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Drip-resistant pipetting device and drip-resistant pipetting method

  • US 7,581,660 B2
  • Filed: 11/09/2005
  • Issued: 09/01/2009
  • Est. Priority Date: 11/09/2005
  • Status: Active Grant
First Claim
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1. A liquid-metering device for aspirating and dispensing liquids, the device comprising:

  • a vessel which is at least partially filled with a gas and has an opening through which a liquid is received into the vessel or is discharged therefrom, the gas, when the liquid is received, being enclosed by vessel walls and the liquid itself;

    a gas-pressure-changing device for changing the gas pressure in said vessel;

    a state-variable-detecting device for detecting at least one state variable of the gas in said vessel; and

    a control device which activates said gas-pressure-changing device as a function of the state variable detected by said state-variable-detecting device, wherein said control device is a regulating device which, at least during a regulating time segment between liquid reception and liquid discharge, activates said gas-pressure-changing device as a function of the detected state variable in such a manner that the actual gas pressure in said vessel is kept essentially at a predetermined desired gas pressure during the regulating time segment, and further, wherein the regulating time segment comprises a time domain in a first half of a period of time lying between a final moment of a liquid-receiving operation and a moment of starting a liquid-discharging operation.

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