Theory of operation
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
2-79
2.8 Emergency modes
This section describes how the ventilator operates under several unexpected conditions,
including occlusion cycling mode, a ventilator inoperative (VENT INOP) condition, and when
the ventilator opens the safety valve.
2.8.1 Occlusion cycling mode
If the ventilator detects an occlusion in the ventilator breathing circuit or a continuous high
inspiratory pressure condition (due to an exhalation valve that does not open or an occluded
flow sensor), it opens the safety and exhalation valves to vent excess pressure, then shuts
them and begins
occlusion cycling mode
. In occlusion cycling mode the ventilator uses current
settings except for the following, if applicable (Table 2-3):
Table 2-3: Changes to current settings in occlusion cycling mode
Setting
Change to setting in occlusion cycling mode
% O
2
(all modes)
Set to 100%.
PEEP (all modes)
Set to 0 cmH
2
O.
RISE TIME FACTOR (A/C PCV, SIMV
PCV, and SPONT PSV, 760
Ventilator only)
Set to 70.
SPONT mode
Patient-initiated breath triggering disabled, PSV breaths
delivered at a rate of 12/min with an inspiratory time of 2
seconds.
INSPIRATORY PRESSURE (A/C PCV
and SIMV PCV)
If less than 15 cmH
2
O: set to 15 cmH
2
O.
If 15 cmH
2
O or above: the current setting is used (no change).
SUPPORT PRESSURE (SPONT PSV)
If less than 15 cmH
2
O: set to 15 cmH
2
O.
If 15 cmH
2
O or above: the current setting is used (no change).
HIGH PRESSURE alarm (A/C VCV)
If greater than 30 cmH
2
O: set to 30 cmH
2
O.
If 30 cmH
2
O or less: the current setting is used (no change).
HIGH PRESSURE alarm (A/C PCV)
Set to INSPIRATORY PRESSURE (as adjusted for occlusion
cycling mode) + 20 cmH
2
O, up to a maximum of 90 cmH
2
O.
HIGH PRESSURE alarm (SIMV VCV)
If greater than 30 cmH
2
O, set to whichever is greater:
•
30 cmH
2
O, or
•
SUPPORT PR 2 cmH
2
O
If 30 cmH
2
O or less, set to whichever is greater:
•
the current setting (no change), or
•
SUPPORT PR 2 cmH
2
O.
HIGH PRESSURE alarm (SIMV PCV)
Set to whichever is greater:
•
INSPIRATORY PRESSURE (as adjusted for occlusion cycling
mode) + 20 cmH
2
O, up to a maximum of 90 cmH
2
O, or
•
SUPPORT PR 2 cmH
2
O.
Содержание Puritan Bennett 700 Series
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