The invention relates to a contact layer (16) for a negative pressure wound treatment system (10), the use of such a layer and a method for applying such a layer in a negative pressure wound treatment system as well as a method of treating an abdominal wound or open abdomen wherein an abdominal cavity is accessible for negative pressure therapy. The contact layer (16) is provided with at least one inflatable channel (102, 102a, 102b, 102c, 102d, 102e) which is provided with an opening (104) for inflation or deflation of a fluid. The inclusion of these channel is due to the problem associated with applying the negative pressure wound therapy system and to place the contact layer (16) accurately. The contact layer (16) should be made flexible in order to be kept close to the intestines and to be possible to wrinkle or fold it in order to fit into the wound. However, there is also a problem in keeping it in the desired position once this is achieved since the contact layer is thin and lacks rigidity and stability and may thus easily be dislocated. The present contact layer will thus provide a solution to these problems by allowing the inflatable channel or channels(102, 102a, 102b, 102c, 102d, 102e) to be in an uninflated, or slightly inflated, state from the start to be able to easily wrinkle and fold the contact layer (16) first and thereafter, during or after placing the contact layer (16) in its intended position, inflating the channel or channels (102, 102a, 102b, 102c, 102d, 102e) to increase the rigidity and stability to help to keep the contact layer (16) in its desired position.L'invention concerne une couche de contact (16) pour un système de traitement de plaies par pression négative (10), l'utilisation d'une telle couche et un procédé d'application d'une telle couche dans un système de traitement de plaies par pression négative ainsi qu'un procédé de traitement d'une plaie abdominale ou d'un abdomen ouvert dans lequel une cavité abdominale est accessible po
