GSR Electrode Array with Multi-Distance Segmentation
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Solution Overview
Problem
Existing galvanic skin resistance (GSR) measurement systems face challenges in accurately measuring pain levels due to variations in skin dryness and conductivity, leading to either undetectable changes or signal saturation across individuals.
Innovation Solution
The GSR electrode array is designed with a scaffold featuring an active electrode and multiple inactive electrodes positioned at different predetermined distances, allowing for customization to accommodate individual skin dryness and length differences, and includes additional elements like resistors, capacitors, and piezoelectric sensors to enhance measurement accuracy and provide defibrillation and electrostatic discharge protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the active and inactive electrodes is enlarged, then the sensitivity to changes in measurements is increased, but the resistance to current flow between the electrodes increases
Solution Approach 1:
The patent divides the single inactive electrode into multiple inactive electrodes positioned at different distances from the active electrode. This segmentation allows the system to select the optimal electrode configuration based on skin conductivity conditions, resolving the contradiction between sensitivity and resistance by providing multiple measurement paths with different characteristics.
Solution Approach 2:
The patent changes the parameter of electrode distance by providing multiple inactive electrodes at different predetermined distances. The system dynamically selects which inactive electrode to use based on measured skin conductivity, thereby adjusting the effective distance parameter to optimize both sensitivity and resistance for each individual subject.
2Reliability
If the distance between the active and inactive electrodes is reduced, then the resistance to current flow between the electrodes is reduced, but the sensitivity to changes in the measurements is impaired
Solution Approach 1:
The patent segments the measurement system into multiple electrode pairs with different distances, allowing selection of the appropriate pair based on whether low resistance or high sensitivity is the priority for the current measurement conditions.
Solution Approach 2:
The system dynamically adjusts which inactive electrode is used based on real-time skin conductivity measurements. This dynamic adaptation allows the system to optimize the balance between resistance and sensitivity for each individual subject rather than being fixed at a single distance.
3Measurement precision
If additional sensors and elements are added to the electrode array, then the ability to reduce misdetection and increase specificity is improved, but the device complexity increases
Solution Approach 1:
The patent integrates multiple sensors (PPG, accelerometer, temperature) into a single multi-functional probe that can perform various physiological measurements. This universal approach allows one device to address multiple sources of measurement error simultaneously, improving specificity without proportionally increasing complexity.
Solution Approach 2:
The system uses feedback from multiple sensors to continuously monitor and adjust measurements. For example, temperature sensors detect skin temperature changes that may affect GSR readings, and accelerometers detect movement that may cause artifacts. This feedback mechanism allows the system to compensate for various confounders and improve measurement accuracy.
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 configuration enables precise compensation for inter-personal differences in skin conductivity, improving the sensitivity and reliability of GSR measurements while preventing signal disruption from electrostatic discharges, thus providing more accurate pain level assessments.
Implementation Method 1
Determination of skin conductance is typically based on measurements obtained from an active electrode configured to induce an electrical signal such as an electrical current, and an inactive electrode configured to collect the electrical signal
Implementation Method 2
at least one element selected from a resistor, a capacitor, a piezoelectric sensor, a thermistor, a solenoid diode, or any combination thereof
Data Source
AI summary
Electrode array for monitoring of physiological parameters and devices including or utilizing same, the electrode array including an active electrode configured to provide an electrical signal and at least two inactive electrodes configured to collect the electrical signal transferred from the active electrode, wherein each of the at least two inactive electrodes are positioned at a different predetermined distance from the active electrode.