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Facemask
Mouthpiece
Adapter
MicroRint
Cardboard
Mouthpiece
fig 2
The filter provides protection against bacterial and viral cross infection
between subjects. It also protects the resistive element inside the
transducer from contamination. A new filter must be used for each patient
tested.
The MicroRint will measure the total airway resistance of the subject
including any added resistance between the subject and the transducer.
The small resistance of the Micro Medical breathing filter is automatically
subtracted from the measurement. Use only the filter type supplied by
Micro Medical as other types, with different values of resistance, will give
erroneous results. The filter will gradually absorb moisture from the
breath causing its resistance to rise. This rise will be negligible if used for
one subject only, but will give significant errors if re-used on another
subject.
Ensure that the side stream cap is firmly in place blanking off the upper
22mm port. This port is only used when the transducer is used for
measurement of airways flow limitation with negative expiratory pressure
applied and must be sealed when performing an airways resistance test.
Before performing an airways resistance test enter a new patient’s details
to the MicroLab database or retrieve an existing patient – see patient
selection, page 24.
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