Patent ID: 7761945

Claim:
A method comprising: providing a hyperbaric environment having an elevated oxygen content, the elevated oxygen content being higher in oxygen than an average oxygen content of atmospheric air, the hyperbaric environment comprising as much as 100% oxygen, and the hyperbaric environment being free of potential combustion ignition sources; providing a mattress completely contained in the hyperbaric environment, the mattress being removable from the hyperbaric environment, the mattress being usable outside the hyperbaric environment, the mattress having at least two internal chambers, and the mattress being free of potential combustion ignition sources, wherein each chamber is adapted to be independently pressurized relative to an ambient pressure within the hyperbaric environment and when pressurized, each chamber is adapted to independently support a reclined body on the mattress; providing pressurization to the mattress, wherein the pressurization is driven and regulated only pneumatically; providing support for a body with a first chamber while a second chamber is depressurized at a first time; and providing support for a body with the second chamber while the first chamber is depressurized at a second time.