US5156601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tacky, hydrophilic gel dressings and products therefrom
Assignee: Hydromer Inc
•
Filing: 1991-03-20
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Granted: 1992-10-20
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Expires: 2011-03-20
Abstract
Abstract A dressing includes a stable, tacky gel of polyurethane and poly(N-vinyl lactam), the poly(N-vinyl lactam) having a K-value of at least about 60 and mole equivalents of acid groups above about 1.4. The dressing may also include a substrate and various additives incorporated with the gel.
Inventors
- 👤 Donald H. Lorenz
- 👤 Connie C. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:08
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/07; A61L15/12; A61L26/00; A61L26/0061; A61L26/008; A61L15/16; A61L15/22; A61L15/225; A61L26/0009; A61L26/0052; A61P; A61P11/00; A61P11/08; A61P25/00; A61P25/02; A61P27/00; A61P27/02; A61P29/00; A61P31/00; A61P31/04; A61P9/00; A61P9/08; A61P9/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
48 words
A dressing comprising a stable, tacky, hydrophilic gel which comprises a blend of polyurethane and a hydrophilic poly(N-vinyl lactam) having a K value calculated according to Finkentscher's formula of at least about 60 and above about 1.4 mole equivalents of available acid groups per mole of poly(N-vinyl lactam).
Claim 2
Dependent Claim
48 words
A dressing comprising a stable, tacky, hydrophilic gel which comprises a blend of polyurethane and a hydrophilic poly(N-vinyl lactam) having a K value calculated according to Finkentscher's formula of at least about 60 and above about 1.4 mole equivalents of available acid groups per mole of poly(N-vinyl lactam).
Claim 3
Dependent Claim
12 words
The dressing of claim 1 which further comprises at least one substrate.
Claim 4
Dependent Claim
15 words
The dressing of claim 1 wherein the poly(N-vinyl lactam) comprises polyvinylpyrrolidone homopolymer, copolymer or terpolymer.
Claim 5
Dependent Claim
20 words
The dressing of claim 1 wherein the gel comprises a poly(N-vinyl lactam)/polyurethane ratio of from about 75/1 to about 4/1.
Claim 6
Dependent Claim
23 words
The dressing of claim 1 wherein the gel further comprises an aqueous solution containing at least 5 weight percent poly(N-vinyl lactam) and polyurethane.
Claim 7
Dependent Claim
13 words
The dressing of claim 5 wherein the solution comprises water or a hydroalcohol.
Claim 8
Dependent Claim
21 words
The dressing of claim 1 wherein the poly(N-vinyl lactam) has mole equivalents of available acid groups of at least about 2.0.
Claim 9
Dependent Claim
26 words
The dressing of claim 2 wherein the substrate is selected from a group consisting of polymer film, silicone-polytetrafluorethylene film, collagen film, woven fabric, and non-woven fabric.
Claim 10
Dependent Claim
12 words
The dressing of claim 2 wherein the substrate is a polyurethane film.
Claim 11
Dependent Claim
12 words
The dressing of claim 2 wherein the substrate is a silicone-polytetrafluoroethylene film.
Claim 12
Dependent Claim
10 words
The dressing of claim 2 wherein the substrate is stretchable.
Claim 13
Dependent Claim
12 words
The dressing of claim 2 wherein one substrate is a release liner.
Claim 14
Dependent Claim
14 words
The dressing of claim 1 wherein the gel comprises at least one additional ingredient.
Claim 15
Dependent Claim
14 words
The dressing of claim 13 wherein the additional ingredient is glycerine or propylene glycol.
Claim 16
Dependent Claim
14 words
The dressing of claim 13 wherein the additional ingredient is releasable from the gel.
Claim 17
Dependent Claim
12 words
The dressing of claim 15 wherein the additional ingredient is a fragrance.
Claim 18
Dependent Claim
24 words
The dressing of claim 15 wherein the additional ingredient is a biologically active material having curative or therapeutic value for human or non-human animals.
Claim 19
Dependent Claim
34 words
The dressing of claim 17 wherein the additional ingredient is selected from a group consisting of nitroglycerine, scopalamine, pilocarpine, phenylpropanolamine, theophyline, tetracycline, neomycin, oxytetracycline, triclosan, sodium cefazolin, silver sulfadiazine, salicylates, nicotinates, capsaicin and benzocaine.
Claim 20
Dependent Claim
38 words
The dressing of claim 1 selected from a group consisting of wound dressings, burn dressings, drug delivery dressings, antimicrobial interface dressings for anchoring medical devices to the skin, sports wrap dressings, cosmetic mask dressings and cosmetic wrap dressings.
Claim 21
Dependent Claim
70 words
A stable, tacky, hydrophilic gel which comprises a blend of polyurethane and a hydrophilic poly(N-vinyl lactam) having a K value calculated according to Finkentscher's formula of at least about 60 and above about 1.4 mole equivalents of available acid groups per mole of poly(N-vinyl lactam), at least five weight percent polyurethane and poly(N-vinyl lactam) combined and a polyurethane/poly(N-vinyl lactam) ratio from about 0.5/1 to about 8/1 in an aqueous solution.
Claim 22
Dependent Claim
70 words
A stable, tacky, hydrophilic gel which comprises a blend of polyurethane and a hydrophilic poly(N-vinyl lactam) having a K value calculated according to Finkentscher's formula of at least about 60 and above about 1.4 mole equivalents of available acid groups per mole of poly(N-vinyl lactam), at least five weight percent polyurethane and poly(N-vinyl lactam) combined and a polyurethane/poly(N-vinyl lactam) ratio from about 0.5/1 to about 8/1 in an aqueous solution.
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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) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |