iVent201 Operator's Manual
255
Appendix D: Theory of
Breath Delivery
D.1 Breath Delivery
The iVent
201
is a positive pressure mechanical ventilator that delivers air or
air/oxygen mixture to the patient’s lungs under positive pressure. Each
breathing cycle consists of two phases as described below.
Figure D-1: Pressure Breath Cycle
1. An inspiratory phase, in which
gas is delivered to the patient’s
lungs and airway pressure
increases. At the end of the
inspiratory phase, the ventilator
stops delivering flow and
allows the patient to exhale.
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