Patent ID: 8362316

Claim:
A wound dressing comprising at least three layers including a first layer, a second layer and a third layer in order from a side used in contact with a wound site, the layers being integrally stacked together, the first layer comprising a resin sheet material having a plurality of pores penetrating in a thickness direction, wherein the thickness of the resin sheet material is 100 to 2000 μm, wherein an opening of each pore on a surface used in contact with a wound site is 280 to 1400 μm in equivalent diameter, wherein an opening of each pore on an opposite surface of the first layer is smaller than that on the surface used in contact with a wound site, wherein the density of said pores is 50 to 400/cm 2 , wherein said surface used in contact with a wound site is hydrophobic, wherein said first layer has an initial water pressure resistance, and wherein the resin sheet material substantially does not allow water to permeate through any part other than said pores, the second layer comprising a sheet material having a water-repellent surface, said second layer has an initial water pressure resistance higher than that of the first layer, and the third layer comprising a sheet material capable of absorbing and holding water.