Physiological Signal Measuring Device Impedance Correction
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Solution Overview
Problem
Physiological signal measuring devices face accuracy and stability issues due to interference between electrode sheets and skin, particularly when fabric electrodes are used or during large movements, which affects the measurement of health parameters like respiratory rate and heart rate.
Innovation Solution
A method and device that input signals at different frequencies to measure impedance values between electrode sheets and skin, calculate interference impedance, and correct the measured physiological signal to enhance accuracy and stability, using a fast analytic method to estimate interference impedance efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fabric electrodes are used or large movements occur, then ease of operation and adaptability improve, but measurement precision and reliability deteriorate due to increased interference between electrode sheets and skin
Solution Approach 1:
The patent replaces direct physical contact measurement with electrical impedance measurement. Instead of relying solely on mechanical contact between electrode sheets and skin, the system uses electrical signals to detect and quantify the interference impedance, then applies correction algorithms to compensate for the interference effects, thereby maintaining measurement precision while using comfortable fabric electrodes during movement.
Solution Approach 2:
The patent changes the measurement parameter from direct physiological signal detection to impedance-based interference detection. By measuring impedance at multiple frequencies and analyzing the changes, the system can separate interference components from actual physiological signals, enabling accurate measurement even when electrode-skin contact conditions vary during movement.
2Adaptability or versatility
If fabric electrodes are used or large movements occur, then adaptability improves, but reliability deteriorates due to interference between electrode sheets and skin
Solution Approach 1:
The patent replaces direct physical contact measurement with electrical impedance measurement. Instead of relying solely on mechanical contact between electrode sheets and skin, the system uses electrical signals to detect and quantify the interference impedance, then applies correction algorithms to compensate for the interference effects, thereby maintaining measurement precision while using comfortable fabric electrodes during movement.
Solution Approach 2:
The patent implements a feedback mechanism where the measured impedance values are used to calculate interference impedance, which then feeds into the signal correction process. The system continuously monitors impedance changes and dynamically adjusts the physiological signal correction based on the calculated interference impedance, improving reliability under varying movement conditions.
3Measurement precision
If impedance measurement and correction processing are performed, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent makes the electrode sheets multi-functional by integrating both physiological signal sensing and impedance measurement capabilities into the same component. This eliminates the need for separate measurement systems and reduces overall device complexity while maintaining improved measurement precision through impedance-based correction.
Solution Approach 2:
The patent merges the signal acquisition and impedance measurement functions into a unified processing framework. By combining the correction processing with the existing signal acquisition system rather than adding separate independent subsystems, the patent achieves enhanced measurement precision while minimizing the increase in device complexity.
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
The method significantly improves the accuracy and stability of physiological signal measurements by correcting for interference, allowing for more precise health parameter monitoring, as demonstrated by the comparison of measured and corrected signals showing minimal discrepancy and enhanced signal intensity.
Implementation Method 1
A first impedance value corresponding to the first inputting signal, a second impedance value corresponding to the second inputting signal and a third impedance value corresponding to the third inputting signal between the electrode sheets and the skin are respectively measured
Data Source
AI summary
A physiological signal measuring method and a physiological signal measuring device are provided. The physiological signal measuring method includes the following steps: A first inputting signal having a first frequency, a second inputting signal having a second frequency and a third inputting signal having a third frequency are respectively inputted to at least two electrode sheets attached on a skin. A first impedance value corresponding to the first inputting signal, a second impedance value corresponding to the second inputting signal and a third impedance value corresponding to the third inputting signal are respectively measured. An interference impedance between the electrode sheets and the skin is obtained according to the first frequency, the second frequency, the third frequency, the first impedance value, the second impedance value and the third impedance value. A measured physiological signal is corrected according to the interference impedance to obtain a corrected physiological signal.