Anti-back-suction electronic pipettor

Abstract

The invention relates to an anti-back-suction electronic pipettor which comprises a pipetting pipe, a pipetting pipe joint for mounting the pipetting pipe, a positive / negative pressure pump, a liquid absorbing switch, a liquid discharge switch and a liquid level monitoring module, wherein the positive / negative pressure pump, the liquid absorbing switch and the liquid discharge switch are connected in parallel; the liquid level monitoring module is used for monitoring a preset monitoring plane on the pipetting pipe and generating a corresponding monitoring signal; the liquid absorbing switch and the positive / negative pressure pump which are connected in parallel to form a liquid absorbing control loop, and the liquid discharge switch and the positive / negative pressure pump which are connected in parallel to form a liquid charge control loop; and the liquid level monitoring module is connected with the liquid absorbing switch and used for controlling the state of the liquid absorbing switch according to the corresponding monitoring signal of the liquid level monitoring module. In the anti-back-suction electronic pipettor, the preset monitoring plane on the pipetting pipe is monitored by adopting the liquid level monitoring module; the corresponding monitoring signal is generated according to the condition whether liquid in the pipetting pipe reaches the preset monitoring plane or not; and the state of the liquid absorbing switch is monitored according to the corresponding monitoring signal so as to effectively prevent back-suction phenomena, therefore, the cross infection ofsolvents is prevented.

Description

【Technical field】 [0001] The invention relates to a pipette, in particular to an electronic pipette for preventing sucking back. 【Background technique】 [0002] As the main pipetting tool in the laboratory, the electronic pipette assists the pipette to suck or discharge liquid. During the use of the electronic pipette, if excessive liquid is sucked, which exceeds the volume of the pipette, the excess liquid will enter the pipette and suck back. Suckback is prone to occur during long-term operations, novice operations, and cell operations. Suckback is prone to adverse effects, such as experimental failure, sample cross-contamination, risk of biological diffusion, shortened pipette life, etc. [0003] There are two traditional anti-suckback methods. One is to install a cotton filter plug on the upper end of the pipette, but the effect is poor and cannot effectively prevent suckback; the other is to install a waterproof filter behind the pipette joint. This method can not re...

AI Technical Summary

Problems solved by technology

Suckback is prone to adverse effects, such as experimental failure, sample cross-contamination, risk of biological diffusion, shortened pipette life, etc.

[0003] There are two traditional anti-suckback methods. One is to install a cotton filter plug on the upper end of the pipette, but the effect is poor and cannot effectively prevent suckback; the other is to install a waterproof filter behind the pipette joint. This method can not really prevent sucking back, but can only prevent liquid from entering the negative pressure system of the pipette to reduce the adverse consequences of sucking back. Therefore, it cannot effectively solve problems such as experiment failure and cross-contamination, and after sucking back occurs, it must be Replacing the waterproof filter will affect the progress of the experiment and increase the cost of the experiment

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