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目的构建蜿蜒型动脉瘤和弯曲支架三维有限元模型,研究支架植入动脉瘤后的血流动力学的变化。方法通过CAD软件构建出几何实体模型,借助有限元软件利用计算流体力学方法,分别对无支架和有支架的蜿蜒型脑动脉瘤定常流动血流动力学进行数值模拟,分析在动脉瘤中植入内支架前后的瘤腔内流动情形、压力和壁面切应力分布的变化情况。结果有支架动脉瘤模型上游瘤腔内的血流速度被大大削弱,圆顶突起处局部高压力明显减弱,在下游瘤腔沿壁面的压力也得到明显降低并且分布也均衡了很多,末端唇缘处局部高切应力消失了,出现的是较小且均衡的切应力。结论有支架模型瘤腔内的流速明显减小,均衡的压力分布与瘤腔内减弱的流动速度是相互统一的,利于瘤腔内血栓的形成。
Objective To construct the three-dimensional finite element model of serpentine aneurysm and curved stent and study the hemodynamic changes after stent implantation. Methods The geometric solid model was constructed by CAD software. The finite element software CFD was used to simulate the steady flow hemodynamics of unsmooth and braced meandering cerebral aneurysms respectively. Into the stent before and after the tumor cavity flow, pressure and wall shear stress distribution changes. As a result, the blood flow velocity in the tumor cavity in the upper part of the stent aneurysm model was greatly weakened, the local high pressure on the dome protrusion was significantly weakened, and the pressure along the wall in the downstream tumor cavity was also significantly reduced and the distribution was also balanced. Local high shear stresses disappear, and small and well-balanced shear stresses occur. Conclusions The velocity of flow in the luminal cavity decreases with the stent model. The balanced pressure distribution and the weakened flow velocity in the luminal cavity are consistent with each other, which facilitates the formation of thrombus in the tumor cavity.