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Proceedings Paper

Shape memory polymer therapeutic devices for stroke
Author(s): Thomas S. Wilson; Ward Small IV; William J. Benett; Jane P. Bearinger; Duncan J. Maitland
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Paper Abstract

Shape memory polymers (SMPs) are attracting a great deal of interest in the scientific community for their use in applications ranging from light weight structures in space to micro-actuators in MEMS devices. These relatively new materials can be formed into a primary shape, reformed into a stable secondary shape, and then controllably actuated to recover their primary shape. The first part of this presentation will be a brief review of the types of polymeric structures which give rise to shape memory behavior in the context of new shape memory polymers with highly regular network structures recently developed at LLNL for biomedical devices. These new urethane SMPs have improved optical and physical properties relative to commercial SMPs, including improved clarity, high actuation force, and sharper actuation transition. In the second part of the presentation we discuss the development of SMP based devices for mechanically removing neurovascular occlusions which result in ischemic stroke. These devices are delivered to the site of the occlusion in compressed form, are pushed through the occlusion, actuated (usually optically) to take on an expanded conformation, and then used to dislodge and grip the thrombus while it is withdrawn through the catheter.

Paper Details

Date Published: 11 November 2005
PDF: 8 pages
Proc. SPIE 6007, Smart Medical and Biomedical Sensor Technology III, 60070R (11 November 2005); doi: 10.1117/12.630873
Show Author Affiliations
Thomas S. Wilson, Lawrence Livermore National Lab. (United States)
Ward Small IV, Lawrence Livermore National Lab. (United States)
William J. Benett, Lawrence Livermore National Lab. (United States)
Jane P. Bearinger, Lawrence Livermore National Lab. (United States)
Duncan J. Maitland, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 6007:
Smart Medical and Biomedical Sensor Technology III
Brian M. Cullum; J. Chance Carter, Editor(s)

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