Modeling hemodynamics after flow diverter with a porous medium

Abstract

In this work, we propose a novel approach for modeling hemodynamics after flow diverter (FD) stent in cerebral aneurysms. One image-based aneurysm model was used. The stented portion at the parent artery was modeled as a porous medium. Cell size, porous medium thickness and FD porosity were evaluated. Velocity magnitude and wall shear stress (WSS) inside the aneurysm were reduced after FD placement. Bigger cells compared to the stent strut diameter can be used. Thicker porous medium (which is equivalent of inserting multiple FDs) induces lower intra-aneurysmal velocity and WSS. Lower FD porosities produce higher reductions of intra-aneurysmal velocities, which diminish the contrast concentration inside the aneurysm and increase its residence time. Device design and multiple FD placements can be evaluated without remeshing the fluid domain.