摘要
冠状动脉支架作为经皮穿刺冠状动脉成形术中保持病变血管畅通的核心器件,其紧缩到球囊后保持力的大小直接关系到在输送过程中支架从球囊脱落的危险性。支架所选的材料主要为316L不锈钢,但钴铬合金以其独特的性能开始被关注。本文利用有限元方法系统地研究了专有支架设计,在不同支架材料下,紧缩到不同程度及支架筋尺寸的变化对支架紧缩反弹行为的影响。结果显示,在这些因素中,支架所选用的材料是影响支架反弹指标的最重要因素,钴铬合金材料支架的反弹量明显大于316L不锈钢支架,约为40%。因此,有限元方法对支架力学行为分析具有很大的帮助,为支架系统的优化设计提供了重要指导作用。
Coronary stent is an important device used in Percutaneous Transluminal Coronary Angioplasty （PTCA）, which is usually implanted to support the stenosed artery. The retention of stent clinging to the balloon is a crucial factor to avoid the stent slipping off from the balloon during its delivery to the blockage. 316L stainless stent is widely used in clinic currently, however, Co-Cr alloy stent, with its unique properties, has obtained more and more attention. In this paper, the finite element method （FEM） was applied to systematically analyze the crimped mechanical behavior of coronary stents, which is influenced by the width and thickness of strut, the crimped scale of stents and stent materials used. The results show that radial recoil of stent after being crimped depends greatly on the material used. And the recoil of Co-Cr stent is about 40% larger than that of 316L stainless steel stent. In conclusion, FEM can quantify some mechanical behaviors of stent and help designers to optimize stent system.
出处
《北京生物医学工程》
2006年第4期366-370,共5页
Beijing Biomedical Engineering
基金
国家高技术研究发展863计划(2002AA326010)资助
