Support-type ceramic artificial elbow joint

Abstract

The invention discloses a support-type ceramic artificial elbow joint. The support-type ceramic artificial elbow joint comprises a humeral prosthesis, an ulnar prosthesis, a shaft, and a connector arranged on the shaft. The shaft is arranged at one end of the humeral prosthesis; a set of protruding ceramic sheets are dispersedly arranged and embedded on the titanium alloy collector; a sleeve is arranged at one end of the ulnar prosthesis; the outer surfaces of the ceramic sheets contact with the inner surface of the sleeve to form friction pairs. Or, a groove is formed in the outer surface ofthe shaft, and the connector is arranged in the groove; the shaft is arranged at one end of the humeral prosthesis, a set of protruding ceramic sheets are dispersedly arranged on the connector, the connector is of a high molecular polyethylene cylinder, and the ceramic sheets are molded on the high molecular polyethylene cylinder; a sleeve is arranged at one end of the ulnar prosthesis, and the outer surfaces of the ceramic sheets contact with the inner surface of the sleeve to form friction pairs. The support-type ceramic artificial elbow joint has the advantages that abrasion, the risk of ceramic breakage and metal ion release are reduced, and the service life of the elbow joint is prolonged.

Description

technical field [0001] The invention relates to the technical field of biomedical engineering orthopedic implant prostheses, in particular to a bracket type 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 hum...

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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