Improving the Study of Multiobjective Optimization of a Stent

Stent placement keep artery open but it perturbs more often blood flow. Stent shape in artery can provoke the presence of recirculation zones, blood stagnation zones, thrombosis and embolism. the aim of this work is to find optimal stents shapes in order to reduce blood stagnation and recirculation zones. As it has already been observed [2], [8] a stent associated with a higher value of shear stress is preferred because it lowers the risk of the late restenosis by reducing the precence of blood stagnation. A former paper [3], [9] had shown that a stent associated with a lower value of vorticity is preferred. Qualitative study [3], shows that the variation of vorticity and shear stress depend entirely on the variation of three parameters l, h and w. In the previous papers [3], [7] the multiobjective optimization of a stent is studied without taking into account the effect of fluid-stent interaction in unsteady blood flow. That hypothesis simplifies the study.