Evaluation of the compressive mechanical properties of endoluminal metal stents

Stephan C. Schrader, Rafael Beyar

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanical properties of metal stents are important parameters in the consideration of stent design, matched to resist arterial recoil and vascular spasm. The purpose of this study was to develop a system for a standardized quantitative evaluation of the mechanical characteristics of various coronary stents. Several types of stents were compressed by external hydrostatic pressure. The stent diameter was assessed by placing a pair of small ultrasonic sono-crystals on the stent. From pressure-strain diagrams the ultimate strength and radial stiffness for each stent were determined. For all stents, except the MICRO-II and the Wiktor stent, the diameter decreased homogeneously until an ultimate compressive strength was exceeded, causing an abrupt collapse. Expanded to 3 mm, the mechanical behavior of the beStent, the Crown and the Palmaz-Schatz stent (PS153-series) were comparable. The spiral articulated Palmaz-Schatz stent showed twice the strength (1.26 atm) of the PS-153 (0.65 atm). The NIR stent yielded a maximum strength of 1.05 atm. The MICRO-II and the Wiktor stent did not collapse abruptly but rather showed a continuous decline of diameter with increasing external pressure. The Cardiocoil stent behaved in a fully elastic manner and showed the largest radial stiffness. Difference in mechanical properties between stents were documented using a new device specifically developed for that purpose. These mechanical stent parameters may have important clinical implications.

Original languageEnglish (US)
Pages (from-to)179-187
Number of pages9
JournalCatheterization and Cardiovascular Diagnosis
Volume44
Issue number2
DOIs
StatePublished - Jun 1998
Externally publishedYes

Keywords

  • Angioplasty
  • Coronary
  • Endoprosthesis
  • Radial strength

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Fingerprint

Dive into the research topics of 'Evaluation of the compressive mechanical properties of endoluminal metal stents'. Together they form a unique fingerprint.

Cite this