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18.3.8 How often does the exhalation block and silencer need to be autoclaved?
Both the exhalation block and the silencer need autoclaving after each patient. The
silencer can be autoclaved up to 25 times. Thereafter the plastic ends may
become brittle and crack.
18.3.9 How do I clean the exhalation block and scavenging system after using NO?
All patient circuitry must be single use. This includes the bifurcated hose assembly.
The scavenging filters may be used until the soda lime granules turn from pink to
a brownish colour and then they must be replaced. The exhalation block must be
rinsed before being sent for autoclaving. Deposits of NO and
NO
2
may have built up during use. During steam autoclaving these deposits, due
to the combination of the deposits and steam, will form nitrous oxide. This in turn
will eat into the metal of the exhalation block leaving “rust” like markings.
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