Impedance-Type Chip for Real-Time Sweat Pressure Sensing
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Solution Overview
Problem
Current methods for detecting sweat and analyzing its composition in real-time are inefficient and lack digital analysis capabilities, making it challenging to accurately monitor physiological states such as temperature regulation and dehydration.
Innovation Solution
An impedance-type chip with comb-shaped electrodes and a microfluidic channel, connected to a cavity with a sweat inflow hole, which measures sweat pressure by applying pulsed voltage and correcting for ion concentration and pH values to provide a calibrated resistance value, allowing for real-time, efficient, and accurate sweat analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical signals are used to detect sweat and its composition, then detection precision is improved, but real-time digital analysis capability remains insufficient
Solution Approach 1:
The chip is divided into multiple functional modules including microfluidic channels for sweat collection, comb-shaped electrodes for impedance measurement, and integrated processing circuits for real-time digital analysis. This segmentation allows each module to specialize in specific functions, improving both detection precision and real-time analysis capability simultaneously
Solution Approach 2:
The impedance-type chip integrates multiple functions into a single device: sweat collection through microfluidic channels, electrical impedance measurement for composition analysis, temperature sensing, and real-time digital processing. This multi-functionality resolves the contradiction by enabling both precise detection and real-time analysis within one unified system
2Measurement precision
If comb-shaped electrodes with multiple sub-electrodes are used, then sweat pressure measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The comb-shaped electrodes are segmented into multiple sub-electrodes arranged in a comb pattern, where each tooth of the comb represents an independent measurement point. This segmentation enables precise localization of sweat pressure sources while maintaining a relatively simple overall electrode structure that can be fabricated using standard planar processes
Solution Approach 2:
The patent replaces complex mechanical pressure sensing structures with electrical impedance measurement using comb-shaped electrodes. The sweat pressure is detected through changes in electrical impedance caused by sweat accumulation, eliminating the need for complex mechanical sensors while achieving high measurement accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous, non-invasive, and real-time monitoring of sweat pressure, providing a reliable indicator of physiological states, with the ability to digitize and standardize sweat pressure measurements for long-term monitoring.
Implementation Method 1
detecting the state of perspiration and analyzing the composition of sweat can be used as an important indicator to determine the physiological states. However, as for detecting the amount of perspiration, efficient, real-time and digital analysis is still a challenge.
Implementation Method 2
Using electrical signals to detect the sweat and/or its composition is mainly to detect sweat secretion based on the capacitance, current, or impedance.
Implementation Method 3
the sweat pressure is generated when the sweat flows into the microfluidic channel
Data Source
AI summary
An impedance-type chip for real-time sensing sweat pressure, a micro-control system, and method thereof are provided for monitoring a physiological state of a subject. The impedance-type chip includes a substrate, a pair of comb-shaped electrodes, a first double-layered junction plate, a microfluidic channel plate, a second double-layered junction plate, and a sealing plate. Each the comb-shaped electrodes has a plurality of sub-electrodes and is disposed on the substrate to provide different impedance values. The first double-layered junction plate is disposed on the substrate, the microfluidic channel plate is disposed on the first double-layered junction plates, and the second double-layered junction plate is disposed on the microfluidic channel plate, wherein the first double-layered junction plate, the microfluidic channel plate, and the second double-layered junction plate have a microfluidic channel with a cavity. The sealing plate is disposed on the second double-layered junction plate to seal the microfluidic channel.