Omega-shaped artificial cervical disc implantation prosthesis with inverted-V-shaped two-way stopping inverted teeth

Abstract

The invention relates to an omega-shaped artificial cervical disc implantation prosthesis with inverted-V-shaped two-way stopping inverted teeth. The omega-shaped artificial cervical disc implantation prosthesis with the inverted-V-shaped two-way stopping inverted teeth comprises a body and is characterized in that the body is an omega-shaped non-contacting elastic structure with integral upper and lower end plates, the outer surfaces of the upper end plate and the lower end plate are provided with the inverted-V-shaped two-way stopping inverted teeth in a symmetrical mode, the length of the lower end plate of the body is 10-16mm, the length of the upper end plate is 1 mm shorter than that of the lower end plate, the distance between the upper end plate and the lower end plate is 2-3.5 mm, and the thickness of the bending section of the back end of the body is 0.6-1.2 mm. The omega-shaped artificial cervical disc implantation prosthesis with the inverted-V-shaped two-way stopping inverted teeth is stable in space after being implanted, is supported by elastic force and does not need to be fixed with screws, avoids direct friction and abrasion between the upper end plate and the lower end plate fundamentally, and can meet the performance requirements of long service life and anti-fatigue effect of an implantation prosthesis. By means of the omega-shaped artificial cervical disc implantation prosthesis with the inverted-V-shaped two-way stopping inverted teeth, the range of motion of the anteflexion and the range of motion of the lateroflexion of a cervical vertebra segment reaches 30%-60% of the range of motion of the anteflexion and the range of motion of a normal cervical vertebra after a patient is subjected to operation, and the range of motion of the posterior extension reaches 70%-80% of the range of motion of the posterior extension of the normal cervical vertebra.

Description

technical field [0001] The invention relates to an artificial cervical intervertebral disc implantation prosthesis, in particular to an Ω-shaped artificial cervical intervertebral disc implantation prosthesis with herringbone bidirectional anti-retraction teeth. Background technique [0002] Human cervical spondylosis is a common and frequently-occurring disease. The main cause of cervical spondylosis is herniated intervertebral disc. If the degree of degeneration is mild, one or two segments of the anterior neck need to be decompressed. The traditional anterior cervical fusion surgery removes the diseased intervertebral disc, implants autologous bone, allogeneic bone or artificial bone, and some patients need to be fixed with a titanium plate. The ultimate goal of these operations is to relieve the compression of the intervertebral disc on the nerve and fuse the diseased motion segment. In recent years, the medical community has discovered the sequelae of spinal fusion, b...

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

Atypical ossification due to the inability of existing products to restore and maintain the height of the intervertebral space and maintain segmental stability

Second, common artificial cervical intervertebral disc products have poor anti-fatigue and anti-wear properties. Fatigue fracture and fatigue wear cause the prosthesis to easily produce wear particles, and the wear particles can cause aseptic bone resorption, resulting in failure of prosthesis replacement. Complications occur; the third is that the known elastic artificial cervical intervertebral disc prosthesis is made of cobalt chromium alloy, titanium alloy Ti6Al4V or pure titanium material, and the prosthesis of these materials cannot recover well after being implanted in the cervical intervertebral space Motor function in normal cervical segments

[0004] 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 precise design methods 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

Fourth, the segmental mobility of the existing integrated shrapnel type artificial cervical intervertebral disc after implantation is quite different from that of the normal cervical segmental segmental range, which cannot restore the normal cervical segmental motion function well.

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