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Free Recovery Effects of Shape-Memory Polymers for Cardiovascular Stents

Published online by Cambridge University Press:  26 February 2011

Christopher Michael Yakacki ,
Robin Shandas ,
Craig Lanning  and
Ken Gall
Christopher Michael Yakacki
Affiliation:
chris.yakacki@colorado.edu, University of Colorado at Boulder, Department of Mechanical Engineering, United States
Robin Shandas
Affiliation:
robin.shandas@colorado.edu, Univerisity of Colorado at Boulder, Department of Mechanical Engineering, United States
Craig Lanning
Affiliation:
lanning@rintintin.colorado.edu, The Children's Hospital Denver, Division of Cardiology, United States
Ken Gall
Affiliation:
ken.gall@mse.gatech.edu, The Geogia Institute of Technology, Department of Materials Science and Engineering, United States
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Abstract

The shape-memory effect was examined in polymer stents intended for cardiovascular applications. Four polymer networks were synthesized from poly(ethylene glycol) dimethacrylate and tert-butyl acrylate with 10 wt% and 20 wt% crosslinker, and with glass transition temperatures (Tg) of 52°C and 55°C. Solid and 50% porous stents were manufactured and tested for free strain recoverability at temperatures at or just above 37°C. Stents with lower glass transition temperatures and a higher degree of crosslinking recovered faster than their counterparts. Lower deformation (packaging) temperatures and higher recovery temperatures induce more rapid recovery. The presence of geometrical features, such as pores, initiated recovery sooner, but had negligible influence on overall recovery.

Keywords

biomedicalpolymerdevices
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 898: Symposium L – Mechanical Behavior of Biological and Biomimetic Materials , 2005 , 0898-L15-01
Copyright
Copyright © Materials Research Society 2006

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References

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