Liquid flow channel switching structure

Abstract

The invention discloses a liquid flow channel switching structure which comprises a chip cover plate and a centrifugal rotating mechanism used for driving the chip cover plate to do centrifugal rotating motion, and further comprises a magnet, and the magnet is fixedly installed outside and is arranged close to the centrifugal circle center of the chip cover plate when the chip cover plate does the centrifugal rotating motion; a sample injection port assembly and a selection cavity are further formed in the chip cover plate, and a first liquid cavity and a second liquid cavity which are communicated with the selection cavity are further formed in the two ends of the lower portion of the selection cavity respectively. The guide block in the cavity on the chip cover plate deflects left and right by utilizing the magnetic force of the magnetic field and the steering switching of the centrifugal rotating mechanism, so that the switching of the liquid flow channels in the cavity is realized, and the switching precision of the liquid flow channels can be improved by adopting a mode of firstly switching the flow channels and then flowing a liquid sample, and meanwhile, the switching precision of the liquid flow channels is improved. The liquid flow channels can be switched only by switching the rotating direction and the rotating speed of the centrifugal rotating mechanism, cost is low, use is convenient, and practicability is high.

Description

technical field [0001] The invention relates to the technical field of microfluidic chips, in particular to a liquid flow channel switching structure. Background technique [0002] In the application scenarios of microfluidic chips, for point-of-care diagnostic (POCT) devices based on microfluidics, "sample-to-answer" ('sample-to-answer') is an important goal of such devices. To achieve "sample in and results out", it is necessary to accurately control the flow directions of different liquids. When the waste liquid enters the collection chamber, it will seriously interfere with the experimental results, and the collection liquid is insufficiently collected (the collection liquid remains in other places upstream of the chip or enters the The waste liquid chamber) affects the size of the final test value of the microfluidic chip, so it is necessary to control the flow direction of the liquid through a special structure. [0003] The conventional method of controlling the flow...

AI Technical Summary

Problems solved by technology

[0003] Conventional methods of controlling liquid flow usually use special valve structures, such as paraffin valves, PDMS valves, and solenoid valves, etc., but the integrated valve structure increases the difficulty of chip processing, which is not conducive to the assembly and processing of microfluidic chips, and improves At the same time, the paraffin valve can only realize the opening or closing of the liquid channel, the PDMS valve needs the liquid to reach the preset pressure of the PDMS valve to work, and the solenoid valve needs to integrate the electromagnetic generator on the microfluidic chip platform. device, complicated to install and extremely inconvenient to use

Images