Hamilton Bonaduz Ag

Tecan Trading Ag

Hamilton Medical Ag

Tecan Schweiz Ag

Urs Lendenmann

Noa Schmid

Hanspeter Romer

Fridolin Gysel

Helmut Knapp

Vinzenz Kirste

Tobias Seiler

Fabian Winter

Matthias Himmelstoss

Christoph Blattmann

A pipetting device has a pipetting channel extending along a channel path, in which a piston is accommodated to be movable along the channel path to change the pressure of a working gas that wets the piston on a dosing side facing the dosing liquid. The pipetting device includes a movement drive for driving the piston along the channel path and a control unit configured to operate the movement drive for pipetting a predetermined single dosing volume of less than 5 &#x3bc;l with the piston moving in the pipetting direction and its dosing side end face sweeping over a pipetting volume which is not less than 1.4 times greater than the single dosing volume, and subsequently moving in a counter pipetting direction and its dosing side end face sweeping over a counter pipetting volume, wherein not more than 50 ms elapse between beginning control signals.

Pipetting device for pipetting small volumes of liquids

A pipette device including a metering liquid receptacle designed to be filled, at least in part, with working fluid and which has a pipette opening as a first tapering of cross-section of flow, a pressure change device which is designed to change the pressure of the working fluid in the metering liquid receptacle, and a throttle point in a pipette duct designed to be filled with working fluid as a further tapering of cross-section of flow. The throttle point is arranged fluid-mechanically between the metering liquid receptacle and the pressure change device and is dimensioned in such a way that a ratio of a flow resistance of the pipette opening for dispensed metering liquid to a flow resistance of the throttle point for working fluid, which flows through the throttle point when the metering fluid is dispensed, is less than 0.5.

Pipette device having a throttle point in the pipette duct

Growing community of inventors

Chur, Switzerland

Urs Lendenmann