US 4,753,231 AGranted

Adhesive wound dressing

AssigneeSmith and Nephew Associated Companies Limited

InventorsStephen M. Lang, David F. Webster

Life of this patent

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Abstract

Moisture vapor transmitting wound dressings are described which comprise (a) a conformable backing layer which has an adhesive on one of its surfaces and in which at least one of the backing layer and adhesive layer is continuous so as to provide a barrier both to bacteria and to liquid water when the dressing is in place on a wound and (b) a low wound adherency absorbent pad positioned on the adhesive side of the backing layer. The area of the pad is less than that of the backing layer so that an adhesive margin remains exposed on two, or preferably four, sides of the pad so that the backing layer may be adhered to the skin surrounding the wound area. The wound dressings have a moisture vapor transmission rate of from 500 to 2000 grams/square meter/24 hours at 37.5.degree. C. and 100% to 10% relative humidity difference. Materials for use in the dressings and processes for manufacture of the dressings are also described.

Claims12

Dependent claims

A conformable wound dressing which comprises:

(a) a low wound adherency wound facing layer 0.05 to 1 mm thick which is a conformable elastomer net;
(b) an absorbent layer in the form of a pad 0.5 to 20 mm thick of conformable open cell foam of a hydrophilic polymer;
and
(c) a moisture vapor permeable adhesive coated backing layer which serves to adhere the dressing to the wound area, at least one of said adhesive and said backing layer being continuous and said wound dressing having a moisture vapor transmission rate of from 300 to 5,000 grams/square meter/24 hours at 37.5.degree. C. at 100% to 10% relative humidity difference, said wound facing layer being laminated to one face of the absorbent layer and said backing layer being laminated to the opposing face of said absorbent layer, whereby the backing layer extends beyond the absorbent layer to act as a means of retaining the dressing whereby the wound dressing prevents ingress of bacteria and liquid water to the wound which is allowed to heal under moist conditions without causing the skin surrounding the wound to macerate.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/923,307Filed 27 Oct 1986 · continuation
Priority: GB 810456813 Feb 1981
Granted: 28 Jun 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification29 codes

A61L 15/58
Use of materials characterised by their function or physical properties: adhesives
A61F 13/023
Adhesive bandages or dressings: wound covering film layers without a fluid retention layer
A61F 13/0243
Wound covering film layers without a fluid retention layer: characterised by the properties of the skin contacting layer, e.g. air-vapor permeability
A61F 13/51121
Topsheet, i.e. the permeable cover or layer facing the skin: characterised by the material

Family

Serial345,550Parent of this continuation-in-part · filed 3 Feb 1982
Serial345,488Parent of this continuation-in-part · filed 3 Feb 1982
Serial396,754Parent of this continuation-in-part · filed 9 Jul 1982
Serial396,732Parent of this continuation-in-part · filed 9 Jul 1982
Serial506,501Parent of this continuation-in-part · filed 21 Jun 1983
Serial516,119Parent of this continuation · filed 20 Jul 1983
Serial794,753Parent of this continuation · filed 4 Nov 1985
US 4,753,231 AThis patent

From the US filing history. Foreign family members aren’t listed.