ABSORBENT WOUND DRESSINGS

• US 20160067107A1
• Filed: 04/08/2014
• Published: 03/10/2016
• Est. Priority Date: 04/08/2013
• Status: Abandoned Application

• Current Assignee: Brightwake Limited
• Original Assignee: Brightwake Limited
• Inventors: COTTON, Stephen
• Application Number:
  US14/783,385
• Publication Number:
  US 20160067107A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61F 13/01012 being made of natural material, e.g. cellulose-, protein-, collagen-based
• CPC Class Codes: A61F 13/01017 synthetic, e.g. polymer based
• CPC Class Codes: A61F 13/01029 made of multiple layers
• CPC Class Codes: A61F 13/01042 Absorbency
• CPC Class Codes: A61F 13/0209 comprising superabsorbent material
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• CPC Class Codes: A61F 13/0223 characterized by parametric properties of the fluid retention layer, e.g. absorbency, wicking capacity, liquid distribution
• CPC Class Codes: A61F 13/0253 characterized by the adhesive material
• 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 15/28 Polysaccharides or their derivatives A61L15/225 takes precedence
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 5/04 Alginic acid; Derivatives thereof

Abstract

An absorbent wound dressing (1) comprising a superabsorbent material (13) that is in fluid communication with the surface of a wound to which the dressing is applied when in use. The superabsorbent material (13) is enclosed in an envelope (14,15) having a wound-facing surface that is knitted or woven from a yarn comprising gelling fibres.

Claims

1. An absorbent wound dressing comprising a superabsorbent material that, in use, is in fluid communication with the surface of a wound to which the dressing is applied, wherein the superabsorbent material is enclosed in an envelope having a wound-facing surface knitted or woven from a yarn comprising gelling fibres.

2. A dressing according to claim 1, wherein the envelope is assembled from two sheets of material, with the superabsorbent material between them.

3. A dressing according to claim 2, wherein the non wound-facing surface is a polyester film or web.

4. A dressing according to claim 1, wherein the outward facing surface of the envelope is the outermost layer of the dressing.

5. A dressing according to claim 1, wherein the envelope is formed by welding.

6. A dressing according to claim 5, wherein the welding is heat welding.

7. A dressing according to claim 1, wherein the superabsorbent material is a polymeric superabsorbent material.

8. A dressing according to claim 7, wherein the superabsorbent material is sodium or calcium alginate.

9. A dressing according to claim 7, wherein the superabsorbent material is sodium polyacrylate polymer.

10. A dressing according to claim 1, wherein the superabsorbent material is in the form of particles.

11. A dressing according to claim 10, wherein the superabsorbent material particles are encapsulated between two layers of a carrier material.

12. A dressing according to claim 1, wherein the wound-facing surface is knitted.

13. A dressing according to claim 1, wherein the gelling fibre has an absorbency of at least 2 g/g.

14. A dressing according to claim 13, wherein the absorbency is at least 5 g/g, at least 10 g/g, at least 15 g/g, or at least 25 g/g.

15. A dressing according to claim 1, wherein the gelling fibres are pectin fibres, alginate fibres, fibres made from alginate and another polysaccharide, chitosan fibres, hyaluronic acid fibres, fibres of other polysaccharides or derived from gums, chemically-modified cellulosic fibres or a combination or blend of these fibres.

16. A dressing according to claim 15, wherein the gelling fibres are alginate fibres or pectin fibres.

17. A dressing according to claim 1, wherein the yarn comprises a blend of gelling fibres and non-gelling fibres.

18. A dressing according to claim 17, wherein the yarn comprises at least 50% w/w gelling fibres.

19. A dressing according to claim 17, wherein the non-gelling fibres are lyocell fibres.

20. A dressing according to claim 1, wherein the dressing comprises a backing layer that has a moisture vapour transmission rate of at least 300 g/m²/24 h at 37°

C.

21. A dressing according to claim 20, wherein the backing layer is a polyurethane film.

22. A dressing according to claim 1, wherein the backing layer is larger in size than the envelope.

23. A dressing according to claim 22, wherein the backing layer forms a border around the envelope.

24. A dressing according to claim 1, wherein at least part of the surface of the dressing that, in use, contacts a patient'"'"'s skin is provided with a skin contact adhesive.

25. A dressing according to claim 24, wherein the skin contact adhesive is a soft silicone adhesive.

26. A dressing according to claim 24, wherein the skin contact adhesive is provided only at the border of the dressing.

27. A dressing according to claim 24, wherein the skin contact adhesive is provided across the full extent of the dressing.

28. A dressing according to claim 1, wherein

the wound-facing surface of the envelope is knitted from yarn comprising a blend of gelling and non-gelling fibres;

the superabsorbent material is in the form of particles encapsulated between sheets of a carrier material;

the dressing comprises a backing layer that forms a border around the envelope; and

a soft silicone skin contact adhesive is provided on at least the border of the surface of the dressing that, in use, contacts a patient'"'"'s skin.

29-30. -30. (canceled)