THREE-CASCADE IMPACTOR DEVICE FOR SAMPLING MICROBIAL AEROSOLS Russian patent published in 2004 - IPC

FIELD: medical engineering.

SUBSTANCE: device has single or several impaction cascades as detachable ring-shaped collectors having ring-shaped notch. Upper part of axial opening restricted by internal collector wall is used as inlet tube covered with multi-nozzle grill with Petri dish filled with dense culturing medium set under the grille coaxial with ring-shaped collector center. The lower inlet opening is used as inlet opening and rarefaction source collector of centrifugal fan. Values of d₅₀ characterizing aerosol sedimentation completeness by particle sizes selected for impactor cascades with efficiency of 50% are equal to I-d₅₀ =4.0, II-d₅₀ =2.1, III-d₅₀ =1.05 mcm. They enable concentration and fineness control option and microbial aerosol fractions separation on cascades showing characteristic properties in acting upon human organism relative to coarse, respiratory and fine one.

EFFECT: enhanced effectiveness in control concentration and fineness and fraction dispersion composition of microbial aerosols under various conditions.

4 cl, 4 dwg