US5077352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible lubricious organic coatings
Assignee: Medtronic Vascular Inc
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Filing: 1990-04-23
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Granted: 1991-12-31
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Expires: 2010-04-23
Abstract
Abstract A flexible, lubricious organic polymeric coating is formed by applying a mixture of an isocyanate, a polyol, poly(ethylene oxide), and carrier liquid to a surface to be coated. The carrier liquid is removed and the mixture reacted to form a polyurethane coating with associated poly(ethylene oxide) giving a highly lubricious, abrasion resistant, flexible coating particularly suitable for use as a protective lubricious coating on devices introduced into the body.
Inventors
- 👤 Richard K. Elton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:22
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/08; A61L29/085; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852; C08G18/0857; C08G18/28; C08G18/30; C08G18/36; C08G18/40; C08G18/4009; C08G18/4018; C08G18/48; C08G18/4833; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8022; C08G18/8029; C09; C09D; C09D175/00; C09D175/04; A61L2400/00; A61L2400/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A method of preparing an abrasion resistant hydrophilic lubricious, organic coating on an organic substrate to be coated, said method comprising forming a mixture of an isocyanate, a polyol and a poly(ethylene oxide) in a carrier liquid, removing at least a portion of said carrier liquid, and heating and curing to form a coating substantially of a polyurethane complexed with poly(ethylene oxide) having good adherence to the substrate and good anti-friction properties.
Claim 2
Independent Claim
72 words
A method of preparing an abrasion resistant hydrophilic lubricious, organic coating on an organic substrate to be coated, said method comprising forming a mixture of an isocyanate, a polyol and a poly(ethylene oxide) in a carrier liquid, removing at least a portion of said carrier liquid, and heating and curing to form a coating substantially of a polyurethane complexed with poly(ethylene oxide) having good adherence to the substrate and good anti-friction properties.
Claim 3
Dependent Claim
36 words
A method of forming an abrasion resistant coating in accordance with claim 1 wherein said mixture has a stoichimetric ratio of total NCO groups to total OH groups in the range of from 0.05 to 1.5.
Claim 4
Dependent Claim
24 words
A method in accordance with claim 2 wherein said carrier liquid is an organic solvent capable of solubilizing said polyol, isocyanate and poly(ethylene oxide).
Claim 5
Independent Claim
87 words
A method of preparing an abrasion resistant, hydrophilic, lubricious organic coating comprising, forming a reaction mixture containing an isocyanate, a polyol and a poly(ethylene oxide) having a molecular weight in the range of from 50,000 to 5,000,000, said mixture being dissolved in a solvent to form a uniform solution, applying said solution to an organic substrate to form a coating, removing said solvent, and curing said coating to allow said polyol and isocyanate to react to form a cross-linked substantially polyurethane matrix associated with the poly(ethylene oxide).
Claim 6
Independent Claim
87 words
A method of preparing an abrasion resistant, hydrophilic, lubricious organic coating comprising, forming a reaction mixture containing an isocyanate, a polyol and a poly(ethylene oxide) having a molecular weight in the range of from 50,000 to 5,000,000, said mixture being dissolved in a solvent to form a uniform solution, applying said solution to an organic substrate to form a coating, removing said solvent, and curing said coating to allow said polyol and isocyanate to react to form a cross-linked substantially polyurethane matrix associated with the poly(ethylene oxide).
Claim 7
Dependent Claim
36 words
A method in accordance with the method of claim 4 wherein said curing is carried out at a temperature of 70° F. to 350° F. for a time period of from 2 minutes to 72 hours.
Claim 8
Dependent Claim
22 words
A method in accordance with the method of claim 4 wherein said substrate is a catheter and said coating overlies said catheter.
Claim 9
Dependent Claim
25 words
A method in accordance with the method of claim 6 wherein isocyanate and polyol have a ratio to poly(ethylene oxide) of from 0.25 to 6.0.
References Cited (Backward Citations)
US4459317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |