摘要
目的分析球囊翼片数目对装配后球囊支架系统性能的影响,为球囊支架装配工艺以及球囊支架的后续设计结构优化提供理论支持。方法首先对Pebax球囊材料样本进行拉伸试验,得到轴向与周向应力应变曲线。然后采用抗拉性能弱的球囊周向应力应变曲线,构建基于Yeoh模型的球囊材料本构方程。之后使用Solid Works软件建立二翼、三翼、五翼球囊以及支架模型,利用ABAQUS软件对球囊支架进行吹塑以及压握模拟,以球囊表面应力、支架最终直径作为球囊支架系统性能评价参数。最后利用水压爆破仪和游标卡尺来检测装配后球囊支架系统的爆破压和直径,验证有限元模拟的准确性。并根据有限元的分析结果优选出三翼和五翼球囊支架进行抗脱载力实验对比分析。结果仿真中球囊表面应力集中在球囊褶皱位置,其中二翼球囊表面应力最大。二翼、三翼、五翼球囊支架系统的最终直径基本相同。实验结果与有限元模拟结果相一致。抗脱载力实验中五翼球囊支架抗脱载力较三翼球囊支架更大。结论球囊翼片数目对装配后球囊支架系统的性能影响显著,五翼球囊支架系统在综合性能评价上表现出优势。本研究可以指导球囊与支架装配参数的调试以及球囊支架结构的优化设计。
Objective To analyze the influence from the balloon wing numbers on the performance of the assembled balloon expandable stents,and to provide theoretical support for the balloon stent assembly process and the optimization design of the balloon expandable stent.Methods Firstly,stress-strain curves in axial and hoop directions were obtained through tensile experiments of Pebax balloon sample.Then the material constitutive equation of balloon was established in finite element based on the Yeoh model according to the stress-strain curve of the balloon with weaker tensile strength in hoop direction.Moreover,the stent and balloon models with two-wing,three-wing,five-wing were established by Solid Works.The process of compression and expanding behavior were simulated in ABAQUS,the parameters such as balloon stress and final diameter of the stent were to evaluate the performance of different balloon expandable stent.Finally,the burst pressure of assembled balloon expandable stents was tested by hydraulic blasting apparatus and the diameters of assembled balloon expandable stents were measured by a caliper to verify the accuracy of the finite element simulation.Based on the results of both simulation and experiment,the balloon expandable stent of three-wing and five-wing were selected for comparison test of anti-dislodgement force experiment.Results The stress concentrated on the position of folded area on the balloon surface.The two-wing balloon had larger stress on balloon surface than others.The final diameters of the two-wing balloon expandable stent was similar to the others.The experimental results were consistent with simulation results.In the anti-dislodgement force test,five-wing balloon expandable stent was better than three-wing balloon expanded stent.Conclusions The balloon wing number has a significant influence on the performance of the assembled balloon expandable stent.The five-wing balloon expandable stent shows the best performance in certain tests.The study promotes the adjustment of balloon expandable
作者
艾泽琪
谷雪莲
肖善社
姜洪焱
AI Zeqi;GU Xuelian;XIAO Shanshe;JIANG Hongyan(College of Medical Instrument and Food Engineering University of Shanghai for Science and Technology,Shanghai 200093;Microport Medical(Group)Co.Ltd.,Shanghai 201203)
出处
《北京生物医学工程》
2019年第6期590-597,共8页
Beijing Biomedical Engineering
基金
上海市生物医学工程研究生示范实践基地(14018308001)资助
