Particle counting apparatus utilizing various fluid resistors to maintain proper pressure differentials

摘要

Apparatus and a method therefor for counting platelets and red blood cells in a whole blood sample includes an aperture type transducer having front sheath and back sheath flows but also including various fluid resistors to maintan proper pressure differentials and which are driven from a common air supply. The whole blood sample is injected through the aperture by use of a small bore tube also driven by the common air supply.