Dräger Babylog 8000 plus Instructions For Use Manual page 154

Principles of operation
Description of the pneumatic mode of
operation
Gas supply
The compressed gases Air and O
via the filters (A) and non-return valves (B) to the
pressure regulators (C), which generate constant
pressure for both gases. The non-return valves (B)
prevent the gas from flowing back into the central
gas supply.
The absolute pressure absorbers (D) measure and
monitor system pressure. Air and O
after the pressure regulators (C) and directed to
the magnetic valve (G), which directs control air or
calibration gas through the magnetic valve (H) to
the magnetic valves (I) and (W), to the safety valve
(P), to the PEEP control valve (R), and to the
expiration valve (T). Both gases are directed from
the pressure regulators (C) to the magnetic valves
(E) and metering systems (F), which mix and
meter both gases. The gas mixture flows via the
inspiratory line to the patient.
In the event that the gas supply fails, ambient air
can be drawn in through the filter (K) and the non-
return valve (J). The non-return valve (J) prevents
breathing gas from escaping into the environment.
Controlled ventilation
The continuous flow flows via the inspiratory line to
the Y-piece.
The inspiratory oxygen concentration is measured
at the O sensor (N) by the open pneumatic control
2
valve (L).
The safety valve (P) is opened if a detected
stenosis impedes depressurization in the
expiratory branch.
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Inspiration
The expiratory valve (T) is activated by the PEEP
control valve (R) and closes the expiratory line.
The continuous flow flows into the patient's lungs.
The airway pressure is measured with the two
are delivered
2
relative pressure absorbers (Q) and (V). The
inspiratory pressure limitation is regulated via the
expiratory valve (T).
Expiration
The PEEP control valve (R) vents the control
pressure at the expiratory valve (T). The expiratory
is diverted
2
valve opens the breathing system. The breath is
expired via the open expiratory valve (T). The
ejector (X) is activated by the open magnetic valve
(W) and supports expiration.
PEEP
The PEEP control valve (R) generates a control
pressure, which regulates the PEEP in the
breathing system, on the control side of the
expiratory valve (T).
CPAP
The control pressure generated by the PEEP
control valve (R) affects the control side of the
expiratory valve (T) and produces a continuous
positive airway pressure in the breathing system.
The continuous flow flows via the Y-piece and
expiratory valve (T).
Instructions for use Babylog 8000 plus SW 5.n