Assessment of shape memory alloy stent deployment in a stenosed artery

Shijia Zhao, Linxia Gu, Stacey R. Froemming

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Purpose: Shape memory alloy (SMA) stents have been used increasingly for the treatment of complex arterial occlusions. There is an immediate need to quantify the mechanical performance of SMA stents to open occluded arteries. Methods: The stent crimping and expanding process was assessed through both numerical modeling and in-vitro studies. The implantation of a SMA stent in curved arteries with eccentric stenosis were simulated to evaluate the effect of artery curvature on arterial mechanics. Results: The crimping process stored a considerable amount of strain energy in the stent, which were then released through self-expansion until a balance between the stent and stenosed artery was achieved. The deployed SMA stent exhibited a dog-bone shape, where the longitudinal ends of the stent penetrated into the artery causing arterial stress concentrations. However, the maximum arterial stress was observed at the central portion of artery contacting the thin side of the plaque. Furthermore, stent-induced arterial mechanics were more pronounced in the curved artery than the straight artery. The maximum Von Mises stress in the curved artery with a curvature of 0.05 mm-1 was 37% larger than that found in the straight artery. The percentage of the intimal area at higher stress level (> 0.05 MPa) is 5.51% in the curved artery, compared to 1.76% in the straight artery. Conclusions: This work provided a fundamental understanding of the behavior of SMA stent and its impact on the vascular wall, and illuminated the possibilities for exploiting their potential to alleviate arterial injury.

Original languageEnglish (US)
Pages (from-to)226-231
Number of pages6
JournalBiomedical Engineering Letters
Volume1
Issue number4
DOIs
StatePublished - Nov 1 2011

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Stents
Shape memory effect
Mechanics
Strain energy
Stress concentration
Bone

Keywords

  • Curved artery
  • Eccentric stenosis
  • Finite element method
  • Shape memory alloy
  • Stenting

ASJC Scopus subject areas

  • Biomedical Engineering

Cite this

Assessment of shape memory alloy stent deployment in a stenosed artery. / Zhao, Shijia; Gu, Linxia; Froemming, Stacey R.

In: Biomedical Engineering Letters, Vol. 1, No. 4, 01.11.2011, p. 226-231.

Research output: Contribution to journalArticle

Zhao, Shijia ; Gu, Linxia ; Froemming, Stacey R. / Assessment of shape memory alloy stent deployment in a stenosed artery. In: Biomedical Engineering Letters. 2011 ; Vol. 1, No. 4. pp. 226-231.
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