Inter-vertebral dynamic fixator

Abstract

The invention relates to an inter-vertebral dynamic fixator and belongs to the technical field of dynamic inner fixation among a spinal vertebral body. The inter-vertebral dynamic fixator is of an integral forming structure and comprises an elastomer and fixation boards; the fixation boards are arranged on the upper end and the lower end of the elastomer respectively, multiple anti-loose teeth are evenly arranged on the outer surface of each fixation plate respectively, the same side of each fixation plate is fixedly connected with one or more extension fixation boards respectively, and circular screw holes are formed in the extension fixation boards. By adopting the inter-vertebral dynamic fixator, a series of elastic activities of a spine surgery segment are realized through the elastomer, wherein the elastic activities comprise the extension and flexion of the spine surgery segment on the sagittal position, the side bending of the spine surgery segment in the left and right direction, the rotation of the spine surgery segment on the coronal position and the circumduction of the spine surgery segment formed by a synthetic movement in multi-directions. The surgery operation is simple, the bone resection amount is little, the stability of the spine after surgery is high, no impact and wear exist among parts after implantation, and the fixator adapts to the physiological activity pattern of the human spine.

Description

technical field [0001] The invention relates to a dynamic intervertebral fixator, which belongs to the technical field of internal fixation of human spine of medical equipment. Background technique [0002] At present, spinal fusion technology has achieved good results in the treatment of cervical and lumbar degenerative diseases, with a fusion rate of over 90%. However, studies have shown that its clinical efficacy has not reached the expected value; moreover, rigid internal fixation and spinal fusion may accelerate adjacent segment degeneration, internal fixation failure, and postoperative complications of pseudarthrosis. In view of this, dynamic fixation of the spine is becoming a popular technique in the treatment of degenerative cervical and lumbar diseases in recent years. At present, there are artificial total intervertebral disc replacement, artificial nucleus pulposus replacement, transpedicular dynamic fixation, interspinous process or interspinous plate dynamic fi...

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Problems solved by technology

[0003] At present, gratifying progress has been made in artificial intervertebral disc replacement, but there are still many complications in artificial intervertebral disc replacement, such as fixator wear, displacement, loosening, poor mobility, ossification of the prosthesis, and fracture of the cover plate, etc. Among them, the wear of the fixator is one of the important reasons for the failure of the operation. At present, most of the artificial intervertebral discs used in the market are composite structures, and most of them are composed of metal and non-metal materials. During the use process, wear reactions will inevitably occur. The generated particles will cause discomfort to patients and problems such as loosening and falling off of the fixator, which cannot meet the needs of people's use

[0004] In addition, the activities of the human spine include extension and flexion in the sagittal position, lateral bending in the left and right directions, rotation in the coronal position, and a circle formed by comprehensive motion in multiple directions, but the existing artificial intervertebral fixators are difficult to match The physiological activity pattern of the universal movement of the human spine matches, some can only move in one direction, some stress is easy to concentrate somewhere and cause the fixator to break, some fixator parts collide and cause wear and tear, and some are used for a long time When the elastic body has weak anti-elastic attenuation ability, some of them cannot realize that the center of rotation of the prosthesis is close to the center of rotation on the coronal and sagittal positions of the human spine at the same time, so there is a discrepancy with the physiological activity mode of the human spine. Due to problems such as poor matching, it is difficult to guarantee low complications and good long-term effects

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