Thermomechanical properties, collapse pressure, and expansion of shape memory polymer neurovascular stent prototypes

Géraldine M. Baer, Thomas S. Wilson, Ward Small IV, Jonathan Hartman, William J. Benett, Dennis L Matthews, Duncan J. Maitland

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Shape memory polymer stent prototypes were fabricated from thermoplastic polyurethane. Commercial stents are generally made of stainless steel or other alloys. These alloys are too stiff and prevent most stent designs from being able to navigate small and tortuous vessels to reach intracranial lesions. A solid tubular model and a high flexibility laser etched model are presented. The stents were tested for collapse in a pressure chamber. At 37°C, the full collapse pressure was comparable to that of commercially available stents, and higher than the estimatedmaximumpressure exerted byintracranial arteries. However, there is a potential for onset of collapse, which needs further study. The stents were crimped and expanded, the laser-etched stent showed full recovery with an expansion ratio of 2.7 and a 1% axial shortening.

Original languageEnglish (US)
Pages (from-to)421-429
Number of pages9
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume90
Issue number1
DOIs
StatePublished - Jul 2009

Keywords

  • In vitro
  • Mechanical properties
  • Polyurethane(s)
  • Vascular stents

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials

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