Numerical simulation of hemodynamics in intracranial saccular aneurysm treated with a novel stent

摘要

Different from the traditional stents, a novel stent with triangular wire cross-section is proposed, and numerical simulation is performed to compare the hemodynamic effect of the novel stent with that of traditional ones. Three kinds of stents with circular, rectangular, and triangular wire cross-sections were designed to treat saccular aneurysm, which were named the C-stent model, the R-stent model, and the T-stent model, respectively. An unstented aneurysm model (named the Unstented model), as a control, was also designed. Fluid-structure interaction in these four models was simulated. The results demonstrate that the resistance of the novel T-stent model is lower than that of the R-stent model, but higher than that of the C-stent model. Compared with the C-stent model, the T-stent model exhibits greater velocity decrease and longer turnover time. Meanwhile, the pressure increase of the T-stent model is lower than the R-stent model, and the magnitude and the fluctuation of wall shear stress is optimized in the T-stent model. The novel stent with a bare triangular wire cross-section has some comparative advantages. These results may provide some theoretical guidance for the structural design of an endovascular stent for the interventional treatment of aneurysm.