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Closed circuit rebreather: A closed circuit rebreather adds oxygen to the loop gas to make up for oxygen used by metabolic processes. These processes do not use diluent gas, so none is added unless the volume of the loop is reduced for other reasons, such as intentional dumping, flushing, or an ambient pressure change.
non-rebreather mask A non-rebreather mask (NRB) is a device used to deliver supplemental oxygen to a spontaneously breathing person. An NRB allows the delivery of relatively high concentrations of oxygen while using a constant flow rate, with relatively low waste, by accumulating the oxygen flow during exhalation in a soft bag, to be inhaled at ...
A Diving rebreather is an underwater breathing apparatus that absorbs the carbon dioxide of a diver's exhaled breath to permit the rebreathing (recycling) of the substantially unused oxygen content, and unused inert content when present, of each breath.
A system which accumulates free-flow oxygen during resting and exhalation stages, (reservoir cannulas, partial rebreather masks and non-rebreather masks) makes a larger part of the oxygen available for inhalation, and it will be selectively inhaled during the initial part of inhalation, which reaches furthest into the lungs, and may also ...
Both types of mask masks use a reservoir bag which can economise on oxygen consumption when the flow rate is set correctly for the current breathing rate by ensuring that the reservoir bag fully deflates at the end of inhalation and fully inflates by the end of exhalation. Some field user maintenance is possible using the spare parts kit.
A malfunctioning rebreather can supply a gas mixture which contains too little oxygen to sustain life, too much oxygen which may cause convulsions, or it may allow carbon dioxide to build up to dangerous levels. Some rebreather designers try to solve these problems by monitoring the system with electronics, sensors and alarm systems.
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