可转化腔静脉滤器的生物力学性能分析

Research on Biomechanics Properties of the Convertible Vena Cava Filter

利用有限元法与计算流体动力学的方法,分析可转化腔静脉滤器在植入与转化过程中与血管的相互作用机理及对血流的影响。结果显示,滤器转化后的综合力学性能相对较好;由于滤器转化前变形较大使得血管产生较大的应力,出口血流速度增大使得过滤网上的剪应力较大,较大的支撑刚度容易对血管造成损伤;滤器转化支架后应力降低,血管的应力峰值降低,出口速度降低,支撑刚度降低,在支撑元件表面易形成爬皮现象,且有益于滤器转化支架后的准确定位。分析可转化腔静脉滤器在植入与转化过程中与血管的相互作用机理及对血流的影响,为滤器的结构设计和干预治疗提供更加科学的指导。

To investigate the interaction with vessel and the influence to bloodstream during the implantion of the convertible vena cava filter,by using the method of Finite Element Method(FEM)and Computational Fluid Dynamics(CFD).The results show that after the transformation,the mechanical properties and fluid properties of the convertible vena cava filter are better.Before the transformation,the peak stress in the working condition of the VCF is the biggest,the peak stress of the vessel is the biggest,the support stiffness is the biggest,the exit velocity is more fast,and the shear stress at the filter is bigger,which easy to harm the blood vessels.After the transformation,the peak stress in the working condition of the VCF is the biggest,the peak stress of the vessel is the minimum,the support stiffness is the minimum,the exit velocity is more fast,and the shear stress at the filter is smaller,which easy to form the phenomenon of climb to the skin and good for the location.To investigate the interaction with vessel and the influence to bloodstream during the implantation of the convertible vena cava filter,which have provided a more scientific guidance for the design of the filter and the intervention treatment.