US5445604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressing with conformable elastomeric wound contact layer
Assignee: Smith and Nephew PLC
•
Filing: 1993-10-15
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Granted: 1995-08-29
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Expires: 2013-10-15
Abstract
Abstract Low adherency wound dressings which comprise a wound facing layer, an intermediate absorbent layer and an outer layer characterized in that the wound facing layer comprises a conformable elastomeric apertured film, the intermediate absorbent layer comprises a conformable hydrophilic foam and the outer layer comprises a continuous moisture vapor transmitting conformable film; materials therefor and processes for the manufacture thereof are described.
Inventors
- 👤 Stephen M. Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:43
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/46; A61F; A61F13/00; A61F13/01; A61F13/01034; A61F13/01046; A61F13/06; A61F13/08; A61F13/15; A61F13/51; A61F13/511; A61F13/51121; A61F13/512; A61K; A61K31/00; A61K31/185; A61K31/19; A61K31/33; A61K31/395; A61K31/435; A61K31/47; A61K31/485; A61K31/495; A61K31/505; A61K31/519; A61K31/52; A61K31/56; A61K31/57; A61L15/22; A61L15/26; A61L15/425; A61F13/064; A61F13/069; A61F13/53; A61F13/534; A61F13/539; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00119; A61F2013/00157; A61F2013/00217; A61F2013/00246; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00655; A61F2013/00697; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00761; A61F2013/00782; A61F2013/00855; A61F2013/00876; A61F2013/00902; A61F2013/0091; A61F13/15577; A61F2013/15821; A61F2013/530802; A61F2013/53445; A61F2013/5395; A61L2300/00; A61L2300/40; A61L2300/404
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
A conformable low adherency wound dressing which comprises (a) a low adherency wound facing layer 0.05 to 2.5 mm thick which is a conformable elastomeric apertured net; (b) an absorbent layer comprising a conformable hydrophilic foam 0.5 to 20 mm thick; and (c) a continuous conformable moisture vapour permeable outer film layer which acts as a bacterial barrier and has a moisture vapour transmission rate of from 300 to 5000 grams/square meter/24 hours at 37° C. at 100% to 10% relative humidity difference, said wound facing layer and said outer layer being laminated to opposing faces of said absorbent layer over the operative area of the dressing.
Claim 2
Dependent Claim
107 words
A conformable low adherency wound dressing which comprises (a) a low adherency wound facing layer 0.05 to 2.5 mm thick which is a conformable elastomeric apertured net; (b) an absorbent layer comprising a conformable hydrophilic foam 0.5 to 20 mm thick; and (c) a continuous conformable moisture vapour permeable outer film layer which acts as a bacterial barrier and has a moisture vapour transmission rate of from 300 to 5000 grams/square meter/24 hours at 37° C. at 100% to 10% relative humidity difference, said wound facing layer and said outer layer being laminated to opposing faces of said absorbent layer over the operative area of the dressing.
Claim 3
Dependent Claim
16 words
A dressing according to claim 1, in which the conformable elastomeric net comprises an integral net.
Claim 4
Dependent Claim
19 words
A dressing according to claim 1, in which the conformable elastomeric net has 4 to 40 apertures per cm.
Claim 5
Dependent Claim
15 words
A dressing according to claim 1, in which the conformable elastomeric net comprises a polyurethane.
Claim 6
Dependent Claim
35 words
A dressing according to claim 1, in which the continuous conformable layer has a moisture vapour transmission rate of 500 to 2000 grams/square meter/24 hours at 37° C. at 100% to 10% relative humidity difference.
Claim 7
Dependent Claim
19 words
A dressing according to claim 1, in which the continuous moisture vapour transmitting conformable film layer comprises a polyurethane.
Claim 8
Dependent Claim
20 words
A dressing according to claim 1, in which the conformable outer film layer comprises a moisture vapour transmitting adhesive layer.
Claim 9
Dependent Claim
18 words
A dressing according to claim 1, in which the conformable hydrophilic foam is a foam of hydrophilic polymer.
Claim 10
Dependent Claim
14 words
A dressing according to claim 8, in which the hydrophilic polymer is hydrophilic polyurethane.
Claim 11
Dependent Claim
25 words
A dressing according to claim 1, in which the hydrophilic foam comprises an open cell foam with a cell size of 50 to 500 microns.
Claim 12
Dependent Claim
31 words
A dressing according to claim 1, in which the hydrophilic foam comprises an open cell foam in which 30% to 60% of the total area of the cells are membrane openings.
Claim 13
Dependent Claim
12 words
A sterile dressing according to claim 1, within a bacteria impervious package.
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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) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |