Patent ID: 8268261

Claim:
A pipette device comprising: a pipette comprising: a pipette body; and a pipette core member retained inside the pipette body, the pipette core member comprising: a pump body comprising: an electroosmotic flow pump having a first suction/discharge port and a second suction/discharge port, wherein the electroosmotic flow pump further comprises a first electrode, a second electrode, and an electroosmotic material sandwiched between the first electrode and the second electrode; and a reservoir integrally formed with the electroosmotic flow pump, and configured to store a driving liquid and in liquid communication with the first suction/discharge port of the electroosmotic flow pump; and a capillary secured to the pump body and connected to the electroosmotic flow pump, wherein the capillary also communicates with the second suction/discharge port of the electroosmotic flow pump; a controller having a setting device that sets a voltage value of a control signal output that is used for retaining a sample in a tip end of the capillary of the pipette, wherein the setting device comprises: a switch device that switches polarity of the voltage value of the control signal output applied to the electroosmotic flow pump; and a multiplying factor setting device configured to multiply the voltage value by a predetermined multiplying factor; and a control signal line that electronically connects the electroosmotic flow pump and the controller and transmits the control signal output from the controller to the electroosmotic flow pump.