MULTI-LAYER ABSORBENT WOUND DRESSING WITH A HYDROPHILIC WOUND CONTACT LAYER

• US 20090216168A1
• Filed: 05/07/2009
• Published: 08/27/2009
• Est. Priority Date: 11/07/2006
• Status: Abandoned Application

• Current Assignee: Paul Hartmann AG (SCHWENK Zement GmbH & Co. KG)
• Original Assignee: Paul Hartmann AG (SCHWENK Zement GmbH & Co. KG)
• Inventors: Eckstein, Axel
• Application Number:
  US12/437,266
• Publication Number:
  US 20090216168A1
• Time in Patent Office: Days
• US Class Current: 602/43
• CPC Class Codes: A61F 13/00063 comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic drug delivery dressings A61K9/70; chemical aspect of the additives A61L15/00
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• CPC Class Codes: A61F 13/0253 characterized by the adhesive material
• CPC Class Codes: A61F 2013/00119 elastic
• CPC Class Codes: A61F 2013/00263 vapour permeability >500 g/m2/24h
• CPC Class Codes: A61F 2013/00659 polymeric base
• CPC Class Codes: A61F 2013/00697 elastomer-, e.g. rubber- based
• CPC Class Codes: A61F 2013/0074 containing foams
• CPC Class Codes: A61F 2013/00744 containing non-woven
• CPC Class Codes: A61F 2013/00748 with hydrocolloids or superabsorbers
• CPC Class Codes: A61F 2013/00876 vapour permeability >500 g/mg/24h
• CPC Class Codes: A61F 2013/0091 with disinfecting or anaesthetics means, e.g. anti-mycrobic
• 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 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: C08L 75/04 Polyurethanes

Abstract

The present invention relates to wound dressings, particularly for the treatment of medium to severely exudative wounds, and their use in modern wound treatment. As multi-layer wound dressings, these wound dressings contain a carrier layer, an absorbing layer, and a hydrophilic wound contact layer connected to the absorbing layer, wherein the wound contact layer comprises a hydrophilic polyurethane elastomer.

Claims

1. A multi-layer wound dressing comprising a carrier layer, an absorbent layer and a hydrophilic wound contact layer, wherein the wound contact layer is connected to the absorbent layer and comprises a polyurethane elastomer.

2. The wound dressing of claim 1, wherein the absorbent layer is integrally connected to the wound contact layer.

3. The wound dressing of claim 1, wherein the elastomer is an adhesive polyurethane elastomer or a polyurethane elastomer adhesive.

4. The wound dressing of claim 1, wherein the polyurethane elastomer is a polyurethane adhesive which comprises less than about 4% by weight water.

5. The wound dressing of claim 1, wherein the wound contact layer is a polyurethane elastomer which is obtainable by polymerization of at least one aliphatic or cycloaliphatic isocyanate component with a polyether polyol component.

6. The wound dressing of claim 1 wherein the wound contact layer is a polyurethane elastomer, preferably a polyurethane elastomer adhesive, wherein the elastomer is obtained by polymerization of isophorone diisocyanate or a modified isophorone diisocyanate with at least one diol or polyol component.

7. The wound dressing of claim 6 wherein the at least one diol or polyol component has 2, 3, 4, 5, or 6 hydroxyl groups.

8. The wound dressing of claim 6 wherein the at least one polyether polyol has OH numbers of about 20 to about 112.

9. The wound dressing of claim 6 wherein the at least one polyether polyol has an EO content of greater than about 10% by weight.

10. The wound dressing of claim 6 wherein the at least one polyether polyol has an EO content of about 10% to about 40% by weight.

11. The wound dressing of claim 6 wherein the at least one polyether polyol has an EO content of about 10% to about 20% by weight.

12. The wound dressing of claim 1 wherein the wound contact layer has an adhesive strength of about 0.02 to about 5 N/25 mm.

13. The wound dressing of claim 1, wherein the wound contact layer is a discontinuous wound contact layer.

14. The wound dressing of claim 1, wherein the absorbent layer a hydrophilic polymer film, an absorbent pad or nonwoven, a polymer matrix comprising at least one hydrocolloid, a freeze-dried foam, or combinations thereof.

15. The wound dressing of claim 1, wherein the absorbent layer comprises a hydrophilic polyurethane foam.

16. The wound dressing of claim 1 having a maximal fluid uptake capacity of at least about 5000 g/m²/24 h.

17. The wound dressing of claim 1, wherein the carrier layer comprises a polyurethane foam or polyurethane film.

18. The wound dressing of claim 1, wherein the carrier layer and the absorbent layer together comprise a laminate of two different polyurethane foams.

19. The wound dressing of claim 1, wherein the absorbent layer has a higher free absorption than the wound contact layer.

20. The wound dressing of claim 1, wherein the hydrophilic wound contact layer further comprises at least one antimicrobial agent.

21. The wound dressing of claim 1, wherein the wound dressing further comprises at least one distribution layer.

22. A method of treating a chronic wound comprising contacting the wound with a hydrophilic wound contact layer comprising a hydrophilic polyurethane elastomer.

23. The method of claim 22 wherein treating further comprises actively or passively supporting tissue buildup in the wound.