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"Drainage system to be used with an open wound, an element which is used thereby for placing a drainage tube or hose, and a method of using said drainage system. The invention relates to a drainage system to be used with an open wound, which system consists of a block of a porous, moisture absorbing material, which is connected to a tube or hose, which is in turn connected to a suction unit, which porous material is covered with a foil, wherein an element consisting of a plate-shaped member is provided on the porous, moisture absorbing material, the plate-shaped member being provided on the upper side with a partially open thickening for placing or inserting the tube or hose, which thickening is provided on the underside with one or more openings, which open into and cooperate with openings in the plate shaped member. The invention furthermore relates to the element and to a method of using the drainage system. "