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Thoracolumbar spine posterior approach micro-movement fixing system

A fixation system, thoracolumbar spine technology, applied in fixers, internal fixators, medical science, etc., to achieve the effect of good biocompatibility, high reliability, and simple structure

Inactive Publication Date: 2017-06-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, investigations by many scholars have found that both the Dynesys system and the Graf ligament system have relatively serious defects.

Method used

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  • Thoracolumbar spine posterior approach micro-movement fixing system
  • Thoracolumbar spine posterior approach micro-movement fixing system
  • Thoracolumbar spine posterior approach micro-movement fixing system

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Embodiment Construction

[0026] Below, the present invention will be further elaborated in detail in conjunction with the accompanying drawings.

[0027] see figure 1 , figure 2 , Figure 3(a)-Figure 3(b) , the thoracolumbar posterior fretting fixation system of the present invention includes two fretting pedicle screws 2, a titanium alloy connecting rod 1 for connecting the two fretting pedicle screws 2, and a titanium alloy rod 1 for locking and fixing. Connecting rod 1 and locking jackscrew 3 of pedicle screw 2.

[0028] As shown in Fig. 4(a), Fig. 4(b) and Fig. 4(c), the micro-movement pedicle screw 2 is composed of two parts, the ball-head screw 5 and the screw base 4, and the ball-head screw 5 and the screw base 4 are riveted together. As a whole, the ball stud 5 can rotate slightly in a limited direction in the nail seat 4, and the closing opening 10 at the front end of the nail seat 4 blocks the front part of the ball head 9 of the ball stud 5, preventing the ball stud 5 from being pulled ...

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Abstract

The invention relates to the field of medical apparatus and instruments in the department of orthopaedics and particularly relates to a thoracolumbar spine posterior approach micro-movement fixing system which is used for fixing thoracolumbar spines when thoracolumbar spines develop lesions and injures. The thoracolumbar spine posterior approach micro-movement fixing system comprises two micro-movement pedicle screws, a titanium alloy connection rod for connecting the two micro-movement pedicle screws, and locking jackscrews for locking and fixing the titanium alloy connection rod and the micro-movement pedicle screws; each micro-movement pedicle screw is consists of a ball head nail and a nail seat which are riveted; each ball head nail is fixed by the corresponding nail seat; each nail seat and the corresponding ball head nail form a rotating range so as to enable the ball head nail to slightly rotate within an inner limiting direction of the nail seat; the front part of the head of each ball head nail is locked by a tightening opening at the front end of the corresponding nail seat. For the thoracolumbar spine posterior approach micro-movement fixing system disclosed by the invention, anatomic characteristics of Chinese people are fully considered, all design parameters directly come from spine anatomy database of Chinese people, thoracolumbar internal fixation operation requirements can be met, and the fixation and restoration effects are good.

Description

technical field [0001] The invention relates to the field of orthopedic medical devices, in particular to a thoracolumbar posterior micro-motion fixation system for fixing the thoracolumbar spine when the thoracolumbar spine is diseased or damaged. Background technique [0002] Lumbar fusion surgery is a general surgery for the treatment of lumbar instability caused by various diseases such as joint degeneration and intervertebral disc herniation. The key to the operation is to implant internal fixation devices to ensure the stability of the diseased lumbar spine, thereby giving the necessary conditions for bone graft fusion . The internal fixation device used is a strong system. After implantation in the lumbar spine, the mobility of the implanted segment will be excessively restricted, resulting in degeneration of adjacent segments and unreliable or even failure of bone graft fusion. At the same time, it may also be caused by internal stress If the concentration is too la...

Claims

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Application Information

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IPC IPC(8): A61B17/68A61B17/70A61B17/86
CPCA61B17/68A61B17/7002A61B17/704A61B17/861A61B17/8625A61B2017/564
Inventor 颜云辉刘闯宋克臣董志鹏
Owner NORTHEASTERN UNIV
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