A numerical study based on finite element method on the effect of geometrical parameters of the coronary artery aneurysm on the mechanical stress created on the aneurysm wall

While several articles have reported aneurysm occurrence in the coronary arteries, this kind of aneurysm has not been sufficiently studied in the literature, and most of the related studies have focused on the investigation on aneurysm in the abdominal aorta. Considering the potential risk of rupture in the coronary artery aneurysm due to mechanical stresses and its severe complications, the effect of the geometrical parameters of the aneurysm such as its radius, length and symmetry on the stress distribution on the aneurysm wall has been investigated in this paper. For this purpose, a fluid-structure interaction analysis has been performed in the framework of the finite element method to determine the von Mises stress on the aneurysm wall induced by pulsating blood flow. The accuracy of the developed model is evaluated by comparing its results with available data in the literature for a benchmark problem. It has been observed that the aneurysm radius has a more significant effect on the wall stress than its length. Furthermore, increasing the aneurysm radius or reducing its length will increase the maximum wall stress. Asymmetric aneurysm is subjected to higher stresses compared to the symmetric one.