What is the use of a hyperbaric chamber in wound care?

Hyperbaric oxygen therapy significantly increases oxygen provided to the healing tissue. This is especially important when the wound is infected and has compromised blood supply. Increased oxygen to wounds speeds up the healing process including: collagen deposition, angiogenesis, and bacterial clearance in wounds.

We use it at our hospital's wound healing center. It is a very good adjunctive treatment for non-healing wounds in that it super-saturates the oxygen in the tissues to speed healing in patients who are otherwise compromised by vascular insufficiency, such as diabetics. It has been very helpful in getting some horrible wounds healed.

For many people Hyperbaric chambers can probably be good.
For me, i managed it a few times, but then I just couldn't handle the claustrophobic situation for more and more hours everyday.

The theory is that after the medics test you, you are found not to have enough oxygen being exchanged actively into the blood stream [usually] of your lower extremities, and the blood is not well circulated back up top the heart, because we lack a natural pumping action in the large veins to push the blood back up to the heart.
The lack of oxygen to your lower legs or feet mean any sore you develop there cannot heal.
It becomes ulcerous.

The idea of the hyperbaric chamber is that the increased pressure is supposed to force more blood to circulate and oxygen to be delivered to the lower extremities, thus helping it to heal; but it takes quite a long time, and many treatments, depending on severity.
You are locked into quite a program if you decide to give it a go.