Open Access

ABSTRACT

Virtual Implantation of Stent-graft by Finite Element Simulation and Its Applications in Endovascular Treatment Planning for B Type Aortic Dissection

Zhuanyuan Meng¹, Tao Ma², Zhihui Dong², Shengzhang Wang^1,*, Weiguo Fu²

1 Institute of Biomechanics & Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China.
2 Department of Vascular Surgery, Zhongshan Hospital & Institute of Vascular Surgery, Fudan University, Shanghai 200032, China
* Corresponding Author: Shengzhang Wang. Email: szwang@fudan.edu.cn.

Molecular & Cellular Biomechanics 2019, 16(Suppl.2), 60-60. https://doi.org/10.32604/mcb.2019.07253

Abstract

Thoracic endovascular aortic repair has been widely applied to treat Stanford Type B aortic dissection. However, retrograde type A dissection can occur as a complication after thoracic endovascular repair for Stanford type B aortic dissection. In order to investigated the possible mechanical reasons of the new entry occurring when stent grafts were implanted into the true lumen of one type B aortic dissection, a framework of virtual implantation of stent-graft by using finite element simulations was developed in this paper. The animal experiments were adopted to verify the finite element simulation of stent-graft implantation. Moreover, the manufactured stent-grafts were implanted virtually into the true lumen of the model of patient-specific aortic dissection with difference configurations such as oversizing ratio, anchoring position, stent struct. The following conclusions are summarized: (a) the radial force plays a more dominant role than the elastic recoil support in the deployed stent-graft. Excessive oversizing ratio may lead to the insufficient expansion of stent graft and retrograde aortic dissection; (b) the anchoring position of the stent-graft has a clear effect on the stress of the aorta, and the bare stent and thinner nickel-titanium alloy ring generate the higher stress at the aorta wall; (c) Comparing the three manufactured stent-grafts: Talent, Valiant and cTag, the later two have the better deployed geometries and better adherence to the artery wall.

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Keywords

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