, dispersing and reducing the wear rate of the medial and lateral compartments of the knee joint, improving the movement characteristics of the knee joint, improving the surgical effect, and extending the service life of the prosthesis.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A double sliding field tibial platform base and gasket system includes a platform base and a gasket. The platform base includes an upper platform and a lower keel. Two high dividing ridges from front to back are arranged in the middle of the platform, dividing the platform into three parts: a central groove, an inner sliding field and an outer sliding field. The gasket is divided into a central gasket, an inner gasket and an outer gasket, which match the three parts of the platform. The above structure is matched with an artificial femoral prosthesis to form an artificial joint interface in which the inner compartment and the outer compartment are both slidable and rotatable.

[0006] A double sliding field tibial plateau base and gasket system, wherein the double sliding field tibial plateau base is made of metal or alloy, and the gaskets are divided into a central gasket, an inner gasket and an outer gasket, all of which are made of ultra-high molecular weight polyethylene material. The double sliding field tibial plateau base is composed of an upper platform and a lower keel, and the platform is designed in an asymmetrical anatomical shape, the inner part is larger than the outer part, the front side is a convex arc edge, and the rear side is a concave arc edge; the edges around the platform are raised outer edges; there are two high-rise dividing ridges from front to back in the middle to divide the platform into three parts: a central groove, an inner sliding field and an outer sliding field, and the inner sliding field and the outer sliding field are highly polished and smooth surfaces. The bottoms of the four boundaries of the central groove are respectively concave to form shallow grooves around. The keel is a cylindrical structure, with a side wing extending at an angle of 45° to the side and rear, and two oblique ridges arranged obliquely on the left and right sides of the side wing, and a longitudinal ridge protruding longitudinally in front of the keel. The head of the keel is cylindrical, and two holes are opened on the head. The central gasket is divided into a head and a bottom. The side view of the head is thumb-like, with a blunt top, an arc convex to the front at the back, and an arc at the front. The front of the bottom is slightly higher than the back, the upper part of the front of the bottom is a slope, and there are shallow grooves around the bottom of the bottom. The left and right diameters of the bottom of the bottom are equal to the left and right diameters of the shallow grooves at the bottom of the platform central groove. The side view of the inner and outer gaskets is a saddle-shaped structure, with a certain curvature on the upper surface, a smooth surface on the lower surface, a slope on the upper part of the front, and a slight curvature on the inner and outer sides. The top view is rectangular with blunt corners.

[0007] The double sliding field tibial plateau base and gasket system as described above, wherein the double sliding field tibial plateau base is made of metal or alloy, and the gasket is made of ultra-high molecular weight polyethylene material.

[0008] As described above, the double sliding field tibial plateau base and gasket system, the double sliding field tibial plateau base platform is an asymmetric anatomical design, with the medial portion being larger than the lateral portion.

[0009] As described above, the double sliding field tibial plateau base and gasket system has two high separation ridges from front to back in the middle of the double sliding field tibial plateau base platform.

[0010] As described above, the double sliding field tibial plateau base and gasket system, the medial sliding field and the lateral sliding field of the double sliding field tibial plateau base platform are highly polished smooth surfaces.

[0011] As described above, the double sliding field tibial plateau base and gasket system, the four boundary bottoms of the central groove of the double sliding field tibial plateau base platform are respectively recessed to form shallow grooves.

[0012] In the double sliding field tibial plateau base and gasket system as described above, the keel is a cylindrical structure with side wings extending at an angle of 45° to the rear.

[0013] In the double sliding field tibial plateau base and gasket system as described above, the left and right sides of the keel flanks are each provided with two oblique ridges arranged obliquely.

[0014] The double sliding field tibial plateau base and spacer system as described above, wherein the front of the keel has a longitudinal ridge protruding longitudinally.

[0015] As described above, the double sliding field tibial plateau base and gasket system, the keel head is cylindrical and has two holes.

[0016] As described above, the double sliding field tibial plateau base and gasket system, the side of the head of the central gasket has a thumb-like appearance, the top is rounded and blunt, the rear is an arc convex to the front, and the front is an arc.

[0017] As described above, the double sliding field tibial plateau base and gasket system, the front side of the bottom of the central gasket is slightly higher than the rear side, and the upper part of the front side of the bottom is an inclined surface.

[0018] As described above, the double sliding field tibial platform base and gasket system has shallow grooves around the bottom of the central gasket, and the left and right diameters of the bottom are equal to the left and right diameters of the shallow grooves at the bottom of the platform central groove boundary.

[0019] As described above, the double sliding field tibial plateau base and gasket system, the medial gasket and the lateral gasket are saddle-shaped structures when viewed from the side, with a certain curvature on the upper surface and a smooth surface on the lower surface.

[0020] The double sliding field tibial plateau base and gasket system described above has an upper front portion of the medial gasket and the lateral gasket being an inclined surface, and the medial and lateral sides being slightly curved.

