3-D shoulder joint prosthesis

Abstract

The invention relates to a novel three-dimension shoulder joint artificial prosthese, formed by a spherical cap element 1, a handle 3, an incline element (bar wedge 4 and arc block 6), and a torsion element (round plate 2 and cylinder block). The invention realizes the three-dimension design of shoulder joint, via tooth meshed, and uses incline element to realize the incline angle adjustment between 115 degrees and 140 degrees, and uses the torsion element to realize the torsion angle adjustment between -20 degree and +20 degrees, uses the eccentric design of spherical cap element 1 to meet the demand of eccentric distance of head of humerus, while the eccentric distances are 2.5mm, 3.5mm, and 4.0mm, uses the detachable arrangement of incline element and torsion element to confirm the repeatable adjustment of parameters. And the rod 9 of handle has plum blossom section to avoid the handle being rotated in the marrow. The invention is characterized in the large adjustment range of prosthese parameters with repeatable adjusting ability. The invention has simple structure, high reliability and simple operation.

Description

technical field [0001] The invention relates to an artificial shoulder joint prosthesis, in particular to an artificial shoulder joint prosthesis whose shoulder joint parameters can be adjusted three-dimensionally. Background technique [0002] Typically, artificial shoulder prostheses are used for overused or injured shoulders with wear and arthritis, joint pain, stiffness, and limited joint motion, and heat therapy, rest, exercise, and medication do not relieve the pain, especially It is a total or hemi-shoulder replacement for a comminuted fracture of the humeral head. Total shoulder replacement is to replace the damaged humeral head with a prosthesis on the humeral side, and replace the damaged glenoid bone with a polymer-lined prosthesis. Hemi-shoulder arthroplasty refers to the replacement of the humeral side only when the humeral side is severely comminuted and the glenoid bone is intact. The patient's humeral head is resected and a metal humeral head prosthesis is i...

AI Technical Summary

Problems solved by technology

[0003] The most widely used shoulder joint prosthesis is the Univers3-D shoulder joint prosthesis invented by Germany's Peter Habermeyer, which uses pins to drive in and expand to achieve positioning. The disadvantage of this positioning method is that once the pins are driven in, if the position of the humeral head is adjusted If the position of the humeral head differs from the patient's own, the parameters of the prosthesis cannot be readjusted, leading to the failure of the prosthesis. The inclination angle of the articular surface of the proximal humerus of this shoulder joint prosthesis ranges from 125° to 140°, and the articular surface of the disintegrated humerus is reversed backwards and forwards. The angle range is +15° to -15°, which limits the anatomical parameters of the humerus in some patients, and increases the incidence of postoperative complications if shoulder replacement surgery is performed

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