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  2. High altitude breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/High_altitude_breathing...

    by gas supply type: constant flow, supply on demand, or supplemental, by ventilatory driving force: the breathing effort of the user, or mechanical work from an external source, by gas mixture: air, oxygen enriched, or pure oxygen. The user respiratory interface is the delivery system by which the breathing apparatus guides the breathing gas ...

  3. Diving air compressor - Wikipedia

    en.wikipedia.org/wiki/Diving_air_compressor

    A diving air compressor is a breathing air compressor that can provide breathing air directly to a surface-supplied diver, or fill diving cylinders with high-pressure air pure enough to be used as a hyperbaric breathing gas. A low pressure diving air compressor usually has a delivery pressure of up to 30 bar, which is regulated to suit the ...

  4. Breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/Breathing_apparatus

    The ambient pressure underwater varies with the depth, and diver attitude in the water can affect the variation in pressure between the lungs and the delivered gas in the mouthpiece by up to about 250 mm water (25 mb), but usually less, which can be positive or negative depending on the relative position of the lungs to the demand valve ...

  5. Resuscitator - Wikipedia

    en.wikipedia.org/wiki/Resuscitator

    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.

  6. Work of breathing - Wikipedia

    en.wikipedia.org/wiki/Work_of_breathing

    The normal relaxed state of the lung and chest is partially empty. Further exhalation requires muscular work. Inhalation is an active process requiring work. [4] Some of this work is to overcome frictional resistance to flow, and part is used to deform elastic tissues, and is stored as potential energy, which is recovered during the passive process of exhalation, Tidal breathing is breathing ...

  7. Ventilator - Wikipedia

    en.wikipedia.org/wiki/Ventilator

    The ventilator pushes warm, moist air (or air with increased oxygen) to the patient. Exhaled air flows away from the patient. In its simplest form, a modern positive pressure ventilator, consists of a compressible air reservoir or turbine, air and oxygen supplies, a set of valves and tubes, and a disposable or reusable "patient circuit". The ...

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