Passive one-way valve for micro-fluidic chip

Abstract

The invention discloses a passive one-way valve for a micro-fluidic chip. The passive one-way valve is mounted in a micro-fluidic flow channel and comprises a membrane. One end of the membrane is fixedly mounted on the side wall of the micro-fluidic flow channel, and the other end of the membrane is suspended. The cross sections, at the two sides of the mounting position of the membrane, of the micro-fluidic flow channel are different, wherein the cross section at one side is small, and the side is considered as a side A; and the cross section at the other side is large, and the side is considered as a side B. The outer edge dimension of the suspended end of the membrane is greater than the inner diameter dimension of the portion, at the side A, of the micro-fluidic flow channel; and meanwhile, a gap exists between the outer edge of the suspended end of the membrane and the side wall of the micro-fluidic flow channel and only allows gas to penetrate. In this way, the passive one-way valve can achieve the purposes that liquid is controlled to flow unidirectionally, and gas is controlled to pass bidirectionally without being operated through an external instrument.

Description

technical field [0001] The invention relates to the field of microfluidic technology, in particular to a passive one-way valve structure for controlling the flow direction of liquid and ensuring the unimpeded flow of gas. Background technique [0002] In the microfluidic chip, the precise flow of liquid is achieved through valve control. At present, most of the commonly used valves are simple valves, which are closed by air pressure or mechanical force to block the flow of liquid; there is also a rotating device to block the flow of liquid. [0003] Microfluidic valves are roughly divided into: rotary valves, paraffin valves, paraffin hot-melt valves, magnet moving valves, pneumatic valves, and mechanical valves. Turning the valve is by turning the rotor, and the valve closes when the micro-pillar on the rotor contacts the micro-hole on the base. Paraffin valves are generally used in chips where the liquid is driven by centrifugal force, and the paraffin valve is pushed op...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the above-mentioned microfluidic control valve only completes the blocking function of the flow path through air pressure or mechanical force. The structure of the microfluidic chip is complicated, the requirements for the instrument are complicated, and it is not easy to process, assemble and use

[0005] In addition, the existing microfluidic chip valve device has a single function and requires external instruments to control it. The stability is not high, and the requirements for continuous operation of the instrument are high. demand for mobility

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