Accessories
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Attaching a Heat Moisture Exchange (HME)
HME's are passive humidification systems that retain heat and moisture from the patient's exhaled
gases via an internal membrane. An HME should not be used with active humidification. An HME can
be used with the Astral device with a double limb circuit or single limb circuit with integrated valve.
WARNING
Only use HMEs that comply with the relevant safety standards, including ISO 9360-1 and
ISO 9360-2.
Place the HME between the patient end of the circuit and the patient interface.
Do not connect patient interfaces prior to performing the Learn Circuit. Patient interfaces include any
components placed after the single circuit's expiratory valve or exhalation port, or double limb circuit's 'Y'
piece (eg, HMEF, catheter mount, mask, tracheostomy tube).
Attaching an antibacterial filter
WARNING
Regularly check the antibacterial filter and expiratory valve for signs of moisture or other
contaminants, particularly during nebulisation or humidification. Failure to do so could result
in increased breathing system resistance and/or inaccuracies in expired gas measurement.
• Only use antibacterial filters that comply with the relevant safety standards, including
ISO 23328-1 and ISO 23328-2.
CAUTION
The antibacterial filter must be used and replaced according to the manufacturer's specifications.
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