Controlled oxygen dressing

A controlled oxygen dressing for tissue treatment, the dressing comprising:

• a flexible drape being permeable to air, having a first area, including a skin-facing surface and an exposed surface which is opposite the skin-facing surface, the drape being made from a thin flexible continuous sheet that does not include openings extending from the skin-facing surface to the exposed surface that allow bulk transfer or a continuum flow of air through the openings, and being configured to be adhered to skin and thereby define a first volume around a tissue site between the skin-facing surface and the skin;
• an adhesive gasket arranged around a periphery of the skin-facing surface of the drape to adhere the dressing to the skin;
• a cover layer configured to be sealed to the exposed surface and thereby cover a covered portion of the exposed surface of the drape and define a second volume between the cover layer and the covered portion;
• and
• an oxygen scavenger configured to be arranged in the second volume to remove oxygen from the second volume such that oxygen from the first volume permeates through the covered portion of the drape to provide a desired level of oxygen in the first volume,
• wherein the cover layer has a second area smaller than the first area of the drape configured to provide the desired level of oxygen for the first volume, and
• wherein when the cover layer is sealed to the drape, a non-covered portion of the drape is provided between a periphery of the cover layer and the adhesive gasket, wherein oxygen from a surrounding environment is limited to diffusing into the first volume through the non-covered portion of the drape and a pressure within the first volume around the tissue site is maintained at about atmospheric pressure and not lowered to between −60 and −125 mmHg with respect to atmospheric pressure.