Oxygen Mixing - Respironics V60 User Manual

Oxygen mixing

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The ventilator's oxygen mixer regulates and proportions oxygen into the air
from the blower according to the O
±5% of the set value up to the maximum oxygen flow available. The ventilator
can deliver up to 240 L/min of air/oxygen mix to assist in managing
uncontrolled leaks during noninvasive ventilation.
Many hospital oxygen supply systems, however, cannot meet such high flow
demands. Under extraordinary conditions (high O
or high patient demand) where demand exceeds available oxygen system flow,
the ventilator provides additional air flow from the blower to ensure the target
pressure is met. Under such conditions, the accuracy of delivered oxygen may
be affected. Figure 4-16 shows the effect on the delivered oxygen
concentration as the maximum oxygen system flow is exceeded. This graph
assumes a continuous flow demand. Normally the higher "peak" flow is only
needed during inspiration, so this is a worst case scenario.
140 150 160
Assumptions: At an O setting of 100% and an oxygen supply with a 50 psig inlet pressure capable
2
of delivering up to160 L/min.
Figure 4-16: O
setting. The delivered oxygen accuracy is
2
170 180 190 200
Total ventilator flow (L/min) Total Ventilator Flow L/min
concentration as a function of total ventilator flow
2
Principles of operation
setting plus high leak, and/
2
210 220 230
4-15
240