Abstract

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Title:: Hemodynamic analysis of edge stenosis in lower extremity artery stent grafts

Author(s):: HONG Yang1; CHENG Yunzhang1; ZHU Qing2; LIU Xiangkun3; 1. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. MicroPort Endovascular Co., Ltd, Shanghai 201318, China; 3. MicroPort Scientific Corporation, Shanghai 201203, China

Keywords:: Keywords: lower extremity artery; stent graft; edge stenosis; hemodynamics; numerical simulation

Abstract:: Abstract: A three-dimensional model of nitinol stent graft is established to investigate the hemodynamics after the stent graft was implanted into blood vessels for the treatment of arterial stenosis of lower extremities. The finite element crimping simulation is firstly carried out to simulate the radial crimping deformation after the stent graft with a diameter of 8 mm was implanted into the blood vessel with a diameter of 7 mm. Based on the finite element results, a computational fluid dynamic model is established for computational fluid dynamic simulation analysis. The results show that there is malapposition between the proximal stent graft and the blood vessle. The low wall shear stress region in blood infiltration area accounted for 28.5% of the total low wall shear stress region, and the low flow velocity recirculation zone in blood infiltration area accounted for 30.1% of the total low flow velocity zone. The malapposition at the edge of stent graft is likely a major contributor to edge stenosis after stent graft implantation.