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区别于传统圆形截面丝支架,本研究中提出新型的三角形截面丝支架。与相同孔隙率的传统支架进行对比研究,探讨新型支架治疗颅内动脉瘤的血流动力学有效性。分别建立植入圆形截面丝支架、三角形截面丝支架和不植入支架动脉瘤三维有限元模型;设置相同的边界条件,利用流固耦合数值模拟的方法对流动阻力、速度、压力、壁面切应力和网格变形等参数进行了计算和分析。研究发现,三角形截面支架的流动阻力值小于圆形截面支架,并且植入三角形截面支架后动脉瘤的速度、压力、网格变形等参数在数值上均大于植入圆形截面支架模型,壁面切应力的峰谷值也有所增加。三角形截面支架针对梭形动脉瘤的治疗效果并不如圆形截面支架。在临床应用时,应考虑各项因素,择优而定。真正的临床应用效果,还需要进一步的实验验证。
Different from the traditional circular cross-section wire stent, this study proposed a new triangular cross-section wire stent. Compared with the traditional scaffold with the same porosity, the hemodynamic validity of the new scaffold for the treatment of intracranial aneurysms was explored. The three-dimensional finite element model of circular cross-section wire stent, triangular cross-section wire stent and non-stent-graft aneurysm were established respectively. The same boundary conditions were set up and the flow resistance, velocity, pressure, Stress and mesh deformation parameters were calculated and analyzed. The results showed that the flow resistance value of the triangular cross-section stent was smaller than that of the circular cross-section stent, and the velocity, pressure and deformation of the aneurysm after the triangular cross-section stent implantation were numerically larger than those of the circular cross-section stent model. The peak value of stress also increased. Triangular scaffold for the treatment of fusiform aneurysms is not as good as the circular cross-section scaffold. In clinical applications, various factors should be considered, the preferred and may be. The real clinical application results, but also need further experimental verification.