Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1987-11-30
1990-10-16
Pellegrino, Stephen C.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
With internal application of fluid pressure
264512, 604 96, 606194, B29D 2200, B29C 4500
Patent
active
049633139
ABSTRACT:
An inflatable medical balloon is formed by fabricating a tubular preform having a tapered region at the end of the portion where the main body of the balloon will form to enable the corresponding transition section of the blown balloon to have a separately controllable thickness profile. The preferred method includes providing a tube of a selected resin of wall thickness and diameter suitable for being formed into a balloon, and selectively heating to drawing temperature a defined region of the tube at one or both ends of the portion of the tube from which the balloon is to be formed. Tension is applied in opposite directions to respective ends of the heated region to draw the region to a smaller diameter, thereby providing a preform having, at the end of the portion of the tube, a tapered, relatively small diameter region of material that has substantially no crystallization or molecular orientation. In preferred embodiments a tapered region is provided at both ends of the portion in which the main body of the balloon is to be formed. Thereafter the tubular preform is heated to blowing temperature and, while heated, a balloon is formed by drawing and blowing the preform including the tapered regions. The balloon is mounted to form a balloon catheter device. A dilatation balloon catheter, is also described having wall thickness in the transition region less than 0.001 inch.
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Barry, Jr. Ralph J.
Madenjian Arthur R.
Noddin Richard A.
Boston Scientific Corporation
Pellegrino Stephen C.
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