Application Of Reverse Engineering Method In The Construction Of Patient-Specific Aoritic Arch Aneurysm Model

As the in-depth study on aortic arch aneurysm, it is necessary to perform particular meshing in boundary layer in order to make more precise analysis on wall shear stress and gradient variation. Based on a surface model in STL format, reverse engineering concept was applied to reconstruct a patient-specific model of aortic arch aneurysm that could be meshed to obtain gradually finer grids especially in boundary layer.First of all, the original model was changed from STL surface to NURBS surface by geomagic software, and then imported it into Pro/E software in IGES format. The solid model of boundary layer and simplified stents around aneurysm were reconstructed based on the extracted data of geometry. This model was imported into ANSYS software using data interface. Based on the closed surfaces, solid model was reconstructed again. At last, particular meshing was performed especially in boundary layer and around the stents, and a simple hemodynamics simulation was carried out using the finite element model.This solid model closed to the real aortic arch aneurysm in geometry, could be meshed according to particular requirements in respective parts, and employed to simulate hemodynamics. It could be used to simulate hemodynamics in aortic arch aneurysm treated with different endovascular stents, and compare the different treatment outcome.More important is that this method of modeling is applicable not only for aortic arch aneurysm, but also for similar model construction as a reference.