Skin Conductivity Measurement Using Frequency Segmentation
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Solution Overview
Problem
Existing skin hydration and lipid measurement devices are inaccurate due to their reliance on conductivity measurements that are influenced by both water and lipid levels, leading to inconsistent results when measuring identical hydrated skin patches.
Innovation Solution
A system and method using at least two electrodes to generate electrical signals at specific frequencies, measuring conductivity, and determining water or lipid levels based on the frequency-dependent sensitivity to either water or lipid content, allowing for more accurate measurements by distinguishing between the two components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conductivity measurements are used to determine skin hydration levels, then the measurement process is simple, but the measurement precision deteriorates because conductivity depends on both water and lipid levels
Solution Approach 1:
The patent segments the measurement process by using multiple frequency measurements to separately determine lipid content and water content. Instead of using a single conductivity measurement that conflates both components, the system performs distinct measurements at different frequencies to isolate and quantify each component independently, thereby resolving the interference between lipid and water effects on conductivity
Solution Approach 2:
The patent changes the measurement parameter from a single conductivity value to multiple frequency-dependent conductivity values. By measuring skin impedance at different frequencies (typically low frequency for lipid content and high frequency for water content), the system transforms the single-parameter measurement into a multi-parameter measurement that can distinguish between lipid and water contributions to overall conductivity
2Device complexity
If single frequency conductivity measurements are used, then the device complexity is low, but the measurement precision deteriorates due to inability to distinguish water and lipid contributions
Solution Approach 1:
The patent introduces dynamic measurement by varying the frequency of the applied electrical signal during measurement. Instead of using a fixed frequency, the system dynamically adjusts the frequency to match the characteristic response frequencies of different skin components (lipids at low frequency, water at high frequency), enabling selective measurement of each component's contribution to overall skin properties
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 precise determination of skin hydration and lipid levels, reducing inaccuracies and providing a more reliable assessment of skin health and condition.
Implementation Method 1
measuring a conductivity between the at least two electrodes
Implementation Method 2
determining a water or lipid level of skin based on the measured conductivity and the frequency of the electrical signal
Data Source
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AI summary
There is provided a system (100) and method for determining a water or lipid level of skin. The system (100) comprises at least two electrodes (108) suitable for contacting skin, and a signal generator (106) configured to generate an electrical signal at a frequency across the at least two electrodes (108). The system (100) is configured to measure a conductivity between the at least two electrodes (108). The system (100) is further configured to determine a water or lipid level of skin based on the measured conductivity and the frequency of the electrical signal.