All-trans wrist joint prosthesis retaining function of distal radioulnar joint

Abstract

An all-trans wrist joint prosthesis retaining the function of a distal radioulnar joint comprises a carpal bone base, a carpal bone joint fossa, a movable ball and a radial handle, and a wrist bone marrow needle is arranged on the carpal bone base; the carpal joint fossa is connected with the carpal base through a connecting plate; the movable ball body is of an elliptical hemispheroid structure matched with the lower surface of the carpal joint fossa; the movable ball body is connected with the radius handle through the radius connecting plate, the radial bone marrow needle and the ulna bone marrow needle are arranged below the radius handle, a lock hole is formed in the upper surface of the ulna bone marrow needle, a limiting lock catch is arranged below the radius handle, and the ulna bone marrow needle is connected to the limiting lock catch through the lock hole. The defects in the prior art are overcome, and a larger movement range is obtained through the design of the reverse wrist joint; and through the detachable design of the carpal joint fossa and the movable ball body, the material cost for rebuilding is greatly reduced, and meanwhile, the angle of the prosthesis joint surface can be adjusted, so that the optimal palmar inclination angle and the optimal ulnar deflection angle can be conveniently adjusted, and the error-tolerant rate of osteotomy in an operation is improved.

Description

technical field [0001] The invention relates to daily necessities for human beings, in particular to medical equipment, in particular to an all-trans wrist joint prosthesis retaining the function of the inferior radioulnar joint. Background technique [0002] The wrist joint is one of the most flexible and complex joints in the human body. It mainly consists of four interrelated joints, the radiocarpal joint, the inferior radioulnar joint, the intercarpal joint, and the carpus metacarpal joint. At present, factors such as trauma, infection, rheumatism, and tumors can cause severe damage to the wrist joint clinically, ranging from pain and functional limitation to severe cases of complete loss of wrist joint function. The main treatment methods for such diseases are arthrodesis and artificial wrist replacement. [0003] Wrist joint replacement is the use of artificial joint prosthesis to replace the diseased joint. While solving the patient's pain, joint stiffness or deformi...

AI Technical Summary

Problems solved by technology

However, in clinical work, the existing wrist prosthesis mainly has the following problems: 1. The adjustment of palmar inclination and ulnar deviation angle when the wrist prosthesis is installed can only be realized by the amount of osteotomy

2. The prosthesis that simulates the normal wrist joint structure will reduce the range of motion to a certain extent after being implanted in the human body

3. Existing prostheses ignore the function of the DRUJ

The contact movement between the prosthesis and the ulna will lead to a more limited range of motion of the wrist joint; although some scholars have solved this problem by cutting off part of the distal ulna, they have basically abandoned the function of the DRUJ

4. The traditional two-part carpal joint prosthesis, on the one hand, cannot realize the circular movement of the radiocarpal joint, and on the other hand, it is difficult to repair the joint in the later stage

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