Investigation of the stent induced deformation on hemodynamic of internal carotid aneurysms by computational fluid dynamics

Application of the stent for treatment of the internal carotid artery (ICA) aneurysms has been extensively increased in recent decades. In the present work, stent-induced deformations of the parent vessel of ICA aneurysms are fully investigated. This study tries to visualize blood stream and calculated hemodynamic factors inside the four ICA aneurysms after deformations of parent vessel. For the simulation of the non-Newtonian blood stream, computational fluid dynamic is applied with one-way Fluid-Solid interaction (FSI) approach. Four ICA aneurysms with different ostium sizes and neck vessel angle are selected for this investigation. Wall shear stress on wall of aneurysm is analyzed in two angles of deformation due to application of the stent. Blood flow investigation shows that the deformation of the aneurysm limited blood entrance to the sac region and this decreases the blood velocity and consequently oscillatory shear index (OSI) on the sac wall. It is also observed that the stent-induced deformation is more effective on those cases with extraordinary OSI values on aneurysm wall.

Automated summary

This study investigates the stent-induced deformations of the parent vessel of ICA aneurysms and their impact on blood flow and hemodynamic factors. Computational fluid dynamics with one-way Fluid-Solid interaction approach are used to simulate the non-Newtonian blood flow. The results show that the deformation of the aneurysm restricts blood entrance to the sac region and decreases blood velocity and oscillatory shear index (OSI) on the sac wall. It is also observed that the stent-induced deformation is more significant in cases with higher OSI values on the aneurysm wall.