Lysis reagents, cartridges and automated electronic cell counters for simultaneous counting of different types of white blood cells

摘要

A particle characterization apparatus in which particles suspended in a liquid pass through an orifice or aperture for detection and characterization of the particles utilizing impedance determination. In particular, the apparatus includes a membrane of a polymer as a base material for precision machining of a sub-millimeter orifice. Forming the orifice in a polymer membrane facilitates the construction of a single use cartridge for haematology analysis due to low material and production costs.