Dräger Medical Savina, Manual

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Savina Function Description
The pneumatic system comprises the following principal components (see
also
Figure 9 ): Pneumatic diagram):
– Plug-in unit
– Valve block
– Inspiratory block
– Pressure measuring unit
– Patient system
– Flow sensors
The following summary describes the functions of the various principal com-
ponents rather than giving a detailed description of the components them-
selves.
2.3.1 Ventilation function The blower draws ambient air through an ambient air filter F1 into a mixing
chamber. The blower compresses the gas to a positive pressure of max.140
mbar at a flow rate of up to 180 L/min. The blower is run at constant rotation
speed - that is, the speed is not varied in the course of a breath. The inspira-
tory pressure is regulated by means of the bypass valve. The combination of
the blower and the bypass valve function thus represents a pressure source.
On the inlet and outlet sides of the blower there are mufflers SD1 and SD2,
which reduce the sound level of the blower.
The bypass valve V1 is operated such that the desired respiratory pressure is
applied to the blower outlet, and thus to the patient. In the inspiratory phase
when a high flow rate is required by the patient, part or all of the gas flows
from the blower outlet to the patient; the gas flow in the return line is reduced.
In the expiratory phase the entirety of the blower gas flows via the return line.
A cooler reduces the respiratory gas temperature down to a permissible
range. A fan blows cooling air onto the surface of the cooler to dissipate the
heat from the cooler.
Expiration occurs via a directly operated valve V3.
D3 Expiratory non-return valve
D4 Inspiratory non-return valve
D5 Flush-flow non-return valve
D6 Oxygen connection non-return valve (1)
R1 Flush flow restrictor (0.1 L/min at 30 mbar)
R2 O2 calibration restrictor (0.1 L/min, integrated in valve
block)
R3 Restrictor for O2 measurement (0.2 L/min at 30 mbar, sen-
sor 3.1)
R4 Restrictor for nebulizer (10 L/min, integrated in valve block)
R5.1 - R5.8 Restrictors for oxygen flow control
R6 Restrictor for O2 measurement (0.2 L/min at 30 mbar, sen-
sor 3.2)
Pos. no. Designation