
3.2
Ventilation Cycle
This section provides a simplified description of the ventilation cycle.
1.
Inspiratory Phase
The inspiratory proportional
valve (1) in the control unit
opens, and bellows drive
gas is delivered to the
bellows housing (2).
The expiratory 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, which
starts to move down.
The diaphragm (5) in the
bellows assembly base is
held closed, and patient gas
is forced out of the bellows
base (6) into the breathing
system.
2.
Beginning of
Expiratory Phase
The Inspiratory (1) and
Expiratory (3) proportional
valves close and the exhaust
valve (4) opens. Patient gas
returns to the bellows. As
the bellows rises, redundant
drive gas is pushed out
through the exhaust valve.
DESCRIPTION
11
1
4
4
5
6
2
3
3
1
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