demand oxygen delivery device
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Related to demand oxygen delivery device: pressure demand oxygen system
de·mand ox·y·gen de·li·ver·y de·vice(dĕ-mand' ok'si-jĕn dĕ-liv'ĕr-ē dĕ-vīs')
Apparatus that conserves oxygen by sensing the initiation of an inspiratory effort and then delivering oxygen only during that phase. Usually attached to a nasal cannula.