Page 11
2. What’s New in version 5
2.1 TTV
plus
mode
The TTV
plus
algorithm mode has been modified to
provide a more stable volume delivery.
2.2 TTV
plus
volume alarm threshold
changes
Instead of auto tracking Vte alarms setting, above
and below the set Vte by ±3ml, the auto tracking low
tidal volume alarm will track to 10% or 1 ml below
the set Vte (whichever is lower) and the high tidal
volume alarm will track to 30% or 3ml above the set
Vte (whichever is higher).
The high and low minute volume alarms will now be
auto tracking as follows. The low minute volume
alarm shall be set to 50% below the VTE x BPM or
VTE x Backup breath rate, depending on the mode.
The high minute volume alarm shall be set to 200%
above the VTE x BPM or VTE x Backup breath rate,
depending on the mode.
When TTV
plus
is exited, the alarms shall reset to
their defaults.
See 14.2.2 & 14.2.3 on page 74.
2.2.1 Ti & Max Ti
When turning on the TTV function the Ti control no
longer changes to Max Ti.
2.3 Discontinuing TTV
plus
When switching from a mode with TTV
plus
set to ON
to a mode that does not support TTV
plus
(HFO &
HFO+CMV), or when the user turns OFF TTV
plus
the
ventilator sets the PIP level to the last used PIP
level from the MAX PIP control (This is not the set
MAX PIP) with a minimum of 5 mbar above the set
PEEP. The user should ensure the PIP is set
correctly and adjust if required.
The ventilator will display the following message
after discontinuing TTV
plus:
“TTV has been turned
OFF. Ensure PIP is set appropriately”.
2.4 Leak compensation
The leak compensation is automatically applied and
the leak compensation control is no longer present.
The algorithm will now compensate for leaks up to
50%.
2.5 Cycle fail alarm with flow sensor
connected
The pressure waveform will display the cycle fail
alarm threshold in all conventional modes. The
cycle fail alarm threshold will not be displayed when
the TTV
plus
function has been turned on, but the
cycle fail alarm is still active (See “Cycle Fail Alarm
Threshold” on page 74 for more information).
2.6 Apnoea alarm active threshold
reduction from 20BPM to 10BPM
The Apnoea Setup button will become active (in
SIMV, PTV and PSV modes) when the breath rate is
set below 10BPM, this was 20BPM in version 4.3
software.
2.7 Pressure and Flow waveform option
A new option in the Graph panel (Flow Real Time
button) has been added. Selection of the option will
display Pressure and Flow waveform windows only.
2.8 Variable I:E ratio in HFO ventilation
The user now has the ability to select the following
I:E ratios. 1:1, 1:2 & 1:3.
2.9 HFO mean control increased to 45
mbar
The upper range of the settable HFO mean has
been increased from 35 mbar to 45 mbar.
2.10 Ability to set the Delta P in preview
mode
2.10.1 HFO only
The user now has the ability to change the Delta P
up to a maximum of twice the set mean in preview
mode. In preview mode the mean is limited to 18
mbar which means that the maximum Delta P that
can be set is 36 mbar. The above statement is only
applicable for the preview mode.
If the mean is adjusted down then the Delta P will be
automatically reduced as appropriate. The Delta P
starting default value is 4 mbar.
2.10.2 HFO+CMV
The same shall apply when previewing HFO+CMV
mode. In HFO+CMV mode there is no mean control,
the Delta P shall be adjustable up to twice the set
PEEP. In preview mode the full PEEP setting of 20
mbar can be set which means that the maximum
Delta P that can be set is 40 mbar.
Note: For PSV the inspiratory time control is
always marked Max Ti irrespective of TTV
being ON or OFF.
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