Micro pump capable of monitoring sweat flow in real time based on capillary-evaporation effect

Abstract

The invention discloses a micro pump capable of monitoring the sweat flow in real time based on the capillary-evaporation effect, and belongs to the field of microfluidics control chip systems. The micro pump collects and conveys sweat through the capillary-evaporation effect, and an electrode integrated with a channel can monitor the sweat flow in real time. The micro pump is divided into three layers, only three hexagonal outlet holes are formed in the top layer, and each outlet hole is composed of a plurality of hole arrays with completely the same aperture and completely the same hole pitch. The middle layer is provided with an inlet, three outlets and a three-way channel, and the positions of the outlets correspond to the positions of the outlet holes respectively. The bottom layer isprovided with an inlet, and three electrodes are integrated at the positions, corresponding to the center position of the main channel in the middle layer, of the bottom layer and include the reference electrode made of gold, the working electrode made of platinum and the counter electrode made of gold in sequence from left to right. In the micro pump, the three electrodes and a computer system are connected with an electrochemical working station, and the real-time flow, namely the sweating rate, of a micro channel is obtained by observing a current value in the computer system and using a limited steady-state response equation of a flow-through electrode.

Description

technical field [0001] The invention belongs to the field of microfluidic chip systems, and in particular relates to a microfluidic chip which collects sweat by capillary-evaporation effect and monitors sweat flow in real time by electrochemical principles. Background technique [0002] Human sweat contains rich physiological and metabolic information, which can be used for disease diagnosis, drug abuse detection, and sports performance optimization. By analyzing the composition of sweat, useful information about the physiological state of the body can be obtained. Certain genetic diseases, such as cystic fibrosis, can be diagnosed from a baby's sweat composition. In addition, sweat can also be assessed for several key biomarkers related to human health performance, such as sweat rate, which can determine whether an athlete is at risk of dehydration. Higher dehydration values ​​can affect the cardiovascular system, leading to heat cramps or heatstroke. , monitoring changes ...

AI Technical Summary

Problems solved by technology

Impedance method is susceptible to factors such as strong emotions, startle events, stress-induced changes; humidity capacitive sensor method has difficulty maintaining a fixed distance between sensors and is easily affected by motion artifacts resulting in false positives / negatives; patch method May clog sweat ducts or alter microclimate close to skin due to longest test time

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