A melt extruded catheter of thermoplastic elastomeric hydrophilic polyurethane synthesized from a diisocyanate, polyethyleneoxide glycol of high molecular weight and a chain extender expands to a larger lumen size when contacted with an aqueous liquid. The catheter may include an antithrombogenic agent,...http://www.google.fr/patents/US5061254?utm_source=gb-gplus-shareBrevet US5061254 - Thermoplastic elastomeric hydrophilic polyetherurethane expandable catheter
