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Description of functions
Expiratory section
Functional Main Blocks diagram marking: "E"
The main block E
XPIRATORY
breathing gas from the patient breathing system to
the E
O
XPIRATORY
UTLET
• Measurement of expiratory flow
• Connection for measurement of expiratory
pressure.
• Controlling element for the regulation of expiratory
pressure.
Expiratory cassette
3
The expiratory gas conveying parts and PC 1786
E
C
C
XPIRATORY
HANNEL
part – the E
XPIRATORY
removed for cleaning or exchange. See Servo...
Ventilator System – User's manual.
The expiratory cassette can be interchanged between
different Servo... systems. Always perform a Pre-use
check after exchanging the expiratory cassette.
An ID PROM is integrated into each expiratory
cassette. Its ID information and remaining lifetime can
be read by the Servo... System.
Ultrasonic
transducer
Heating
foil
Expiratory inlet
22 mm / 10 mm tube connector for the expiratory
tube of the patient breathing system. The inlet is
designed to make condensed water drip out and
allow use of a water trap for such water to be
collected. Expiratory inlet bacteria filter can be
connected to protect the cassette from contamination.
3 - 6
S
conveys the
ECTION
. It comprises:
are integrated into one
ASSETTE
C
– which can be easily
ASSETTE
PC 1786
Expiratory
Ultrasonic
channel cassette
transducer
Bacteria
Expiratory pressure
filter
tube connector
Heating foil
An electrical H
EATING
expiratory pipe where the U
situated. The purpose of the H
condensation and maintain a stable temperature in
the expiratory gas.
Ultrasonic flowmeter
The U
F
LTRASONIC
the expiratory gas flow, using ultrasound technique
with two ultrasonic transducers/recievers.
The measuring process is controlled from the main
block PC 1784 E
The left hand side transducer is sending out ultrasonic
sound that is reflected against the inner wall of the
expiratory channel. The ultrasonic sound is recieved
by the right hand side transducer now acting as a
reciever. The time from sending to recieving
ultrasonic sound in downstream expiratory gas flow is
measured.
Then the right hand side transducer (earlier recieving)
is sending out ultrasonic sound upstream the
expiratory gas flow. The ultrasonic sound is recieved
by the left hand side transducer now acting as a
reciever. The time from sending to recieving
ultrasonic sound in upstream expiratory gas flow is
measured.
The time difference between the downstream and
the upstream time measurements provides flow
information.
A temperature sensor inside the cassette measures
the expiratory gas temperature. This temperature
measurement is also used when calculating the
expiratory flow.
Siemens-Elema AB
F
applied on the outside of the
OIL
F
LTRASONIC
LOWMETER
F
to reduce
EATING
OIL
is a measuring device for
LOWMETER
C
.
XPIRATORY
HANNEL
E382 E407E 061 01 01 02
Servo...
is
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