In-vivo absorbable lumbar limitation dynamic fixing device

Abstract

The invention discloses an in-vivo absorbable lumbar limitation dynamic fixing device. The in-vivo absorbable lumbar limitation dynamic fixing device comprises a first locker, a spacer and a second locker, wherein the first locker, the spacer and the second locker are connected in series through mooring ropes. Buckles are arranged at the front end of the first locker, and locker fixing teeth are arranged at the tail end of the first locker. Spacer fixing teeth are arranged at both ends of the spacer. Locker fixing teeth are arranged at the front end of the second locker, and buckles are arranged at the tail end of the second locker. The locker fixing teeth can mesh with the spacer fixing teeth. The in-vivo absorbable lumbar limitation dynamic fixing device is applied to lumbar posterior fusion surgery on the basis of providing limited micro-motion, so that relatively rigid fixation to fusion segments at the initial stage is provided, and the movement of the fusion segments in all directions is limited; with healing of bone graft and the degradation of magnesium alloys in the fixing device, fixed segments have limited micro-motion in all directions, so that the healing of the bone graft is promoted, and the stress and activity of an adjacent segment are reduced; and finally, the magnesium alloys are completely degraded to reduce stress shielding.

Description

technical field [0001] The invention relates to the technical field of dynamic internal fixation devices, in particular to an absorbable lumbar restrictive dynamic fixation device in vivo. Background technique [0002] Spinal fusion surgery is one of the most important methods for the treatment of various spinal diseases. The most commonly used posterior fusion internal fixation device is a screw-rod system made of titanium alloy. It will significantly increase stress shielding, increase the stress and movement of adjacent segments, and it is reported that the incidence of adjacent segment disease after titanium rod fusion fixation is 2.5-28.4% in one year, and 11-100% in ten years after operation . [0003] On the other hand, the concept of "dynamic stability" has been gradually proposed and paid attention to. This system can simulate normal spinal motion, produce activities as similar as possible to the normal spine, change the way the motion segment bears load, and contr...

AI Technical Summary

Problems solved by technology

In addition, the bone graft fusion block of this operation forms a structure similar to a tension band at the rear, so that the fusion segment still has a certain degree of fretting (it has been confirmed by finite element analysis, and it can be speculated that there will be a maximum in the absence of a hard titanium rod. fretting), which reduces the stress shielding of the fusion segment, and may reduce the stress shared by adjacent segments to a certain extent

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