A combined organic polymer material artificial knee joint

Abstract

A combined organic polymer material artificial knee joint, including femoral condyle and tibial support of polyetheretherketone (PEEK) or its derivatives and tibial liner of ultra-high molecular weight polyethylene (UHMWPE), wherein the tibial support includes a platform and The positioning part of the stabilizer wing perpendicular to it; the upper end and the lower end of the tibial liner are respectively engaged with the femoral condyle and the platform; the femoral condyle has a buffer for the sliding surface of the tibial liner; The sliding surface against the tibial liner matches the fretting of the tibial tray against the tibial liner. The main parts of all implant parts of the present invention are made of polymer materials, which reduces the allergies and toxicity problems that metals and their corrosion may cause; the elastic modulus of PEEK matches the natural bone, which reduces the stress shielding problem; the PEEK femoral condyle and The tibial tray combines the sliding surface and the fixed surface of the UHMWPE tibial liner with micro-movement, which greatly reduces the wear problem. At the same time, the reinforcement and development parts are added to further improve the practicality.

Description

technical field [0001] The invention relates to a medical rehabilitation device, more specifically, to a combined organic polymer material artificial knee joint. 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 operation. Therefor...

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.

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