CFD Analysis of Unsteady Flow in a Bypass-Grafted Artery

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  • B132 バイパス手術を施した血管内の非定常流れの CFD 解析

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It has been shown that intimal hyperplasia develops preferentially at the distal anastomosis of a bypass-grafted artery where flow is disturbed and complex secondary and recirculation flows form. Hence to elucidate the mechanism of localization of intimal hyperplasia, we have studied pulsatile flow patterns through an anatomically realistic model of a bypass-grafted artery by a computer aided simulation. It was found that fluid elements originally located in the vicinity of the vessel wall at the proximal anastomosis of the bypass-grafted artery travel all the way through the vessel close to the vessel wall and enter the toe and floor regions of the distal anastomosis where wall shear stress is relatively low and intimal hyperplasia tends to develop.

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