A Comparative Reliability and Performance Study of Different Stent Designs in Terms of Mechanical Properties: Foreshortening, Recoil, Radial Force, and Flexibility
A Comparative Reliability and Performance Study of Different Stent Designs in Terms of Mechanical Properties: Foreshortening, Recoil, Radial Force, and Flexibility
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DOI：
10.1111/aor.12001
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发表时间：
2013-04-01
影响因子：
2.4
通讯作者：
Sun, Kyung
中科院分区：
文献类型：
--
作者：
Kim, Dong Bin;Choi, Hyuk;Sun, Kyung
本研究旨在通过对冠状动脉支架进行可靠性性能测试和基于有限元法（FEM）的模拟来改善支架的机械性能。对三种市售支架设计和我们自己的新设计进行了试验，以测量影响性能的因素，特别是纵向短缩、回缩、径向力和柔韧性。本实验中使用的支架工作直径为3 mm，工作长度为18 mm。实验结果表明，支架A、B、C和我们的新设计D的纵向短缩分别相当于2.25%、0.67%、0.46%和0.41%。支架A、B、C和D的回缩率分别为6.00、4.35、3.50和4.36%。平行板径向力测量值为A，3.72 +/-0.28 N; B，3.81 +/-0.32 N; C，4.35 +/-0.18 N; D，4.02 +/-0.24 N。通过在圆周方向施加均匀压力确定的径向力为A，28.749 +/-0.81 N; B，32.231 +/-1.80 N; C，34.522 +/-3.06 N;和D，42.183 +/-2.84 N。对于支架A、B、C和D，2.2 mm偏转时压握支架的最大力分别为1.01 +/-0.08 N、0.82 +/-0.08 N、0.92 +/-0.12 N和0.68 +/-0.07 N。本研究的结果使我们能够确定几个因素，以提高支架的性能。在比较这些支架时，我们发现我们的设计，即由来自七所大学的合作团队设计的支架D，在纵向短缩、反冲、径向力和柔韧性的所有参数方面都优于市售支架。
This study seeks to improve the mechanical performance of stents by conducting reliability performance testing and finite element method (FEM)-based simulations for coronary stents. Three commercially available stent designs and our own new design were tested to measure the factors affecting performance, specifically foreshortening, recoil, radial force, and flexibility. The stents used in the present experiments were 3mm in working diameter and 18mm of working length. The results of the experiments indicate that the foreshortening of stents A, B, C, and our new design, D, was equivalent to 2.25, 0.67, 0.46, and 0.41%, respectively. The recoil of stents A, B, C, and D was 6.00, 4.35, 3.50, and 4.36%, respectively. Parallel plate radial force measurements were A, 3.72 +/- 0.28N; B, 3.81 +/- 0.32N; C, 4.35 +/- 0.18N; and D, 4.02 +/- 0.24N. Radial forces determined by applying uniform pressure in the circumferential direction were A, 28.749 +/- 0.81N; B, 32.231 +/- 1.80N; C, 34.522 +/- 3.06N; and D, 42.183 +/- 2.84N. The maximum force of crimped stent at 2.2-mm deflection was 1.01 +/- 0.08N, 0.82 +/- 0.08N, 0.92 +/- 0.12N, and 0.68 +/- 0.07N for each of stents A, B, C and D. The results of this study enabled us to identify several factors to enhance the performance of stents. In comparing these stents, we found that our design, stent D, which was designed by a collaborative team from seven universities, performed better than the commercial stents across all parameter of foreshortening, recoil, radial force, and flexibility.