US5147338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medicated, low adherency wound dressings
Assignee: Smith and Nephew PLC
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Filing: 1991-06-17
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Granted: 1992-09-15
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Expires: 2011-06-17
Abstract
Abstract The present invention is directed to the manufacture and use of absorptive wound dressings for treatment of burns and other wounds wherein the dressing has a reduced tendency to adhere to the wound and can act as a bacterial barrier. The wound dressing is comprised of a wound facing layer, an intermediate absorbent layer and an outer layer. The wound dressing of the present invention also has a topically effective medicament for treatment of burns and other wounds.
Inventors
- 👤 Stephen M. Lang
- 👤 David F. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:03
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/46; A61F; A61F13/00; A61F13/00051; A61F13/00063; A61F13/01; A61F13/01034; A61F13/01046; A61L15/22; 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; A61F2013/00251; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00761; A61F2013/00855; A61F2013/00859; 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: 15
Claim 1
Independent Claim
120 words
A conformable, low adherency wound dressing which comprises: (a) A low adherency wound facing layer 0.05-2.5 mm thick which is a conformable elastomeric apertured net; (b) An absorbent layer comprising a conformable hydrophilic foam 0.5-20 mm thick; (c) A therapeutically effective amount of a medicament suitable for a topical application to humans located in the hydrophilic foam layer; and (d) A continuous conformable moisture vapor permeable outer film layer which acts as a bacterial barrier and has a moisture vapor transmission rate of from 300-5,000 grams/sq. meter/24 hours at 37° C. at 100%-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
120 words
A conformable, low adherency wound dressing which comprises: (a) A low adherency wound facing layer 0.05-2.5 mm thick which is a conformable elastomeric apertured net; (b) An absorbent layer comprising a conformable hydrophilic foam 0.5-20 mm thick; (c) A therapeutically effective amount of a medicament suitable for a topical application to humans located in the hydrophilic foam layer; and (d) A continuous conformable moisture vapor permeable outer film layer which acts as a bacterial barrier and has a moisture vapor transmission rate of from 300-5,000 grams/sq. meter/24 hours at 37° C. at 100%-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
19 words
A dressing, according to claim 1, in which the medicament comprises an antibacterially effective amount of an antibacterial agent.
Claim 4
Dependent Claim
16 words
A dressing, according to claim 1, in which the conformable elastomeric net comprises an integral net.
Claim 5
Dependent Claim
17 words
A dressing, according to claim 1, in which the conformable elastomeric net has forty apertures per cm.
Claim 6
Dependent Claim
16 words
A dressing, according to claim 1, in which the conformable elastomeric net comprises a polyurethane film.
Claim 7
Dependent Claim
30 words
A dressing, according to claim 1, in which the continuous conformable layer has a moisture vapor transmission rate of 500-2,000 grams/sq. meters/24 hours at 37° at 100%-10% relative humidity difference.
Claim 8
Dependent Claim
20 words
A dressing, according to claim 1, in which the continuous moisture vapor transmitting conformable film layer comprises a polyurethane film.
Claim 9
Dependent Claim
20 words
A dressing, according to claim 1, in which the conformable outer film layer comprises a moisture vapor transmitting adhesive layer.
Claim 10
Dependent Claim
18 words
A dressing, according to claim 1, in which the conformable hydrophilic foam is a foam of hydrophilic polymer.
Claim 11
Dependent Claim
14 words
A dressing, according to claim 9, in which the hydrophilic polymer is hydrophilic polyurethane.
Claim 12
Dependent Claim
23 words
A dressing, according to claim 1, in which the hydrophilic foam comprises an open cell foam with a cell size of 50-500 microns.
Claim 13
Dependent Claim
28 words
A dressing, according to claim 1, in which the hydrophilic foam comprises an open cell foam in which 30%-60% of the total area of the foam are openings.
Claim 14
Dependent Claim
130 words
A packaged sterile conformable, low adherency wound dressing which comprises: (a) A low adherency wound facing layer 0.05-2.5 mm thick which is a conformable elastomeric apertured net; (b) An absorbent layer comprising a conformable hydrophilic foam 0.5-20 mm thick; (c) A therapeutically effective amount of medicament suitable for a topical application to humans located in the hydrophilic foam layer; and (d) A continuous conformable moisture vapor permeable outer film layer which acts as a bacterial barrier and has a moisture vapor transmission rate of from 300-5,000 grams/sq. meter/24 hours at 37° C. at 100%-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, wherein said sterile dressing is within a bacteria-impervious package.
Claim 15
Dependent Claim
130 words
A packaged sterile conformable, low adherency wound dressing which comprises: (a) A low adherency wound facing layer 0.05-2.5 mm thick which is a conformable elastomeric apertured net; (b) An absorbent layer comprising a conformable hydrophilic foam 0.5-20 mm thick; (c) A therapeutically effective amount of medicament suitable for a topical application to humans located in the hydrophilic foam layer; and (d) A continuous conformable moisture vapor permeable outer film layer which acts as a bacterial barrier and has a moisture vapor transmission rate of from 300-5,000 grams/sq. meter/24 hours at 37° C. at 100%-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, wherein said sterile dressing is 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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |