Performance of self-expanding nitinol stent in a curved artery: Impact of stent length and deployment orientation

Shijia Zhao, Linxia Gu, Stacey R. Froemming

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The primary aim of this work was to investigate the performance of self-expanding Nitinol stents in a curved artery through finite element analysis. The interaction between a PROTÉGÉTM GPS TM self-expanding Nitinol stent and a stenosed artery, as well as a sheath, was characterized in terms of acute lumen gain, stent underexpansion, incomplete stent apposition, and tissue prolapse. The clinical implications of these parameters were discussed. The impact of stent deployment orientation and the stent length on the arterial wall stress distribution were evaluated. It was found that the maximum principal stress increased by 17.46, when the deployment orientation of stent was varied at a 5 deg angle. A longer stent led to an increased contact pressure between stent and underlying tissue, which might alleviate the stent migration. However, it also caused a severe hinge effect and arterial stress concentration correspondingly, which might aggravate neointimal hyperplasia. The fundamental understanding of the behavior of a self-expanding stent and its clinical implications will facilitate a better device design.

Original languageEnglish (US)
Article number071007
JournalJournal of Biomechanical Engineering
Volume134
Issue number7
DOIs
StatePublished - 2012

Keywords

  • Nitinol
  • acute lumen gain
  • curved artery
  • incomplete stent apposition
  • self-expanding stent
  • stent underexpansion
  • stent-artery interaction
  • tissue prolapse

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)

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