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Ahyperbaric stretcher is a lightweightpressure vessel for human occupancy (PVHO) designed to accommodate one person undergoing initialhyperbaric treatment during or while awaiting transport or transfer to a treatmentchamber.[1][2]
Originally developed as advanceddiving equipment, it has since been used for other medical conditions such asaltitude sickness,carbon monoxide poisoning andsmoke inhalation, air and gasembolism and is viewed as potentially important equipment for the early treatment of blast related injuries within the combat zone with the anticipated benefit thattraumatic brain injury may not develop in the ensuing months.[2]
There is currently only one unit approved under the US National Standard - ASME PVHO-1 (2007) and Case 12. This unit, known as the SOS Hyperlite or by the US military as the EEHS (Emergency Evacuation Hyperbaric Stretcher) is, or has been, in service with the US Army, Navy, Air Force, Coast Guard, NOAA and NASA as well as being supplied to other Government Agencies. The EEHS has a length of 2.26 metres (89 inches) and a diameter of 59 cm. (23.5 inches) and operates at a pressure of up to 2.3 bar (33 psi) above ambient pressure with a built-in safety factor of over 6:1. It is pressurised with air and the occupant breathes oxygen or air through a demand mask (BIBS) during treatment.[2]
The Hyperlite also complies with Lloyds Register and ISO 9001/2000 requirements, and is CE marked. It has applications in military, commercial, scientific, and recreational diving, and in hyperbaric medicine. It is made of flexible material and when the internal pressure matches the external pressure, it is collapsible, which can make transfer under pressure possible with relatively small hyperbaric chambers.[2]
A hyperbaric stretcher must be portable, and should be compatible with transfer under pressure to and from full size hyperbaric chambers. This can be achieved by making the unit small enough to be loaded inside the hyperbaric facility for transfer under pressure,[2] or by having a mating flange compatible with the larger chamber, by way of an adapter if necessary. Some types of treatment may be done in the hyperbaric stretcher, provided the patient is sufficiently fit for unattended recompression.[2]
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