Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1996-04-01
1997-10-28
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264573, 264230, 264235, 264342R, 264346, 264900, 604 96, 606194, B29C 4908, B29C 4964
Patent
active
056815220
ABSTRACT:
To improve the re-wrappability of the expander members used on balloon catheters subsequent to an initial inflation thereof, the balloon member is subjected to an annealing process in which the balloon member, in its wrapped configuration, is placed within a plastic sheath and it, together with the sheath, is then placed between the jaws of a clamping fixture where the jaws may be heated to a predetermined temperature. When the jaws are made to close on the sheath and the wrapped balloon contained within it, the wrapped balloon is subjected to a radial compressive pressure and a temperature approximately equal to or above the glass transition temperature for the balloon material utilized and then maintained at that temperature for a predetermined time interval. The annealing is found to introduce a memory component into the plastic of the balloon that causes it to assume a lower profile upon deflation than otherwise obtained.
REFERENCES:
patent: 5015231 (1991-05-01), Keith et al.
patent: 5053007 (1991-10-01), Euteneuer
patent: 5137512 (1992-08-01), Burns et al.
patent: 5425710 (1995-06-01), Khair et al.
Schneider (USA) Inc.
Timm Catherine
LandOfFree
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