12
Oxygen concentration: variable, 21% to 100% with external blender.
Respiratory rate: variable, 1
1
/
3
to 66 breaths/min.
Tidal volume: variable, 0 to over 3000 ml.
I/E ratio: variable.
Respiratory and I/E ratio are determined by INSP. TIME and EXP. TIME control
settings. These settings are repeatable within 5%.
1
For greater accuracy of
settings and external monitoring device may be used.
Oxygen concentration is varied by the use of an external accessory blender or
premixed gas supply. Care should be taken to select a blender capable of
maintaining constant supply pressure over the full range of flow rates that the IC-2A
provides. As with all ventilation systems, the O
2
concentration should be tested
periodically with an oxygen analyzer.
The tidal volume, when the ventilator is operated in a volume limited mode, is the
product of flow rate (converted to ml/sec) and inspiratory time:
TIDAL VOLUME (ml) = FLOW RATE (ml/sec) X INSPIRATORY TIME (sec)
NOTE: Flow rate is not Minute Volume
MINUTE VOLUME = TIDAL VOLUME X RESPIRATORY RATE
It should be noted that the MAX PRESSURE and PEEP/CPAP control settings are
affected slightly by flow. When flow is increased, the pressure levels set by these
controls will increase somewhat. These changes may be noted on the pressure
gauge and the settings readjusted.
1
At elevations above sea level, the intervals set by the INSP. TIME and EXP. TIME controls are
increased due to lower barometric pressure. The difference is about 2.5% per 1000' of elevation. With
an air supply connected to the POWER OXYGEN inlet fitting, the time intervals are about 10% less than
with pure oxygen connected.
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