Check Valves - GE Datex-Ohmeda Aisys Carestation Reference Manual

Aisys
7.6.1 Check
Valves
7-8
Make sure that the check valves on the breathing circuit module work correctly: The
Inspiratory check valve rises during inspiration and falls at the start of expiration. The
Expiratory check valve rises during expiration and falls at the start of inspiration. A leak
across one of the check valves may be great enough to cause a "reverse flow" alarm.
Inspiratory check valve
1. Set the system switch to On.
2. Set fresh gas flow to 200 ml/min (minimum).
3. If equipped with an ACGO, connect a tube between the ACGO outlet and the
Inspiratory port.
• Set the ACGO switch to the ACGO position.
• Verify that the Airway Pressure reading increases to 10 cm H
30 seconds.
4. If not equipped with an ACGO, select End Case and connect a tube to the Inspiratory
port.
• Stretch the tube approximately 5 cm.
• Occlude the open end of the tube.
• Release the tension on the tube.
• Ensure that the Airway Pressure reading increases to between 20 and 40 cm H
If not, repeat the above steps, but stretch the tube a little further.
• Verify that the Airway Pressure reading does not drop by more than 10 cm H
30 seconds.
Expiratory check valve
1. Set all gas flows to minimum.
2. Set the Bag/Vent switch to Bag.
3. Fully close the APL valve (70 cm H
4. Connect a tube between the Inspiratory port and the Bag port.
5. Slowly increase the O
2
• The leak rate is equal to the flow needed to maintain 30 cm H
• The leak rate should be less than 500 mL/min.
O).
2
flow to achieve 30 cm H O.
2
O in
2
O.
2
O in
2
O.
2
04/08 M1046983