IP Library Granted Patent US 10,543,133
Granted Patent B2
US 10,543,133 · App. 13/509,161 · Granted Jan 28, 2020

Component for a wound dressing

Inventors: Helen Louise Shaw (Deeside, GB); David Colin Pritchard (Deeside, GB); Bryony Jayne Lee (Deeside, GB); Stephen Mark Bishop (Deeside, GB)
Assignee: ConvaTec Technologies Inc.
A61F13/539
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Quick Facts
Patent No.
US 10,543,133
App. No.
13/509,161
Granted
Jan 28, 2020
Kind
B2
Abstract

An absorbent component for a wound dressing, the component comprising a wound contacting layer comprising gel forming fibres bound to a foam layer.

Claims (15)

1. An absorbent component for a wound dressing, the component comprising a wound contacting layer comprising gel forming fibres consisting essentially of carboxymethylcellulose fibres, cellulose ethyl sulphonate, pectin fibres, alginate fibres, composite fibres of alginate and polysaccharide, chitosan fibres, polysaccharide fibres, fibres derived from gums or a mixture thereof, bound to a foam layer comprising an absorbency of 10-20 g/g when measured by the free swell absorbency method, wherein the foam layer is bound directly to the wound contacting layer by adhesive, polymer based melt layer, flame lamination or ultrasound, wherein the wound contacting layer is configured to absorb exudate by gelling and provides containment of lateral spread of the exudate and the foam layer is configured to absorb exudate but readily releases it through moisture vapour transmission.

2. The absorbent component for a wound dressing as claimed in claim 1 , wherein the absorbent component is in sheet form.

3. The absorbent component for a wound dressing as claimed in claim 1 , wherein the gel forming fibres are woven, non-woven and/or knitted.

4. The absorbent component for a wound dressing as claimed in claim 1 , wherein the foam layer is an open cell foam.

5. The absorbent component for a wound dressing as claimed in claim 1 , wherein the foam layer is a hydrophilic foam.

6. The absorbent component for a wound dressing as claimed in claim 1 , wherein the foam layer comprises a thickness of 0.25 mm to 5 mm.

7. An absorbent component for a wound dressing, the component comprising a wound contacting layer comprising gel forming fibres consisting essentially of carboxymethylcellulose fibres, cellulose ethyl sulphonate, pectin fibres, alginate fibres, composite fibres of alginate and polysaccharide, chitosan fibres, polysaccharide fibres, fibres derived from gums or a mixture thereof, bound to a foam layer comprising a thickness of 0.25 mm to 5 mm, wherein the foam layer is bound directly to the wound contacting layer by adhesive, polymer based melt layer, flame lamination or ultrasound, wherein the wound contacting layer is configured to absorb exudate by gelling and provide containment of lateral spread of the exudate and the foam layer is configured to absorb exudate but readily releases it through moisture vapour transmission.

8. The absorbent component for a wound dressing as claimed in claim 7 , wherein the absorbent component is in sheet form.

9. The absorbent component for a wound dressing as claimed in claim 7 , wherein the gel forming fibres are woven, non-woven and/or knitted.

10. The absorbent component for a wound dressing as claimed in claim 7 , wherein the foam layer is an open cell foam.

11. The absorbent component for a wound dressing as claimed in claim 7 , wherein the foam layer is a hydrophilic foam.

12. A wound dressing comprising an absorbent component having a wound contacting layer with gel forming fibres consisting essentially of carboxymethylcellulose fibres, cellulose ethyl sulphonate, pectin fibres, alginate fibres, composite fibres of alginate and polysaccharide, chitosan fibres, polysaccharide fibres, fibres derived from gums or a mixture thereof, bound to a foam layer comprising a thickness of 0.25 mm to 5 mm, wherein the foam layer is bound directly to the wound contacting layer by a first adhesive, polymer based melt layer, flame lamination or ultrasound, wherein the wound contacting layer is configured to absorb exudate by gelling and provide containment of lateral spread of the exudate and the foam layer is configured to absorb exudate but readily releases it through moisture vapour transmission; and a second adhesive for holding the absorbent component in contact with the wound.

13. The wound dressing as claimed in claim 12 , wherein the absorbent component is capable of forming an island in direct contact with the wound surrounded by a periphery of the second adhesive.

14. The wound dressing as claimed in claim 12 , wherein the second adhesive is a silicone adhesive.

15. The wound dressing as claimed in claim 12 , wherein the dressing is covered by a film layer on a surface of the dressing furthest from the wound.

Assignments (3)
RELEASE OF SECURITY INTEREST Recorded Oct 25, 2019
From: WILMINGTON TRUST (LONDON) LIMITED
To: CONVATEC TECHNOLOGIES INC.
Reel/Frame 050831/0001 →
SECURITY AGREEMENT Recorded Nov 3, 2016
From: CONVATEC INC.; CONVATEC TECHNOLOGIES INC.; 180 MEDICAL, INC.; PRN MEDICAL SERVICES, LLC
To: WILMINGTON TRUST (LONDON) LIMITED, AS COLLATERAL AGENT
Reel/Frame 040552/0227 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 18, 2012
From: SHAW, HELEN; PRITCHARD, DAVID; LEE, BRYONY JANE; BISHOP, STEPHEN M.
To: CONVATEC TECHNOLOGIES, INC.
Reel/Frame 028574/0124 →