Description
444
Instructions for use Zeus Infinity Empowered SW 2.n
minute volume). An excess of 15 % versus the ex-
piratory set value is allowed. The scavenging of ex-
cess anesthetic agent starts when this limit value is
exceeded. To scavenge the excess anesthetic gas
(T
90 VAINSP typically <120 s), anesthetic gas flow is
stopped and the fresh-gas flow is increased if the
anesthetic gas set value decreases.
Expiratory anesthetic agent control is limited by a
two-phase inspiratory limit. The level of the first limit
(Prime Dose) is adjusted by the user inVAmax. The
maximum allowed level of Prime Dose is depend-
ent on the anesthetic agent used.
Prime Dose is only enabled if the expiratory anes-
thetic gas set point is increased by more than 20 %
in relation to the current value. The difference be-
tween the expiratory anesthetic gas set value and
measured inspiratory VA concentration must be
greater than 0.5 MAC. Prime Dose is only then en-
abled if a major change in expiratory set value is
performed.
If the patient has already been subjected to induc-
tion, the Prime Dose is prevented from becoming
active at the same time.
The second stage is a fixed limit for the Steady
State Dose. The level of the Steady State Dose is
dependent on the anesthetic agent used.
Restrictions to the metering of anes-
thetic agent concentration
The maximum anesthetic agent quantity delivered
by the anesthetic agent metering system is limited
(1.0 L/min vapor for isoflurane and sevoflurane as
well as 1.5 L/min vapor for desflurane). The set
concentration or the set partial pressure is no
longer achieved with large fresh-gas flows.
Flush phases
If an anesthetic agent mixture consisting of several
different anesthetic gases is detected by the patient
gas analyzer, normal operation is stopped. If the
concentration of the anesthetic gases metered first
is too high that it can still be identified, the device
switches to HighFlow operation (flow >12 L/min).
Regular flush phases during normal operation must
prevent the uptake of foreign gases. In contrast to
HighFlow operation, the control loops (O
2 and an-
esthetic agent) remain active during the flush
phase. Only the rate of mixed gas flow is increased.
The flush flow rate is 12 L/min.
256
Steady
AGas uptake
"Prime Dose" in
inDes
etDES
inDESmax
inDes Set
Time (seconds)
Vol.%
Anesthetic gas
inDESmax
Duration Prime Dose
3 min for isoflurane, sevoflurane and desflu-
rane
Level of the Steady State Dose
1.0
Vol.%
for isoflurane, sevoflurane
2.0
Vol.%
for desflurane
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