28
Quick Reference Guide Primus
Infinity Empowered
SW 4.5n
Principles of Operation
Volume Mode
Volume-controlled ventilation mode with fixed mandato-
ry tidal volume
V
T
and frequency
freq.
(former IPPV), as
well as with optional synchronization activation
(former SIMV(VC)) and variable pressure support for
spontaneous breathing efforts (former SIMV(VC)+PS,
optional).
The respiratory cycle is defined through the frequency
freq.
, the inspiratory time
T
INSP
, the inspiratory pause
time
T
IP
:T
INSP
and the tidal volume
V
T
. Synchronization
and pressure support are controlled by the sensitivity of
the flow trigger and the level of
Δ
P
PS
. The maximum
time interval for controlled ventilation is set via the fre-
quency. In order to maintain a constant frequency, a
time interval triggered prematurely is compensated in
the next cycle.
096
25%
Pressure
Trigger indicator
P
MAX
PEAK
PLAT
Δ
P
PS
Flow
T
IP
T
SLOPE
T
EXP
1/
Freq.
Trigger indicator
Trigger
on
Δ
P
PS
on
Time [s]
Flow trigger
Flow-trigger window
Time [s]
T
INSP