US5453099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catheter tubing of controlled in vivo softening
Assignee: Becton Dickinson and Co
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Filing: 1994-05-18
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Granted: 1995-09-26
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Expires: 2014-05-18
Abstract
Abstract A catheter tubing has a layer of a hydrophobic stiffening polymer encapsulated by a layer of hydrophilic thermoplastic base polymer. Preferred stiffening polymers are polyesterpolyether block copolymers. Preferred base polymers are thermoplastic polyetherurethanes. The encapsulated layer may be a stripe or an annular layer having base polymer layers laminated on both surfaces thereof.
Inventors
- 👤 Min-Shiu Lee
- 👤 Mutlu Karakelle
- 👤 David E. Spielvogel
- 👤 Robert A. Taller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:19
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0043; A61M25/0054; A61L; A61L29/00; A61L29/08; A61L29/085; A61L29/14; A61M2025/0063; A61M2025/0064
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A tubing comprising one or more discontinuous rods of a hydrophobic thermoplastic stiffening polymer having a Shore D hardness of about 50-80 encapsulated by a hydrophilic thermoplastic polyetherurethane, said polyetherurethane comprising the reaction product of a diisocyanate, a chain extender and a polyetherglycol comprising at least 50% by weight of polytetramethylene ether glycol, said stiffening polymer being selected from the group consisting of a polyolefin, polycarbonate liquid crystalline polymer and polyurethane of 70 to 100% hard segment.
Claim 2
Dependent Claim
77 words
A tubing comprising one or more discontinuous rods of a hydrophobic thermoplastic stiffening polymer having a Shore D hardness of about 50-80 encapsulated by a hydrophilic thermoplastic polyetherurethane, said polyetherurethane comprising the reaction product of a diisocyanate, a chain extender and a polyetherglycol comprising at least 50% by weight of polytetramethylene ether glycol, said stiffening polymer being selected from the group consisting of a polyolefin, polycarbonate liquid crystalline polymer and polyurethane of 70 to 100% hard segment.
Claim 3
Dependent Claim
24 words
The tubing of claim 1 wherein said diisocyanate is selected from the group consisting of 4,4'-diphenylmethane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate.
Claim 4
Dependent Claim
37 words
The tubing of claim 1 wherein said chain extender is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,4'-bishydroxymethyl cyclohexane, hydroquinone dihydroxyethyl ether, hexane diamine, ethanolamine and mixtures thereof.
Claim 5
Dependent Claim
22 words
The tubing of claim 1 further comprising a radiopaque agent dispersed in at least one of said discontinuous rods and said polyetherurethane.
Claim 6
Dependent Claim
16 words
The tubing of claim 1 wherein said polyetherurethane has a Shore hardness of at least 95Å.
Claim 7
Dependent Claim
75 words
A tubing comprising one or more discontinuous rods of a hydrophobic thermoplastic stiffening polymer, said stiffening polymer comprising at least 30% by weight of a polyurethane having a hard segment content of 70-100% and a Shore D hardness of about 50-80%, said discontinuous rod being encapsulated by a hydrophilic thermoplastic polyetherurethane, said polyetherurethane comprising the reaction product of a diisocyanate, a chain extender and a polyetherglycol comprising at least 50% by weight polytetramethylene ether glycol.
Claim 8
Dependent Claim
75 words
A tubing comprising one or more discontinuous rods of a hydrophobic thermoplastic stiffening polymer, said stiffening polymer comprising at least 30% by weight of a polyurethane having a hard segment content of 70-100% and a Shore D hardness of about 50-80%, said discontinuous rod being encapsulated by a hydrophilic thermoplastic polyetherurethane, said polyetherurethane comprising the reaction product of a diisocyanate, a chain extender and a polyetherglycol comprising at least 50% by weight polytetramethylene ether glycol.
Claim 9
Dependent Claim
33 words
The tubing of claim 6 wherein said stiffening polymer comprises about 35% by weight of said polyurethane of 70 to 100% hard segment and about 65% by weight of said hydrophilic thermoplastic polyetherurethane.
Claim 10
Dependent Claim
31 words
The tubing of claim 6 wherein said stiffening polymer comprises about 50% by weight of said polyurethane of 70 to 100% hard segment and about 50% by weight of a polyester.
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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) | 1998-09-25 | 1999-03-27 | 1999-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-25 | 2003-03-27 | 2003-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-25 | 2007-03-27 | 2007-09-26 | $7700.00 | Window Closed / Lapsed |