Patent US4860737A successfully refreshed from Google Patents.
US4860737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressing, manufacture and use
Assignee: Smith and Nephew PLC
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Filing: 1983-08-11
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Granted: 1989-08-29
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Expires: 2003-08-11
Abstract
Abstract A low adherency wound dressing which comprises a wound facing layer, an intermediate absorbent layer and an outer layer wherein the wound facing layer comprises a conformable net of elastomer, the intermediate absorbent layer comprises a conformable open cell foam of hydrophilic polymer, and the outer layer comprises a conformable microporous film; and a process for making said dressing.
Inventors
- 👤 Stephen M. Lang
- 👤 David F. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:30
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61F; A61F13/00; A61F13/01; A61F13/01034; A61F13/02; A61F13/023; A61L15/22; A61L15/24; A61L15/26; A61L15/425; A61F13/15; A61F13/53; A61F13/534; A61F13/539; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00119; A61F2013/00157; A61F2013/00217; A61F2013/00246; A61F2013/00255; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00544; A61F2013/00548; A61F2013/00855; A61F2013/00863; A61F2013/00876; A61F2013/00902; A61F2013/0091; A61F13/15577; A61F2013/15821; A61F2013/530802; A61F2013/53445; A61F2013/5395
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
60 words
A laminate wound dressing which consists essentially of a low adherency wound facing layer, an absorbent layer and an outer layer laminated together wherein the wound facing layer comprises a conformable net of elastomer, the absorbent layer comprises a conformable hydrophilic foam and the outer layer comprises a conformable microporous film which is a barrier to bacteria and liquid water.
Claim 2
Dependent Claim
60 words
A laminate wound dressing which consists essentially of a low adherency wound facing layer, an absorbent layer and an outer layer laminated together wherein the wound facing layer comprises a conformable net of elastomer, the absorbent layer comprises a conformable hydrophilic foam and the outer layer comprises a conformable microporous film which is a barrier to bacteria and liquid water.
Claim 3
Dependent Claim
47 words
A wound dressing according to claim 1 which consists essentially of a wound facing layer which is a conformable net of elastomer, an intermediate absorbent layer and an outer layer, both as defined in claim 1, optionally with a topically effective medicament in the intermediate absorbent layer.
Claim 4
Dependent Claim
34 words
A wound dressing according to claim 1, wherein the outer layer has a moisture vapour transmission rate of 500 to 4000 grams/square meter/24 hours at 37.5° C. at 100% to 10% relative humidity difference.
Claim 5
Dependent Claim
23 words
A wound dressing according to claim 1 wherein the microporous film outer layer has a mean pore diameter of 0.01 to 2 microns.
Claim 6
Dependent Claim
21 words
A wound dressing according to claim 1 wherein the microporous film outer layer has a thickness of 50 to 300 microns.
Claim 7
Dependent Claim
63 words
A wound dressing according to claim 1 wherein the outer layer is a microporous plasticised polyvinyl chloride film having an average pore diameter of 0.01 to 2 microns, a thickness of 250 to 300 microns and a moisture vapour transmission rate of 300 to 5000 g/m 2 /24 hours at 37.5° C. at a relative humidity difference of 100% to 10% relative humidity.
Claim 8
Dependent Claim
17 words
A wound dressing according to claim 6, wherein the average pore diameter is 0.01 to 0.1 microns.
Claim 9
Dependent Claim
36 words
A wound dressing according to claim 6, wherein the intermediate absorbent layer is a cross-linked hydrophilic polyurethane foam made by reacting a hydrophilic isocyanate terminated polyether prepolymer with water, and optionally contains a topically effective medicament.
Claim 10
Dependent Claim
16 words
A wound dressing according to claim 6, wherein the wound facing layer is an integral net.
Claim 11
Dependent Claim
16 words
A wound dressing according to claim 1 wherein the wound facing layer is made of polyurethane.
Claim 12
Dependent Claim
14 words
A wound dressing according to claim 1 wherein the outer layer is microporous polyvinylchloride.
References Cited (Backward Citations)
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |