Comparison Study of Flow Diverting Stents for the Treatment of a Patient-specific Abdominal Aortic Aneurysm

Abstract

Flow diverting (FD) stents are implanted to decrease the aneurysm's blood flow for rupture prevention. We employed computational fluid dynamic (CFD) methods to examine pre- and post-stented flow parameters in abdominal aortic aneurysms. This study aims to investigate and evaluate the effect of two various flow stents on patient-specific abdominal aortic models. The hemodynamic characteristics of the two stents were studied and compared, including velocity field, pressure, time average wall shear stress (TAWSS), and its related indices. The simulation results show that Stent2 offers further flow reduction; however, Stent1 has a higher relative residence time (RRT). In addition, Stent2 reduces TAWSS and increases oscillatory shear index (OSI) and endothelial cell action potential (ECAP). Finally, Stent2 protects the aneurysm from rupture and creates a suitable environment for thrombus formation, which may help the aneurysm degrade.