Dräger Savina 300, Technical Documentation Manual, Page: 22 / 166

N
o
.13
09
_00
00
00
122
7_
Pu
bl
ic
ati
on
22
Savina 300
Function descriptions
Pneumatic assembly
Device functions
Ventilation function When the device is switched on the power supply unit supplies the blower
motor with operating voltage. The blower motor draws in ambient air through
the microfilter F1, the volume and the sound insulators SD1 and SD3. The
blower motor compresses the gas intake to an overpressure up to max. 140
mbar at a delivery rate of up to 180 L/min. The air compressed by the blower
motor passes through the sound insulator SD4, the cooler, the sound insula-
tor SD2, the filter F4 and the inspiratory flow sensor S1 to the inspiratory non-
return valve D4. The controller operates the blower motor during a breath at a
constant speed. The bypass valve regulates the inspiratory pressure. The
combination of the blower motor and bypass valve V1 provides a pressure
source.
Fig. 10 Detail view of functional diagram; ventilation function
The sound insulators SD1 and SD2 on the inlet and outlet sides of the blower
motor reduce the sound level.
The bypass valve V1 is operated such that the desired respiratory pressure is
applied to the blower outlet, and thus to the patient. If the patient needs a high
flow during the inspiratory phase, the gas flows in part or in its entirety from
the blower motor outlet to the patient and the gas flow through the bypass
valve V1 is reduced. During the expiratory phase all the blower gas flows
through the bypass valve V1.
The cooler reduces the respiratory gas temperature down to a permissible
range.