Hyperbaric chamber.

Hyperbaric Oxygen Therapy HBOT is a treatment where a patient will breathe 100% pure oxigen in a chamber with a greater pressure than the atmospheric pressure. Every cell in the human body will be saturated with oxygen when a person breathes 100% oxygen at a greater pressure. This results in the increase of tissue repair rate caused by injuries or ilness. Because of this effect, HBOT has been used widely to treat a variety of illness such as burns & radiation injuries, non-healing wounds, gangrene (diabetic wounds), cerebral palsy & autism, multiple sclerosis, stroke, sport injuries, arterial gas embolism & decompression sickness, severe anemia, osteomyelitis (refractory), crush injury and acute trauma.

From what i have heard and learnt Hyperbaric chambers are used for increasing the cell growth and thus repairment process , it saturates the cells with oxygen making them hyperactive in cell division thus new cells are born and repairment starts.