Multi-Position Bioimpedance Body Composition Analysis
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Solution Overview
Problem
Current body composition analysis methods, such as bioelectrical impedance analysis, face challenges in providing accurate and efficient measurements, especially when subjects move or change posture during the analysis, leading to inconsistencies in data acquisition and reduced accuracy.
Innovation Solution
The method involves simultaneously measuring voltage signals at multiple positions on the body using multiple current signals with different frequencies, allowing for the calculation of impedance values across various body segments, which are then processed to assess body composition parameters like body water, fat, and muscle percentage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-point bioelectrical impedance analysis is used, then the measurement process is simple, but the accuracy of body composition analysis deteriorates when subjects move or change posture
Solution Approach 1:
The body is divided into multiple measurement segments (upper body, lower body, trunk) with electrodes placed at multiple positions on each segment. This segmentation allows independent measurement of each body portion, improving overall measurement accuracy even when the subject moves, as movement in one segment does not affect measurements in other segments.
Solution Approach 2:
The invention transitions from single-point impedance measurement to multi-point voltage signal measurement across different body segments. By measuring voltages at multiple electrode positions simultaneously and calculating impedance ratios between segments, the system adds spatial dimensionality to the measurement, enabling more accurate body composition analysis that is less sensitive to subject movement.
2Reliability
If multiple voltage signals are measured simultaneously at multiple body positions, then the accuracy and reliability of body composition assessment improves, but the complexity of the measurement system increases
Solution Approach 1:
The measurement system is designed to perform multiple functions simultaneously: it measures impedance in multiple body segments, calculates impedance ratios between segments, and assesses overall body composition all in one measurement session. This multi-functionality increases reliability by providing comprehensive data while managing system complexity through integrated processing.
Solution Approach 2:
The system processes measured voltage signals to calculate impedance values and their ratios between different body segments. This processed feedback information is then used to assess body composition parameters, creating a closed-loop measurement and analysis system that improves reliability through systematic data processing and validation.
3Measurement precision
If impedance ratios between multiple body segments are calculated, then the accuracy of body composition parameters (body water, fat, muscle percentage) improves, but the processing complexity increases
Solution Approach 1:
The system pre-calculates and stores impedance ratios between different body segments based on the measured voltage signals. These pre-computed ratios are then used directly in body composition parameter calculations, eliminating the need for complex real-time computations and improving measurement efficiency without sacrificing accuracy.
Solution Approach 2:
The invention transforms raw voltage signal measurements into impedance values, then into impedance ratios between segments, and finally into body composition parameters. This parameter transformation sequence simplifies the processing by breaking down complex calculations into manageable steps, maintaining accuracy while improving computational efficiency.
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
This approach enables more accurate and rapid assessment of body composition by minimizing the impact of subject movement and posture changes, providing reliable data in a single measurement session.
Implementation Method 1
Bioelectrical impedance analysis is one of many ways to estimate body composition. The method comprises: applying a current signal between the first extremity current electrode and the second extremity current electrode; measuring voltages at the first extremity voltage electrode A, at the second extremity voltage electrode A, at the third extremity voltage electrode A, and at the fourth extremity voltage electrode A; processing the measured voltages which provides a first value representing impedance
Data Source
AI summary
A method of analyzing a composition of a human body having a plurality of body segments is disclosed. The method can include applying a current signal to a body. The method can further include simultaneously measuring a plurality of voltage signals from a plurality of measuring positions of the body during a predetermined period, and processing at least two of the plurality of voltage signals to determine a composition parameter of a body segment so as to assess or analyze composition of the body.