초록 ▼

A liquid pipetting system for aspirating and dispensing small samples of fluid and diluents. The pipetting system consists of a coaxial needle serving as the pipette tip and a metering system to control the fluids. Precise dispensing of small amounts of liquid from the inner needle is made possible

A liquid pipetting system for aspirating and dispensing small samples of fluid and diluents. The pipetting system consists of a coaxial needle serving as the pipette tip and a metering system to control the fluids. Precise dispensing of small amounts of liquid from the inner needle is made possible by surrounding the sample liquid with a miscible diluting liquid thereby establishing a controlled interface and conveying the sample liquid into the receiving chamber with that miscible diluting liquid.

대표청구항 ▼

A method for accurately aspirating and dispensing small samples of a first liquid using a probe having inner and outer coaxially disposed conduits defining a coaxial region comprising the steps of: aspirating the first liquid into the inner conduit; flushing the annular space between the conduits wi

A method for accurately aspirating and dispensing small samples of a first liquid using a probe having inner and outer coaxially disposed conduits defining a coaxial region comprising the steps of: aspirating the first liquid into the inner conduit; flushing the annular space between the conduits with a second liquid miscible with the first liquid to remove the first liquid from the entire exterior of the inner conduit and establish a controlled interface between the first and second liquids; dispensing a predetermined quantity of the first liquid from the inner conduit into the second liquid in the annular space; and flushing the annular space with a predetermined quantity of the second liquid thereby precisely dispensing the first liquid.