Welded type ceramic artificial elbow joint

Abstract

The invention discloses a welded type ceramic artificial elbow joint, which comprises a humerus prosthesis and an ulna prosthesis, wherein the humerus prosthesis and the ulna prosthesis are connectedwith a shaft arranged in a shaft barrel through the shaft barrel; the shaft and the shaft barrel are arranged in a relatively rotating manner; convex ceramic sheets are welded on the outer surface ofthe shaft; the ceramic sheets are a set of ceramic sheets which are dispersedly arranged; the outer surface of the ceramic sheets is contacted with the inner surface of the shaft barrel to form a friction pair. The welded type ceramic artificial elbow joint has the advantages of reasonable structural design, the ceramic sheets are distributed on the shaft, so that the friction between the metal and the high molecular polymer is converted into the friction between the ceramic and the metal; a gap is formed between the ceramic sheets to contain lubricating liquid, so that the friction coefficient of the humerus prosthesis and the ulna prosthesis is reduced, the abrasion amount is reduced, and the metal ion precipitation is reduced; at the same time, the cracking risk of the ceramic prosthesis can be reduced; the mass of the elbow joint is reduced, so that the motion of the patient is lighter.

Description

technical field [0001] The invention relates to the technical field of biomedical engineering orthopedic implant prostheses, in particular to a welded ceramic artificial elbow joint. Background technique [0002] Artificial elbow replacement is an effective clinical treatment for elbow injuries caused by trauma or disease. The artificial elbow joint system consists of a humeral prosthesis and an ulnar prosthesis. As a biomaterial used in artificial elbow prosthesis, it should not only achieve a good repair effect, relieve the pain of patients, restore the function of the elbow joint, but more importantly, it should not have adverse effects on the tissues around the human elbow joint. [0003] Common elbow prosthesis consists of metal humeral prosthesis and metal ulnar prosthesis or polymer ulnar prosthesis. The humeral prosthesis and the ulnar prosthesis constitute a pair of friction pairs. The types of artificial elbow joints currently used clinically are metal humeral p...

AI Technical Summary

Problems solved by technology

During the long-term friction and wear process of the friction pair formed by this pairing, toxic metal ions will be precipitated, which will accumulate to a certain concentration in the human body and cause chronic diseases. At the same time, the wear debris will induce osteolysis of the bone tissue around the prosthesis; The friction pair formed by this matching pair makes the wear rate of the polymer prosthesis very high. The most commonly used polymer material is ultra-high molecular weight polyethylene, and its annual wear is about 0.1-0.2mm. During the long-term friction process, it will The thickness of the polymer is continuously reduced, which in turn affects the strength of the prosthesis

In addition, there is another type of artificial elbow prosthesis: ceramic humeral prosthesis paired with polymer or metal ulnar prosthesis, which has good wear resistance, very little wear, and no metal ions However, due to the inherent fragility of the ceramic itself, the ceramic prosthesis is easily broken. It is still in the laboratory research stage and has no clinical application.

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