用于数值模拟的带支架个性化主动脉弓动脉瘤有限元模型的构建

Patient-specific Finite Element Model Construction of Aortic Arch Aneurysm With Stents for Numerical Simulation

为了准确地分析动脉瘤壁面切应力及梯度变化,采用逆向工程的思想方法,借助Geomagic和Pro/E软件,以原始STL(stereo lithography)格式的表面模型为依据,建立了一个个性化主动脉弓动脉瘤实体模型,并在其内部创建理想化支架;利用ANSYS有限元分析软件,最终完成实体模型的建立和分块,并针对边界层和支架进行分区域网格划分.结果表明:所建立的有限元模型可进行血流动力学模拟仿真;模型基本满足对特定区域网格细划分的需要,可以为支架介入治疗动脉瘤的血流动力学仿真提供基础;这种模型建立方法为建立其他类似模型提供了参考.

In order to make more precise analysis on wall shear stress and gradient variation,it is necessary to create a patient-specific model of aortic arch aneurysm that can perform particular meshing in boundary layer for numerical simulation.Based on a surface model in STL format,reverse engineering concept is adopted to reconstruct a solid model of aortic arch aneurysm by means of integrating CAD software of geomagic and Pro/E,and its simplified stents model is also created.By using ANSYS software,this model is divided into several parts.Particular meshing is performed especially in boundary layer and around the stents. Hemodynamics simulation is carried out by using the finite element model.This solid model can be meshed according to particular requirements in several parts respectively,and employed to simulating hemodynamics in aortic arch aneurysm treated with endovascular stent.The method of modeling is applicable and can be used as a reference for similar model construction.