FILTRATION SYSTEM AND METHOD FOR OBTAINING A CYTOLOGY LAYER

摘要

A filter assembly for separating and collecting a layer of particulate matte r (e.g., cells) from a liquid containing the particulate matter (e.g., a biological fluid specimen). The filter assembly has a holder and contiguous inner and outer fluid pervious media. The outer fluid pervious medium is attached to the sidewall of the holder. The inner fluid pervious medium is o f low fluidic impedance relative to the outer fluid pervious medium. The filte r assembly is designed for use in a separation housing that defines two flow paths between inlet and outlet, one directly through the filter and the othe r around the periphery of the filter. The inlet portion of the housing has a central inlet in a radially sloped surface that faces the filter collection site. A movable suction head is adapted to cooperate with the housing and th e filter assembly.