Instructions for use | Atlan A100 (XL), A300 (XL), A350 (XL) SW 2.1n 319
Principles of operation
This principle of operation enables the following characteristics, for example:
– Precise application of the set tidal volume, regardless of the inspiratory and
expiratory flow measurement.
– No drive gas is required, i.e., no medical gases are consumed in operating the
ventilator.
– Mechanical ventilation remains available if the gas supply fails, see page 54.
16.3.2 Detection of condensed water
This device has a humidity detection function to detect condensed water during the
system test and the leakage test.
Condensed water can occur in two typical locations.
– Piston diaphragm
– Breathing circuit
The test for water in the piston diaphragm is performed by moving the piston to the
top position. If a significant amount of water is present in the piston diaphragm, this
water drains off and is detected by the inspiratory flow sensor.
To test for water in the breathing circuit, the piston generates a steady air flow. If a
significant amount of water is present in the breathing circuit, this leads to pressure
fluctuations. These pressure fluctuations are detected by the pressure sensors.
16.3.3 Fresh-gas decoupling
In certain ventilation situations with anesthesia machines, operation of the O2 flush
can lead to undesired pressure fluctuations at the patient port, particularly if the
breathing hoses have small volumes.
This device is equipped with a fresh-gas decoupling function. This function is
particularly important during the ventilation of neonates and pediatric patients, as
airway pressures and tidal volumes that are too high are thus avoided.
The function decouples the mechanical ventilation from the fresh-gas flow and the
O
2 flush. Consequently, changes to the fresh-gas flow and operation of the O2 flush
have no influence on the applied tidal volume and the ventilation pressures.
Furthermore, the fresh-gas decoupling valve passes excess fresh gas to the
breathing bag.
Proceed as follows for a better understanding of the device behavior with the fresh-
gas decoupling function:
1. Connect the breathing circuit to the device.
2. Fit the Y-piece on the circuit plug of the breathing system.
3. Start a ventilation mode. Observe the measured waveforms on the screen.
4. Press the O
2 flush for at least 5 seconds. Observe the effect on the applied tidal
volume and ventilation pressures.
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