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Precision pumping device

  • US 6,234,771 B1
  • Filed: 05/28/1999
  • Issued: 05/22/2001
  • Est. Priority Date: 06/02/1998
  • Status: Expired due to Term
First Claim
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1. A precision pumping device comprising:

  • a housing including an integral anti-rotation guide;

    a first chamber removably coupled to said housing;

    a first piston displaceable within a portion of said chamber, said first piston and said first chamber adapted to aspirate or dispense a first volume of fluid;

    a port disposed within said chamber, said port providing fluid communication from within said chamber to outside of said chamber;

    a fine pitch lead screw;

    a coupling fixedly linking said piston to said leadscrew;

    an anti-rotation member projecting from said coupling and into said anti-rotation guide;

    a split hub clamp nut coupled to said leadscrew; and

    a stepper motor attached to said housing, said stepper motor coupled to said leadscrew and operative to move said leadscrew in a first direction for moving said piston within said chamber to dispense a first volume of fluid within said chamber out of said port, said stepper motor operative to move said leadscrew in a second direction for moving said piston within said chamber to aspirate a first volume of fluid into said chamber through said port.

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