Therapuetic Diffusion Hydrocolloid Wound Dressings with Methods of Oxygen Level Indication

A therapeutic wound dressing, comprising:

• a reservoir having a two-dimensional footprint formed between an upper layer not permeable to gases, and a lower layer permeable to gases;
• an adhesion layer overlapping periphery of the upper, non-permeable layer and extending beyond periphery of the two-dimensional footprint, the adhesion material facing in the direction of the permeable layer, such that the adhesion layer may be pressed to skin of a patient around a wound, sealing the dressing to the patient with the permeable layer directly over the wound;
• and
• one or the other of an oxygen-level indicator containing a material exhibiting color change with varying concentration of oxygen, the indicator placed to be visible to a person viewing the dressing through an interface not permeable to oxygen, and to be open to oxygen through a second interface in intimate contact with oxygen in the reservoir, or a self-sealing opening through which a hollow tube may pass without allowing oxygen to escape, the self-sealing opening useful for charging the reservoir with oxygen at pressure, or for sampling oxygen in the reservoir by an external probe.