Numerical simulation of stent deployment is very important to the surgical planning and risk assess of the interventional treatment for the cardio-cerebrovascular diseases. Our group developed a framework to deploy the braided stent and the stent graft virtually by finite element simulation. By using the framework, the whole process of the deployment of the flow diverter to treat a cerebral aneurysm was simulated, and the deformation of the parent artery and the distributions of the stress in the parent artery wall were investigated. The results provided some information to improve the intervention of cerebral aneurysm and optimize the design of the flow diverter. Furthermore, the whole process of the deployment of the stent graft to treat an aortic dissection was simulated, and the distributions of the stress in the aortic wall were investigated when the different oversize ratio of the stent graft was selected. The simulation results proved that the maximum stress located at the position where the bare metal ring touched the artery wall. The results also can be applied to improve the intervention of the aortic dissection and the design of the stent graft.
血管支架的虚拟释放在心脑血管疾病的介入治疗手术规划、风险评估中具有非常重要的作用。本课题组基于有限元方法建立了编织型支架和覆膜支架虚拟释放的数值仿真平台，利用该仿真平台模拟了血流导向装置植入治疗脑动脉瘤的整个过程，并分析了血管的变形以及血管壁上的应力和应变等力学参数，为脑动脉瘤介入治疗手术规划以及血流导向装置的优化设计提供了依据；模拟了覆膜支架植入治疗主动脉夹层的整个过程，并研究了不同直径放大率的覆膜支架植入后血管壁所受应力的变化，进一步证实了血管壁上的最大应力点分布在血管壁与第一节细小镍钛合金环接触处，为优化手术方案和覆膜支架的设计提供了依据。.
Keywords: aortic dissection; braided stent; cerebral aneurysm; finite element simulation; stent graft.