Surface shoulder joint prosthesis

Abstract

The present invention belongs to the field of medical devices and discloses a surface shoulder joint prosthesis. The surface shoulder joint prosthesis comprises a humerus head prosthesis matched withshape of a human humerus head, a connecting rod formed on an inner surface of the humerus head prosthesis, and a broach detachably connected with the connecting rod, wherein an external thread sectionis formed on the connecting rod, an internal thread section matched with the external thread section and a first hollow section communicating with a tail end of the internal thread section are formedin the broach, and the external thread section of the connecting rod rotates to enter the first hollow section through the internal thread section and is contained and fixed in the first hollow section. The surface shoulder joint prosthesis can be firmly fixed with humerus sclerotin of human body, and has good stability and wide applicability at the same time.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a surface shoulder joint prosthesis. Background technique [0002] Traditional artificial shoulder arthroplasty includes humeral head replacement and artificial total shoulder arthroplasty, both of which require the removal of the entire humeral head and installation of a prosthesis, while surface shoulder arthroplasty only grinds away a part of the humeral head. The remainder of the head is covered with a surface shoulder prosthesis that conforms to the shape of the humeral head. [0003] The structure of the existing surface shoulder joint prosthesis includes the humeral head prosthesis adapted to the shape of the humeral head prosthesis and the medullary needle formed on the inner surface of the humeral head prosthesis. A hole is opened on the humeral head for installing the medullary needle, and the medullary needle of the surface shoulder joint prosthesis is aligned...

AI Technical Summary

Problems solved by technology

[0004] Although the existing surface shoulder joint prosthesis can meet the needs of patients, in actual use, it is found that the medullary needle and the human humerus are in a tapered press-fit fit. When the prosthesis is implanted into the human body and used for a long time, there is a risk of tapered press-fit failure. Once the taper press fit fails, it will cause the prosthesis to be free in the human body and may cause nerve cutting

At the same time, the humeral head prosthesis and the medullary needle are integrally formed, and the size of the humeral head prosthesis or the medullary needle is not suitable for the same patient.

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