An integrated artificial cervical intervertebral disc prosthesis with high mobility

Abstract

The invention relates to an integrated artificial cervical intervertebral disc false body with high mobility. The body is of an Omega -shaped non-contact elastic structure with an upper end plate and a lower end plate integrated. The body is made of a titanium alloy with elasticity modulus being 55-90 Gpa and yield strength equal to or larger than 600MPa. Herringbone two-way retreating-stopping inverting teeth or rhombic two-way retreating-stopping inverting teeth are symmetrically arranged on the outer surfaces of the upper end plate and the lower end plate of the body respectively. The lower end plate of the body is 10-16mm in length, the upper end plate is 1mm shorter than the lower end plate, the distance between the upper end plate and the lower end plate is 2-3.5mm, the total height of the body is 5-8mm, and the thickness of the bending section at the rear end of the body is 0.5-0.9mm. The integrated artificial cervical intervertebral disc false body can meet the requirements for long service life and fatigue resistance, greatly improves the mobility of lesion bone sections of patients and is scientific and reasonable in achieving methods, remarkable in effects, obvious in advantages and favorable for improving health level of people.

Description

technical field [0001] The invention relates to an artificial cervical intervertebral disc prosthesis, in particular to an integrated artificial cervical intervertebral disc prosthesis with high mobility. Background technique [0002] Artificial cervical disc replacement can decompress the spinal cord and provide stability while maintaining the physiological activity of the surgical segment, which is more in line with the biomechanical characteristics of cervical spine activities, and can avoid accelerated degeneration of adjacent segmental discs. Provides a brand new medical technique. At present, the main clinically used artificial cervical intervertebral discs include Bryan prosthesis, Prodisc-C prosthesis, Prestige prosthesis, PCM prosthesis, etc. Although various prosthesis materials and shapes are different, these prostheses generally have the following disadvantages: First, the common artificial cervical intervertebral disc products have a cumbersome structure and re...

AI Technical Summary

Problems solved by technology

Although various prosthetic materials and shapes are different, these prostheses generally have the following disadvantages: First, the common artificial cervical intervertebral disc products have a cumbersome structure and relatively complicated surgery, which can easily cause heterotopic ossification

Because the existing products cannot restore and maintain the height of the intervertebral space well and maintain segmental stability, atypical ossification is caused; second, the common artificial cervical intervertebral disc products have poor anti-fatigue and anti-wear performance, fatigue fracture, Fatigue wear causes the prosthesis to easily produce wear particles, and the wear particles can cause aseptic bone resorption, resulting in failure of prosthesis replacement and postoperative complications; third, the material of the known elastic artificial cervical intervertebral disc prosthesis is cobalt Chromium alloy, titanium alloy Ti6Al4V or pure titanium, due to the insufficient elastic modulus of these materials, the prosthesis cannot restore the normal cervical segmental motion function well after being implanted in the cervical intervertebral space

[0003] Chinese patent application 200620112142 discloses a "shrapnel-type artificial intervertebral disc", although this solution uses a horseshoe-shaped shrapnel, and measures such as a plurality of barbs are respectively arranged on the upper and lower sides of the shrapnel to realize the cooperation with the patient's normal intervertebral disc. purpose, but there are still the following major deficiencies: First, from the perspective of biophysics, the upper and lower sides of the shrapnel have a symmetrical structure, which can neither satisfy the physiological lordosis of the human cervical spine, nor can it fill the intervertebral space well, so that the intervertebral disc The flexion, extension, and compression shock absorption functions are limited, so the horseshoe-shaped shrapnel is not the best elastic body; the second is that the barbs provided on the upper and lower sides of the shrapnel only have a one-way stop function, and it is easy to cause prosthesis and vertebral body damage. The stress concentration on the surface; the third is the lack of precision design means for the curvature and height, so that the implanted prosthesis cannot restore and maintain the height of the intervertebral space and the stability of the segment; the fourth is the existing integrated shrapnel type After artificial cervical disc implantation, the range of motion of the segment is quite different from that of the normal cervical segment, and the motion function of the normal cervical segment cannot be restored well.

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