Theory Of Operation - Respironics BiPAP Service Manual

Chapter 3. Theory of Operation
REF 1029568 Rev B
The BiPAP Focus ventilator provides noninvasive breathing support for adult
patients weighing 30 kg (66 lbs.) or more.
The BiPAP Focus offers two ventilation modes:
• Continuous positive airway pressure (CPAP), which provides a single
level of positive pressure to the patient.
• Spontaneous/timed (S/T), which provides two levels of positive
pressure (one during inspiration and one during exhalation), and
delivers timed breaths if the patient does not initiate a breath.
Ventilator alarms occur when high or low pressure, apnea, patient disconnect,
low power, or loss of AC power conditions occur. The system displays a real-
time estimated delivered pressure bar graph.
The BiPAP Focus includes alarm silence and alarm pre-silence features. A fully
charged backup battery provides a minimum of 45 minutes of backup power at
default settings in case AC power is not available (for example, during
transport within the hospital).
The BiPAP Focus features Digital Auto-Trak, which the ventilator to detect and
compensate for unintentional leaks, and adjust its trigger and cycle algorithms
to maintain optimum performance.
BiPAP Focus Ventilator Service Manual © Respironics, Inc.
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