Finger-worn EDA Sensor for Continuous Perspiration Biomarker Sampling
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Solution Overview
Problem
Existing biofeedback devices are limited by their short-term applications and inability to continuously monitor physiological data, particularly due to user discomfort and inefficiencies in perspiration sampling, which hinders long-term biometric data collection and analysis.
Innovation Solution
A multichannel finger sensor system incorporating EDA and biosensors with wireless data connection and energy storage, utilizing electrodermal response to activate chemical assays without artificial stimulation, enabling continuous long-term data collection and analysis on a mobile device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If iontophoresis is used to stimulate eccrine glands for perspiration sampling, then sufficient fluid is obtained for biosensor analysis, but user discomfort increases and battery life is greatly reduced
Solution Approach 1:
The patent extracts the beneficial electrodermal response signal from natural perspiration events without requiring artificial stimulation. By monitoring spontaneous EDR peaks that occur naturally during user activity, the system obtains perspiration samples without applying electrical current, thereby eliminating user discomfort while maintaining the ability to collect sufficient fluid for analysis.
Solution Approach 2:
The system leverages the user's own natural perspiration production and electrodermal response to the sampling process itself. When perspiration naturally occurs, the EDR peak automatically triggers the sampling sequence, making the system self-activating without external stimulation. This eliminates the need for iontophoresis while ensuring sufficient fluid is available when naturally produced.
2Quantity of substance
If iontophoresis is used to stimulate eccrine glands, then perspiration is produced for analysis, but the latency period increases and battery consumption rises
Solution Approach 1:
The system operates in periodic cycles, continuously monitoring EDA signals and automatically triggering sampling when natural EDR peaks occur. This periodic monitoring approach captures perspiration events as they naturally occur without artificial delay, eliminating the latency associated with iontophoresis activation while maintaining efficient battery usage through event-driven operation.
3Measurement precision
If multiple biometric sensors are integrated for continuous monitoring, then accurate physiological assessment is achieved, but device complexity increases
Solution Approach 1:
The patent merges EDA sensing and biosensor functionality into an integrated system where both sensors share common signal processing and control architecture. The EDA sensor and biosensor are combined such that the EDR peak detection automatically triggers the biosensor sampling sequence, creating a unified multichannel system that achieves accurate physiological assessment without proportionally increasing complexity.
Solution Approach 2:
The EDA sensor serves multiple functions: it continuously monitors sympathetic nervous system activity, detects perspiration events through EDR peaks, and triggers the biosensor sampling sequence. This multi-functionality allows the system to achieve comprehensive physiological monitoring with a single sensor platform, reducing overall system complexity while maintaining measurement precision.
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 accurate, continuous monitoring of physiological states and chemical biomarkers over extended periods, reducing user discomfort and improving data collection efficiency while eliminating the need for electrical current injection and artificial gland stimulation.
Implementation Method 1
measure changes in skin impedance indicative of SNS activation
Implementation Method 2
a biosensor configured to assay specified biomarkers from perspiration of the user
Data Source
AI summary
A wearable biometric sensing ring apparatus for continuous heart rate and blood pressure monitoring having a ring housing for retention on a finger of a user, an electrodermal activity (EDA) sensor disposed within the housing so as to contact a location of the skin of the finger when the housing is retained on the finger, the EDA sensor configured for measuring changes in skin impedance indicative of SNS activation; a biometric sensor disposed within the housing in proximity to the EDA sensor so as to contact at or near the location of the skin of the finger. Application software is provided for assessing the physiological state of the user based on acquired EDA sensor data and biometric sensor data.