Dräger Medical Savina, Руководство пользователя

Страница: 26 / 92

For
in
ternal use only
. C
opyr
ig
ht reserved.
V
e
rsi
o
n
3
.0_
R
e
le
ased
_P
ri
n
ted
on
_0
4.0
1.0
6
_
F
5
6
6
4
9
00T0
1IE
C
.fm
20
5664.900
Function Description Savina
The expiratory valve has two functions:
– Controls the PEEP during expiration
– Closes the breathing system during inspiration
2.3.2 O2 mixture with O2 high
pressure In order to be able to ventilate with an increased O2 concentration, the unit
must be supplied with 2.7 to 6.0 bar O2. O2 is filtered via the intake filter F2.
With the aid of a digital valve bank consisting of 8 digital solenoid valves, O2
is metered into a volume (mixing chamber). The amount of metered O2
depends on the pre-set O2 concentration and on the inspiratory flow rate
measured by the flow sensor S1. The addition of O2 is regulated in a closed
loop. In the process, the inspiratory O2 concentration is measured by the O2
sensor S 3.1.
2.3.3 O2 mixture with O2 low
pressure (optional
“LPO”)
An O2 low pressure source without humidifier feeds the oxygen into the
“LPO” connection on the back of the unit. The filter (filter element) F5 protects
the non-return valve D6 from coarse particles. The oxygen flows from the
non-return valve D6 into the volume (mixing chamber). In the volume (mixing
chamber) it is mixed with the fresh air drawn in through the Filter F1.
When no O2 low pressure source is connected to the unit, the non-return
valve D6 prevents gas from escaping during normal operation.
2.3.4 Pneumatic safety
devices The independent pneumatic safety valve D1 ensures that the ventilation pres-
sure can never rise above the legally prescribed limit of 120 mbar. In the
event of inspiratory stenosis the pressure is limited by opening the expiratory
valve. The mechanical negative-pressure valve D2 ensures (except in the
case of inspiratory stenosis) that the patient can breathe spontaneously from
the ambient air in case of a fault.
The emergency vent valve V9 relieves the pressure in the breathing system
in a case of expiratory stenosis if the pressure cannot be relieved through the
expiratory valve. The pilot valve V8 operates the emergency vent valve V9.
2.3.5 Nebulizer function The medicament nebuliser is operated with 100% O2. The supply pressure
regulator DR1 ensures, with widely varying supply pressure (2.7 to 6.0 bar),
that the pneumatic medicament nebuliser receives a constant supply pres-
sure of 2.0 bar.
When the nebulizer function is active the solenoid valve V5 operates in an
“inspiration” (open position) and “expiration” (closed position) cycle. When
the nebulizer function is inactive valve V5 is permanently closed.
Connect only O2 low pressure sources without humidifier to the Sav-
ina!
In “LPO” mode, the valve bank in the O2 supply is not actuated.