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5. The flow rate displayed on the LCD screen indicates the flow rate exiting the
Patient Circuit Connection. The "Target" flow is pre-set based on the CPAP setting.
The flow is automatically adjusted to maintain the CPAP setting and it may normally
vary from the Target flow.
6. The driver will automatically increase flow up to 3 lpm above the Target flow to
compensate for normal leaks (i.e. leaks around prongs, masks, or through the
patient's mouth).
7.5.2 Standby Mode
Standby Mode allows the operator to mute the alarms for up to 20 minutes while at the
bedside attending to the patient. Select this mode by pressing and holding the Alarm
Mute/Reset button until there is a single audible burst (approximately 3 seconds). The
operator can exit the mode by pressing the Alarm Mute/Reset button or the system will
automatically exit the mode and resume normal operation after 20 minutes. While in
Standby Mode the system will operate normally with all audible alarms muted, with the
exception of High Pressure and Low Flow. To indicate that the system is in Standby Mode,
the Message Bar will display "Standby Mode" and the Alarm Mute LEDs will flash. There
will also be a single audible burst every two (2) minutes while in Standby Mode. The driver
will exit Standby Mode automatically if a High Pressure or Low Flow alarm occurs.
7.5.3 Air or Oxygen Only Mode
While switching Air and Oxygen supply hoses from one source to another (e.g. switching
from tanks to wall sources), only change one source at a time. This will help prevent
interruptions in fresh gas flow to the patient. The AirLife
used with a single gas source if one gas source goes outside of the specified pressure
range (e.g. running out of gas) during normal operation. During such an event, the driver
will alarm and display the source fault in the Message Bar. In the absence of one gas
source, the patient can only receive air (FiO
cannot be corrected immediately, then the user may select "Air Only" or "Oxygen Only"
operation in order to mute the alarm while the faulty gas source is corrected. When the
faulty source pressure is corrected, the system will automatically return to normal operation
(alarms will be delayed for 20 seconds) and blend gases to the previously set FiO
© © © © 2008, Cardinal Health
If a large leak exists at the patient, that cannot be corrected by adjusting the
patient interfaces, then the Target flow may be set higher (up to 13 lpm) to
provide more flow to compensate for leaks. If the leak is resolved, the driver
will automatically reduce the flow to maintain the set CPAP level.
The flow rate should not be less than 3 lpm. A "Low Flow" alarm will activate
if the measured flow rate is less than 3 lpm and would indicate a possible
occlusion of the expiratory limb or a defective circuit / generator. If this alarm
occurs, check for pinched or kinked tubing, or replace the circuit and / or
generator.
AirLife
®
~ 21%) or Oxygen (FiO
2
Page 24 of 81
®
nCPAP Driver Service Manual
nCPAP System Driver may be
= 100%). If the fault
2
value.
2
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