WOUND DRESSING WITH HIGH LIQUID HANDLING CAPACITY

• US 20120095380A1
• Filed: 05/11/2010
• Published: 04/19/2012
• Est. Priority Date: 06/15/2009
• Status: Active Grant

• Current Assignee: Molnlycke Health Care AB (Mölnlycke Holding AB)
• Original Assignee: Molnlycke Health Care AB (Mölnlycke Holding AB)
• Inventors: Netsner, Bengt, Dahlberg, Anders, Daun, Eva-Karin, Gergely, Ann-Britt
• Granted Patent: US 8,513,481 B2
• Time in Patent Office: Days
• US Class Current: 602/45
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• CPC Class Codes: A61F 13/0226 characterised by the support layer
• CPC Class Codes: A61F 13/025 having a special distribution arrangement of the adhesive
• CPC Class Codes: A61F 13/0253 characterized by the adhesive material
• CPC Class Codes: A61F 13/53708 the layer having a promotional function on liquid propagation in at least one direction
• CPC Class Codes: A61F 13/53713 the layer having a promotional function on liquid propagation in the vertical direction
• CPC Class Codes: A61F 13/53717 the layer having a promotional function on liquid propagation in the horizontal direction
• CPC Class Codes: A61F 13/53743 characterised by the position of the layer relative to the other layers
• CPC Class Codes: A61F 13/53747 the layer is facing the topsheet layer is part of the topsheet A61F13/511
• CPC Class Codes: A61F 13/53756 the layer facing the back-sheet
• 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 2013/0074 containing foams
• CPC Class Codes: A61F 2013/00744 containing non-woven
• CPC Class Codes: A61F 2013/00748 with hydrocolloids or superabsorbers wound bandages with alginate A61F2013/00229; plasters with cyano-acrylic adhesive A61F2013/00459; plasters for treating burn with hydrogel A61F2013/00523; adhesive for plasters, with hydrogel A61F2013/00676; water-based A61F2013/00689; for use on mucosae A61F2013/00714; for use on wounds A61F2013/00719; with absorbent adhesives A61F2013/00757; with fumed silica A61F2013/00787; with viscoelastic oil-elastomer gel A61F2013/00893
• CPC Class Codes: A61F 2013/00761 with permeable adhesive layers
• CPC Class Codes: A61F 2013/00782 with macroscopic openings
• CPC Class Codes: A61F 2013/00855 pervious to air or vapours wound bandages in a special way pervious to air or vapour A61F2013/00246
• CPC Class Codes: A61F 2013/00876 vapour permeability >500 g/mg/24h
• CPC Class Codes: A61F 2013/53051 being only in particular parts or specially arranged
• CPC Class Codes: A61F 2013/530897 having capillary means, e.g. pore or fibre size gradient
• CPC Class Codes: A61F 2013/530905 : being hydrophilic
• CPC Class Codes: A61F 2013/53721 : with capillary means

Abstract

A wound dressing with a wound pad and a layer of vapour-permeable material arranged on top of the wound pad and extending peripherally outside the wound pad is described, wherein at least that part of the vapour-permeable layer extending peripherally outside the wound pad is coated with adhesive, and wherein the wound pad includes a liquid-retaining and liquid-transporting layer, and an upper distributing layer and lower distributing layer which bear against the top and underside, respectively, of the liquid-retaining and liquid-transporting layer.

Claims

1. A wound dressing comprising a wound pad and a layer of vapour-permeable material arranged on top of the wound pad and extending peripherally outside the wound pad, wherein at least that part of the vapour-permeable layer extending peripherally outside the wound pad is coated with an adhesive, and wherein the wound pad includes a liquid-retaining and liquid-transporting layer, and an upper distributing layer and lower distributing layer which bear against the top and underside, respectively, of the liquid-retaining and liquid-transporting layer.

2. The wound dressing of claim 1, wherein the wound pad comprises a liquid-transporting first layer, which is arranged under the lower of the distributing layers and bears thereon.

3. The wound dressing of claim 1, wherein the layers of the wound pad are connected adhesively or mechanically to one another, and the layer of vapour-permeable material is connected adhesively to the wound pad.

4. The wound dressing of claim 1, wherein the layers of the wound pad are connected to one another with the aid of heat and pressure or with the aid of ultrasound.

5. The wound dressing of claim 1, wherein the liquid-retaining and liquid-transporting layer comprises one or more plies comprising a mixture of hydrophilic or hydrophilized absorbent fibres and superabsorbents in powder form, fibre form or other form.

6. The wound dressing of claim 5, wherein binding fibres are mixed into the liquid-retaining and liquid-transporting layer.

7. The wound dressing of claim 5, wherein the liquid-retaining and liquid-transporting layer has capillaries of different sizes, wherein the capillaries in contact with the upper distributing layer are smaller than the capillaries in other areas of the liquid-retaining and liquid-transporting layer.

8. The wound dressing of claim 5, wherein the proportion of superabsorbents in the mixture of absorbent fibres and superabsorbents is greater in an upper part of the liquid-transporting and liquid-retaining layer than in a lower part thereof.

9. The wound dressing of claim 5, wherein one of the distributing layers or both of the distributing layers is or are integrated in the liquid-retaining and liquid-transporting layer.

10. The wound dressing of claim 1, wherein the liquid-retaining and liquid-transporting layer comprises polymer foam with or without admixture of superabsorbents.

11. The wound dressing of claim 2, wherein the liquid-transporting first layer comprises a polymer foam.

12. The wound dressing of claim 1, wherein at least one of the distributing layers comprises a tissue, a hydrophilic nonwoven material or polymer foam.

13. The wound dressing of claim 1, wherein the vapour-permeable layer comprises a polymer film that has a vapour permeability greater than 2000 g/m² per 24 hours, measured according to ASTM D 6701.

14. The wound dressing of claim 1, wherein the wound pad is coated on its underside with a liquid-permeable layer of adhesive.

15. The wound dressing of claim 14, wherein the adhesive coating comprises a silicone adhesive placed on a perforated support, which in turn is secured to the underside of the wound pad and to the vapour-permeable film in the part thereof extending peripherally outside the wound pad.