Development of a Virtual Coil Model for Blood Flow Simulation in Coil-Embolized Aneurysms
Development of a Virtual Coil Model for Blood Flow Simulation in Coil-Embolized Aneurysms
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开发用于线圈栓塞动脉瘤血流模拟的虚拟线圈模型
DOI：
10.1115/imece2013-64435
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Wada
中科院分区：
文献类型：
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作者：
T. Otani;Satoshi;T. Fujinaka;M. Hirata;J. Kuroda;Katsuhiko Shibano;S. Wada
血流动力学被认为是评价弹簧圈栓塞治疗脑动脉瘤疗效的指标之一。为了详细分析弹簧圈栓塞动脉瘤的血流动力学，我们开发了一个虚拟弹簧圈模型的基础上的力学理论，弹簧圈变形朝着最小化弹性能量，并表示一个现实的配置栓塞弹簧圈在动脉瘤的插入模拟。然后，通过求解N.S.和连续性方程数值计算与有限体积法使用多面体网格。弹簧圈插入模拟表明，弹簧圈在动脉瘤中的分布几乎均匀，弹簧圈的填充密度超过10%。使用虚拟弹簧圈模型的血流分析表明，通过填充密度超过20%的弹簧圈栓塞，动脉瘤内的流动动量减少到10%以下。与栓塞弹簧圈使用多孔介质模型的模拟结果相比，弹簧圈栓塞在动脉瘤中的流动动量减少率方面没有显著差异。然而，在虚拟线圈模型和多孔介质模型中，通过流动涡度评估的局部流动动力学是不同的，特别是在动脉瘤的颈部区域。
Hemodynamics is considered to be one of the indices to evaluate the effects of the treatment by coil embolization for cerebral aneurysms. For the sake of detailed analysis of hemodynamics in coil-embolized aneurysms, we develop a virtual coil model based on the mechanical theory that the coil deforms toward minimizing the elastic energy, and represent a realistic configuration of the embolized coils in the aneurysm by the insertion simulation. Then, the blood flow analysis is done by solving the N.S. and continuity equations numerically with the finite volume method using polyhedral mesh. The coil insertion simulation demonstrated that almost uniform distribution of the coil in the aneurysm was achieved at over 10% packing density of the coil. The blood flow analysis using the virtual coil model showed that the flow momentum inside the aneurysm was reduced to less than 10% by coil embolization with a packing density over 20%. In comparison to the simulation results using a porous media model for the embolized coil, there was no significant difference in the reduction ratio of the flow momentum in the aneurysm by coil embolization. However, local flow dynamics evaluated by the flow vorticity was different in the virtual coil model and the porous media model, in particular at the neck region of the aneurysm.Copyright © 2013 by ASME