title: A comparative reliability and performance study of different stent designs in terms of mechanical properties: foreshortening, recoil, radial force, and flexibility.
abstract: 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 3 mm in working diameter and 18 mm 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 ± 0.28 N; B, 3.81 ± 0.32 N; C, 4.35 ± 0.18 N; and D, 4.02 ± 0.24 N. Radial forces determined by applying uniform pressure in the circumferential direction were A, 28.749 ± 0.81 N; B, 32.231 ± 1.80 N; C, 34.522 ± 3.06 N; and D, 42.183 ± 2.84 N. The maximum force of crimped stent at 2.2-mm deflection was 1.01 ± 0.08 N, 0.82 ± 0.08 N, 0.92 ± 0.12 N, and 0.68 ± 0.07 N 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.
authors: Graduate Program in Biomedical Engineering, Yonsei University.
authors: Dong Bin
authors: DB
authors: Kim
authors: Hyuk
authors: H
authors: Choi
authors: Sang Min
authors: SM
authors: Joo
authors: Han Ki
authors: HK
authors: Kim
authors: Jae Hee
authors: JH
authors: Shin
authors: Min Ho
authors: MH
authors: Hwang
authors: Jaesoon
authors: J
authors: Choi
authors: Dong-Gon
authors: DG
authors: Kim
authors: Kwang Ho
authors: KH
authors: Lee
authors: Chun Hak
authors: CH
authors: Lim
authors: Sun Kook
authors: SK
authors: Yoo
authors: Heung-Man
authors: HM
authors: Lee
authors: Kyung
authors: K
authors: Sun
mesh_terms: D020342:Finite Element Analysis; D006801:Humans; D018583:Pliability; D011474:Prosthesis Design; D015203:Reproducibility of Results; D015607:Stents; D013314:Stress, Mechanical