Gas Supply Indicators And Alarms; Fan Failure Alarm/Circuit Disconnect Alarm; Loss Of Air Alarm; Loss Of O 2 Alarm/Loss Of Gas Supply Alarm - CareFusion AVEA Operating Instructions Manual

AVEA ventilator systems
software cannot determine the physical state of the Safety Valve. This is a local alarm only and is not transmitted via
any communication protocol, however other alarms should always be active and transmitted; the primary purpose of this
new alarm message is to provide clarification and differentiation from "Circuit Disconnect" to alert the operator that there
is a potential machine fault.
The first thing the operator should check for is a compressed gas source. If the "Not Ventilating" message is displayed
without an accompanying "Loss of Gas" alarm, the unit should be removed from service.
Fan Failure
This is a low priority audible/visual alarm. FAN FAILURE is displayed and low priority tone sounds, whenever the
circulating fan at the rear of the ventilator cabinet stops rotating.
Circuit Disconnect Alarm
This is a high priority audible / visual alarm. The ventilator will sound a disconnect alarm when total expiratory flow,
inclusive of bias flow is less than 10% of total inspiratory flow, inclusive of bias flow for 5 seconds. Additionally, in
neonatal applications when a proximal flow sensor is used the circuit disconnect is sounded when the Percent Leak
((Vti – Vte) /Vti) is greater than 95% for three consecutive breaths.
If "Loss of Gas" or "Not Ventilating" alarms are active in addition to a "Circuit Disconnect" alarm, the trigger for these
alarms is a loss of system pressure, not a circuit leak or circuit disconnect. See "Loss of Gas Supply" on page 173 and
"Not Ventilating" on page 172 for details and resolution of these conditions.
Note:
While the circuit disconnect alarm is active, the ventilator will stop cycling and set a bias flow. The ventilator will
automatically detect the patient upon reconnection and resume normal ventilation.
The apnea interval timer is suspended during a Patient Circuit Disconnect Alarm.
Setting extremely small delivered tidal volumes with Circuit Compliance Compensation not active and using a proximal
flow sensor may result in assertion of Patient Circuit Disconnect Alarms.

Gas Supply Indicators and Alarms

Loss of Air
This is a high priority audible/visual alarm. LOSS, AIR is displayed and a high priority tone sounds. This alarm is
triggered if the wall air supply to the ventilator drops below 18.0 psig (1.2 bar), and the ventilator does not have a
functional internal compressor or the compressor output is insufficient to meet instrument demand. The patient
continues to be ventilated by the oxygen supply only.
Loss of O
2
This is a high priority audible/visual alarm. LOSS, O
triggered if the oxygen supply to the ventilator drops below 18.0 psig (1.2 bar) and the % O
patient continues be ventilated by the air supply (wall air or internal compressor) only.
Loss of Gas Supply
This is a high priority audible/visual alarm. LOSS, GAS SUPPLY is displayed and a high priority tone sounds. This
alarm is triggered if the ventilator loses all sources of gas (wall air, internal compressor if present, and wall oxygen). The
safety valve opens, indicated by a SAFETY VALVE OPEN visual display, and the patient is allowed to breathe room air.
L2786 Rev. M
Chapter 7: Alarms and Indicators
is displayed and a high priority tone sounds. This alarm is
2
173
control is set >21%. The
2