Circuit Resistance Test - CareFusion AVEA Operating Instructions Manual

AVEA ventilator systems Appendix E: Sensor Specifications & Circuit Resistance

Circuit Resistance Test

The resistance of a neonatal patient circuit should be tested for proper functionality of the ventilator for neonatal patient
size applications. Excessive circuit resistance under these circumstances may result in triggering a Circuit Occlusion
Alarm.
This resistance test applies to all neonatal applications except nCPAP.
1. To measure the resistance of the breathing circuit, set-up the system as follows:
Mode
Flow Correction
Rate
Inspiratory Pressure
Peak Flow
Inspiratory Time
PEEP
Flow Trigger
Pressure trigger
% O
2
Bias Flow
Humidifier
Patient circuit
Expiratory Filter
Test Lung
2. Select waveforms Pinsp and Paw.
3. With the patient wye blocked, allow a TCPL breath to occur, and then press the FREEZE key and scroll the Cursor Line
with the data dial until it is positioned in the middle of the inspiration portion of the breath.
4. Read the pressure from the Pinsp and Paw waveforms from the Cursor Line data.
5. Subtract Paw from Pinsp. Pinsp – Paw = X cmH
6. The resulting pressure difference (X cmH2O) must not exceed 3.1cmH
been an occlusion alarm active for that breath.
7. Reset the "Flow Correction" setting in the Utility screen to "BTPS" (normal setting for patient use).
Note:
We do not recommend using a neonatal circuit in a pediatric patient size application.
L2786 Rev. M
TCPL AC
ATPD (Set in utility screen, configuration tab)
4
10 cmH O
2
15 L/min
3.0 sec
0 cmH O
2
20 L/min
20 cmH O
2
21 % (no Heliox)
2 L/min
Dry chamber inline, humidifier power off
Clean and dry
Installed, clean and dry
Not used, block the wye
O
2
O at a flow of 15 L/min, and there must not have
2
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