Objective

Biodegradable stents represent a new technological development in the field of cardiovascular angioplasty. The stent geometry plays a crucial role in determining stent performance.

Methods

This study describes four stent models with various strut geometries (circular, triangular, hexagonal, and spline) and identical links. The performance of the various stents is assessed by modeling the processes of compression and balloon expansion using experimental and numerical techniques.

Results

Four adjustable variables related to radial strength, foreshortening rate, maximum expanded diameter and coverage are considered in this studies. The maximum stress distributions from our numerical analysis are in agreement with the experimental fracture measurements.

Conclusion

Analysis of the stent parameters indicates that the hexagonal geometry is a relatively good stent strut design. The results described in this paper will be useful in further optimization studies and for the development of stents with a higher radial strength and increased fracture resistance.

中文翻译：

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不同支杆几何形状的可生物降解支架的实验和数值模拟。

目的

可生物降解的支架代表了心血管血管成形术领域的一项新技术发展。支架的几何形状在确定支架性能方面起着至关重要的作用。

方法

这项研究描述了具有不同支杆几何形状（圆形，三角形，六边形和花键）且链接相同的四个支架模型。通过使用实验和数值技术对压缩和球囊扩张过程进行建模，可以评估各种支架的性能。

结果

在这项研究中考虑了与径向强度，缩短率，最大扩展直径和覆盖率有关的四个可调变量。我们的数值分析得出的最大应力分布与实验性断裂测量结果一致。

结论

支架参数的分析表明，六边形的几何形状是一种相对较好的支架支撑设计。本文描述的结果将对进一步的优化研究以及开发具有更高径向强度和更高抗断裂性的支架有用。