Siemens Servo Ventilator 300 - Page 58

56 Siemens-Elema AB E382 E380E 061 01 03 01
Description of functions Servo Ventilator 300/300A
2
Explanation of Start and Stop conditions;
Front panel setting on which it depends:
Start conditions
(B) Front panel initiation of a breath during
EXP. time;
Start breath
(D) Patient initiation of On demand flow
during INSP. time:
P
E
< (PEEP – 2 cm H
2
O);
Preset PEEP
(M) Ventilator start of a mandatory breath
during SIMV Modes: The first part of
each SIMV cycle is a waiting period - the
SIMV period. If no (P) occurs during a
SIMV period, (M) occurs at the end of
the SIMV period;
Preset SIMV frequency and preset CMV
frequency
(P) Patient trigger during EXP. time (see 6.2);
Preset Trigger sensitivity Level below
PEEP
(S) Mode change from any other mode to
this mode;
Mode selector
(T) During normal procedure (as described
in 6.1.1) if at the end of inspiration the
measured Insp. tidal volume < 50% x
preset Insp. tidal volume (Further details
in 6.1.1, PRVC and VS mode.);
Preset Insp. tidal vol.
(V) Ventilator start of a breath; (V) occurs
each time the internal respiratory CLOCK
signal has emitted 100 clock pulses
since last start of inspiration time;
Preset CMV frequency.
Stop conditions
(0) Ventilator stop insp.;
Time duration since last start insp. =
= (Preset insp. time %) x 1/100 x Breath
cycle
Preset Insp. time % and
preset CMV frequency
(1) INSP. FLOW < 5% x Peak INSP. FLOW during
same inspiration
(2) INSP. FLOW < 25% x Peak INSP. FLOW during
same inspiration and
P
E
> (PEEP + Pressure support level
above PEEP + 8 cm H
2
O);
Preset PEEP and preset Pressure
Support Level above PEEP
(3) P
E
or P
I
> Upper pressure limit;
Preset Upper pressure limit
(4) P
I
> (PEEP + Pressure ... level above
PEEP + 20 cm H
2
O);
Preset PEEP and preset Pressure
(Control or Support) Level above PEEP.
(5) Duration of INSP. TIME > 80% x Breath
cycle;
Preset CMV frequency
(6) (Duration of the time when INSP. FLOW <
25% x Peak INSP. FLOW during same
inspiration) > (Duration of the time when
INSP. FLOW > 25% x Peak INSP. FLOW during
same inspiration)
(7) INSP. FLOW < Preset Insp. flow;
Preset Insp. flow
(8) Measured Insp. tidal volume >
100% x Preset Insp. tidal volume;
Preset Insp. tidal vol.