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MicroGard™ filter

Disposable barrier filter for pulmonary function testing

Independent studies of the MicroGard filter clearly demonstrate that it acts as a barrier to viral and bacterial cross-contamination. 

  • Independent studies also demonstrated that MicroGard’s resistance to inspiratory and expiratory air flow is lower than published recommendations.
  • There are now 3 varieties of MicroGard!
  • MicroGard IIB with oval mouthpiece and assists patients with correct positioning of the teeth and lips (patent pending).
  • And the MicroGard IIC with round mouthpiece for use in combination with separate mouthpiece.
  • The MicroGard™ II is the only filter that has gone through a full verification and validation process together with the medical equipment it is used on. We can guarantee optimum measurement performance of the Vyaire’s JAEGER, SensorMedics™ Vmax and MicroMedical pulmonary instrumentation.
  • Most filtration materials use surface loading as the primary means of removal. With the material used in the MicroGard™ II product, the fibre matrix results in depth loading, where particles are captured throughout the entire filter material, not just on the surface.
  • The filter material is composed of polymer fibres that will not support the growth of mould, mildew, fungus or bacteria.
  • The filter material also is resistant to degradation over time and is able to withstand extreme temperature and humidity.
  • Even with all these advantages, the Vyaire MicroGard filter is still priced competitively.
MicroGardMicroGard IIBMicroGard IIC
DEAD SPACE 50 mL 55 mL 55 mL
Resistance at 1 L/s
INSPIRATORY 0.034 kPa/L/s; 
(0.34 cmH2O/L/s)
(<0.4 cmH2O/L/s)
0.4 <0.04kPa/L/s; 
(<0.4 cmH2O/L/s)
EXPIRATORY 0.025 kPa/L/s; 
(0.25 cmH2O/L/s)
(<0.4 cmH2O/L/s)
0.4 <0.04kPa/L/s; 
(<0.4 cmH2O/L/s)
Filtering Efficiency
VFE* (at 30 LPM) 99.9974% >99.9924% >99.9924%
VFE* (at 750 LPM) >96% >96%
BFE* (at 30 LPM) 99.99944% >99.999% >99.999%
US; International US; International US; International

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