US5409472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive polymeric foam dressings
Assignee: Beiersdorf AG
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Filing: 1993-04-05
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Granted: 1995-04-25
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Expires: 2013-04-05
Abstract
Abstract A conformable wound dressing is produced which comprises a polymeric foam absorbent layer, a continuous or discontinuous adhesive layer covering the body facing surface of the absorbent layer except for a wound contacting area which is free of adhesive and a layer of a liquid impervious moisture vapor permeable material disposed over substantially all or the entire surface of the absorbent layer opposite the body facing surface. The wound dressing may have a discontinuous intermediate layer coextensive with the absorbent layer disposed between the absorbent layer and the adhesive layer. Preferably, more than 50% of the absorbent layer is free of adhesive or when the adhesive is placed on the intermediate layer, more than 50% of the absorbent layer and the intermediate layer are free of adhesive.
Inventors
- 👤 David A. Rawlings
- 👤 Patrick L. Blott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:01
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61F; A61F13/00; A61F13/02; A61F13/023; A61L15/22; A61L15/225; A61L15/26; A61L15/425; A61F2013/00361; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00855; A61F2013/00863; A61F2013/00868; A61F2013/00876
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
120 words
A conformable wound dressing which comprises a polymeric foam absorbent layer, having a body facing surface, a continuous or discontinuous adhesive layer covering the body facing surface of the absorbent layer except for a wound contacting area which is free of adhesive and a layer of a liquid impervious moisture vapor permeable material disposed over substantially all of the entire surface of the absorbent layer opposite the body facing surface, wherein the adhesive layer is confined to the edges of the absorbent layer and more than 40% of the absorbent layer is free of adhesive, and wherein the thickness of the absorbent layer at two opposed margins is substantially less than the thickness of the absorbent layer between the margins.
Claim 2
Dependent Claim
120 words
A conformable wound dressing which comprises a polymeric foam absorbent layer, having a body facing surface, a continuous or discontinuous adhesive layer covering the body facing surface of the absorbent layer except for a wound contacting area which is free of adhesive and a layer of a liquid impervious moisture vapor permeable material disposed over substantially all of the entire surface of the absorbent layer opposite the body facing surface, wherein the adhesive layer is confined to the edges of the absorbent layer and more than 40% of the absorbent layer is free of adhesive, and wherein the thickness of the absorbent layer at two opposed margins is substantially less than the thickness of the absorbent layer between the margins.
Claim 3
Dependent Claim
19 words
A wound dressing according to claim 1 wherein more than 50% of the absorbent layer is free of adhesive.
Claim 4
Dependent Claim
19 words
A wound dressing according to claim 2 wherein more than 85% of the adhesive layer is free of adhesive.
Claim 5
Dependent Claim
24 words
A wound dressing according to claim 2 wherein the adhesive free area is centrally located on the body facing surface of the absorbent layer.
Claim 6
Dependent Claim
15 words
A wound dressing according to claim 4 wherein the adhesive layer is a continuous one.
Claim 7
Dependent Claim
20 words
A wound dressing according to claim 4 further comprising a release coated protector on the adhesive surface of the dressing.
Claim 8
Dependent Claim
34 words
A wound dressing according to claim 2, said wound dressing having a moisture vapor transmission rate of at least 300 grams/m 2 /24 hrs. at 37.5° C. at 100% to 10% relative humidity difference.
Claim 9
Dependent Claim
34 words
A wound dressing according to claim 7, said wound dressing having a moisture vapor transmission rate of at least 500 grams/m 2 /24 hrs. at 37.5° C. at 100% to 10% relative humidity difference.
Claim 10
Dependent Claim
28 words
A wound dressing according to claim 1 which further comprises a discontinuous intermediate layer coextensive with the absorbent layer disposed between the absorbent layer and the adhesive layer.
Claim 11
Dependent Claim
15 words
A wound dressing according to claim 9 wherein the adhesive layer is a discontinuous layer.
Claim 12
Dependent Claim
22 words
A wound dressing according to claim 9 wherein the adhesive layer forms discontinuities which register with the discontinuities of the intermediate layer.
Claim 13
Dependent Claim
19 words
A wound dressing according to claim 9 wherein the intermediate discontinuous layer is in the form of a net.
Claim 14
Dependent Claim
14 words
A wound dressing according to claim 12 wherein the net is a polyurethane net.
Claim 15
Dependent Claim
17 words
A wound dressing according to claim 1 wherein the polymeric foam is made from a hydrophilic polymer
Claim 16
Dependent Claim
15 words
A wound dressing according to claim 1 wherein the polymeric foam is a polyurethane foam.
Claim 17
Dependent Claim
12 words
A wound dressing according to claim 1 wherein the adhesive is colored.
Claim 18
Dependent Claim
18 words
A wound dressing according to claim 1 wherein the absorbent layer contains a therapeutically effective amount of medicament.
Claim 19
Dependent Claim
19 words
A wound dressing according to claim 9 wherein the discontinuous intermediate layer contains a therapeutically effective amount of medicament.
Claim 20
Dependent Claim
27 words
A wound dressing according to claim 1 wherein the adhesive free area is located on the thicker portion of the body facing surface of the absorbent layer.
Claim 21
Dependent Claim
15 words
A wound dressing according to claim 19 wherein the adhesive layer is a continuous one.
Claim 22
Dependent Claim
20 words
A wound dressing according to claim 19 further comprising a release coated protector on the adhesive surface of the dressing.
Claim 23
Dependent Claim
30 words
A wound dressing according to claim 1 wherein the thickness of the absorbent layer at the margins is less than half the thickness of the absorbent layer between the margins.
Claim 24
Dependent Claim
22 words
A wound dressing according to claim 18 wherein the thickness of the absorbent material between the margins is up to 2.5 mm.
Claim 25
Dependent Claim
19 words
A wound dressing according to claim 1 wherein the liquid impervious moisture vapor permeable material is a polyurethane film.
Claim 26
Dependent Claim
30 words
A method of treating a wound which comprises applying to the wound a wound dressing according to claim 1 until the wound has healed sufficiently to remove the wound dressing.
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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) | 1998-04-24 | 1998-10-24 | 1999-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-24 | 2002-10-24 | 2003-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-24 | 2006-10-24 | 2007-04-25 | $7700.00 | Window Closed / Lapsed |