Airon pNeuton A, Operator'S Manual

Page: 43 / 64

pNeuton Ventilator 7 - 7
Spontaneous Breaths
Spontaneous breaths are available from the internal CPAP
system which uses a venturi mechanism separate from the
mandatory breath high flow venturi. When turned on by
the PEEP / CPAP control, the system delivers
approximately 10 L/min baseline flow during the expiratory
time of the ventilator.
The F
I
O
2
of this system is set by the % Oxygen control.
When set for 65%, the actual oxygen percentage and
baseline flow is related to the level of CPAP in use. Up to
10 cm H
2
O CPAP will provide a F
I
O
2
of approximately 0.65
+ 0.10. As the CPAP level raises to 20 cm H
2
O, the F
I
O
2
can be expected to increase to as high as 0.75 + 0.10.
This is due to a drop off in efficiency (stalling) of the CPAP
venturi system at higher CPAP levels. The actual F
I
O
2
of
spontaneous breaths will be approximately the same as
the baseline flow. Whether set for 65% or 100%,
extremely high inspiratory flow demand may decrease the
desired F
I
O
2
.
It is recommended that an external oxygen monitor be
used at all times to measure and display the delivered
oxygen concentration.
WARNING: Never operate the ventilator without
proper oxygen gas supply at the required pressure.
Factors Effecting the Operating Time of Oxygen Tanks
There are several factors that affect the length of time the
ventilator will operate from a tank of oxygen. The ventilator
uses very little gas for its own operation (less than 4 L/min)
and is not a major factor in oxygen tank consumption. The
major factors are:

Volume of oxygen in the tank

Patient's tidal volume and rate

Position of the % Oxygen control

If the PEEP / CPAP system is on or off