Bayer Corporation

Miles Inc.

David L Boger

Ralph G Priddy

James F Caruso

Bryce Rutter

William E Bigler

Lester W Doyle

Kenneth D Collister

Joseph E Perry

Cynthia S Postma

Robert L Terry

Raymond M Werner

Doraiswami Jaichandra

Brian D Moore

Todd O Buck

Donald L Jaworski

Douglas E Foos

Alex L Litwin

A fluid sensing pipette includes an outer conductive tube forming a first electrode and an inner conductive tube forming a second electrode. The inner conductive tube is disposed concentrically within the outer conductive tube. To insulate the inner conductive tube from the outer conductive tube, the inner conductive tube is coated with a thin, uniform, and consistent Parylene coating. A hydrophobic polymeric tube is disposed concentrically within the inner conductive tube to prevent cross-contamination between different biological samples aspirated into the pipette. The inner and outer conductive tubes are separately coupled to a level detection circuit which permits the pipette to detect entry of the pipette into a conductive fluid. The level detection circuit determines the impedance between the first and second electrodes and produces a control signal in response to the impedance falling below a predetermined threshold. A hydrophobic polymeric plug is disposed between the inner conductive tube and the polymeric tube in close proximity to a distal end of the polymeric tube so as to prevent fluid from entering between the inner conductive tube and the polymeric tube.

Fluid sensing pipette

Sample tray

Urine analyzer

Reagent format storage case

Growing community of inventors

Mishawaka, IN, United States of America

David L Boger