狭窄率反映血管的堵塞程度,不同狭窄率对血管内支架力学性能的影响不同。利用有限元法对4种支架分别在30％,40％,50％的狭窄血管内进行力学性能模拟分析,研究狭窄率对支架变形行为和力学性能的影响。结果显示,狭窄率对支架的等效应力影响较小,而支架结构对血管内应力分布具有明显的影响,其中开环支架对血管内应力影响大于闭环支架；随着血管内狭窄率的升高,支架轴向缩短率呈减小的趋势、径向回弹率与扩张不均匀性呈增大的趋势,血管内等效应力具有增加的趋势；狭窄率对闭环支架径向回弹率与扩张不均匀性的影响比开环支架更显著。通过对狭窄率影响的分析,再现了不同堵塞程度血管对不同支架的影响,为支架的设计与植入提供理论依据。
Rate of stenosis reflects the level of vascular stenosis,different stenosis rate do different impact on mechanical properties of vascular stents.Going simulation and analysis using finite element method on four dif-ferent stents under the stenosed rate of 30%,40%,50%,investigate the effect of stenosis rate on stents’de-formation behavior and mechanical properties.Result shows:there was little effect on equivalent stress of stents which generated from stenosis rate,but the stents’structure exert an significant effect on stress distribution of blood vessels,the effect on vascular stress which open loop stents supported was obvious than the one closed loop stents supported;with the increase of stenosed rate,the axial shortening rate of stents have a tendency to decrease,radial spring-back rate and expansion uniformity have a tendency to increase,vascular stress have a tendency to increase too;the impact on closed loop stents'radial spring-back rate and expansion uniformity caused by stenosed rate was obvious than the one on open loop stents.By analyzing the influence caused by ste-nosed rate,showed the impact on different stents caused by different serious of blocked arteries,provided theo-retical basis for designing and implanting of the stent.
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