Hinge type interphalangeal joint prosthesis

Abstract

The invention relates to the technical field of medical prostheses, and provides a hinge type interphalangeal joint prosthesis. The hinge type interphalangeal joint prosthesis comprises a near-end broach, a far-end broach, a phalanx head, a phalanx platform and a rotating screw, wherein the phalanx platform is inserted into the phalanx head and is hinged to the phalanx head through the rotating screw; a cylindrical main body structure is arranged on the phalanx platform and the tail part of the far end of the phalanx head; a square outline and a circular outline at the tail end are arranged on the cylindrical main body structure; a transition groove is formed between the square outline and the circular outline at the tail end; and a rubber ring is in sleeving to the transition groove. The hinge type interphalangeal joint prosthesis has the beneficial effects that the rubber ring between the phalanx platform and the far-end broach and the rubber ring between the phalanx head and the near-end broach have certain elasticity, large stress can be avoided when the finger is in a bent state or is subjected to external force, and an effect of a buffer strip is performed; and in addition, the square outline can increase a limiting effect, and the round outline can facilitate fixation of the rubber rings in the broaches.

Description

technical field [0001] The invention relates to the technical field of medical prosthesis, in particular to a hinged interphalangeal joint prosthesis. Background technique [0002] At present, joint replacement of large joints such as hips, knees, elbows, and ankles has become increasingly mature, while small joint replacements such as metacarpophalangeal joints are still in the initial stage of development. People suffering from small arthritis, rheumatoid arthritis, and joint deformities in my country mostly do not accept joint replacement surgery. The key reason is that there are almost no domestic knuckle prostheses in China, while imported products are expensive, far exceeding acceptable to the general public. Due to the complex structure of the metacarpophalangeal joints, chronic pain, stiffness, and deformity of the joints lead to weakening or loss of hand function, and knuckle prosthesis replacement is indeed the most effective way to relieve joint pain and improve j...

AI Technical Summary

Problems solved by technology

[0004] However, the structure of the knuckle prosthesis in the existing patent has the following defects: (1) after the joint part of the proximal prosthesis, the head of the joint part and the rotation shaft are matched, it does not conform to the physiological structure of the human interphalangeal joint; (2) the joint There is a gap fit between the tail of the component and the head of the distal prosthesis, which is prone to extrusion or falling off when subjected to external force; (3) All components need to be reassembled during each operation, which is too cumbersome; cannot be combined

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