Description
442
Instructions for use Zeus Infinity Empowered SW 2.n
Volume control loop (Auto control,
MinFG flow control mode = "Uptake")
The level in the breathing bag is determined by a
pressure sensor. The volume control loop keeps
the level in the breathing bag constant. The uptake
of the patient as well as possible leakages can be
compensated in conjunction with the concentration
control loop for oxygen. Thus a patient uptake
measurement for oxygen is available. If there is too
much gas in the breathing system, the gas is
drained into the anesthetic gas scavenging system
via the excess gas outlet.
In MAN/SPON mode, the volume control loop is not
active.
Inspiratory oxygen concentration con-
trol
The controller determines the volume and concen-
tration of the fresh-gas flow to be metered. The lat-
ter cannot fall below the fresh-gas flow set by the
user (MinFG flow).
To achieve the new set value quickly (T90 typically
<60 s), the fresh-gas flow is automatically in-
creased with an increase in the O
2. A higher O2
concentration is achieved by metering pure oxygen
(considering the set anesthetic gas concentration).
251
P
V
Closed system
Pressure
sensor
Gas mixing
system
Deficit Excess
252
Set value Inspiratory oxygen concentra-
tion (set point [Vol.%])
Measured values Inspiratory oxygen concentra-
tion measured by patient gas an-
alyzer (PGA) (actual value)
Additional meas-
ured values
Expiratory oxygen concentration
measured in terms of released
breath at the Y-piece
End tidal CO
2 value measured in
terms of released breath at the
Y-piece
Minute volume
Control value Control of mixed gas metering
with the controlled variables
Volume of fresh-gas flow [L/min]
O
2 concentration of fresh-gas
flow [Vol.%]
Patient gas analysis
Patient
Blower
FG mixer
Set value
FiO
2 = 30 %
FiO
2 = 30 %
O
2, agents, CO2
Exp. valve
Circle flow
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