Precision pumping device
First Claim
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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0 Petitions
Accused Products
Abstract
A precision pumping device for aspirating and dispensing different volumes of fluid is presented. The precision pumping device comprises a housing with integral anti-rotation guides, a stepper motor which drives a fine pitch lead screw, a coupling for linking the piston to the leadscrew, an anti-backlash leadscrew follower, a split hub clamp nut, and a nut for securing the chamber to the housing. A seal is provided which seals around the piston and against the chamber, as is an o-ring that is set into a groove in the chamber and seals against a flange of the seal. The precision pumping device further includes a piston and a chamber for receiving at least a portion of the piston therein. The piston and chamber are of different sizes for aspirating and dispensing different volumes of fluid. The chamber can include a single port or multiple ports. Due to the self-aligning features and the reduced number of parts, the pump can be easily changed from aspirating and dispensing a first volume of fluid to aspirating and dispensing a second volume of fluid.
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Citations
11 Claims
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1. A precision pumping device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
a second piston having a different size than the first piston, said second piston substitutable for said first piston; and
a second chamber having a different size than said first chamber, said second chamber substitutable for said first chamber, said second piston and said second chamber adapted to dispense or aspirate a second volume of liquid.
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Specification