Patent US4979946A successfully refreshed from Google Patents.
US4979946A
Expired / Lapsed
US
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Environmental absorbent dressing
Assignee: Kendall Co
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Filing: 1989-04-07
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Granted: 1990-12-25
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Expires: 2009-04-07
Abstract
Abstract An environmental absorbent dressing having, an absorbent layer comprising a hydrogel, and a front sheet comprising a film capable of permitting passage of liquid covering a front surface of the absorbent layer and coated on a front surface thereof with a porous adhesive.
Inventors
- 👤 Thomas Gilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:10
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61F; A61F13/00; A61F13/02; A61F13/0203; A61F13/0206; A61F13/0213; A61F13/0223; A61F13/0226; A61L15/46; A61L15/58; A61F2013/00361; A61F2013/00727; A61F2013/00748; A61F2013/00761; A61F2013/00902; A61F2013/0091; A61F2013/00927; A61L2300/00; A61L2300/10; A61L2300/106; A61L2300/40; A61L2300/404
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A wound dressing adapted to absorb and retain wound fluids, comprising, in order: (1) a backing sheet for protecting the backside of said dressing; (2) a hydrogel layer adapted to absorb at least two hundred percent of its original weight in water; (3) a continuous front sheet covering only the surface of said hydrogel layer opposed from said backing sheet, said front sheet comprising a water-swellable, water-insoluble polymeric material which is characterized as being elastomeric when dry; and (4) a porous adhesive layer coated on the free outer surface of said front sheet for adhering said dressing to the skin covering said wound and for permitting passage of fluid from said wound therethrough.
Claim 2
Dependent Claim
113 words
A wound dressing adapted to absorb and retain wound fluids, comprising, in order: (1) a backing sheet for protecting the backside of said dressing; (2) a hydrogel layer adapted to absorb at least two hundred percent of its original weight in water; (3) a continuous front sheet covering only the surface of said hydrogel layer opposed from said backing sheet, said front sheet comprising a water-swellable, water-insoluble polymeric material which is characterized as being elastomeric when dry; and (4) a porous adhesive layer coated on the free outer surface of said front sheet for adhering said dressing to the skin covering said wound and for permitting passage of fluid from said wound therethrough.
Claim 3
Dependent Claim
24 words
A dressing as defined in claim 1 wherein at least one of said hydrogel layer and said front sheet includes a water soluble reagent.
Claim 4
Dependent Claim
14 words
A dressing as defined in claim 2 wherein said reagent comprises an anti-microbial agent.
Claim 5
Dependent Claim
13 words
A dressing as defined in claim 3 wherein said anti-microbial agent is iodine.
Claim 6
Dependent Claim
28 words
A dressing as defined in claim 1 wherein the dressing is capable of handling the production of water at rates of the order of 3000 mg/72 hrs/sq cm.
Claim 7
Dependent Claim
21 words
A dressing as defined in claim 1 wherein the front sheet swells at least 30% of its original dimensions in water.
Claim 8
Dependent Claim
23 words
A dressing as defined in claim 6 wherein the front sheet allows water transport at a rate of more than 260 mg/sq cm/day.
Claim 9
Dependent Claim
21 words
A dressing as defined in claim 1 wherein said polymeric material comprises a block polymer having hard segments and soft segments.
Claim 10
Dependent Claim
24 words
A dressing as defined in claim 23 wherein the hard segments are selected from the group consisting of nylon, polyester, polyurethane, polystyrene, and polycarbonate.
Claim 11
Dependent Claim
18 words
A dressing as defined in claim 9 wherein the hard segments are glass or crystalline at room temperature.
Claim 12
Dependent Claim
14 words
A dressing as defined in claim 8 wherein the soft segments comprise a polyether.
Claim 13
Dependent Claim
23 words
A dressing as defined in claim 11 wherein the soft segments are above their glass transition temperature and are flexible at room temperature.
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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) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |