Wrist joint prosthesis

Abstract

The invention discloses a wrist joint prosthesis which can be implanted within an injured wrist joint to replace the injured wrist joint. The wrist joint prosthesis includes a wrist joint intramedullary pin (1), wherein one end of the wrist joint intramedullary pin (1) is fixed on the metacarpal bone, and the other end thereof is connected with an interfacing (3); the interfacing (3) is provided with a spherical bulge (32); one end of a radius intramedullary pin (4) is fixed on the radius, and the other end thereof is provided with a spherical groove (41); the spherical groove (41) partially surrounds the bulge (32) of the interfacing (3); the interfacing (3) can rotate in the groove (41) through the bulge (32) and further movably rotate relative to the radius intramedullary pin (4); the radius intramedullary pin (4) can rotate relative to the wrist joint intramedullary pin (1) through the interfacing (3). With the wrist joint prosthesis provided by the invention, the bending, stretching, spreading, withdrawing and circumduction movements of the wrist joint are recovered, and the prosthesis conforms to the physiology of the wrist joint, so that the patient can move freely as usual; as the wrist joint prosthesis intramedullary pin is matched with the wrist joint interfacing, the wrist joint prosthesis has the characteristics of being safe and flexible, simple to mount, stable in structure and high in dislocation resistance.

Description

technical field [0001] The invention relates to an artificial joint prosthesis, in particular to a wrist joint prosthesis for replacing a diseased wrist joint. Background technique [0002] The wrist joint, also known as the radiocarpal joint, is a typical elliptical joint, with the proximal articular surfaces of the scaphoid, lunate, and triquetrum as the joint head, and the carpal articular surface of the radius and the articular disc below the ulnar head as the joints formed by a nest. The joint capsule is loose, and the front, back and sides of the joint are reinforced by ligaments, of which the palmar ligament is the toughest, so the extension of the wrist is limited. [0003] The radiocarpal joint can perform flexion, extension, extension, retraction and circular movement. The wrist joint is the most complex joint in the human body. Many diseases or traumas can cause chronic pain and loss of function of the wrist joint, such as rheumatoid arthritis, trauma Arthritis,...

AI Technical Summary

Problems solved by technology

The current treatment mainly includes wrist fusion, and there is no artificial wrist prosthesis to replace joint activities

[0004] The wrist joint needs to be installed and fixed accurately, and the osteotomy position needs to be matched during installation, otherwise excessive wear and bone resorption will occur. For those who need a large amount of radius amputation, the wrist joint cannot be replaced

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