EP0147119A2
Expired / Lapsed
EP
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Surgical dressing
Assignee: Smith and Nephew PLC
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Filing: 1984-12-10
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Granted: —
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Expires: 2004-12-10
Abstract
Abstract An adhesive dressing for use on moist wounds which comprises a pressure sensitive adhesive-coated wound contacting first layer in which there are present holes capable of transmitting liquid water and a moisture vapour permeable, continuous film. The continuous film is attached to the first layer in such a way as to form a reservoir into which water can pass through the holes in the first layer and can evaporate from the reservoir through the continuous film. The adhesive coated first layer has a moisture vapour permeability of less than 300gm -2 24hr -1 at 37°C and 100% to 10% relative humidity difference and the continuous film has a moisture vapour permeability which is greater when in contact with liquid water than when not in contact with liquid water. Optionally, an intermediate water transmitting layer may be present between the first layer and the continuous film.
Inventors
- 👤 David Alan Rawlings
- 👤 William Duncan Potter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 16:13
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61F; A61F13/00; A61F13/02; A61F13/023; A61F13/0246; A61F13/0256; A61L15/22; A61L15/24; A61L15/26; A61F13/15; A61F13/53; A61F13/534; A61F13/537; A61F2013/00089; A61F2013/0017; A61F2013/00246; A61F2013/00263; A61F2013/00361; A61F2013/00727; A61F2013/00731; A61F2013/00744; A61F2013/00761; A61F2013/00782; A61F2013/00855; A61F2013/00876; A61F13/51; A61F13/511; A61F2013/51186; A61F13/513; A61F2013/51355; A61F2013/53445; A61F2013/53765; A61F2013/53782; A61F13/84; A61F2013/8476; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
1 . An adhesive dressing suitable for use on moist wounds which dressing comprises a pressure sensitive adhesive-coated first layer which has holes therethrough capable of transmitting liquid water and a moisture vapour permeable continuous film attached to the first layer thereby forming a reservoir into which water can pass and evaporate therefrom which dressing is characterised in that the adhesive coated first layer has an uninterrupted moisture vapour permeability of less than 300g m -2 24hr " 1 and the moisture vapour permeable continuous film has a moisture vapour permeability which is greater when in contact with liquid water than when not in contact with liquid water.
Claim 2
Dependent Claim
108 words
1 . An adhesive dressing suitable for use on moist wounds which dressing comprises a pressure sensitive adhesive-coated first layer which has holes therethrough capable of transmitting liquid water and a moisture vapour permeable continuous film attached to the first layer thereby forming a reservoir into which water can pass and evaporate therefrom which dressing is characterised in that the adhesive coated first layer has an uninterrupted moisture vapour permeability of less than 300g m -2 24hr " 1 and the moisture vapour permeable continuous film has a moisture vapour permeability which is greater when in contact with liquid water than when not in contact with liquid water.
Claim 3
Dependent Claim
126 words
An adhesive dressing suitable for use on moist wounds which dressing comprises a pressure sensitive adhesive coated first layer which has holes therethrough capable of transmitting liquid water and a moisture vapour permeable continuous film attached to the first layer thereby forming a reservoir into which water can pass and evaporate therefrom which dressing is characterised in that the adhesive coated first layer has an uninterrupted -2 -1 moisture vapour permeability of less than 300g m 24hr and the moisture vapour permeable continuous film has a moisture vapour permeability which is greater when in contact with liquid water than when not in contact with liquid water and in that there is a further water transmitting intermediate layer present between the first layer and the continuous film.
Claim 4
Dependent Claim
126 words
An adhesive dressing suitable for use on moist wounds which dressing comprises a pressure sensitive adhesive coated first layer which has holes therethrough capable of transmitting liquid water and a moisture vapour permeable continuous film attached to the first layer thereby forming a reservoir into which water can pass and evaporate therefrom which dressing is characterised in that the adhesive coated first layer has an uninterrupted -2 -1 moisture vapour permeability of less than 300g m 24hr and the moisture vapour permeable continuous film has a moisture vapour permeability which is greater when in contact with liquid water than when not in contact with liquid water and in that there is a further water transmitting intermediate layer present between the first layer and the continuous film.
Claim 5
Dependent Claim
31 words
A dressing as claimed in either of claims 1 or 2 in which the first layer has an uninterrupted moisture -2 -1 vapour permeability of less than 300g m 24hr .
Claim 6
Dependent Claim
37 words
A dressing as claimed in either of claims 1 or 2 in which the adhesive coated first layer if free from holes has a moisture vapour permeability of from 200 to 260g m -2 24hr -1 .
Claim 7
Dependent Claim
56 words
A dressing as claimed in any of claims 1 to 4 in which the continuous film has a moisture vapour permeability when not in contact with water of not more than 4800g m -2 24hr -1 and a moisture vapour permeability -2 when in contact with water of not less than 8000g m -1 24hr .
Claim 8
Dependent Claim
37 words
A dressing as claimed in any of claims 1 to 5 in which the continuous film is a hydrophilic polymer which when hydrated contains from 5 to 50% by weight water and is 15 to 80pm thick.
Claim 9
Dependent Claim
28 words
A dressing as claimed in claim 6 in which the hydrophilic polymer is a hydrophilic polyurethane which when hydrated contains from 10 to 40% by weight of water.
Claim 10
Dependent Claim
28 words
A dressing as claimed in any of claims 1 to 7 in which the first layer is a styrene-butadiene-styrene film and which is from 15 to 100pm thick.
Claim 11
Dependent Claim
49 words
A dressing as claimed in any of claims 1 to 8 in which the pressure sensitive adhesive coated on the first layer comprises a polyvinyl ethyl ether adhesive or an acrylate ester copolymer adhesive which is present at a weight per unit area of from 20 to 80 gsm.
Claim 12
Dependent Claim
26 words
A dressing as claimed in claim 2 in which the second water transmitting intermediate layer is a non-woven fabric and is from 15 to 100pm thick.
Claim 13
Dependent Claim
36 words
ll. A dressing as claimed in any of claims 1 to 10 in which the holes in the adhesive coated first layer are in the form of slits which are from 0.3 to 1.4cm in length.
Claim 14
Dependent Claim
28 words
A dressing as claimed in any of claims 1 to 11 in which the first layer extends beyond the edges of the continuous film on two opposed edges.
Claim 15
Dependent Claim
21 words
A dressing as claimed in any of claims 1 to 12 in a sterile form packaged in a bacteria proof pack.
References Cited (Backward Citations)
No citation records indexed.
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