Vidas, Arrett & Steinkraus, P.A.
Method of balloon formation by cold drawing/necking
 A method for forming a balloon for a dilatation catheter involving the steps of extruding a segment of thermoplastic material, maintaining the center portion at a temperature below the glass transition of the thermoplastic material, drawing the segment to a predetermined length, wherein after the drawing the wall thickness of the center portion does not appreciably change, and expanding the segment in a mold to produce the balloon. 
SciMed Life Systems, Inc.
B A B A B B A
B29C A61L B29C A61M B29C B29L A61L
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Nao Daniel J. Lixiao Jianhua
Lee Horn Wang Chen