US4995382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressing, manufacture and use
Assignee: Smith and Nephew PLC
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Filing: 1989-04-28
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Granted: 1991-02-26
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Expires: 2009-04-28
Abstract
Abstract A wound dressing which comprises an absorbent layer comprising an open cell foam of a hydrophilic polymer and a wound facing layer comprising either a conformable net of elastomer coated with adhesive on its wound facing surface or an adhesive layer, pattern spread in a conformable net-like configuration, the dressing optionally also having a conformable moisture vapour transmitting outer layer; 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
2026-11-05 18:24
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61F; A61F13/00; A61F13/02; A61F13/023; A61F13/0243; A61F13/15; A61F13/51; A61F13/511; A61F13/51121; A61F13/512; A61L15/22; A61L15/24; A61L15/26; A61L15/425; A61F13/53; A61F13/534; A61F13/539; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00119; A61F2013/00157; A61F2013/00217; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00655; A61F2013/00697; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00761; A61F2013/00782; A61F13/15577; A61F2013/15821; A61F2013/530802; A61F2013/53445; A61F2013/5395
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A wound dressing which consists essentially of a low adherency wound facing layer, an absorbent layer and an outer layer, wherein said low adherency wound facing layer has a wound contacting, first adhesive coating over its wound facing surface, said low adherency wound facing layer comprises a conformable apertured film, a conformable net of elastomer or an adhesive layer pattern spread in a conformable net-like configuration, the absorbent layer comprises a conformable hydrophilic foam and the outer layer is a continuous or discontinuous moisture vapour transmitting conformable backing layer which has a layer of a second adhesive on one surface thereof, at least one of said backing layer and said second adhesive layer being continuous to provide a barrier to bacteria and to liquid water.
Claim 2
Dependent Claim
125 words
A wound dressing which consists essentially of a low adherency wound facing layer, an absorbent layer and an outer layer, wherein said low adherency wound facing layer has a wound contacting, first adhesive coating over its wound facing surface, said low adherency wound facing layer comprises a conformable apertured film, a conformable net of elastomer or an adhesive layer pattern spread in a conformable net-like configuration, the absorbent layer comprises a conformable hydrophilic foam and the outer layer is a continuous or discontinuous moisture vapour transmitting conformable backing layer which has a layer of a second adhesive on one surface thereof, at least one of said backing layer and said second adhesive layer being continuous to provide a barrier to bacteria and to liquid water.
Claim 3
Dependent Claim
20 words
A wound dressing according to claim 1 wherein the absorbent layer comprises an open cell foam of a hydrophilic polymer.
Claim 4
Dependent Claim
15 words
A wound dressing according to claim 2 wherein the hydrophilic polymer is a hydrophilic polyurethane.
Claim 5
Dependent Claim
18 words
A wound dressing according to claim 1 wherein the wound facing layer comprises a conformable net of elastomer.
Claim 6
Dependent Claim
27 words
A wound dressing according to claim 1 wherein the wound facing layer comprises an adhesive layer, pattern spread in a conformable net-like configuration onto the absorbent layer.
Claim 7
Dependent Claim
27 words
A wound dressing according to claim 1 wherein the first adhesive is an acrylate ester copolymer pressure sensitive adhesive or a polyvinyl ethyl ether pressure sensitive adhesive.
Claim 8
Dependent Claim
36 words
A wound dressing according to claim 6 wherein the first adhesive is an acrylate ester polymer pressure sensitive adhesive or a polyvinyl ethyl ether pressure sensitive adhesive, and has a thickness of 25 to 50 microns.
Claim 9
Dependent Claim
50 words
A wound dressing according to claim 1 wherein the outer layer comprises a conformable moisture vapour transmitting layer, the intermediate absorbent layer comprises an open cell foam of hydrophilic polymer and the wound facing layer comprises an adhesive layer, pattern spread in a conformable net-like configuration onto the absorbent layer.
Claim 10
Dependent Claim
16 words
A wound dressing according to claim 1 wherein the outer layer is a continuous conformable film.
Claim 11
Dependent Claim
72 words
A wound dressing which consists essentially of a low adherency wound facing layer, and an absorbent layer said low adherency wound facing layer having a wound contacting first adhesive coating over its wound facing surface, wherein said low adherency wound facing layer comprises a conformable aperture film, a conformable net of elastomer or an adhesive layer pattern spread in a conformable net-like configuration, and the absorbent layer comprises a conformable hydrophilic foam.
Claim 12
Dependent Claim
72 words
A wound dressing which consists essentially of a low adherency wound facing layer, and an absorbent layer said low adherency wound facing layer having a wound contacting first adhesive coating over its wound facing surface, wherein said low adherency wound facing layer comprises a conformable aperture film, a conformable net of elastomer or an adhesive layer pattern spread in a conformable net-like configuration, and the absorbent layer comprises a conformable hydrophilic foam.
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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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |