Patent ID: 8460258

Claim:
An altered pressure device for treating a wound in an encapsulated space delimited by a cover secured over a wound, the device comprising: (a) an altered pressure source communicating with the encapsulated space via a length of tubing coupled with the source; and (b) layered intermediate materials composed of at least one foam layer laminated to at least one additional layer, wherein a top layer of the layered intermediate materials, which is one of the at least one foam layer and the at least one additional layer, comprises structural characteristics that enable gas permeation into the encapsulated space when interfacing with the cover, and wherein at least a bottom layer of the layered intermediate materials, which is another of the at least one foam layer and the at least one additional layer, is constructed to discourage tissue in growth and provide an anti-adherence function, the bottom layer being a tissue contact layer, wherein at least one layer of the layered intermediate materials is a hydrophobic semi-solid wound dressing interfacing with wound tissue and adhering to at least one of the layered intermediate materials.