Siemens Servo Ventilator 300, Руководство по обслуживанию

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Servo Ventilator 300/300A Introduction
E382 E380E 061 01 03 01 Siemens-Elema AB 13
1
Gas flow through the patient unit
Inspiratory flow
1.Gas inlet for air. The connected air must
have a pressure between 200 and 650
kPa (2 and 6.5 bar).
2.Gas inlet for O
2
. The connected O
2
must
have a pressure between 200 and 650
kPa (2 and 6.5 bar).
3.The flow of the gas delivered to the
patient system is regulated by the
inspiratory valves. There is one inspira-
tory valve unit (gas module) for each
gas. The inspiratory valves are regulated
by a feedback control system that is
described in this chapter.
4.The gases are mixed in the inspiratory
mixing part.
5.The pressure of the mixed gas delivered
to the patient (inspiratory pressure) is
measured by the inspiratory pressure
transducer. The transducer is protected
by a bacteria filter.
6.The inspiratory pipe leads the mixed gas
from the inspiratory mixing part to the
patient system. The inspiratory pipe also
contains the safety valve, a holder for the
O
2
cell and the inspiratory outlet. The
springloaded safety valve will open in
case of a power failure and/or if the inspi-
ratory pressure exceeds 120 cm H
2
O. It
will also open if the set upper pressure
limit is exceeded by 5 cm H
2
O.
7.The oxygen concentration inside the
inspiratory pipe is measured by the O
2
cell. The O
2
cell is protected by a
bacteria filter.
Expiratory flow
8.The patient system's expiratory gas tube
is connected at the expiratory inlet. The
expiratory inlet also contains a moisture
trap.
9.The gas flow through the expiratory
channel is measured by the expiratory
flow transducer. Patient trigger efforts,
indicated by a decreased continuous
flow, are sensed by this expiratory flow
transducer.
10.The expiratory pressure is measured by
the expiratory pressure transducer. The
transducer is protected by a bacteria
filter. Patient trigger efforts, indicated by
a pressure drop, are sensed by this
expiratory pressure transducer.
11.The pressure of the gas (PEEP pressure)
in the patient system is regulated by the
expiratory valve. The expiratory valve is
regulated by a feedback control system
that is described in this chapter.
12.The gas from the patient system leaves
the ventilator via this expiratory outlet.
The outlet contains a non-return valve
which is a part of the patient triggering
system.