Artificial cervical disc prosthesis

Abstract

The invention relates to a semi-restricted artificial cervical disc prosthesis conforming to the natural motion pattern of the human cervical disc and well conforming to the anatomical shape of the human spinal structure. The artificial cervical disc prosthesis comprises an upper end plate, a nucleus pulposus and a lower end plate, wherein the lower surface of the upper end plate and the upper surface of the nucleus pulposus form a cup-and-ball joint, and the lower surface of the nucleus pulposus attaches to the upper surface of the lower end plate and forms a grabbing-type movable fit mechanism with the lower end plate. The cup-and-ball joint is composed of the spherical groove formed in the lower surface of the upper end plate and a spherical dome projecting out of the upper surface of the nucleus pulposus, so that the upper end plate realizes the free movement in six directions, including forward bending / backward extending, left lateral bending / right lateral bending, and left rotation / right rotation relative to the nucleus pulposus. The grabbing-type movable fit mechanism is composed of the lower surface of the nucleus pulposus and the upper surface of the lower end plate, so that the nucleus pulposus can move towards the front, rear, left and right directions on the upper surface of the lower end plate and rotate towards a central shaft, and has small possibility of escaping out.

Description

technical field [0001] The invention relates to the field of orthopedic implants, in particular to a semi-restricted artificial cervical intervertebral disc prosthesis conforming to the natural motion pattern of the human cervical intervertebral disc. Background technique [0002] Cervical intervertebral disc prosthesis products include Bryan, Prestige LP, Prodisc-C, PCM, CerviCore, Mobi-C, Discover and many other imported products, but the main performance parameters of these products are designed based on the bone size of foreign populations , not suitable for the bone size of the Chinese population. Most of the domestic artificial cervical disc prosthesis designs are based on the profiling structure design based on the size of foreign products. The main performance parameters of the product, such as the front height, middle height, rear height, and footprint size of the cervical intervertebral space, have not been compared with the bone size of Chinese people. After deta...

AI Technical Summary

Problems solved by technology

[0003] CN103315830 B discloses a Ω-shaped artificial cervical intervertebral disc implant prosthesis with herringbone bidirectional anti-regression and inverted teeth. The Ω-shaped non-contact elastic structure with the upper and lower end plates of the prosthesis replaces the traditional spherical and saddle surface bearing structure Author Horseshoe-shaped shrapnel structure, the outer surface of the upper and lower end plates is equipped with herringbone-shaped two-way back and forth teeth anchored with the upper and lower vertebrae, which improves the surface stress state of the prosthesis and vertebral body to prolong the life and resist fatigue. The prosthesis relies on the integration of the upper and lower end plates. The load-bearing capacity and impact energy absorption capacity of the Ω-shaped non-contact elastic structure are used to restore and maintain the height of the intervertebral space, maintain segmental stability, and retain the flexion, extension, and compression shock absorption functions of the intervertebral disc. The disadvantages are: the The prosthesis is an integrated structure, which cannot rely on its own structure to achieve axial rotation and normal movement of the human spine

[0004] CN204839838 U discloses a kind of artificial cervical intervertebral disc prosthesis, and structure comprises: upper endplate, lower endplate and be located at the wear-resistant nucleus pulposus between upper endplate and lower endplate, have rotation, flexion and extension, translation three-dimensional six-dimensional The range of free space can satisfy the normal cervical motion function of the human body and solve the problems in the prior art. The disadvantages are: the nucleus pulposus is fixed on the lower endplate, and the center of rotation is fixed.

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