Instructions for use Zeus Infinity Empowered SW 2.n 443
Description
If the O
2 set value is lowered, the fresh-gas flow is
not increased beyond the set minimum flow. In Up-
take mode, the O
2 concentration drops solely on
account of the O2 uptake flow.
To set a lower O
2 concentration, carrier gas is
added and the oxygen concentration cannot fall be-
low 21 Vol.% in the fresh gas. Regulation in the car-
rier gas N
2O is thus identical to that of the carrier
gas Air.
Oxygen metering by means of emergency O
2 deliv-
ery, O
2 flush or additional O2 delivery lead to an in-
crease in O2 concentration.
Due to the release of nitrogen (N
2) into the system
by the patient, the O2 uptake cannot be balanced in
Uptake mode. This leads to a drop in O
2 concen-
tration. If the inspiratory O2 concentration drops be-
low the O2 set value by a predefined value (de-
pending on the O
2 set value), the Uptake mode is
exited. The fresh-gas flow is automatically in-
creased until the set value for O2 is reached again.
The table below summarizes this control mode:
The oxygen control loop considers a humidity of
7 Vol.% in the breathing system. The maximum
achievable inspiratory oxygen concentration in con-
trol mode is therefore only 93 Vol.%, additionally re-
duced by the anesthetic agent concentration in the
circle system.
Expiratory anesthetic agent concentra-
tion control
The anesthetic agent is supplied as saturated
steam to the breathing system. Circle flow and
minute volume provide for an even mixing of
breathing gas. To achieve the new set value quickly
(T
90-VAINSP typically <120 s, the flow is automati-
cally increased with the increase in the set value of
expiratory anesthetic agent. The T
90 time of expir-
atory anesthetic agent concentration depends on
Insp. O
2 set value Maximum deviation
≤35 Vol.% –3 Vol.%
>35 Vol.% ≤60 Vol.% –5 Vol.%
>60 Vol.% –7 Vol.%
254
Set value Expiratory VA concentration
(set point [Vol.%SL] or [kPa])
Limitation Inspiratory VA concentration
(set point [Vol.%
SL] or [kPa])
Measured values Expiratory VA concentration
measured in terms of released
breath at the Y-piece (actual
value)
Additional meas-
ured values
Inspiratory VA concentration
measured at the Y-piece
End tidal CO
2 value measured
in terms of released breath at
the Y-piece
Minute volume
Control value Measured value smaller than
set value of anesthetic gas flow
[L/min] supplied as saturated
steam to breathing system.
Measured value larger than set
value of mixed gas flow [L/min]
Anesthetic agent
delivery
Patient gas analysis
O
2, agents, CO2
etISO = 2.0 Vol.%
Set value
etISO = 2.0 Vol.%
Exp. valve
Circle flow
Patient
Blower
Vapor
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