REF 1029568 Rev A BiPAP® Focus™ Ventilator Service Manual © Respironics, Inc. 3-1
Chapter 3. Theory of Operation
The BiPAP® Focus™ Ventilator System provides noninvasive breathing
support for adult patients weighing 30 kg (66 lbs.) or greater.
The BiPAP Focus System 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.
The BiPAP Focus System alarms annunciate when high or low pressure
regulation, apnea, patient disconnect, low power, or loss of mains power
conditions occur. The system displays a real-time estimated delivered pressure
bar graph.
An Apnea Rate (#Apnea) Alarm is provided to alert the caregiver to repeated
periods of short apneas of 10 seconds or more. The caregiver can set the value
for how many apnea periods (10 seconds or more) can occur within an hour
before alarming. The total number of Apnea periods (10 seconds or more) for
the previous hour is displayed as part of the patient data. Because the previous
hours data is displayed, the number of apnea periods for the first hour is an
estimate only.
The BiPAP Focus System includes alarm silence and alarm pre-silence
features. Battery backup 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 System features Digital Auto-Trak™, which allows it to
recognize and compensate for unintentional leaks and promote synchrony by
adjusting its trigger and cycle algorithms to maintain optimum performance.
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