Understanding the mechanical properties of self-expandable stents: A key to successful product development

Daisuke Yoshino, Katsumi Inoue, Yukihito Narita

Research output: Contribution to journalArticlepeer-review

Abstract

A medical device of mesh-shaped tubular structure called stent is frequently used to expand the constric-tion of a blood vessel. The stent normally has the structure of longitudinal repetition of wavy wire parts and strut parts, and its mechanical properties such as bending flexibility and rigidity in radial direction mainly depend on the shape of wavy wire and construction of the strut. In the first stage of this paper, the mechanical properties of self-expandable stents are evaluated using a non-linear finite element method. The initial stent models are gener-ated in a 3D-CAD system, and their expanded shapes are predicted first. They form the finite elements for the evaluation of the mechanical properties, then the influences of stent shape on the mechanical properties are com-puted and discussed. In the second stage, a basic method for the selection of a stent is proposed from a view point of mechanics. This enables us to select useful stents that are well adapted to a patient's condition, though medical examination is necessary.

Original languageEnglish
Pages (from-to)471-485
Number of pages15
JournalStrojniski Vestnik/Journal of Mechanical Engineering
Volume54
Issue number6
Publication statusPublished - 2008 Aug 12

Keywords

  • Biomechanics
  • Finite element method
  • Modeling, 3D-CAD systems
  • Self-expandable stents

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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