The dressing (10) has a flexible film (1) including a side for application on a wound bottom i.e. exposed inner organ or great omentum. The film is provided with openings (6) i.e. circular holes. Pockets (25) are opened towards a middle of the dressing and provided on a dressing side, which faces away from a wound during use. A conducting unit is not applied on another side of the film. The conducting unit is made of a bendable elastomer material with a thickness extension of maximum 30 mm and includes a continuous cavity. Liquid-permeable layers are provided on the dressing side. The liquid-permeable layers are designed as porous polymer foams. Independent claims are also included for the following: (1) a device for use during a low-pressure therapy of a wound (2) a surgical instrument (3) a ready-made set.
