Artificial cervical intervertebral disc

Abstract

The invention relates to an artificial cervical intervertebral disc, which comprises an upper bottom plate, a lower bottom plate and a nucleus pulposus arranged between the upper bottom plate and the lower bottom plate, wherein the nucleus pulposus consists of an upper nucleus pulposus and a lower nucleus pulposus; the upper nucleus pulposus is provided with a convex cylinder; the lower nucleus pulposus is used for allowing an arc-shaped dovetail groove to be nested with the convex cylinder; the upper nucleus pulposus and the lower nucleus pulposus are mutually buckled; the upper bottom plate and the upper nucleus pulposus are cooperated and rotate around a coronal axis so as to simulate the fore flexion and back extension function of the cervical intervertebral disc; the upper bottom plate and the upper nucleus pulposus are permitted to generate front and back relative micro translation; the upper nucleus pulposus and the lower nucleus pulposus are cooperated, can rotate around the rotation axis of the self convex cylinder of the upper nucleus pulposus and also can perform revolution around the rotary track of the arc-shaped dovetail groove of the lower nucleus pulposus; the lower nucleus pulposus and the lower bottom plate are cooperated, and rotate around a sagittal axis to bear motor functions of left and right lateral curvature; and the lower bottom plate and the lower nucleus pulposus are permitted to generate left and right relative micro translation. According to the cervical intervertebral disc prosthesis disclosed by the invention, different construction members of the cervical intervertebral disc prosthesis are permitted to mutually move, and a rotation center in the moving process is coincident with the rotation center of cervical spine segmental physiological movement, so that the natural physiological state of the cervical vertebra can be furthest restored.

Description

technical field [0001] The invention relates to a prosthesis implanted into a human body, in particular to an artificial cervical intervertebral disc used to replace a diseased intervertebral disc in the cervical spine to decompress the cervical intervertebral space, maintain the height of the cervical intervertebral space and restore its normal physiological function. Background technique [0002] CN 201010003132.1 discloses "an artificial intervertebral disc of the cervical spine". Its purpose is to provide a simple structure and adopt a three-in-one structure, so that the prosthesis has a three-dimensional six-degree-of-freedom space activity range of rotation, flexion and extension, and translation, which meets the requirements of normal human body. The movement function of the cervical vertebra solves the problem of the cervical artificial intervertebral disc in the prior art. The technical scheme comprises: an upper endplate, a lower endplate, and a wear-resistant nucl...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the position of the nucleus pulposus of the cervical intervertebral disc is variable during the relative motion of the cervical segment, that is, it can provide an instantaneously variable center of rotation

However, the center of rotation of the above-mentioned prosthesis is fixed, so it does not meet the requirements of the human body as a living surface to make the position of the nucleus pulposus variable

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