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Function Description Savina Version 2.0
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
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.
The expiratory valve has two functions:
−
Controls the PEEP during expiration
−
Closes the breathing system during inspiration
In order to be able to ventilate with an increased O
2
concentration, the unit must be supplied with
2.7 to 6.0 bar O
2
. O
2
is filtered via the intake filter F2. With the aid of a digital valve block consisting
of 8 digital solenoid valves, O
2
is supplied to a mixing chamber. The amount of supplied O
depends on the pre-set O
2
concentration and on the inspiratory flow rate measured by the flow
sensor S1. The addition of O
2
is regulated in a closed loop. In the process, the inspiratory O
concentration is measured by the O
2
sensor S 3.1.
