US4487808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical article having a hydrophilic coating
Assignee: Astra Tech AB
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Filing: 1984-04-25
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Granted: 1984-12-11
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Expires: 2004-04-25
Abstract
Abstract A process for coating a polymer surface with a hydrophilic coating with low friction in wet condition. The process comprises applying to the polymer surface a solution containing between 0.05 to 40% of a compound which comprises at least two unreacted isocyanate groups per molecule, evaporating the solvent, applying a solution containing between 0.5 to 50% of polyethylene oxide to the thus treated polymer surface and then evaporating the solvent of the last mentioned solution, and curing the coating at elevated temperature. The process is preferably carried out in the presence of a catalyst for the curing of isocyanate.
Inventors
- 👤 Hans R. Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:10
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/08; A61L29/085; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/046; C08J7/056; C08J2423/00; C08J2423/02; C08J2423/04; C08J2423/06; C08J2475/00; C08J2475/04; C08J2475/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31573
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A medical article for insertion in the body which is provided with a hydrophilic coating by applying to the article a solution containing between 0.05 to 40% (weight to volume) of a compound which comprises at least two unreacted isocyanate groups per molecule, evaporating the solvent, applying a second solution containing between 0.5 to 50 % (weight to volume) of polyethylene oxide having a mean molecular weight of between 10 4 to 10 -7 to the thus treated article and then evaporating the solvent of the second solution, and curing the coating at elevated temperature.
Claim 2
Dependent Claim
95 words
A medical article for insertion in the body which is provided with a hydrophilic coating by applying to the article a solution containing between 0.05 to 40% (weight to volume) of a compound which comprises at least two unreacted isocyanate groups per molecule, evaporating the solvent, applying a second solution containing between 0.5 to 50 % (weight to volume) of polyethylene oxide having a mean molecular weight of between 10 4 to 10 -7 to the thus treated article and then evaporating the solvent of the second solution, and curing the coating at elevated temperature.
Claim 3
Dependent Claim
28 words
A medical article according to claim 1 wherein the solution of polyethylene oxide or the solution of isocyanate contains a catalyst that accelerates the curing of the isocyanate.
Claim 4
Dependent Claim
13 words
A medical article according to claim 2 wherein the catalyst comprises an amine.
Claim 5
Dependent Claim
16 words
A medical article according to claim 2 wherein the catalyst comprises a diamine or triethylene diamine.
Claim 6
Dependent Claim
17 words
A medical article according to claims 1, 2 or 3 wherein the isocyanate solution contains a polymer.
Claim 7
Dependent Claim
29 words
A medical article according to claim 5 wherein the polymer in the isocyanate solution is selected from the group consisting of polyesters, polyvinyl compounds, polyurethanes, polyisocyanates, or copolymers thereof.
Claim 8
Dependent Claim
19 words
A medical article according to claim 1 wherein the curing is performed in the presence of a water-containing gas.
Claim 9
Dependent Claim
27 words
A medical article according to claim 1 wherein the polymer surface to be coated comprises a polymer selected from the group consisting of latex, polyvinylchloride, and polyurethane.
Claim 10
Dependent Claim
15 words
A medical article according to claim 1 wherein the hydrophilic coating is treated with iodine.
Claim 11
Dependent Claim
11 words
A medical article according to claim 1 which comprises a catheter.
References Cited (Backward Citations)
GB1600963A
Cited
US4232608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |