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通过改变支架环的几何参数,提出膨出式Ti Ni合金血管支架的设计理念,用于隔绝因主动脉夹层远端破口血液返流造成的假腔持续灌注,加快假腔血栓化进程。利用Solidworks软件设计膨出式支架环模型,利用ABAQUS有限元软件,结合正交实验分组探究不同几何参数对膨出式支架支撑性能的影响,并结合支架径向支撑力实验对比分析,验证有限元分析的合理性。结果表明:膨出段支架合理的参数选择是提高支架膨出段支撑性能的重要途径,增加支架丝径与膨出段支架环个数,可以提高膨出段支架的支撑性能,而增加膨出段长度则会使支撑性能降低;丝径、膨出段长度、膨出度、支架环个数对支撑性能的影响程度依次减弱;通过优化几何参数提高支架径向支撑性能时,应控制其设计径向支撑力不能超过夹层内膜可承受的生理极限;样品径向支撑力的实验结果与模拟结果吻合度较好,验证了有限元分析的合理性。
By changing the geometric parameters of the stent ring, a design concept of a bulging Ti-Ni alloy stent was proposed to prevent continuous perfusion of the false lumen caused by blood reflux at the distal end of the aortic dissection and to speed up the process of false lumen thrombosis. Using Solidworks software to design bulging scaffolding ring model, the ABAQUS finite element software and orthogonal experiment group were used to explore the influence of different geometrical parameters on the propping performance of bulging scaffolding. Combined with the comparative analysis of radial support force, the finite element method Analysis of the rationality. The results show that reasonable parameter selection of bulging stent is an important way to improve the brace performance of bulging stent. Increasing the diameter of stent and the number of stent ring can increase the support of bulging stent, The length of the segment will make the support performance decrease; the influence of the wire diameter, the bulge length, the bulge degree and the number of the stent rings on the support performance will be weakened in turn; when optimizing the radial support performance of the stent by optimizing the geometric parameters, the design of the support should be controlled The radial support force can not exceed the physiological limit of the sandwich inner membrane. The experimental results of the sample radial support force are in good agreement with the simulation results, which verify the rationality of the finite element analysis.