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ESO 2 ICU Ventilator 46 User Manual
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Ventilation Cycle
This section provides a simplified description of the ventilation
cycle.
1. Inspiratory Phase
The drive gas proportional valve (1) in the control unit opens.
Drive gas is delivered to the bellows housing inlet (2).
The patient proportional valve (3) opens, and gas flows through
the bleed valve. The back pressure ensures that the exhaust
valve (4) is kept closed.
Drive gas pressure builds up above the bellows (5), which
starts to move down. The diaphragm (6) in the bellows
assembly base is held closed, and patient gas is forced out of
the bellows base (7) into the breathing system.
2. Beginning of Expiratory Phase
The drive gas proportional valve (1) closes, and the patient
proportional valve (3) closes.
The exhaust valve (4) opens
Patient gas returns to the bellows (5), and as the bellows rises,
redundant drive gas is pushed out through the exhaust valve.
3. End of Expiratory Phase
With the bellows (5) at the top of its housing, fresh gas
continues to flow. To prevent a high pressure build up the
exhalation diaphragm (6) lifts and allows gas to exit through
the exhaust valve (4).
4. PEEP Positive End Expiratory Pressure (user selectable)
At the beginning of the expiratory phase the patient
proportional valve (3) applies a PEEP related pressure to the
exhaust valve (4). Provided the pressure is above the required
PEEP value, the bellows (5) will rise as the patient exhales.
When the bellows is fully inflated, any redundant drive gas
leaves the system through the diaphragm (6).
If the pressure falls below the required PEEP value, the
exhaust valve will close and the fresh gas supplied will
increase the pressure maintaining PEEP.
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