Wound dressing
Wound dressings displaying improved adhesion and breathability and methods for their manufacture, the wound dressing comprising a backing layer, a layer of pressure-sensitive adhesive and a perforated layer of silicone gel, wherein the layer of pressure-sensitive adhesive is disposed between the substrate and the perforated layer of silicone gel, and wherein the layer of pressure-sensitive adhesive is moisture-permeable.
1 . A wound dressing comprising a backing layer, a layer of pressure-sensitive adhesive and a perforated layer of silicone gel, wherein the layer of pressure-sensitive adhesive is disposed between the backing layer and the perforated layer of silicone gel, wherein the layer of pressure-sensitive adhesive is moisture-permeable, and wherein:
the layer of pressure-sensitive adhesive comprises apertures that are irregularly shaped and/or sized; and
the layer of pressure-sensitive adhesive is formed from intermingling fibres of adhesive that form an irregular mat or mesh on the backing layer.
2 . The wound dressing of claim 1 , wherein the pressure-sensitive adhesive is rubber/resin adhesive, acrylic adhesive or acrylate adhesive.
3 . The wound dressing of claim 1 , wherein the layer of pressure-sensitive adhesive is applied to, and extends across a whole surface of, the backing layer.
4 . The wound dressing of claim 1 , wherein the layer of pressure-sensitive adhesive is a discontinuous layer of pressure-sensitive adhesive.
5 . The wound dressing of claim 1 , wherein the layer of pressure-sensitive adhesive comprises apertures having a mean average area of from 0.1 mm 2 to 5 mm 2 , or from 0.1 mm 2 to 4 mm 2 , or from 0.1 mm 2 to 3 mm 2 .
6 . The wound dressing of claim 5 , wherein the apertures in the layer of pressure-sensitive adhesive account for at least 1%, at least 3%, at least 5%, at least 10%, at least 20%, or at least 30%, of the area covered by the pressure-sensitive adhesive and up to 80%, or up to 70%, or up to 60%, or up to 50%, or up to 40% of the area covered by the pressure-sensitive adhesive.
7 . The wound dressing of claim 1 , wherein the backing layer is a film of polyurethane, polyvinylchloride, polypropylene and regenerated cellulose.
8 . The wound dressing of claim 1 , wherein the perforated layer of silicone gel overlays the layer of pressure-sensitive adhesive and extends across a whole wound contacting surface of the wound dressing, forming a wound contacting layer.
9 . The wound dressing of claim 1 , wherein a coating weight of the silicone gel layer is less than 600 g/m 2 , less than 400 g/m 2 , less than 300 g/m 2 or about 200 g/m 2 .
10 . The wound dressing of claim 1 , wherein the perforations in the layer of silicone gel have a diameter of between 1 mm and 15 mm, between 3 mm and 10 mm, between 5 mm and 8 mm, or about 6 mm.
11 . The wound dressing of claim 1 , wherein the silicone gel layer is carried on a substrate layer.
12 . The wound dressing of claim 11 , wherein the substrate layer is melt-blown polyurethane.
13 . The wound dressing of claim 1 , wherein the apertures of the layer of pressure-sensitive adhesive are irregularly shaped.
14 . A method for production of a wound dressing, said method comprising:
a) providing a backing layer;
b) applying a discontinuous layer of pressure-sensitive adhesive to the backing layer by fiberization, to form a moisture-permeable layer of pressure-sensitive adhesive, which layer comprises apertures that are irregularly shaped and/or sized and is in the form of intermingling fibres of adhesive that form an irregular mat or mesh on the backing layer; and
c) applying a perforated layer of silicone gel to the layer of pressure-sensitive adhesive.
15 . The method of claim 14 , wherein fiberization comprises extruding the adhesive into a stream of heated air and depositing the adhesive onto the substrate.
16 . The method of claim 14 , wherein the layer of pressure-sensitive adhesive comprises apertures having a mean average area of from 0.1 mm 2 to 5 mm 2 , or from 0.1 mm 2 to 4 mm 2 , or from 0.1 mm 2 to 3 mm 2 .
17 . The method of claim 14 , wherein the apertures in the layer of pressure-sensitive adhesive account for at least 1%, at least 3%, at least 5%, at least 10%, at least 20%, or at least 30%, of the area covered by the pressure-sensitive adhesive and up to 80%, or up to 70%, or up to 60%, or up to 50%, or up to 40% of the area covered by the pressure-sensitive adhesive.
18 . The method of claim 14 , wherein the backing layer is a film of polyurethane, polyvinylchloride, polypropylene and regenerated cellulose.
19 . The method of claim 14 , wherein a coating weight of the silicone gel layer is less than 600 g/m 2 , less than 400 g/m 2 , less than 300 g/m 2 or about 200 g/m 2 .
20 . The method of claim 14 , wherein the perforations in the layer of silicone gel have a diameter of between 1 mm and 15 mm, between 3 mm and 10 mm, between 5 mm and 8 mm, or about 6 mm.
21 . The method of claim 14 , wherein the perforated silicone gel layer is carried on a substrate layer and is adhered to the backing layer via the substrate.
22 . The method of claim 21 , wherein the substrate layer is melt-blown polyurethane.
23 . The method of claim 14 , wherein the apertures of the layer of pressure-sensitive adhesive are irregularly shaped.