Respironics BiPAP Focus - Measured Data

Chapter 3
3-8 BiPAP® Focus™ Ventilator Service Manual © Respironics, Inc. REF 1029568 Rev A
Theory of Operation
Measured Data
Patient circuit pressure bar
graph (continuous display)
Range: 0-35 cmH
2
O (0-35 hPa)
Resolution: 1 cmH
2
O (1hPa)
Accuracy: ±10% of scale
In the event of total loss of power, the inspiratory
and expiratory pressure measured at the patient
exhalation port at 60 L/min is less than 1 cmH
2
O
by virtue of mask and ventilator design.
Rate
Measured respiratory rate
Range: 0-60/min
Resolution: 1/min
Accuracy: ± (1 + 10% reading)
Est. Vt
Estimated delivered tidal
volume
Range: 0-4000 mL
Resolution: 1 mL
Accuracy (S/T Mode): ± (50 mL + 10% reading)
(when leak <60 L/min, using the Vision circuit)
Accuracy (CPAP Mode): ± (100 mL + 10%
reading) (when leak <60 L/min, using the Vision
circuit)
Vt display flashes when peak inspiratory flow for
successive breaths varies by more than 15 L/
min.
Est. MV
Estimated exhaled minute
volume
Range: 0-99 L/min
Resolution: 0.1 L/min
Accuracy: ± 1 L or ± 10% actual, whichever is
greater (when leak is <60 L/min using the Vision
circuit).
Leak
Estimated Patient leak
Range: 0-150 L/min
Resolution: 1 L/min
Accuracy: ± (15 L/min +10%)
#Apnea
Brief apnea periods
Range: 0-99/hour
Resolution: 1/hour
Accuracy: ± 1/hour (after 1 hour)
Trigger
Breath trigger
Range: Patient or Timed (ventilator)
NOTE: Est. Vt and Est. MV estimates are at ambient temperature and pressure, dry
(ATPD). Pressure signals are filtered using a 50-Hz low pass Butterworth filter.