CN115317203A

Movatterモバイル変換

Info

Publication number: CN115317203A
Application number: CN202210932420.8A
Authority: CN
Inventors: 朱雄卫; 岳术俊; 许奎雪; 刘曙光; 刘雅卿
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2022-11-11

Abstract

The invention discloses a bicompartmental knee joint prosthesis, which belongs to the technical field of medical prosthesis and comprises bicompartmental femoral condyles, a tibial gasket and a tibial tray; the double compartment femoral condyle mainly comprises a unilateral condyle joint surface and a femoral condyle anterior condyle surface; the middle position of the anterior condyle surface of the femoral condyle is provided with a patellar sliding groove; the unilateral condyle joint surface is connected with the femoral condyle anterior condyle surface and has an integrated structure; the tibia liner is matched with the tibia support through a clamping groove structure, and the combination of the tibia liner and the tibia support is positioned on the outer side of the unilateral condyle articular surface; the inner surface of the double-compartment femoral condyle and the bottom of the tibial tray are provided with a groove and a fixing upright post, wherein the groove is used for enhancing the bonding strength of bone cement and human bones, and the fixing upright post is used for being inserted into human bones to ensure the connection stability. The invention avoids the excision of anterior and posterior cruciate ligaments and collateral ligaments in the knee joint, and retains the functions of the ligaments of the knee joint body of a patient; reduce the adverse reaction of the physiological activities of the patients after the operation.

Description

Double-compartment knee joint prosthesis

Technical Field

The invention relates to the technical field of medical prostheses, in particular to a bicompartmental knee joint prosthesis.

Background

The correct specification of the knee joint prosthesis, namely the morphological size, has very important significance for the successful replacement and long-term survival of the artificial total knee joint, and because the morphological difference between different races is large, a commercial prosthesis may not have a prosthesis component which is suitable for the specifications of Chinese people, when the existing device is used, the fixing effect after installation is poor, the prosthesis is easy to loosen to cause the failure of the prosthesis and even the injury of a user, and the specifications and structures of human joints are different.

The bicompartmental knee prosthesis in the prior art can not simultaneously solve patellar arthritis and unicondylar joint inflammation; and has resection damage to ligaments at the knee joint site during knee prosthesis replacement.

Disclosure of Invention

In view of the above, the present invention provides a bicompartmental knee prosthesis, which avoids the excision of anterior and posterior cruciate ligaments and collateral ligaments in the knee joint, and retains the function of the patient's knee joint body ligament; reduce the adverse reaction of the physiological activities of the patients after the operation.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a bicompartmental knee joint prosthesis comprises a bicompartmentalfemoral condyle 1, atibial gasket 2 and atibial tray 3; the double compartment femoral condyle mainly comprises a unilateral condyle joint surface and a femoral condyle anterior condyle surface; the middle position of the femoral condyle anterior condyle surface is provided with a patellar sliding groove; the unilateral condyle joint surface is connected with the femoral condyle anterior condyle surface and has an integrated structure;

the tibia liner is matched with the tibia support through a clamping groove structure, and a combination of the tibia liner and the tibia support is positioned on the outer side of the unilateral condyle articular surface;

the inner surface of the double-compartment femoral condyle and the bottom of the tibial tray are provided with a groove and a fixing upright post, wherein the groove is used for enhancing the bonding strength of bone cement and human bones, and the fixing upright post is used for being inserted into human bones to ensure the connection stability.

Further, the double compartment femoral condyle is made of cobalt-chromium-molybdenum alloy.

Further, the material of the tibial gasket is VE high cross-linked ultra-high molecular weight polyethylene.

Further, thetibial tray 3 is made of titanium alloy.

Furthermore, the curvature of the patellar sliding groove is the same as the physiological curvature of the human femoral condyle articular surface.

Furthermore, a locking protrusion is arranged on the lower surface of the tibia liner, and a locking groove is arranged on the upper surface of the tibia support; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial gasket, and the same side of the locking groove is provided with a horizontal groove corresponding to the extension; the tibia liner is inserted from one side of the femur support, and under the locking state of the tibia liner and the femur support, the tibia liner extends to be positioned in the horizontal groove.

