B - Operations – Transporting – 01 – L
Patent
B - Operations, Transporting
01
L
222/2
B01L 3/02 (2006.01)
Patent
CA 1293709
METHODS AND APPARATUS FOR PIPETTING AND/OR TITRATING LIQUIDS USING A HAND HELD SELF-CONTAINED AUTOMATED PIPETTE Abstract of the Disclosure A hand held self-contained automated pipette for portable operation having an electrically operated digital linear actuator is disclosed. The digital linear actuator preferably includes a stepper motor driving a rotor. A threaded screw is coaxially positioned within the rotor and is connected to an actuator shaft having elongate grooves slidable in a guide for preventing act- uator shaft rotation so that precise linear motion is im- parted to the actuator shaft. Provision is made for the removable attachment of pipetting displacement assemblies of various sizes all actuated by a common digital linear actuator including programmed movement of a displacing piston in-a displacement cylinder to optimize air inter- face volume neutralize variations in vacuum pipette ef- fects, and provide an accommodated stroke and readout for improved accuracy while pipetting and/or titrating differ- ent ranges of volumes. A control-circuit is provided so that the back EMF of the stepper motor coils is recircu- lated when power is duty-cycled off for power conservation. Conversely, recirculation is switched-off when power is duty-cycled on for minimizing losses. Recirculation is switched off when coils are commutated which produces a rapid magnetic field collapse for assuring high torque. Upon calibration the displacing piston undertakes imme- diate excursion to an end of travel limit and after motor slippage is retracted to a home position. This home po- sition is chosen for optimum preservation of an air inter- face volume between drawn liquid and the displacing pis- ton tailored with particularity to the displacement as- sembly being used. Multiple precision modes are provided for the convenience of the operator, these modes includ- ing pipetting, multiple-dispensing, titration, and dilu- tion. Other features are also disclosed. RRRRR1/9921-2
474579
Magnussen Haakon T. Jr.
Ruskewicz Stephen J.
Smith Gary L.
Wingo Anthony K.
Fetherstonhaugh & Co.
Rainin Instruments Co. Inc.
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