Assembling patient circuits
24
Fitting the circuit adapter
Before connecting the patient circuit, the adapter specific to the required circuit type must be fitted.
To fit the adapter:
1. Turn over the device and place on a soft surface (to protect the LCD screen).
2. Press and hold the eject button. Pull the cover out towards you.
3. Lift the adapter out of the socket.
4. Replace with the new adapter, ensuring it sits firmly in the socket.
5. Place the cover over the enclosure, ensuring the runners on the device and the cover are aligned.
Slide the cover back into place until the latch clicks.
Connecting a single limb circuit with intentional leak
An intentional leak may be provided in-line using the ResMed Leak Valve or via an integrated mask vent.
When using a circuit with intentional leak, estimation of the patient respiratory flow is enhanced by
ResMed's automatic leak management feature Vsync. Vsync technology allows the device to estimate
the patient respiratory flow and tidal volume in the presence of unintentional leak.
WARNING
• At low pressures, the flow through the mask vents may be inadequate to clear all exhaled
gases, and some rebreathing may occur when using a single limb circuit with intentional leak.
• Ensure the vent holes at the mask or at the ResMed Leak Valve are unobstructed. Ensure the
area around the vent holes is clear of bedding, clothes, or other objects and that the vents
holes are not directed towards the patient.
To connect a single limb circuit with intentional leak:
1. Check the device is fitted with the single limb leak adapter. Otherwise, change the adapter.
Note: The Astral 150 can also support a single limb circuit with intentional leak using a double limb adapter.
2. Connect the inspiratory limb to the inspiratory port.
3. Attach any required circuit accessories (eg, humidifier or filter).
4. Select the circuit type and perform a Learn Circuit.
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