A Comparative Reliability and Performance Study of Different Stent Designs in Terms of Mechanical Properties: Foreshortening, Recoil, Radial Force, and Flexibility

作者：Kim Dong Bin; Choi Hyuk^*; Joo Sang Min; Kim Han Ki; Shin Jae Hee; Hwang Min Ho; Choi Jaesoon; Kim Dong Gon; Lee Kwang Ho; Lim Chun Hak; Yoo Sun Kook; Lee Heung Man; Sun Kyung

来源：Artificial Organs, 2013, 37(4): 368-379.

DOI：10.1111/aor.12001

• Coronary stent
• Reliability performance testing
• Flexibility
• Recoil
• Radial force
• Uniformity
• Foreshortening
• Finite element method

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.

• 出版日期2013-4