Furthermore, the curvature of the unilateral condyle joint surface is the same as the physiological curvature of the human femur condyle joint surface.

The invention adopts the technical scheme to produce the beneficial effects that:

1. in the technology, the design of the double-compartment femoral condyle aims to solve the problem that a patient suffers from patellar osteoarthritis and unilateral femoral condyle osteoarthritis, the existing total knee joint replacement scheme is replaced, and replacement repair is carried out on the patellar and unilateral femoral condyle.

2. The structural design of the double-compartment femoral condyle, the tibial gasket and the tibial tray in the technology can be used for performing operation treatment on a patient, so that the resection of anterior and posterior cruciate ligaments and collateral ligaments in the knee joint is avoided, and the function of the ligament of the knee joint body of the patient is kept.

3. In the technology, the unilateral condyle articular surface and the patella pulley groove in the double-compartment femoral condyle are designed according to the human femoral condyle biological design, so that the adverse reaction of the physiological activities of a patient after operation is reduced.

4. In the technology, the assembly relation of the bicompartmental femoral condyle, the tibial gasket and the tibial tray is metal-polyethylene-metal, so that the abrasion between the metal and the metal is reduced, the tibial gasket is made of VE high-crosslinked polyethylene, the abrasion resistance and the biocompatibility are better, and the service life of the prosthesis is prolonged.

5. In the technology, thelocking groove 31 and thelocking protrusion 21 are designed to slide in one side, so that the assembly mode reduces the difficulty of a doctor in assembly and reduces the damage to the tibial gasket of the polyethylene part in the assembly process.

6. The setting of fixed stand and recess in this technique promotes the stable intensity of prosthesis when bone cement is fixed.

Drawings

FIG. 1 is a schematic view of an installation structure of an embodiment of the present invention;

FIG. 2 is an exploded view of the structure of an embodiment of the present invention;

FIG. 3 is a schematic view of the second viewing angle configuration of FIG. 2;

fig. 4 is a schematic diagram of a third viewing angle structure of fig. 2.

Fig. 5 is a schematic view of the tibial insert of fig. 2.

Fig. 6 is a schematic view of the tibial tray of fig. 2.

In the figure: 1. bicompartmental femoral condyles, 2, tibial liners, 3, tibial trays, 14, patellar trochlear grooves, 11, 33, grooves, 12, 32, fixation posts, 31, locking grooves, 21, locking protrusions, 13, unilateral condylar articular surfaces, 22, extensions, 34, horizontal grooves.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

A bicompartmental knee joint prosthesis comprises a bicompartmentalfemoral condyle 1, atibial gasket 2 and atibial tray 3; the bicompartmental femoral condyle mainly comprises a unilateral condyle joint surface and a femoral condyle anterior condyle surface; the middle position of the femoral condyle anterior condyle surface is provided with a patellar sliding groove; the unilateral condyle joint surface is connected with the femoral condyle anterior condyle surface and has an integrated structure;

the inner surface of the double-compartment femoral condyle and the bottom of the tibial tray are respectively provided with a groove and a fixing upright post, wherein the groove is used for enhancing the bonding strength of bone cement and human bones, and the fixing upright post is used for being inserted into human bones so as to ensure the connection stability.

Further, thetibial tray 3 is made of titanium alloy.

Furthermore, a locking protrusion is arranged on the lower surface of the tibia liner, and a locking groove is arranged on the upper surface of the tibia support; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial gasket, and the same side of the locking groove is provided with a horizontal groove corresponding to the extension; the tibia liner is inserted from one side of the femur support, and extends and is positioned in the horizontal groove under the locking state of the tibia liner and the femur support.

