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Instructions: Meditech
microVENT
Page 20 of 28
Part number 011-0045-00
DOC300M
17/03/2021
Issue L
4.4 USE IN TOXIC ATMOSPHERES
4.4.1 During ventilation in atmospheres containing smoke, water or toxic gas, the Anti-Air-Inhalation
Diaphragm (Fig:6,t3) should be fitted to the Patient Valve. This Diaphragm helps ensure that
the patient can receive only pure oxygen during ventilation. Anti-Air-Inhalation is achieved by
fitting a simple removable diaphragm onto the Patient Valve.
WARNING
The
microVENT
Airmix when set at 50% entrains gases from the atmosphere when
operating and should not be used in contaminated environments. On Airmix models set
the Airmix control to the 100% position (Airmix off).
4.5 USE IN CLEAN ATMOSPHERES
4.5.1 When the Anti-Air-Inhalation-Diaphragm (Fig:6,t3) is fitted and the microVENT is being used
on a patient, if the oxygen supply runs out the patient will not be able to breath ambient air
spontaneously through the Microvent.
WARNING
The patient cannot breathe ambient air when the Anti-Air-Inhalation Diaphragm is fitted,
continued use of the anti-air-inhalation diaphragm on an advanced model Microvent will allow
the patient to inhale 100% oxygen if an inspiratory effort is made by the patient. The anti-air-
inhalation diaphragm is not recommended for use on a standard model microVENT. The
standard model microVENT is not principally designed for use in a toxic environment however
if a standard model microVENT is used in a toxic environment for reasons of emergency and
has the anti-air-inhalation diaphragm fitted it is essential that the diaphragm is removed as
soon as possible when the patient is moved to a safe non-toxic environment. If an anti-air-
inhalation diaphragm is used with a standard model microVENT, which is not recommended by
the manufacturer risks associated with use of the device will increase.