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Excess gas due to expansion during ascent is vented through the overpressure relief valve. The proportionality of the discharge counterlung volume to depth is lost below a depth of around 90 m (10 bar) so the gas saving below this depth is not as great as for shallower dives.
The device must have a pressure relief valve that opens at 60cm of water pressure to avoid over ventilation and trauma to the lungs. The (FROPVD) is contraindicated in adult patients with potential chest trauma and all children. Note: ( In cases with an apneic patient the best results will be achieved using the Two person bag-valve-mask technique.)
The Halcyon RB80 is a non-depth-compensated passive addition semi-closed circuit rebreather of similar external dimensions to a standard AL80 scuba cylinder (11-litre, 207-bar aluminium cylinder, 185 mm diameter and about 660 mm long).
A resuscitator is a device using positive pressure to inflate the lungs of an unconscious person who is not breathing, in order to keep them oxygenated and alive. [citation needed] There are three basic types: a manual version (also known as a bag valve mask) consisting of a mask and a large hand-squeezed plastic bulb using ambient air, or with supplemental oxygen from a high-pressure tank.
Draeger Ray dive/surface valve with bite grip scuba mouthpiece, non-return valves, and breathing hoses. A breathing hose or sometimes breathing tube on a rebreather is a flexible tube for breathing gas to pass through at ambient pressure. They are distinguished from the low-, intermediate-, and high-pressure hoses which may also be parts of ...
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 the start of the ...
A spacer is a device designed to make an asthma inhaler easier to use. ... breathing in and out of the mouthpiece several times is just as good. ️ If you need another dose, wait 30 seconds ...
To try to get rid of that heat, the breathing gas is passed through a damp chamber, so the damp will absorb some heat as it evaporates, as in some air conditioning units. It is not very effective, in normal use the breathing air temperature of the SEFA will rapidly exceed 45 °C, and more under heavy work.
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