Wound dressing, manufacture and use

• US 4,995,382 A
• Filed: 04/28/1989
• Issued: 02/26/1991
• Est. Priority Date: 02/13/1981
• Status: Expired due to Term

• Current Assignee: Smith and Nephew Associated Companies PLC
• Original Assignee: Smith and Nephew Associated Companies PLC
• Inventors: Lang, Stephen M., Webster, David F.
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): Rafa, Michael
• Application Number:
  US07/345,099
• Time in Patent Office: 669 Days
• Field of Search: 128/155, 128/156, 604/366, 604/369, 604/370, 604/375
• US Class Current: 602/55
• CPC Class Codes: A61F 13/023 wound covering film layers without a fluid retention layer
• CPC Class Codes: A61F 13/0243 characterised by the properties of the skin contacting layer, e.g. air-vapor permeability
• CPC Class Codes: A61F 13/51121 characterised by the material
• CPC Class Codes: A61F 13/512 characterised by its apertures, e.g. perforations
• CPC Class Codes: A61F 13/534 having an inhomogeneous composition through the thickness of the pad A61F13/538, A61F13/539 take precedence; homogeneous cores with tissue wrapping A61F13/53
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers
• CPC Class Codes: A61F 13/8405 Additives, e.g. for odour, disinfectant or pH control
• CPC Class Codes: A61F 2013/00119 elastic
• CPC Class Codes: A61F 2013/00157 for burns or skin transplants A61F2013/00187 takes precedence; not adhering to the wound A61F2013/00217
• CPC Class Codes: A61F 2013/00217 not adhering to the wound with wax A61F2013/00161
• CPC Class Codes: A61F 2013/00519 for treating burn bandages for burns or skin transplants A61F2013/00157
• CPC Class Codes: A61F 2013/00697 elastomer-, e.g. rubber- based
• CPC Class Codes: A61F 2013/0074 containing foams
• CPC Class Codes: A61F 2013/00782 with macroscopic openings
• CPC Class Codes: A61F 2013/15821 characterized by the apparatus for manufacturing
• CPC Class Codes: A61F 2013/530802 characterized by the foam or sponge other than superabsorbent A61F2013/530649 takes precedence
• CPC Class Codes: A61F 2013/53445 from several sheets
• CPC Class Codes: A61F 2013/5395 with thermoplastic agent, i.e. softened by heat
• CPC Class Codes: A61L 15/24 Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: A61L 15/26 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: A61L 15/42 : Use of materials characterised by their function or physical properties liquid bandages A61L26/00
• CPC Class Codes: A61L 15/425 : Porous materials, e.g. foams or sponges
• CPC Class Codes: A61L 15/58 : Adhesives
• CPC Class Codes: C08L 33/04 : Homopolymers or copolymers of esters C08L43/04 takes precedence
• CPC Class Codes: C08L 75/04 : Polyurethanes

Abstract

A wound dressing which comprises an absorbent layer comprising an open cell foam of a hydrophilic polymer and a wound facing layer comprising either a conformable net of elastomer coated with adhesive on its wound facing surface or an adhesive layer, pattern spread in a conformable net-like configuration, the dressing optionally also having a conformable moisture vapour transmitting outer layer; and a process for making said dressing.

Claims

1. A wound dressing which consists essentially of a low adherency wound facing layer, an absorbent layer and an outer layer, wherein said low adherency wound facing layer has a wound contacting, first adhesive coating over its wound facing surface, said low adherency wound facing layer comprises a conformable apertured film, a conformable net of elastomer or an adhesive layer pattern spread in a conformable net-like configuration, the absorbent layer comprises a conformable hydrophilic foam and the outer layer is a continuous or discontinuous moisture vapour transmitting conformable backing layer which has a layer of a second adhesive on one surface thereof, at least one of said backing layer and said second adhesive layer being continuous to provide a barrier to bacteria and to liquid water.

2. A wound dressing according to claim 1 wherein the absorbent layer comprises an open cell foam of a hydrophilic polymer.

3. A wound dressing according to claim 2 wherein the hydrophilic polymer is a hydrophilic polyurethane.

4. A wound dressing according to claim 1 wherein the wound facing layer comprises a conformable net of elastomer.

5. A wound dressing according to claim 1 wherein the wound facing layer comprises an adhesive layer, pattern spread in a conformable net-like configuration onto the absorbent layer.

6. A wound dressing according to claim 1 wherein the first adhesive is an acrylate ester copolymer pressure sensitive adhesive or a polyvinyl ethyl ether pressure sensitive adhesive.

7. A wound dressing according to claim 6 wherein the first adhesive is an acrylate ester polymer pressure sensitive adhesive or a polyvinyl ethyl ether pressure sensitive adhesive, and has a thickness of 25 to 50 microns.

8. A wound dressing according to claim 1 wherein the outer layer comprises a conformable moisture vapour transmitting layer, the intermediate absorbent layer comprises an open cell foam of hydrophilic polymer and the wound facing layer comprises an adhesive layer, pattern spread in a conformable net-like configuration onto the absorbent layer.

9. A wound dressing according to claim 1 wherein the outer layer is a continuous conformable film.

10. A wound dressing which consists essentially of a low adherency wound facing layer, and an absorbent layer said low adherency wound facing layer having a wound contacting first adhesive coating over its wound facing surface, wherein said low adherency wound facing layer comprises a conformable aperture film, a conformable net of elastomer or an adhesive layer pattern spread in a conformable net-like configuration, and the absorbent layer comprises a conformable hydrophilic foam.