
Fabius
®
Function Description
2-36
Cop
yr
ight
2000 Dr
aeger
M
edical,
In
c.
sec2_
funcde
scr
ip_
b.fm
7.2.1
Function Principle of the Pneumatic Control of the Ventilator
The piston pump generates a vacuum required for the bag-type rolling seal and the
rolling seal of the ventilator as well as the control pressure for the PEEP valve. The
spring-loaded non-return valve limits the vacuum to
−
200 hPa (mbar). A pressure
sensor measures the current pressure and converts the pressure value into a
corresponding electrical signal. This signal is transmitted to the microprocessor. The
reservoir V1 "smooths" the flow to the electronic PEEP valve. The combination of filter
and reservoir V2 dampen the noise.
Fig. 28:
Function diagram of the pneumatic control of the ventilator
ventilator
E
P
piston
pump
–200 hPa (mbar)
reservoir V1
electronic
PEEP valve
to the PEEP
valve/ expiratory
valve
filter
reservoir V2
pneumatics
Summary of Contents for Fabius 4116029
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