Biosensor Pressure Compensation for Electrodermal Activity
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Solution Overview
Problem
Conventional biosensors are cumbersome and affect physiological readings due to their presence, and they fail to accurately compensate for pressure and temperature variations, which impact the accuracy of electrodermal activity measurements.
Innovation Solution
A biosensor system with a pair of electrodes and pressure sensing devices, including force sensitive resistors, piezoelectric devices, or pressure sensitive gels, that captures electrodermal activity readings and compensates for pressure and temperature variations using circuitry and firmware to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional biosensors are used to monitor physiological information, then basic measurement functionality is provided, but measurement accuracy deteriorates due to pressure and temperature variations affecting electrodermal activity readings
Solution Approach 1:
The patent implements feedback by using pressure sensors to detect applied pressure on the electrodes and temperature sensors to detect skin temperature. These detected values are fed back to a processor that calculates compensation values based on predetermined relationships between pressure/temperature and electrodermal activity. The compensation values are then applied to correct the raw electrodermal activity readings, forming a closed-loop feedback system that continuously adjusts for environmental variations.
Solution Approach 2:
The patent applies parameter changes by utilizing predetermined relationships (lookup tables or mathematical models) that define how electrodermal activity varies with pressure and temperature. The processor retrieves or calculates compensation values based on these parameter relationships and applies them to adjust the measured electrodermal activity readings, effectively changing the measurement parameters to account for environmental effects.
2Ease of operation
If biosensors are made portable and wearable, then ease of operation improves, but device complexity increases due to the need for multiple sensing components and compensation circuitry
Solution Approach 1:
The patent merges multiple sensing functions into a single integrated sensor module. The electrodermal activity electrodes, pressure sensors, and temperature sensors are combined in one compact module that can be easily attached to the body. This integration reduces the number of separate components the user must handle and simplifies the attachment process while maintaining all necessary sensing and compensation capabilities.
Solution Approach 2:
The sensor module is designed with multi-functionality, serving as both an electrodermal activity monitor and an environmental condition sensor (pressure and temperature). The same device structure supports multiple sensing functions, making it a universal monitoring unit that can operate in various conditions without requiring separate specialized devices for each measurement type.
3Stability of the object's composition
If stationary biosensors are used, then measurement stability is maintained, but ease of operation deteriorates due to cumbersome setup and user awareness effects
Solution Approach 1:
The patent compensates for stability issues caused by movement and positioning changes by measuring pressure and temperature parameters and using them to correct electrodermal activity readings. The compensation algorithm accounts for variations in electrode-skin contact conditions caused by movement, maintaining reading stability even when the sensor is worn during physical activity rather than being stationary.
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
The system provides accurate and reliable physiological monitoring by compensating for pressure and temperature effects in real-time, enhancing the accuracy of electrodermal activity readings and skin temperature measurements.
Implementation Method 1
The one or more pressure sensing devices may include one of a group comprising force sensitive resistors, piezoelectric devices, piezoelectric polymers
Implementation Method 2
The one or more pressure sensing devices may include one of a group comprising force sensitive resistors
Implementation Method 3
circuitry to evaluate electrodermal activity of skin to which the pair of electrodes contacts
Data Source
AI summary
A biosensor is described which can obtain physiological data from an individual. The biosensor may collect electrodermal activity, skin temperature, and other information. The biosensor may be attached to the body through the use of a garment which may be fastened in multiple locations on the human body. The biosensor includes compensation for electrodermal activity measurements based on the amount of pressure applied to the electrodes that are in contact with the skin. As pressure is increased the electrodermal activity values typically increase. By compensating for the influence that pressure changes have on electrodermal activity, more accurate analysis of physiology and therefore mental state analysis may be performed.