Liquid pipetting device and liquid pipetting method

Abstract

The invention discloses a liquid pipetting device and a liquid pipetting method. The liquid pipetting device includes a probe, a liquid circuit mechanism, an air circuit pipe, an air supply mechanism and a pressure sensor; the probe is used to load a disposable liquid suction head to absorb liquid ; The liquid circuit mechanism is used to draw and fill liquid samples through a disposable suction head; the liquid circuit mechanism and the gas circuit tube are connected to the probe; the liquid circuit mechanism, the gas circuit The tubes are all connected to the probe; the gas supply mechanism and the pressure sensor are connected in series with the gas circuit tube after being connected in parallel; the gas supply mechanism is used to blow air to the gas circuit tube. When the probe is lowered, the air supply mechanism supplies air to the air pipe to improve the stability of the air pressure in the air pipe, so that when the liquid suction head touches the liquid surface of the body fluid sample, the air pipe The air pressure in the tube changes significantly compared to the air pressure before contacting the liquid, and it is easy to determine whether the liquid level is detected according to the change in the air pressure in the gas line tube, thereby improving the accuracy of liquid level detection of the body fluid sample.

Description

technical field [0001] The invention relates to the technical field of liquid pipetting equipment, in particular to a liquid pipetting device and a liquid pipetting method. Background technique [0002] At present, it involves liquid pipetting devices for sucking and distributing liquid volume. Most of them use pipelines made of stainless steel to directly absorb and fill body fluid samples. After cleaning the contact parts of the stainless steel pipelines, they can be reused. There is a possibility of mutual contamination between the dispensed liquids and interference with the accuracy of the measurement results. In order to avoid this problem, a disposable pipette tip is used to distribute the liquid, and the liquid level of the sample is detected through the change of electrostatic capacity between the conductive pipette tip and another conductive container, but the capacitive liquid level detection method is easily disturbed. The errors in detecting the liquid level and...

AI Technical Summary

Problems solved by technology

[0002] At present, it involves liquid pipetting devices for sucking and distributing liquid volume. Most of them use pipelines made of stainless steel to directly absorb and fill body fluid samples. After cleaning the contact parts of the stainless steel pipelines, they can be reused. There is a possibility of mutual contamination between the dispensed liquids and interference with the accuracy of the measurement results

In order to avoid this problem, a disposable pipette tip is used to distribute the liquid, and the liquid level of the sample is detected through the change of electrostatic capacity between the conductive pipette tip and another conductive container, but the capacitive liquid level detection method is easily disturbed. Causes misdetection of the liquid level and large error in detecting the height of the liquid level. When performing micro-dispensing, this error will seriously affect the final result of the test

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