Joint prosthesis

Abstract

The invention provides a joint prosthesis which comprises a humerus head prosthesis, a hollow screw and a gasket; the humerus head prosthesis is provided with a protruding part, the protruding part is provided with a through screw hole, the hollow screw is pressed on the surface of sclerotin through the gasket, and the hollow screw penetrates through a bone to be matched with the screw hole. After the reversed hollow screw is connected with the humerus head, a pull-down force is applied, so that the humerus head is tightly attached to the surface of the near end of the humerus, and later falling is prevented. The matched gasket is in threaded connection with the humerus head, the humerus head is firmly pressed on the surface of the near end of the humerus, and the falling risk of the humerus head is reduced.

Description

technical field [0001] The invention relates to a medical device, in particular to a joint prosthesis. Background technique [0002] At present, surface shoulder joint replacement is often performed for patients with osteoarthritis. The prosthesis generally consists of the frontal humeral head covering the surface of the humerus and the medullary needle implanted in the medullary cavity of the proximal humerus. The medullary needle implanted into the medullary cavity is generally divided into bone cement type and biological type prosthesis. The bone cement type needs to be fixed with bone cement, and the surface of the biological type medullary needle is generally coated with titanium powder. [0003] Bone cement-type medullary nails are suitable for patients with osteoporosis, and biological-type medullary needles are suitable for patients with good bone quality. However, as a primary replacement operation, bone cement prosthesis is not suitable, and the bone cement in the...

AI Technical Summary

Problems solved by technology

However, as a primary replacement operation, bone cement prosthesis is not suitable, and the bone cement in the medullary cavity is not easy to clean up in revision surgery; and after the bio-type medullary needle is implanted in the medullary cavity, the cortical bone layer of the proximal humerus can be combined with titanium powder The combination is firm, but the ingrowth effect of the cancellous bone titanium powder in the lower layer is not very good, and the lower layer is basically hollow, and the stability in the later stage is only in contact with the cortical bone layer near the end, and the firmness is poor

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