Quantitative pipet

Abstract

The invention relates to experiment equipment, and especially relates to improvement on a quantitative pipet. The quantitative pipet comprises an air bag 1, a gas-guide tube 2, a liquid storage bag 3 and a quantitative capillary 4; the air bag 1, the gas-guide tube 2 and the liquid storage bag 3 are made from a transparent high-molecular material, and the inner holes of the air bag 1, the gas-guide tube 2 and the liquid storage bag 3 are in communication; the quantitative capillary 4 is made from a transparent high-molecular material or a glass material, the upper end of the quantitative capillary 4 is at the upper part of the liquid storage bag and is close to the gas-guide tube 2, a certain distance is reserved between the upper end of the quantitative capillary 4 and the gas-guide tube 2, and the internal diameter and the length of the quantitative capillary 4 are selected according to the needed capacity of a to-be-transferred liquid. When the quantitative pipet is used, the gas bag 1 is slightly pinched, the lower end of the quantitative capillary 4 is immersed in a to-be-sucked liquid, and then the air bag 1 is slightly loosened, so that the liquid is sucked into the quantitative capillary 4, when the quantitative capillary 4 is full with the liquid, superfluous liquid overflows from the top end of the quantitative capillary 4 and flows into the liquid storage bag 3, when liquid suction is stopped, the quantitative capillary 4 is full with the sucked liquid, the capacity of the sucked liquid is a preset capacity, the liquid storage bag 3 holds a part of superfluous liquid, and the liquid in the quantitative capillary 4 completely drops when the air bag 1 is slightly pinched, and therefore a microscale quantitative liquid is easily accurately got.

Description

Technical field: [0001] The present invention relates to experimental equipment, in particular to the improvement of quantitative pipette. Background technique: [0002] Quantitative pipetting is a work that is done all the time in all physical, chemical and biological laboratories. Large-capacity pipetting uses glass or plastic pipettes at home and abroad, and small-capacity or micro-volume pipetting is used both at home and abroad. Use a micropipette with a disposable nozzle. In recent years, some domestic and foreign users are also using the self-priming quantitative micro blood collection tube produced by Dongtai Kehua Medical Instrument Co., Ltd., but for those who need to pipette When the amount is large, such as 50--1000ul, the automatic suction of the sample cannot be completed through the capillary action of the self-priming quantitative micro-collection tube. At present, the pipette that can easily and accurately complete the pipetting of small and micro liquid sa...

AI Technical Summary

Problems solved by technology

[0002] Quantitative pipetting is a work that is done all the time in all physical, chemical and biological laboratories. Large-capacity pipetting uses glass or plastic pipettes at home and abroad, and small-capacity or micro-volume pipetting is used both at home and abroad. Use a micropipette with a disposable nozzle. In recent years, some domestic and foreign users are also using the self-priming quantitative micro blood collection tube produced by Dongtai Kehua Medical Instrument Co., Ltd., but for those who need to pipette When the amount is large, such as 50---1000ul, it is impossible to complete the automatic suction through the capillary action of the self-priming quantitative micro blood collection tube

At present, the pipette that can easily and accurately complete the transfer of small and micro liquid samples has not been seen at home and abroad

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