Biosignal Electrode Layout With Posture-Based Impedance Correction
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Solution Overview
Problem
Electronic devices for bio-electrical impedance analysis (BIA) measurement face inaccuracies due to improper electrode placement, leading to degraded accuracy and reduced user convenience, especially when users grip fingers in unnatural postures or when multiple electrodes are positioned for easy gripping, limiting the degree of freedom in electrode arrangement.
Innovation Solution
An electronic device with a first and second group of electrodes, utilizing a processor to obtain impedance values in different postures, calculate correction values, and store them for accurate measurement by applying these corrections to the initial impedance values, ensuring stable and convenient biological signal measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple electrodes are disposed in a position for easy gripping, then ease of operation is improved, but device complexity increases and measurement precision deteriorates
Solution Approach 1:
The device performs preliminary measurements in advance to establish correction values. Multiple impedance values are measured before the actual measurement, and correction values are calculated based on these preliminary measurements to compensate for posture-related errors, ensuring accurate measurements even in convenient gripping positions
Solution Approach 2:
The device uses feedback from preliminary measurements to adjust and correct the actual measurement. Correction values derived from preliminary data are applied to compensate for errors, creating a closed-loop system that improves measurement precision while maintaining ease of operation
2Measurement precision
If electrodes are arranged for natural finger gripping, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The device performs preliminary measurements in advance to establish correction values. Multiple impedance values are measured before the actual measurement, and correction values are calculated based on these preliminary measurements to compensate for posture-related errors, ensuring accurate measurements even in convenient gripping positions
Solution Approach 2:
The device changes the measurement parameters by taking multiple impedance values at different conditions during preliminary measurements. These varying parameters are used to calculate correction values that account for different gripping postures, allowing the device to maintain accuracy across various operation conditions
3Measurement precision
If correction values are calculated through periodic measurements, then measurement precision is maintained, but loss of time increases
Solution Approach 1:
The device performs preliminary measurements in advance to establish correction values. Multiple impedance values are measured before the actual measurement, and correction values are calculated based on these preliminary measurements to compensate for posture-related errors, ensuring accurate measurements even in convenient gripping positions
Solution Approach 2:
The device changes the measurement parameters by taking multiple impedance values at different conditions during preliminary measurements. These varying parameters are used to calculate correction values that account for different gripping postures, allowing the device to maintain accuracy across various operation conditions
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
Secures electrode arrangement freedom and maintains measurement accuracy through periodic correction, providing accurate biological signal measurement by correcting impedance values based on different user postures.
Implementation Method 1
obtain a first impedance value, based on a first group of electrodes included in an electrode module of an electronic device being in contact with a first portion of a human body
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present document relates to an electronic device for measuring biosignals and an operation method in the electronic device, the operating method in the electronic device according to an embodiment may comprise the steps of: obtaining a first impedance value on the basis of contact between a first group of electrodes included in an electrode module of the electronic device and a first part of a human body, and contact, by a user's first measurement posture, between a first region of a second part of the human body and two electrodes among a second group of electrodes included in the electrode module; obtaining a second impedance value on the basis of contact between the first group of electrodes and the first part of the human body, contact, by a user's second measurement posture, between the first region of the second part of the human body and at least one of the two electrodes, and contact between the second region of the second part and one among the second group of electrodes, which is different from the two electrodes; obtaining a correction value on the basis of the first impedance value or the second impedance value and storing the correction value in a memory; and obtaining the corrected first impedance value by applying the correction value to the first impedance value. Other embodiments may also be possible.