血管内支架三角形截面结构流阻的数值模拟实验  

Numerical simulation research of the triangular cross-section structure flow resistance in endovascular stent

作　　者：杨春燕[1] 顾兆勇[2] 张宏斌[1] 乔爱科[1] 

机构地区：[1]北京工业大学生命科学与生物工程学院,北京市100124 [2]北京工业大学机械工程与应用电子技术学院,北京市100124

出　　处：《中国组织工程研究与临床康复》2009年第39期7666-7670,共5页Journal of Clinical Rehabilitative Tissue Engineering Research

基　　金：国家自然科学基金资助项目(10772010);北京市自然科学基金资助项目(3092004)~~

摘　　要：利用数值模拟方法分析新型的三角形截面支架的血液流阻,找出影响血流动力学的支架结构参数,为血管内支架结构设计和优化提供参考依据。通过SoildWorks软件构建了三角形截面裸支架在无限流场中的4种模型,借助ANSYS有限元软件分别对4种模型进行计算流体力学数值模拟,分析模型施加非定常流之后的流动情形、压力分布和流阻的变化情况。结果提示三角形截面形状的支架应用于动脉瘤可以使血流流入瘤腔的阻力大而流出瘤腔的阻力小,导致血液流出容易流入难,从而抑制瘤腔的血液灌注和流动,能够降低瘤腔内的压力,对于动脉瘤的治疗起到一定的效果,这为今后支架结构的设计提供了一些理论指导意义。To provide a reference basis for the structural design and optimization of endovascular stent by analyzing the flow resistance of the new stent with triangle cross-section using numerical simulation method, and finding out the stent structure which will influence hemodynamic parameters. Four kinds of models of the triangle cross-section bare stent were constructed in infinite flow field using solidworks software. Numerical simulations of the four models were performed respectively using ANSYS finite element software. Steady flows and transient flows in these models were studied. Hemodynamics data in the four models were collected, such as the flow patterns, the distribution of pressure and the flow resistance of the new stents. The stent with triangular wire cross-section can be applied to cover aneurysm cavity because that resistance of blood inflow to aneurysm was large and outflow from aneurysm was small. Thus, it was easy to outflow than inflow. Thereby blood perfusion and flow of aneurysm cavity was restrained, and the pressure of aneurysm cavity was reduced, which plays a certain effect on the treatment of aneurysm. This result provides some instructions for the design of stent structure.

关 键 词：血管内支架 有限元法 流阻 血流动力学 

分 类 号：R318[医药卫生—生物医学工程]