Table of Contents - Covidien

Breath delivery
• the set I:E RATIO is reached or inspiratory time has elapsed
(PCV breaths).
The ventilator delivers a VIM breath at the preset respiratory rate.
The ventilator delivers a PIM breath if it detects a patient effort, as
defined by the TRIGGER SENSITIVITY setting. The ventilator delivers
an OIM breath if the operator presses MANUAL INSP.
D.2 SPONT mode
During SPONT mode, the ventilator delivers spontaneous breaths.
Pressure support ventilation (PSV) is available in SPONT. In PSV the
ventilator augments the patient’s inspiratory effort to sustain the set
level of SUPPORT PRESSURE. On the 760 Ventilator only, the RISE TIME
FACTOR setting determines how quickly the target pressure is
achieved, and the EXH SENSITIVITY setting determines the point at
which the breath cycles to exhalation. When the inspiratory phase of a
PSV breath terminates, the exhalation valve opens and pressure falls
to the set level of PEEP/CPAP. The patient triggers all spontaneous
breaths, and influences their inspiratory flow, inspiratory time, and
tidal volume.
The ventilator normally terminates the inspiratory phase of a PSV
breath when:
• inspiratory flow drops to 10 L/min or 25% of peak flow, whichever
is less (740 Ventilator), or when the inspiratory flow is less than the
set value of EXH SENSITIVITY (760 Ventilator), or
• patient wye pressure exceeds the set inspiratory pressure
(Pi + PEEP) by more than 3 cmH2O (3 hPa), or
• inspiratory time exceeds 3.5 seconds (2.5 seconds for pediatric
ventilator breathing circuits).
The ventilator delivers an OIM breath during SPONT when an operator
presses MANUAL INSP. OIM breaths delivered during SPONT are based
on the apnea settings.
D-4 10066984 Rev. D 700 Series Ventilator Operator’s Manual