The dynamic analysis of the implantation process of a new vena cava filter was carried out by finite element analysis method to reveal the influence of the angle, length, width and thickness of the filter rod on its mechanical properties and the inner wall of the blood vessel. The results showed that the high-stress and high-strain areas of the filter were mainly concentrated in the connection between the filter rod and the filter wire. With the increase of the angle of the filter rod, the maximum equivalent stress and the maximum elastic strain on the filter wall decreased, while the maximum equivalent stress on the vascular wall increased. With the increase of the length of the filter rod, the maximum equivalent stress and strain peak of the filter wall increased, but the maximum equivalent stress of the vessel wall decreased. With the increase of the width and thickness of the filter rod, the maximum equivalent stress of the filter wall, the maximum elastic strain and the maximum equivalent stress of the vessel wall all showed an upward trend. The static safety factor of all filter models was greater than 1, and the structure after implantation was safe and reliable. The results of this study are expected to provide a theoretical basis for the structural optimization and deformation mechanism of the new type vena cava filter.
利用有限元分析法针对一款新型腔静脉滤器的植入过程进行显示动态分析，揭示滤器过滤柱角度、长度、宽度和厚度对其力学性能和血管内壁面的影响规律。结果显示，滤器高应力及高应变区域主要集中在过滤柱和过滤丝连接处，随着过滤柱角度的增加，滤器壁面最大等效应力和最大弹性应变减小，血管壁面最大等效应力增大；随着过滤柱长度的增大，滤器壁面最大等效应力和应变峰值也增大，血管壁最大等效应力反而减小；随着过滤柱宽度和厚度的增大，其滤器壁面最大等效应力、最大弹性应变以及血管壁最大等效应力均呈上升趋势。所有滤器模型的静安全系数均大于 1，植入血管后结构安全可靠。通过本文研究结果，期待可为新型腔静脉滤器结构优化及变形机制的研究提供相应的理论依据。.
Keywords: biomechanics properties; deformation behavior; finite element method; structural parameter; vena cava filter.