Patent US3115777A successfully refreshed from Google Patents.
US5281677A
Expired / Lapsed
US
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Thermoplastic polyurethane blends
Assignee: Becton Dickinson and Co
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Filing: 1992-09-03
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Granted: 1994-01-25
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Expires: 2012-09-03
Abstract
Abstract A thermoplastic polyurethane chain extended with an alkylenediol is blended with a thermoplastic polyurethane chain extended with an oxyalkylene qlycol oligomer. The blend is extruded into a catheter tubing having sufficient initial stiffness for satisfactory insertion in a patient and a high degree of softening for safe positioning and long term catheterization procedures without the risk of vessel wall perforation.
Inventors
- 👤 Theo O. Onwunaka
- 👤 Fidelis C. Onwumere
- 👤 James M. Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:26
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/04; A61L29/06; C; C08; C08L; C08L75/00; C08L75/04; C08L75/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
44 words
A melt processable nonswelling blend comprising a first polyurethane chain extended with an oxyalkylene glycol oligomer and a second polyurethane comprising an alkylene glycol chain extender and a substantially non-hydrophilic soft segment selected from the group consisting of polyetherglycol and an amine terminated polyether.
Claim 2
Dependent Claim
44 words
A melt processable nonswelling blend comprising a first polyurethane chain extended with an oxyalkylene glycol oligomer and a second polyurethane comprising an alkylene glycol chain extender and a substantially non-hydrophilic soft segment selected from the group consisting of polyetherglycol and an amine terminated polyether.
Claim 3
Dependent Claim
24 words
The blend of claim 1 wherein said oligomer is selected from the group consisting of triethylene qlycol, dipropylene glycol, tripropylene qlycol, and tetraethylene glycol.
Claim 4
Dependent Claim
67 words
A melt processable nonswelling blend comprising a first polyurethane which is the reaction product of an aromatic diisocyanate, a substantially non-hydrophilic polyetherglycol soft segment and triethylene glycol chain extender and a second polyurethane which is the reaction product of an aromatic diisocyanate, an alkylene diol chain extender and a substantially non-hydrophilic soft segment selected from the group consisting of a polyether glycol and an amine terminated polyether.
Claim 5
Dependent Claim
67 words
A melt processable nonswelling blend comprising a first polyurethane which is the reaction product of an aromatic diisocyanate, a substantially non-hydrophilic polyetherglycol soft segment and triethylene glycol chain extender and a second polyurethane which is the reaction product of an aromatic diisocyanate, an alkylene diol chain extender and a substantially non-hydrophilic soft segment selected from the group consisting of a polyether glycol and an amine terminated polyether.
Claim 6
Dependent Claim
30 words
The blend of claim 3 in which the percentage of said first polyurethane is about 30 to 70 and the percentage of said second polyurethane is about 70 to 30.
Claim 7
Dependent Claim
22 words
The blend of claim 3 in which the hard segment content of said first and second polyurethanes is about 40 to 70.
Claim 8
Dependent Claim
24 words
The blend of claim 3 further comprising an agent selected from the group comprising a radiopaque agent, an antimicrobial agent and an antithrombogenic agent.
Claim 9
Dependent Claim
41 words
A melt processable nonswelling blend comprising a first polyurethane comprising the reaction product of an aromatic diisocyanate, polytetramethylene ether glycol and triethylene glycol and a second polyurethane which is the reaction product of an aromatic diisocyanate, polytetramethylene ether glycol and 1,4-butanediol.
Claim 10
Dependent Claim
41 words
A melt processable nonswelling blend comprising a first polyurethane comprising the reaction product of an aromatic diisocyanate, polytetramethylene ether glycol and triethylene glycol and a second polyurethane which is the reaction product of an aromatic diisocyanate, polytetramethylene ether glycol and 1,4-butanediol.
Claim 11
Dependent Claim
10 words
A medical article fabricated from the blend of claim 1.
Claim 12
Dependent Claim
9 words
The article of claim 8 which is a catheter.
Claim 13
Independent Claim
84 words
A method for preparing a softening, nonswelling tubing comprising: a) preparing a first polyurethane comprising the reaction product of a diisocyanate, a substantially non-hydrophilic polyetherglycol and an alkylene glycol chain extender; b) preparing a second polyurethane comprising the reaction product of a diisocyanate, a substantially non-hydrophilic polyetherglycol and an oxyalkylene glycol oligomer chain extender; c) preparing a blend having about 30-70% by weight of said first polyurethane and about 70-30% by weight of said second polyurethane; and d) extruding said blend into a tubing.
Claim 14
Independent Claim
84 words
A method for preparing a softening, nonswelling tubing comprising: a) preparing a first polyurethane comprising the reaction product of a diisocyanate, a substantially non-hydrophilic polyetherglycol and an alkylene glycol chain extender; b) preparing a second polyurethane comprising the reaction product of a diisocyanate, a substantially non-hydrophilic polyetherglycol and an oxyalkylene glycol oligomer chain extender; c) preparing a blend having about 30-70% by weight of said first polyurethane and about 70-30% by weight of said second polyurethane; and d) extruding said blend into a tubing.
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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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |