Many chronic wounds are starved for oxygen, meaning the body cannot get oxygen via the blood stream to the area of injury. This is usually due to a patient's medical conditions.
Hyperbaric oxygen therapy is a treatment that works to heal wounds using several different mechanisms. It kickstarts wound healing by delivering oxygen, dissolved in the blood at high concentrations, to a chronically oxygen starved wound. It "turns on" many different types of important wound healing cells that need oxygen to work. This promotes the production of collagen, a vital ingredient in wound healing, which leads to the rapid growth of new blood vessels in the area. It also helps to fight infection by killing bacteria, and promoting the effects of different types of antibiotics. All of this translates to an accelerated healing process.