The following is a more specific example:

referring to fig. 1 to 6, the present embodiment is composed of a bicompartmentalfemoral condyle 1, atibial gasket 2 and atibial tray 3, as shown in fig. 1 to 4. Thefemur component 1 is made of cobalt chromium molybdenum alloy, thetibia liner 2 is made of VE high cross-linking ultra-high molecular weight polyethylene, and thetibia support 3 is made of titanium alloy.

The bicompartmentalfemoral condyle 1 is designed according to the biological characteristics of the femur of the knee joint of the Chinese, the unilateralcondyle joint surface 13 and thepatella sliding groove 14 conform to the physiological curvature of the human femoral condyle joint surface, and all ligaments of the knee joint can be reserved in the operative osteotomy;

the method comprises the following steps of performing osteotomy operation on a patient femoral condyle according to the inner surface structure of a prosthesis, punching the femoral condyle, smearing bone cement on the inner surface of the bicompartmental femoral condyle, installing the bone cement on the patient femoral condyle, strengthening the bonding strength of the bone cement and human bones through the design of agroove 11, and ensuring the stability of the prosthesis after implantation through a fixedupright post 12;

the tibia of the patient is cut and punched according to the structural design of thetibia support 3, thetibia support 3 with a proper model specification is selected through a test mould, and the installation stability of thetibia support 3 on the tibia of a human body is ensured through the design of thelower surface groove 33 and the fixingupright post 32;

after selecting a propertibial tray 3, selecting atibial gasket 2 with proper thickness according to a test mould, and assembling and locking the tibial gasket through the locking convexgroove 21 and thelocking groove 31;

and (3) smearing bone cement on the lower surface of thetibial tray 3, implanting the locked tibial platform into the tibia of the patient to complete prosthesis implantation, and performing surgical suture subsequently.

Referring to fig. 5 to 6, the lower surface of the tibial gasket is provided with a locking projection, and the upper surface of the tibial tray is provided with a locking groove; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial gasket, and the same side of the locking groove is provided with a horizontal groove corresponding to the extension; the tibia liner is inserted from one side of the femur support, and extends and is positioned in the horizontal groove under the locking state of the tibia liner and the femur support.

The bone trabecula structure can be increased through the 3D printing technology to the two-compartmentfemoral condyle 1, the tibia support lower surface, the service life of the prosthesis is prolonged through the self-growing of human bones, and the problems of allergy and particles possibly brought by bone cement fixation are avoided.

Claims

1. A bicompartmental knee prosthesis is characterized by comprising a bicompartmental femoral condyle (1), a tibial gasket (2) and a tibial tray (3); the double compartment femoral condyle mainly comprises a unilateral condyle joint surface and a femoral condyle anterior condyle surface; the middle position of the femoral condyle anterior condyle surface is provided with a patellar sliding groove; the unilateral condyle joint surface is connected with the femoral condyle anterior condyle surface and has an integrated structure;

2. The bicompartmental knee prosthesis of claim 1, wherein the material of the bicompartmental femoral condyle is cobalt chromium molybdenum alloy.

3. The bicompartmental knee prosthesis of claim 1, wherein the material of said tibial insert is VE high cross-linked ultra-high molecular weight polyethylene.

4. A bicompartmental knee prosthesis according to claim 1, characterized in that the material of the tibial tray (3) is a titanium alloy.

5. The bicompartmental knee prosthesis of claim 1, wherein the curvature of the patellar trochlear groove is the same as the physiological curvature of the human femoral condyle articular surface.

6. A bicompartmental knee prosthesis according to claim 1, wherein the lower surface of the tibial gasket is provided with a locking projection, and the upper surface of the tibial tray is provided with a locking groove; one side of the locking protrusion is provided with an extension parallel to the lower surface of the tibial gasket, and the same side of the locking groove is provided with a horizontal groove corresponding to the extension; the tibia liner is inserted from one side of the femur support, and under the locking state of the tibia liner and the femur support, the tibia liner extends to be positioned in the horizontal groove.

7. The bicompartmental knee prosthesis of claim 1, wherein the curvature of said unilateral condyle articular surface is the same as the physiological curvature of the human femoral condyle articular surface.