Recessed Measuring Electrode Skin Impedance Sensor
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Solution Overview
Problem
Existing skin impedance measurement devices face inaccuracies due to noise issues caused by the sequence of electrode contact with the skin, leading to delayed stabilization of impedance measurements.
Innovation Solution
A sensor design with a measuring electrode recessed relative to a reference and current carrying electrode, utilizing an elastic element or seesaw arm to ensure the measuring electrode contacts the skin after the reference and current carrying electrodes, allowing for improved accuracy by controlling electrode contact sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the M electrode is positioned at the same level as the R and C electrodes, then the electrode structure is simple and easy to manufacture, but the measurement accuracy deteriorates due to noise from improper contact sequences
Solution Approach 1:
The M electrode is positioned asymmetrically recessed relative to the R and C electrodes, creating a hierarchical contact sequence where R and C electrodes contact the skin first, followed by the M electrode. This asymmetric positioning eliminates measurement noise while maintaining structural simplicity.
Solution Approach 2:
The R and C electrodes are designed to contact the skin before the M electrode through the recessed positioning. This preliminary action of establishing current flow path before measurement contact prevents noise and ensures accurate impedance measurement.
2Measurement precision
If the R and C electrodes contact the skin before the M electrode, then the measurement accuracy is improved, but the contact sequence control becomes more difficult
Solution Approach 1:
By recessing the M electrode relative to the R and C electrodes, the patent creates a natural hierarchical contact sequence during skin application. This asymmetric design automatically ensures proper contact timing without requiring complex control mechanisms.
Solution Approach 2:
The recessed electrode structure enables self-controlled contact sequencing through the physical geometry itself. When the sensor is applied to the skin, the protruding R and C electrodes naturally contact first, followed by the recessed M electrode, eliminating the need for external control systems.
3Productivity
If all three electrodes contact the skin simultaneously, then the device operation is simple, but the impedance measurement shows large variations and errors
Solution Approach 1:
The recessed positioning of the M electrode creates a time-differentiated contact sequence despite simultaneous application. The asymmetric geometry ensures R and C electrodes establish contact before the M electrode, enabling fast measurement without sacrificing consistency.
Solution Approach 2:
The R and C electrodes perform preliminary contact with the skin to establish the current flow path before the M electrode makes measurement contact. This preliminary action occurs automatically through the recessed design, enabling rapid yet accurate measurements.
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
Enables instantaneous and accurate measurement of skin impedance by ensuring stable electrode contact sequences, reducing measurement errors and variations.
Implementation Method 1
an elastic element connected to the R electrode and the C electrode, the elastic element to compress when pressure is applied to the R electrode and the C electrode
Implementation Method 2
measuring skin impedance with a sensor having a measuring (M) electrode that is slightly recessed with respect to a reference (R) electrode and a current carrying (C) electrode
Data Source
AI summary
A sensor measuring skin impedance includes a reference electrode, a current carrying electrode, and a measuring electrode for measuring impedance for current flowing between the reference electrode and the current carrying electrode. The measuring electrode is recessed with respect to the reference electrode and the current carrying electrode, allowing the measuring electrode to make contact with a user's skin after the reference electrode and current carrying electrode make contact, resulting in greater measurement accuracy.