Wound dressing

A multilayered wound dressing comprising

• a) a first layer as a wound contact layer having a first side and a second side, and a plurality of channels extending from the first side to the second side, and including a hydrogel matrix which comprises a polyurethane-polvurea copolymer formed from a prepolymer having aliphatic diisocyanate groups and a polyamine based on polyethylene oxide, and wherein the hydrogel matrix contains from 20% to 80% of wound deliverable water;
• b) at least one second layer as an absorbent layer having a planar first side and a second side and comprising a hydrophilic polyurethane foam, the first side being in contact with the wound contact first layer and, which has a water fraction of at least 10% by weight and at most 80% by weight of water, a free absorbency A2 of at least 10 g/g determined by DIN-EN13726-1 and a swell capacity ΔV1 of at most 60%;
• c) a transition layer disposed between the first layer and the second layer and which transition layer consists of a portion of the hydrogel matrix of the first layer which has penetrated into a portion of the polyurethane foam of the second layer, said transition layer having channels which are filled with only polyurethane foam from the second side of the second layer and which channels are disposed congruent relative to the channels in the hydrogel matrix of the first layer;
• and,
• d) a water impermeable and moisture vapor permeable polymer film or a water impermeable and moisture vapor permeable polymer foam as a backing layer bonded to the second side of the polyurethane foam by a discontinuous layer of adhesive.

A laminate dressing consisting essentially of:

• a) a first layer as a wound contact layer having a first side and a second side, and a multiplicity of channels, and including a hydrogel matrix which comprises a polyurethane-polyurea copolymer formed from a prepolymer having aliphatic diisocyanate groups and a polyamine based on polyethylene oxide, and wherein the hydrogel matrix contains from 20% to 80% of wound deliverable water;
• b) at least one second layer as an absorbent layer having a first side and a second side and comprising a hydrophilic polyurethane foam which has a water fraction of at least 10% by weight and at most 80% by weight of water, a free absorbency A2 of at least 10 g/g determined by DIN-EN13726-1 and a swell capacity ΔV1 of at most 60%;
• and,
• c) a transition layer disposed between the first layer and the second layer and which transition layer consists of a portion of the hydrogel matrix of the first layer which has penetrated into a portion of the polyurethane foam of the second layer, said transition layer having channels which are filled with only polyurethane foam from the second side of the second layer and which channels are disposed congruent relative to the channels in the hydrogel matrix of the first layer.