[0021] In the double sliding field tibial plateau base and gasket system as described above, the medial gasket and the lateral gasket are rectangular in top view with rounded corners.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are as follows: the dual sliding field tibial plateau base and gasket system of the present invention is convenient to use, simple to operate, and novel and reasonable in design. The medial gasket and the lateral gasket can slide forward and backward in the medial and lateral sliding fields respectively, and can move inward and outward to a certain extent and rotate to a certain extent, so that the pressure generated in the medial and lateral compartments can be reduced and dispersed to a large extent, and the volume wear rate and linear wear rate of the medial and lateral compartments of the knee joint can be reduced. The upper surfaces of the medial gasket and the lateral gasket are concave in shape, matching the medial and lateral condyle articular surfaces of the femoral prosthesis, contact matching within the range of motion of the knee joint, and avoiding point contact; the lower surface is a horizontal smooth surface, which produces a very small friction coefficient with the high-polished surfaces of the medial and lateral sliding fields, largely avoiding the generation of wear debris, and obtaining an excellent long-term retention rate; the front and rear upper surfaces of the medial gasket and the lateral gasket are slightly raised to avoid the possibility of anterior and posterior dislocation of the gasket, and the oblique notch on the front upper surface avoids the stimulation of the anterior soft tissue during knee flexion. The cam-post structure formed by the head of the central gasket and the intercondylar beam of the femoral prosthesis can improve the medial and lateral and anterior-posterior stability of the knee prosthesis and replace the function of the cruciate ligament. The thumb-shaped structure behind the head of the central gasket can avoid point contact, reduce gasket wear and increase knee joint mobility. The oblique notch on the front and upper part of the central gasket avoids stimulation of the anterior soft tissue during knee flexion. The bottom of the central gasket can be stably inserted into the central groove to avoid micro-motion and reduce wear. The upper part of the keel has side wings facing the lateral rear, oblique ridges arranged obliquely on the side wings, longitudinal ridges in front of the keel, and two holes in the head of the keel, which can increase the fixation strength of bone cement on the double sliding field tibial plateau base and improve the mid- and long-term fixation effect.

[0023] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0025] Figure 1 It is a schematic diagram of the overall exploded structure of a specific embodiment of the dual sliding field tibial plateau base and gasket system of the present invention;

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the double sliding field tibial plateau base of the present invention;

[0027] Figure 3 is a top view of the dual sliding field tibial plateau base of the present invention;

[0028] Figure 4 It is a schematic diagram of the decomposed structure of the gasket of the present invention;

[0029] Figure 5is a side view of the central gasket of the present invention;

[0030] Figure 6 is a side view of the inner gasket of the present invention;

[0031] Figure 7 It is a front cross-sectional structural schematic diagram of the dual sliding field tibial plateau base and gasket system of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Total knee replacement is an effective method for treating end-stage knee diseases. Most of the existing total knee prostheses are fixed platform designs, and a small number are rotating platforms. The fixed platform design will lead to increased wear of the femoral prosthesis and the polyethylene joint surface, causing the prosthesis to loosen, while the rotating platform design only allows a certain degree of rotation around the column. Currently, there is a lack of slidable total knee prostheses. In order to solve such problems, the present invention designs a double sliding field tibial plateau base and gasket system, which can form a slidable joint surface for the medial compartment and the lateral compartment while obtaining anterior-posterior stability, thereby reducing interface friction and extending the service life of the prosthesis.

[0034] The implementation of the present invention is described in detail below with reference to the accompanying drawings by way of specific embodiments:

[0035] like Figure 1 , 2 As shown, this embodiment proposes a double sliding field tibial platform base and gasket system, including a platform base 100 and a gasket 200, the platform base 100 is made of metal or alloy, and the gasket 200 is divided into three parts: a central gasket 201, an inner gasket 202 and an outer gasket 203, all of which are made of ultra-high molecular weight polyethylene material.

[0036] refer to Figure 2 , 3 As shown, the double sliding field tibial plateau base 100 is divided into an upper platform 101 and a lower keel 102. The platform 101 is designed in a "broad bean-shaped" asymmetrical anatomical shape, with the inner part larger than the outer part, the front side having a convex arc edge, and the rear side having a concave arc edge; the edges of the platform 101 are surrounded by raised outer edges 103; and there are two raised dividing ridges 104 from front to back in the middle, which divide the platform into three parts: a central groove 105, an inner sliding field 106, and an outer sliding field 107. The inner sliding field 106 and the outer sliding field 107 are highly polished and smooth surfaces. The four boundary bottoms of the central groove 105 are respectively concave to form shallow grooves 108 on all sides.

