抄録
Stenting is a common treatment of stenosis. One of problems of stent treatment is restenosis. Local hemodynamic factor such as low wall shear stress (WSS) is one of the reasons for restenosis. Therefore, blood flow analyses have been performed to clarify the restenosis mechanism. Fluid-Structure Interaction (FSI) is used for blood flow analysis to consider the interaction between fluid pressure and structure deformation. In this research, the effects of the deformed vessel by stenting and pulsating flow are analyzed using FSI. The stent expansion analysis was performed to obtain the deformed shape using FEM analysis software ANSYS Mechanical APDL. FSI analysis was performed to examine the effect of a pulsating vessel using ANSYS Workbench. An initial stent model was made based on the shape of before the expansion. The expanded stent model was also made based on the shape of the expanded stent. To reveal the effect of pulsatile on the blood flow after the stenosis, two boundary conditions were employed; rigid wall and FSI. Inlet flow rate was assumed to be expressed by a periodic function to reproduce the pulsating flow in the carotid artery. The results of velocity, pressure difference and WSS are shown for each model and condition. In the case of rigid wall, WSS at the stenting site is reduced by the expansion of the vessel.
