Medical dressing comprising a backing layer with three dimensional features
Described is a medical dressing having a backing layer containing three dimensional features. The dressing is flexible and has an improved wear time. Also described is a method for preparing such a medical dressing.
1 . A medical dressing comprising:
an adhesive skin contact layer;
a backing layer; and
an absorbent pad having a skin-facing surface and an outwardly facing surface opposite the skin-facing surface, wherein the absorbent pad is arranged between said backing layer and said adhesive skin contact layer so that the skin-facing surface faces the adhesive skin contact layer and the outwardly facing surface faces the backing layer,
wherein said backing layer has a first surface facing said adhesive skin contact layer and an opposing second surface, characterized in that said backing layer comprises a plurality of three dimensional features forming protrusions on said second surface of said backing layer and depressions on said first surface of said backing layer,
wherein said depressions of said backing layer define gaps between an immediately adjacent underlying layer that is one of said adhesive skin contact layer or said absorbent pad, wherein a first area of the backing layer overlies an entirety of the absorbent pad, and wherein the backing layer is a continuous and uninterrupted surface across an entirety of the first area.
2 . The medical dressing according to claim 1 , wherein each three dimensional feature comprises a top portion, and at least one slope portion, wherein, for each three dimensional feature, a thickness of the backing layer in said top portion of each three dimensional feature is greater than in said at least one slope portion of said three dimensional feature.
3 . The medical dressing according to claim 2 , wherein, for each three dimensional feature, each slope portion of said at least one slope portion is at least 10% thinner than said top portion of each three dimensional feature.
4 . The medical dressing according to claim 3 , wherein said absorbent pad comprises a plurality of cuts extending at least partly through said absorbent pad.
5 . The medical dressing according to claim 1 , wherein said three dimensional features are arranged in a discrete or continuous pattern across at least a portion of said backing layer.
6 . The medical dressing according to claim 5 , wherein said pattern of three dimensional features extends over at least 30% of the surface area of said backing layer.
7 . The medical dressing according to claim 1 , wherein said adhesive skin contact layer is substantially planar.
8 . The medical dressing according to claim 1 , wherein said backing layer and said adhesive skin contact layer extend around the periphery of said absorbent pad, wherein said first surface of said backing layer is not adhesively attached to said absorbent pad in the areas forming said depressions.
9 . The medical dressing according to claim 1 , wherein said dressing has a longitudinal (y) direction and a lateral (x) direction, and wherein said three dimensional features are arranged to extend in at least one of said longitudinal (y) and said lateral (x) directions.
10 . The medical dressing according to claim 1 , wherein said three dimensional features have a height of between 0.3 and 10 mm.
11 . The medical dressing according to claim 1 , wherein said backing layer has a non-uniform thickness.
12 . The medical dressing according to claim 1 , wherein the absorbent pad as a periphery, wherein the backing layer extends beyond the periphery of the absorbent pad to define a border portion, wherein the plurality of the three dimensional features overlie the absorbent pad and the border portion.
13 . The medical dressing according to claim 1 , wherein the absorbent pad has a periphery, wherein the backing layer extends beyond the periphery of the absorbent pad to define a border portion, wherein the adhesive skin contact layer extends beyond the periphery of the absorbent pad and contacts the backing layer within the border portion.
14 . A medical dressing comprising:
an adhesive skin contact layer;
a backing layer, wherein said backing layer has a first surface facing said adhesive skin contact layer and an opposing second surface, characterized in that said backing layer comprises a plurality of three dimensional features forming protrusions on said second surface of said backing layer and depressions on said first surface of said backing layer; and
an absorbent pad having a skin-facing surface and an outwardly facing surface opposite the skin-facing surface, wherein the absorbent pad is arranged between said backing layer and said adhesive skin contact layer so that the skin-facing surface faces the adhesive skin contact layer and the outwardly facing surface faces the backing layer,
wherein said first surface of said backing layer is not attached to either of said adhesive skin contact layer or said absorbent pad in areas forming said depressions, wherein a first area of the backing layer overlies an entirety of the absorbent pad, and wherein the backing layer is a continuous and uninterrupted surface across an entirety of the first area.
15 . The medical dressing according to claim 14 , wherein said depressions of said backing layer provide gaps between an underlying one of said adhesive skin contact layer or said absorbent pad.