The demand module is interposed between the pressurized oxygen source and the patient. As the patient inhales, inspiratory airflow is detected by pressure changes in the nasal cannula. A solenoid in the module is rapidly opened and closed, enabling a pulse of oxygen to be delivered at the beginning of inhalation.
Data from: Tiep BL. Electronic pulse oxygen. In: Portable Oxygen Therapy: Including Oxygen Conserving Methodology, Tiep BL (Ed), Futura Publishing, Mt Kisco, New York, 1991.
Graphic 69597 Version 3.0
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