Microfluidic Microvalve and Driving Device

Abstract

The invention relates to a micro valve structure as a basic functional unit of a micro diaphragm pump chip and a driving device. A microfluidic micro valve comprises a flow channel structural layer, a diaphragm layer, a driving structural layer, transmission fluid, a temperature sensitive material and a heat exchange surface. The driving device at least comprises a chip fixture, a temperature control device and a thermal control surface. The temperature sensitive material and the transmission fluid are closed in a chip by the micro valve structure; a driving force is generated by the solid-liquid state change of the temperature sensitive material; chip fluid is driven by temperature control for a thermal contact zone of the chip; various micro control devices on the chip can be evolved from the micro valve on the plastic microfluidic chip based on a micro diaphragm pump technology; the micro control devices form different combinations and are integrated according to the requirement, so the control over trace fluid on the chip can be realized. The scheme disclosed by the invention has the characteristics that the driving device is separated from the flow channel; the chip is easy for processing and low in cost; the connection of the chip and the driving device is simple and reliable; the driving device can be repeatedly used.

Description

technical field [0001] This patent relates to a microfluidic microvalve and a driving device, in particular to a basic functional unit microvalve and a driving device on a plastic microfilm pump chip. Background technique [0002] Existing laboratory analysis methods are often limited by factors such as complex pretreatment and detection processes, strict site requirements, etc., and are easily interfered by environmental and human factors. The microfluidic chip system is used to drive a small volume of fluid. It has good sealing properties, is easy to use, uses a small amount of samples, and is less disturbed by human factors. It has good applications in life science research, disease diagnosis, food safety, and environmental analysis. prospect. [0003] Plastic microfluidic chips have attracted extensive attention due to their advantages of one-time use and low cost. The invention patent (CN101282789) provides a variety of functional structures based on micro-membrane pu...

AI Technical Summary

Problems solved by technology

In order to use gas energy to drive the diaphragm, the system sets up a pneumatic interface for each micro-membrane pump. At the same time, in order to ensure that the chip can be easily disassembled, the pneumatic interface can only be temporarily sealed, especially when the high-pressure gas pushes the micro-membrane pump, it is easy to leak

Since a large number of basic micro-membrane pump units need to be driven on the microfluidic chip, any unit leakage may cause the chip to fail, causing reliability risks

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