Bioimpedance Electrode Layout for Accurate Total Body Water Sensing
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Solution Overview
Problem
Existing bioelectrical impedance measurement devices, especially in portable and wearable forms, inaccurately measure total body water due to fluctuations caused by user activity such as exercise, leading to incorrect readings despite minimal changes in actual body water content.
Innovation Solution
An electronic device with multiple electrode bodies, each comprising symmetrically arranged current and voltage electrodes, measures bioelectrical impedance in different directions to identify phases, allowing for accurate determination of total body water amounts by adjusting for muscle activity effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bioelectrical impedance measurement technology is introduced to portable or wearable devices for real-time monitoring, then ease of operation and real-time monitoring capability are improved, but measurement precision deteriorates due to incorrect total body water measurements during user activity
Solution Approach 1:
The device divides the measurement into multiple directional components using separate electrode bodies oriented in different directions. Instead of using a single impedance measurement, the system segments the measurement into first and second bioelectrical impedance values corresponding to different spatial directions, then processes these segmented measurements to identify the component least affected by muscle activity.
Solution Approach 2:
The patent introduces phase angle as an intermediary parameter to distinguish between impedance changes caused by muscle activity and those caused by actual total body water changes. By using phase information as a mediator, the system can filter out artifacts from muscle contraction and isolate the true physiological signal.
2Measurement precision
If multiple electrode bodies are used to measure impedance in different directions, then measurement precision is improved by identifying phases, but device complexity increases
Solution Approach 1:
The patent employs asymmetric electrode arrangements where electrode bodies are positioned and oriented differently relative to each other (e.g., one pair along the longitudinal axis, another pair along the transverse axis). This asymmetric configuration enables directional impedance measurements that can distinguish muscle activity artifacts from true physiological changes.
Solution Approach 2:
The system transitions from single-dimensional impedance measurement to multi-dimensional measurement by adding spatial orientation as a new dimension. Electrode bodies are arranged to measure impedance along different spatial axes, and the system processes these multi-dimensional measurements to extract the physiological signal independent of muscle activity direction.
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 device provides reliable and accurate total body water measurements by compensating for muscle activity-induced impedance fluctuations, ensuring precise body composition analysis regardless of user activity states.
Implementation Method 1
Bioelectrical impedance measurement technology is widely used as it is non-invasive, cost-saving, and has excellent stability in measuring total body water and body composition
Data Source
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AI summary
Disclosed is an electronic device. The electronic device includes a first electrode body configured to be in contact with a body of a user and comprising a first current electrode and a second current electrode symmetrically arranged in a first direction and a first voltage electrode and a second voltage electrode symmetrically arranged in the first direction, a second electrode body configured to be in contact with the body of a user and, and one or more processor configured to: obtain a first bioelectrical impedance through the first electrode body comprising a first current electrode and a second current electrode symmetrically arranged in a first direction and a first voltage electrode and a second voltage electrode symmetrically arranged in the first direction, obtain a second bioelectrical impedance through the second electrode body comprising a third current electrode and a fourth current electrode symmetrically arranged in a second direction and a third voltage electrode and a fourth voltage electrode symmetrically arranged in the second direction, identify one of the first bioelectrical impedance and the second bioelectrical impedance based on phases of each of the first bioelectrical impedance and the second bioelectrical impedance, obtain a total body water amount of the user using the identified bioelectrical impedance, and provide the obtained total body water amount.