摘要
冠脉支架植入术已成为治疗冠心病的重要手段,使用支架时,对支架有一个预压缩的过程,从而使其固定在球囊上,然后才能进行后续的扩张操作。研究利用有限元方法,在不考虑支架与血管的相互作用及承受血管内脉动载荷的情况下,模拟了三种不同材料(CoCr合金,316L不锈钢和Mg合金)但具有相同结构的支架预压缩和自由扩张的过程。通过设定有限元模型的网格,边界条件,载荷等关键因素,得出不同材料支架的变形机理,定量地比较了每种支架的径向回弹,轴向缩短等力学性能参数并预测了支架的安全系数。
Coronary artery stent implantation has become an important means to cure coronary heart disease.When the stent is used,there is a pre-compression for the stent to fix it on the balloon,and then the following work.is carried out.Ignoring pulsating load on the stent,finite element method is used to simulate pre-compression and free-expansion process of the stent without considering the interaction between stent and vessel.Three kinds of stents with different materials but the same structure are modeled,and the key fac- tors such as meshing,boundary conditions and load definition are discussed.The results demonstrate defor- mation mechanism can be used to calculate radical recoil rate and axial shortening rate.At last,the safety factors of stents are forecasted.
出处
《机械设计与制造》
北大核心
2012年第10期237-239,共3页
Machinery Design & Manufacture
基金
国家自然科学基金项目(81160186)
内蒙古自然科学基金项目(2011BS0708)
内蒙古自治区高等学校科学研究项目(NJZY11077)
关键词
冠脉支架
力学性能
扩张变形
有限元分析
Key Words：Coronary Stent
Mechanical Properties
Expansion Deformation
Finite Element Anal- ysis
