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

Dong Bin Kim, Hyuk Choi, Sang Min Joo, Han Ki Kim, Jae Hee Shin, Min Ho Hwang, Jaesoon Choi, Dong Gon Kim, Kwang Ho Lee, Choon Hak Lim, Sun Kook Yoo, Heung Man Lee, Kyung Sun

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17 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)368-379
Number of pages12
JournalArtificial Organs
Volume37
Issue number4
DOIs
Publication statusPublished - 2013 Apr 1

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Keywords

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

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Bioengineering
  • Medicine (miscellaneous)

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