Non-merging cervical vertebra intercalated disc prosthesis and assembly method thereof

Abstract

The invention relates to a non-merging cervical vertebra intercalated disc prosthesis and an assembly method thereof. The non-merging cervical vertebra intercalated disc prosthesis comprises an upperendplate and a lower endplate, wherein the lower endplate is a housing of which the upper end is not closed; a spherical cavity is formed in the housing; a spheroidal pulpy nucleus prepared from metaland rubber is arranged in the spherical cavity; a cross guide rail is vertically mounted in the middle part of the inner bottom of the housing; the lower end of the spheroidal pulpy nucleus is arranged on a guide rail in a sleeving manner; the upper endplate is located above the lower endplate; a C-shaped sleeving rod is arranged on the lower side surface of the upper endplate, and sleeves the outer surface of the spheroidal pulpy nucleus; and arc-shaped notches for giving ways to two ends of the C-shaped sleeving rod are arranged at the middle parts of the left side and the right side of theinner part of the spherical pulpy nucleus. The non-merging cervical vertebra intercalated disc prosthesis disclosed by the invention is simple in structure and reasonable in design, and the problem that in a conventional artificial cervical vertebra intercalated disc replacement technique, a common prosthesis cannot meet double requirements of cervical vertebra biological mechanics for an elasticity function and a moving function is solved.

Description

technical field [0001] The invention relates to a non-fused cervical intervertebral disc prosthesis and an assembly method thereof, belonging to the field of medical devices. Background technique [0002] The artificial intervertebral disc prosthesis currently used clinically is mainly a composite prosthesis. The first type is a combination of metal structure and metal structure, but the elastic modulus of the metal material is much higher than that of cortical bone, which may easily cause excessive stress on the artificial intervertebral disc and adjacent vertebral bodies, resulting in subsidence and loosening of the prosthesis Or prolapse, and the rigid connection of metal to metal cannot play the role of shock absorption and buffering, and loses the main function of buffering and shock absorption of the lumbar intervertebral disc. However, metal materials are still used to make artificial joint materials because of their fatigue resistance, high strength and good biocomp...

AI Technical Summary

Problems solved by technology

However, the polymer has low strength and poor wear resistance, which limits the service life of the prosthesis, and the particles produced by wear have certain toxicity and can cause local or systemic reactions.

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