Stress Analysis and Life Evaluation of ynamic Stabilization Fixator
Date Issued
2008
Date
2008
Author(s)
Shen, Chao-Ti
Abstract
Abstract Based on present designs for dynamic fixator of lumbar spine (dynamic stabilization fixator , DSF) , this study presents a new DSF design .The goals for the new DSF design are: to reduce intradiscal pressure without increasing the loads on adjacent discs ,to improve the movement and the load transfer of spinal segment ,to restore stability of motion segment. The finite element model of the lumbar spine was used to study the effect of the dynamic stabilization fixator(DSF) on the mechanical behavior at the L3/L4 level .The loading cases of compression ,flexion ,extension ,lateral bending were simulated and analysis of the pressure on intervertebral disc .To estimate whether the DSF will failure after implantation. The experiments are done by a machine that simulates the motion of DSF implant, and the vertebra are replaced by PE blocks .The cyclic loads of 40~60kg are applied during the experiments .The components of the DSF are checked after the experiments whether there are loosening ,distortion ,fracture ,and other damages .The contact surfaces between the bar spacer (UHMWPE)and screw (stainless steel) are observed to determine the wear behavior.
Subjects
dynamic stabilization fixator
FEM
wear
Type
thesis
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ntu-97-R95522528-1.pdf
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