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Fresh-gas control mode
According to common anesthesia systems, in the
FG ctrl. control mode, the mixed gas and the anes-
thetic agent are introduced into the breathing circle
as a fresh gas mixture. In this control mode, mixed-
gas metering devices and anesthetic agent meter-
ing devices emulate the functionality of a vaporizer.
ORC function (Oxygen Ratio Controller)
In the uncontrolled operating modes, the minimum
metered fresh-gas flow is 0.25 L/min STPD (Stand-
ard Temperature Pressure Dry). The set point is
limited so that at least 25 Vol.% O
of at least 250 mL/min (STPD) is delivered.
Gas control loops
During anesthesia, the user must ensure an ade-
quate oxygen supply and sufficient depth of an-
esthesia for the patient. The former is ensured by
setting an inspiratory O
the assurance of sufficient depth of anesthesia, is
achieved by setting the expiratory anesthetic agent
concentration. Zeus IE can be run in normal opera-
tion (Auto control control mode), in a closed circuit
(Uptake mode) or a semi-closed circuit (FGmin
≥0.5 L/min). In both operating modes, the gas con-
centration is controlled in the breathing system (in-
spiratory O
control loop) and the gas concentra-
2
tion exhaled by the patient (expiratory anesthetic
agent (VA) control loop). The O
tions metered in the fresh gas will normally deviate
very substantially from the concentrations in the cir-
cle system.
Instructions for use Zeus Infinity Empowered SW 2.n
and an O
2
2
concentration. The latter,
2
and VA concentra-
2
Anesthetic agent delivery
Anesthetic agent delivery takes place independ-
ently of the carrier gas. The anesthetic agent is sup-
plied to the breathing system and fresh-gas outlet
(optional) through a heated pipe in the form of sat-
urated steam either direct or mixed with the carrier
gas.
It is possible to connect two anesthetic agent me-
tering modules with identical or different anesthetic
agents.
flow
Concentration control loops (Auto con-
trol control mode)
Set values (target values for the control loops) are
the inspiratory oxygen concentration and the expir-
atory anesthetic agent concentration.
A scavenging concentration measurement at the
Y-piece (patient gas analysis) and a second scav-
enging concentration measurement in the inspira-
tion pathway (supervisor gas analysis) deliver
measured values for O
gas.
Patient gas analysis is subjected to further process-
ing for gas monitoring. Secondly, this sensor sup-
plies the actual inspiratory and expiratory values for
the concentration control loops.
In MAN/SPON mode, the gas control loop is not ac-
tive.
Description
, N
O, CO
, and anesthetic
2
2
2
441
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