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2. High altitude breathing apparatus - Wikipedia

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

   Pulse dose (also called intermittent-flow or on-demand) portable oxygen concentrators are the smallest units, which may weigh as little as 2.3 kilograms (5 lb) Their small size enables the user to waste less of the energy gained from the treatment on carrying them. The unit administers a set volume (bolus) of oxygen enriched air at the start of ...

3. Portable oxygen concentrator - Wikipedia

   en.wikipedia.org/wiki/Portable_oxygen_concentrator

   This increases the device’s size and weight (approximately 18–20 lbs). [13] With on-demand or pulse flow, delivery is measured by the size (in milliliters) of the "bolus" of oxygen per breath. Some Portable Oxygen Concentrator units offer both continuous flow as well as pulse flow oxygen. [14]

4. Oxygen therapy - Wikipedia

   en.wikipedia.org/wiki/Oxygen_therapy

   A similar function is provided by a mechanical demand regulator which provides gas only during inhalation, but requires some physical effort by the user, and also ventilates dead space with oxygen. A third class of system (pulse dose oxygen conserving device, or demand pulse devices) senses the start of inhalation and provides a metered bolus ...

5. Breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Breathing_apparatus

   This class of device can also be used with portable oxygen concentrators, making them more efficient. [43] A pulse dose oxygen conserving device, (or demand pulse device) senses the start of inhalation and provides a metered bolus, which, if correctly matched to requirements, will be sufficient and effectively inhaled into the alveoli. Such ...

6. Glossary of breathing apparatus terminology - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_breathing...

   pulse dose oxygen conserving device demand pulse device Oxygen delivery device that senses the start of inhalation and provides a metered bolus, which if correctly matched to requirements, will be sufficient and effectively inhaled into the alveoli. Such systems can be pneumatically or electrically controlled. [60] pulse oximeter

7. Oxygen concentrator - Wikipedia

   en.wikipedia.org/wiki/Oxygen_concentrator

   An oxygen concentrator is a device that concentrates the oxygen from a gas supply (typically ambient air) by selectively removing nitrogen to supply an oxygen-enriched product gas stream. They are used industrially, to provide supplemental oxygen at high altitudes, and as medical devices for oxygen therapy .