Multi-Electrode Impedance Measurement for Body Moisture
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Solution Overview
Problem
Existing moisture measurement devices in living bodies face inaccuracies due to varying penetration depths of current depending on electrode placement, which can miss moisture in specific areas like the lungs, especially in conditions like pulmonary edema.
Innovation Solution
A measurement device with multiple electrodes applies currents of different frequencies to determine the optimal electrode combination for impedance measurement using a Cole-Cole plot, ensuring deeper penetration and accurate moisture detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single electrode combination is used for impedance measurement, then the device complexity is reduced, but the measurement precision deteriorates because the current penetration depth may not reach moisture storage positions
Solution Approach 1:
The patent divides the measurement task into multiple segments by using several different electrode combinations instead of a single combination. Each combination targets different penetration depths and tissue regions, allowing the system to segment the measurement space and select the most appropriate combination for detecting moisture at various depths, thereby improving measurement precision without requiring a single complex electrode design
Solution Approach 2:
The patent implements a dynamic selection mechanism that automatically chooses the most suitable electrode combination based on real-time impedance characteristics. The control unit dynamically switches between different electrode combinations (e.g., 4-electrode, 6-electrode, 8-electrode configurations) depending on the measured impedance values and Cole-Cole plot analysis, enabling adaptive optimization of measurement precision while managing device complexity through software control
2Measurement precision
If multiple electrode combinations are tested to find the optimal one, then the measurement precision improves, but the measurement time increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing selection criteria and algorithms (such as Cole-Cole plot analysis thresholds and impedance ratio calculations) that enable rapid determination of the optimal electrode combination. By preparing the selection logic in advance and using automated decision rules based on initial impedance readings, the system can quickly identify the best electrode combination without exhaustive testing, thus improving measurement precision while minimizing time loss
Solution Approach 2:
The patent implements a feedback mechanism where the control unit continuously monitors impedance measurements from different electrode combinations and uses this feedback to determine the optimal combination. The system measures impedance with multiple combinations, compares the results against predetermined criteria (such as Cole-Cole plot characteristics), and selects the combination that provides the most accurate moisture detection, thereby achieving high precision efficiently through iterative feedback-based optimization
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 allows for more accurate measurement of moisture in the body by selecting the electrode combination that maximizes current penetration depth, enhancing diagnostic accuracy.
Implementation Method 1
measuring an impedance of the living body when a current is applied to the living body
Implementation Method 2
applies a plurality of alternating currents having different frequencies to the living body
Data Source
AI summary
A measurement device capable of executing measurement processing of impedance of a living body by applying a current to the living body includes three or more electrodes; and a control unit configured to control application of a current, in which the control unit measures the impedance of the living body when a current is applied to the living body for a predetermined plurality of combinations of electrodes constituted by a plurality of electrodes selected from the three or more electrodes, and determines one combination to be used for the measurement processing of impedance of the living body among the predetermined plurality of combinations based on the measured impedance.