基于CosmosWorks有限元分析在腰椎弹性内固定棒中的应用

CosmosWorks-based finite element analysis for lumbar elastic fixation rod

背景:引起假体松动的原因主要有力学因素和生物因素,所以应力分布和松动的机制是目前研究热点。目的:应用有限元分析腰椎"U"型弹性内固定器的力学特征。方法:运用solidworks2008三维建模软件建立弹性内固定棒的实体模型,并借助其中的CosmosWorks工具进行有限元分析,分别施加压缩、前屈及拉伸等各种生理载荷,观察模型在不同载荷下弹性内固定器的应力分布,内固定棒在变形过程中其本身结构中各节点、单元的受力、位移情况。结果与结论:"U"型弹性内固定器的应力分布在"U"型连接棒的"U"型区上,应力应变曲线表现出较好的弹性作用。

BACKGROUND：Mechanical and biological factors are main causes for prosthesis loosening,so the stress distribution and implant loosening mechanisms have aroused the attention of scholars.OBJECTIVE：To analyze mechanical properties of lumbar spine ＂U＂-type flexible mechanical fixation device using finite element analysis.METHODS：Three-dimensional modeling software of solidworks2008 was used to establish a flexible rod fixation of the entity model,and CosmosWorks tools were used for finite element analysis,respectively,to exert compression,flexion,and tensile and other physical load.The stress distribution of model under different loads elastic fixation device was observed,and each node unit force and displacement situation of fixation rods in the deformation process were observed.RESULTS AND CONCLUSION：The ＂U＂-type elastic stress distributes within the fixation device in the ＂U＂-type connecting rods of the ＂U＂-type area,and the stress-strain curves show a good elasticity.