US5741452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orienting extrusion processes for medical tubing applications
Assignee: Baxter International Inc
•
Filing: 1996-05-03
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Granted: 1998-04-21
•
Expires: 2016-05-03
Abstract
Abstract The present invention provides a method for fabricating flexible medical tubings including the steps of providing a polymeric material, forming a tubing from the polymeric material, the tubing having a longitudinal axis and an initial diameter, and orienting the tubing along the longitudinal axis of the tubing to reduce the diameter of the tubing to define an oriented diameter.
Inventors
- 👤 Patrick T. Ryan
- 👤 Chuan Qin
- 👤 Donna L. Rostron
- 👤 Birendra K. Lal
- 👤 Yuanpang S. Ding
- 👤 Susan R. Mizener
- 👤 Lecon Woo
- 👤 Michael T. K. Ling
- 👤 Martin F. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:44
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/22; A; A61; A61L; A61L29/00; A61L29/04; A61L29/041; A61L29/042; A61L29/06; A61M; A61M25/00; A61M25/0009; B29C48/00; B29C48/001; B29C48/0018; B29C48/0022; B29C48/03; B29C48/09; B29C48/10; B29C48/16; B29C48/18; B29C48/21; B29C71/00; B29C71/02; B29L; B29L2023/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
63 words
A method for fabricating flexible medical tubings comprising the steps of: providing a polymeric material; forming a tubing from the polymeric material, the tubing having a longitudinal axis and an initial diameter; orienting the tubing along the longitudinal axis of the tubing to reduce the diameter of the tubing to define an oriented diameter; and heat setting the tubing in the oriented diameter.
Claim 2
Independent Claim
63 words
A method for fabricating flexible medical tubings comprising the steps of: providing a polymeric material; forming a tubing from the polymeric material, the tubing having a longitudinal axis and an initial diameter; orienting the tubing along the longitudinal axis of the tubing to reduce the diameter of the tubing to define an oriented diameter; and heat setting the tubing in the oriented diameter.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the initial diameter of the tubing is within the range of 10%-300% greater than the oriented diameter.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the step of forming a tubing from the polymeric material comprises the step of extruding the tubing in an extruder.
Claim 5
Dependent Claim
119 words
The method of claim 1 wherein the polymeric material is a blend comprising: a polymeric material selected from the group consisting of polyolefins and their copolymers, ethylene-propylene rubber, ethylene vinyl acetate copolymers, ethylene methyl acrylate copolymers, styrene and hydrocarbon block copolymer, hydrogenated derivatives of styrene and hydrocarbon block copolymers, thermoplastic elastomers, polyurethanes, polyamide and polyester copolymers, copolyesters, polybutadiene, polyisoprene, polyisobutylene, styrene-butadiene rubbers, and cross-linked elastomers; and an additive material wherein the additive has greater than 5 carbon atoms and further has electron negative groups selected from the group of amines, amides, hydroxyls, acids, acetate, ammonium salts, organometallic compounds such as metal alcoholates, metal carboxylates, and metal complexes of numerous 1,3 dicarbonyl compounds, phenyl phosphines, pyridines, pyrrolidones, imidazoline, and oxazolines.
Claim 6
Dependent Claim
81 words
The method of claim 4 wherein the step of orienting the tubing comprises the steps of: pulling the tubing from the extruder with a first puller; pulling the tubing from the first puller to a position spaced a distance from the first puller with a second puller; and controlling the relative speeds of the first puller and the second puller so that the rate of pulling of the second puller is greater than the first puller to orient the tubing therebetween.
Claim 7
Dependent Claim
20 words
The method of claim 5 further comprising the step of cooling the tubing during the step of orienting the tubing.
Claim 8
Dependent Claim
47 words
The method of claim 6 wherein the step of cooling the tubing during the step of orienting the tubing comprises the steps of: providing a first fluid bath at a temperature within the range of 4° C.-45° C., and passing the tubing through the first fluid bath.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the step of heat setting the tubing includes the step of exposing the tubing to heat.
Claim 10
Dependent Claim
33 words
The method of claim 8 wherein the step of exposing the tubing to heat comprises the steps of: heating the tubing after the orienting step; and cooling the tubing after the heating step.
Claim 11
Dependent Claim
39 words
The method of claim 8 wherein the step of exposing the tubing to heat includes the step of raising the temperature of the tubing to a temperature above which it normally will be exposed during shipping, storage and use.
Claim 12
Dependent Claim
32 words
The method of claim 8 wherein the step of exposing the tubing to heat includes the step of raising the tubing to a temperature below which the tubing will be fully melted.
Claim 13
Dependent Claim
25 words
The method of claim 8 wherein the step of exposing the tubing to heat includes the step of exposing the tubing to a heated liquid.
Claim 14
Dependent Claim
11 words
The method of claim 12 wherein the heated liquid is water.
Claim 15
Dependent Claim
24 words
The method of claim 8 wherein the step of exposing the tubing to heat includes the step of exposing the tubing to heated air.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-20 | 2001-10-20 | 2002-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-20 | 2005-10-20 | 2006-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-20 | 2009-10-20 | 2010-04-21 | $7700.00 | Window Closed / Lapsed |