一种血管内支架的有限元模型及计算流体动力学分析

支架植入所造成的血栓、血管损伤及其对血流动力学的影响是造成支架内再狭窄的主要原因。我们利用有限元模型与计算流体动力学的方法,分析了一种支架在植入过程中与斑块、血管的相互作用及其对血流情况的影响。结果发现：支架植入后端部发生翘起,这容易损伤血管壁;支架植入模型所对应的即刻回缩率明显高于支架自身的回缩率,其结果分别为12.3%、3.1%;支架壁厚与连接筋设计能够引起血管壁面剪应力的明显变化。这对于血管内支架的设计具有一定的指导意义。

Finite Element Method and Computational Fluid Dynamics Used in the Analysis of a Stent

Stent implantation can cause thrombus,vessel injury and blood flow disturbance which are considered as the main causes of instent restenosis.In order to investigate the influence of stent implantation on vessel wall and blood flow,we used finite element method(FEM)and computational fluid dynamics(CFD)in this work.The results showed that the implantation of the stent could cause vessel injury and flow stagnation.The instant recoil of the implanted stent is much more than that of the stent itself(12.3% versus 3.1%).In conclusion,FEM and CFD can help illustrate and quantify some biomechanical characteristics for the optimization of stent design.