摘要
镁合金支架作为未来介入治疗的理想支架越来越受到关注。为研究镁合金支架在介入治疗中的变形行为,应用有限元方法分析了镁合金支架在不同的压握扩张尺寸对支架力学性能(最大等效应力、径向回弹率、轴向短缩率和径向支撑强度)的影响。结果表明,压握扩张尺寸对支架的径向支撑强度影响很小。相同扩张尺寸下,支架的最大等效应力和回弹率随压握尺寸的增大而减小。相同压握尺寸下,与径向回弹率相反,支架的最大等效应力和轴向缩短率随扩张尺寸增大而增大。另外该文还通过实验验证了有限元分析得到的径向支撑强度位移曲线,两者结果基本吻合,说明了有限元方法可以高效地为研究者提供可靠、高质量的设计。
Magnesium stents have gained increasing interest as an ideal stent of future intervention. In order to study the deformation behavior of magnesium alloy stents in the interventional treatment, the finite element method was used to analysis the effects of different crimp and expansion dimensions on the mechanical properties （maximum stress, radial recoil rate, longitudinal shortening rate and radial strength）. The results showed that crimping and expanding have a minimal influence on the stent radial strength. When the expansion size is same, the maximum equivalent stress and recoil rate decrease with the crimp size. When the crimp size is same, in contrast with the radial recoil rate, the maximum equivalent stress and longitudinal shortening rate increase with the expansion size. In addition the paper verified the radial strength-radial displacement curve obtained by FEM. Results are basically consistent, indicating the finite element method can efficiently provide researchers with reliable, high-quality design.
出处
《中国医疗器械杂志》
CAS
2014年第3期161-164,176,共5页
Chinese Journal of Medical Instrumentation
基金
科技部支撑项目(2012BAI18B01)
上海市科学技术委员会科研计划项目课题(11441900600)
关键词
镁合金支架
压握
扩张
力学性能
有限元
magnesium stent, crimp, expansion, mechanical properties, finite element analysis
