Patent ID: 7922703

Claim:
Drainage device for the treatment of wounds using reduced pressure, comprising: (a) a gas-tight wound-covering element, which comprises a sheet-like material and, in the state placed in contact with the body of the patient, is fastened adhesively to the surface of the skin around the region of the wound and forms a sealed wound space between the respective wound and the wound-covering element, (b) at least one means for producing a reduced pressure, connected to a drainage tube, which can be inserted into the wound space approximately parallel to the wound-covering element, by means of which material in the wound space can be evacuated, and (c) at least one absorption body, which is disposed in the wound space and absorbs the wound secretions, wherein the absorption body has at least one layer, which is enclosed in an envelope, of a textile section interspersed with super-absorbing particles, the envelope being permeable to liquids and having pores, the size of which essentially does not exceed that of the super-absorbing particles, the absorption body, which is to be inserted in the wound space, has an initial volume (V 1 ), which increases in the course of the absorption process and assumes a final volume (V 2 ), so that, due to the pore size of the envelope, the absorbed wound secretions remain within the absorption body and, with that, underneath the wound-covering element until the absorption body is removed from the wound space, and the wound-covering element has a window-like treatment opening, through which the absorption body can be placed into and removed out of the wound space, and a gas-tight lid configured to close off the treatment opening, and at least one air opening, with which the reduced pressure within the wound space can be regulated, disposed in the lid.