[0037] like Figure 7 As shown, the keel 102 is cylindrical, with a side wing 109 extending 45° to the rear, two oblique ridges 110 arranged obliquely on the left and right sides of the side wing 109, and a longitudinal ridge 111 protruding longitudinally in front of the keel. The head of the keel is cylindrical, with two holes 112 opened in the head.

[0038] refer to Figure 4 , 5 As shown, the central gasket 201 is divided into a head and a bottom. The side of the head has a thumb-like appearance, with a rounded top and an arc-shaped rear that convexly faces the front. The front of the bottom is slightly higher than the rear, and the upper part of the front of the bottom is an inclined surface. Shallow grooves 204 are opened around the bottom of the bottom. The left and right diameters of the bottom of the bottom are equal to the left and right diameters of the shallow groove 108 at the bottom of the platform central groove boundary.

[0039] like Figure 4 , 6 As shown, the inner gasket 202 and the outer gasket 203 are saddle-shaped structures when viewed from the side, with a certain curvature on the upper surface, a smooth surface on the lower surface, an inclined surface on the upper front side, and slight curvature on the inner and outer sides; they are rectangular when viewed from the top, with rounded corners.

[0040] This embodiment uses an implant device to implant a double sliding field tibial plateau base and a gasket system into the knee joint, which matches the artificial femoral prosthesis, and can form an effect in which both the medial and lateral compartments are movable friction interfaces, which can effectively reduce interface wear and extend the service life of the prosthesis.

[0041] When applying, refer to Figure 1 , 7 , use the implantation instrument to prepare the bone surface on the femoral side, use the tibial side preparation instrument to perform horizontal osteotomy of the tibial plateau perpendicular to the force line of the lower limb, and obtain the tibial plateau osteotomy surface. Place the tibial plateau trial mold and the femoral prosthesis trial mold, and the stability and mobility of the knee joint are good after reduction test. Place the tibial plateau base 100 on the tibial plateau osteotomy surface, and use the keel rasp that matches the keel shape of the double sliding field tibial plateau base to knock into the double sliding field tibial plateau base trial mold to prepare the keel. Mix the bone cement, apply the dough-stage bone cement to the tibial plateau osteotomy surface and the back of the double sliding field tibial plateau base 100, knock into the proximal tibia, and place the femoral prosthesis. Push the central gasket 201 obliquely backward and downward into the central groove 105 of the double sliding field tibial plateau base until the back, and knock the front of the central gasket so that the bottom of the central gasket is embedded in the shallow groove at the bottom of the central groove boundary. Then, the inner gasket 202 and the outer gasket 203 of suitable height are pushed into the inner sliding field 106 and the outer sliding field 107 respectively. The knee joint is reset, and the stability and mobility of the knee joint and the gasket are tested. The placement process is completed.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual sliding field tibial plateau base and gasket system, comprising a platform base and a gasket, characterized in that: The platform base includes an upper platform and a lower keel. Two high dividing ridges are provided in the middle of the platform from front to back, dividing the platform into three parts: a central groove, an inner sliding field, and an outer sliding field. The gasket is divided into a central gasket, an inner gasket, and an outer gasket, which match the three parts of the platform. The above structure is matched with an artificial femoral prosthesis to form an artificial joint interface in which both the inner compartment and the outer compartment are slidable and rotatable. The platform of the double sliding field tibial platform base is a "broad bean-shaped" asymmetrical anatomical design, the medial part is larger than the lateral part, the front side is a convex arc edge, and the rear side is a concave arc edge; The edges of the platform are raised outer edges; The bottoms of the four boundaries of the central groove are respectively recessed to form shallow grooves; The keel is a cylindrical structure, with a side wing extending 45° to the rear at the upper part, two oblique ridges arranged obliquely on the left and right sides of the side wing, and a longitudinal ridge protruding longitudinally in front of the keel; The head of the keel is cylindrical, and has two holes; The central gasket is divided into a head and a bottom, the side of the head is thumb-like in appearance, the top is round and blunt, the rear is an arc convex to the front, and the front is an arc; The front side of the bottom of the central gasket is slightly higher than the rear side, the upper part of the front side of the bottom is an inclined surface, and shallow grooves are opened around the bottom of the bottom. The left and right diameters of the bottom of the bottom are equal to the left and right diameters of the shallow grooves at the bottom of the platform central groove boundary; The inner gasket and the outer gasket are saddle-shaped structures when viewed from the side, with a certain curvature on the upper surface, a smooth surface on the lower surface, an inclined surface on the upper front side, and slight curvature on the inner and outer sides; they are rectangular when viewed from the top with rounded corners.

2. The dual sliding field tibial plateau base and spacer system according to claim 1, characterized in that: The inner sliding field and the outer sliding field of the platform are highly polished smooth surfaces.

3. The dual sliding field tibial plateau base and spacer system according to claim 1, characterized in that: The double-sliding-field tibial plateau base is made of alloy, and the gaskets are all made of ultra-high molecular weight polyethylene material.

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