Patent ID: 7773206

Claim:
A flow-through tank ( 300 ) for an optical device ( 120 ) for counting and/or differentiation of leucocytes in an automatic blood analysis apparatus ( 20 ), comprising: a tank body ( 301 ); an injector ( 302 ) arranged approximately coaxially with the tank body ( 301 ) along an injection axis (X 300 ) for injecting a sample flow ( 311 ); an analysis zone ( 304 ) connected to the tank body and arranged downstream from the injector ( 302 ) having a section with at least one transverse dimension between 1 and 5 millimeters; and means ( 301 ) for forming a sleeving flow around the sample flow, said sample flow being injected under pressure relative to the sleeving flow, the sleeving flow being passive in that the sleeving flow does not stretch the sample flow.