Patent ID: 7731954

Claim:
A skin dressing comprising a layered construction, said layered construction including one or more oxidoreductase enzymes in hydrated condition and present in sufficient amount to catalyze, in the presence of appropriate substrate, the conversion of atmospheric oxygen to hydrogen peroxide for transmittal through the dressing to the skin, wherein at least the enzyme-containing layer of the dressing is sealed in packaging and maintained in hydrated and sterile condition in said packaging up to use, wherein said layered construction comprises an upper layer and a lower layer, said upper layer being remote from the skin in use and including the oxidoreductase enzyme, and said lower layer being below the upper layer in use such that hydrogen peroxide which is formed and transported through the dressing is discharged at the skin for conversion to oxygen, said lower layer comprising a hydrogel including said source of substrate for the oxidoreductase enzyme, said oxidoreductase enzyme being included only in said upper layer and remaining in the upper layer in use.