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•
Insufficient pressure support alarm
Is triggered if for 3 breaths in a row the maximum mask pressure achieved at
inspiratory to expiratory transition is either <87 .5% of the absolute mask
pressure targetted at that point, or < absolute mask pressure targeted minus
1 cm H
•
High leak alarm
Leak exceeds 30 L/min for more than 20 seconds.
•
Flow blocked alarm
Flow is less than 6 L/min for more than 20 seconds.
IEC 601-1 classifications
Class II, Type CF
Class II medical electrical equipment provides protection against electric shock
either by double insulation or reinforced insulation and does not require a
protective ground.
Inspiratory Trigger Characteristics
The inspiratory trigger occurs at a flow greater than 0 LPM when tested with
EPAP=5 cm H
trigger response time is <600 ms when tested with EPAP=5 cm H
IPAP=15 cm H
measured from the beginning of inspiratory flow to the beginning of pressure
rise to IPAP.
Note: The ASV algorithm is designed to treat a patient with essentially normal
lungs. Hence, trigger response is less sensitive and pressure ramp-up is more
gentle than typical non-invasive ventilators.
Table 3: Displayed values
Value
Proximal cuff
Pressure
Mass flow
sensor
Leak
Respiratory rate
Tidal volume
Minute
ventilation
Target MV
40
O, whichever is the lower.
2
O, IPAP=15cm H
O, sinisoidal breath shape. The inspiratory
2
2
O, 0.67 L/sec inspiratory and expiratory flow rate. The time is
2
Range
-3 to 40 cm H
O
2
0–99 L/min
8–30 breaths per minute
0–4500 mL
0–40 L/min
0–40 L/min
O,
2
Accuracy
Display Resolution
0.5 cm H
O
0.1 cm H
O
2
2
+/- 12 L/min
1 L/breath
+/- 10%
1 breath per minute
+/- 10%
1 mL
+/- 10%
0.1 L/min
+/- 10%
0.1 L/min
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