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CFD Study on the Efficacy of Flow Diverter Stent Placement for Cerebral Aneurysms
Author(s): Y. Ito, Inheok Cho, Y. Sakai, Koji Iwano
Keywords: Cerebral aneurysm; CFD; Flow diverter stent; Hemodynamics; Flow rate
The effect of flow diverter (FD) stent placement as a cerebral aneurysm treatment on hemodynamics is systematically investigated by numerical simulations. The aneurysm diameter is set to 8 mm with an aspect ratio (AR) of 1.2 and 12 mm with an aspect ratio of 1.9. The curvature of the parent artery is also varied for the following three types: straight, inside, and outside. The blockage ratio of the FD stent was set to 31 %. The results reveal that, regardless of artery shape, the FD stent drastically modifies the flow in the aneurysm, including changing the flow direction in the systolic phase. The flow rate into the aneurysm is significantly reduced by the stent in most of the cases, but it is increased in the straight artery case with the AR = 1.9 aneurysm model. Oscillatory shear index (OSI) generally becomes higher owing to FD stent placement, while the wall shear stress is substantially decreased. In particular, a high OSI area is widely distributed in the large (AR = 1.9) aneurysm sac for the straight and inside artery cases. Although idealized aneurysm models are employed in the present study, and further parametric studies particularly with respect to the stent configuration are required, these facts possibly explain the unexpected outcome in some (but not all) large aneurysm cases.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.