有限元法
钛镍合金
材料科学
支架
狭窄
形状记忆合金
主动脉瓣
生物医学工程
结构工程
复合材料
外科
放射科
医学
工程类
作者
Fatemeh Salemizadeh Parizi,Reza Mehrabi,Mohammad Reza Karamooz-Ravari
标识
DOI:10.1177/0954411919865404
摘要
Transcatheter aortic valve implantation is a minimally invasive treatment for severe symptomatic aortic valve stenosis. Nitinol stents are proposed for aortic stenosis patients at high risk. In the present study, at different implantation depths in the aortic valve, the crimping and performance of Nitinol stents are investigated. To do so, a constitutive model based on Microplane theory is utilized and implemented through the finite element to express the constitutive characteristics of Nitinol. The self-expanding stent made of NiTi is designed and simulated using the finite element method. To validate the developed model, the obtained results using beam and solid finite element models are compared with those reported in the literature. Superelastic behavior as well as shape memory effect of the Nitinol stent is studied during crimping and deployment. The simulated results show that the produced radial force increases by increasing the implantation depth in a cardiac cycle.
科研通智能强力驱动
Strongly Powered by AbleSci AI