Combined fully organic high molecular material artificial knee joint

Abstract

A combined fully organic high molecular material artificial knee joint comprises a femoral condyle, a tibia bracket and a tibia pad; the femoral condyle and the tibia bracket are made of PEEK or derivatives of PEEK; the tibia pad is made of UHMWPE. The tibia bracket comprises a platform and a stable wing positioning portion perpendicular to the platform. The upper and lower ends of the tibia pad are combined with the femoral condyle and the platform respectively. The femoral condyle has a buffering function for the sliding face of the tibia pad. The tibia bracket can finely move relative to the fixed face of the tibia pad. The sliding face of the tibia pad relative to the femoral condyle is matched with fine motion of the tibia bracket relative to the tibia pad. The main parts of all implant components are made of high molecular materials, and the problems of irritability and virulence possibly caused by metal and corrosion of metal are solved. The elasticity modulus of the PEEK is matched with that of natural bones, and stress shielding is relieved. The sliding face and fixed face fine motion of the tibia pad made of UHMWPE from the femoral condyle and the tibia bracket made of the PEEK are combined, so that abrasion is greatly reduced. Meanwhile, enhancement and developing components are additionally arranged, so that the practicability is further improved.

Description

technical field [0001] The invention relates to a medical rehabilitation device, more specifically, to a combined artificial knee joint made of all organic polymer materials. Background technique [0002] Since total knee arthroplasty was applied clinically in the 1970s, the materials of implants are basically composed of cobalt-chromium-molybdenum (CoCrMo) alloy and ultra-high molecular weight polyethylene (UHMWPE). The design of the knee prosthesis mainly includes two interfaces, one of which is the fixed interface, and the other is the sliding surface of the articular surface. The prosthesis is generally directly fixed to the bone through bone cement or bone ingrowth, and the tibial component has been transformed from the polyethylene liner in the 1970s to the 1980s to the currently used modular (Modular). Modern knee replacement requires doctors to be able to grasp the patient's soft tissue balance, and to adjust the thickness of the tibial pad in time during the operat...

AI Technical Summary

Problems solved by technology

[0005] Therefore, so far, the clinically used knee prostheses are all made of metal materials, especially CoCrMo alloys. The above-mentioned polymer materials have not been practically used due to a series of shortcomings.

However, due to the structural characteristics of the knee joint, the tibial tray bears the greatest load. It has never been used or mentioned in clinical practice or literature that other materials can be used for the tibial tray.

Images