Wound dressing system for introduction into a wound, comprising at least one planar capillary membrane system, characterized in that the at least one planar capillary membrane system is arranged in a pouch-shaped wound dressing which is closed at its outer edge and which has an upper face, a lower face and a interior of the pouch, wherein the lower face and the upper face are each formed from a planar material, and the lower face is permeable to fluids, wherein the at least one planar capillary membrane system is arranged in the interior of the pouch and is connected to at least one supply line, such that liquids, media, gases and/or other substances can be conveyed through the supply line and the at least one capillary membrane system, and wherein the at least one supply line is connectable, outside the pouch-shaped wound dressing, to a unit for supply or disposal.