Vidas, Arrett & Steinkraus
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 B A B B A A
B29C B29C A61L B29C B29L A61M A61L
inventional inventional inventional inventional additional inventional inventional
Jianhua Lixiao Daniel J. Nao
Chen Wang Horn Lee