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A Zen-O portable oxygen concentrator; it is capable of pulse and continuous flow operation. The most important consideration for a POC is its ability to supply adequate supplementary oxygen to relieve hypoxia (oxygen deficiency) during normal activities and based on the patient's breathing cycles.
Some of the portables are actually less efficient in terms of power and weight than the larger 5 LPM concentrators. The pulse portable oxygen concentrators (those which have no continuous flow settings) typically make less than 1 liter per minute, but use demand or pulse flow to deliver oxygen only when the patient is inhaling and consume about ...
Usually, "demand," or pulse-flow, oxygen concentrators are not used by patients while they sleep. There have been problems with the oxygen concentrators not being able to detect when the sleeping patient is inhaling. Some larger portable oxygen concentrators are designed to operate in a continuous-flow mode in addition to pulse-flow mode.
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 ...
Large oxygen cylinders hold a volume of 6,500 litres (230 cu ft) and can last about two days at a flow rate of 2 litres per minute (LPM). A small portable M6 (B) cylinder holds 164 or 170 litres (5.8 or 6.0 cu ft) and weighs about 1.3 to 1.6 kilograms (2.9 to 3.5 lb). [62]
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