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  • Oxygen delivery units designed to halt the oxygen supply during a part of the respiratory cycle. These devices are based on the fact that that oxygen is needed only during the initial phase of inspiration, permitting the interruption of oxygen delivery during the rest of the respiratory cycle. Most units either use a regulator to reduce the time of actual oxygen flow or have a low flow and store oxygen during expiration that is then used as a bolus during inspiration; another approach to control oxygen delivery is the use of a transtracheal catheter. Controlled oxygen delivery units are intended to reduce the oxygen consumption (i.e., conserving oxygen), increasing the mobility of the patient because of the lower weight of the units.
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