Wearable Biopotential Patch with Self-Regulating Moisture Control
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Solution Overview
Problem
Conventional biopotential measurement patches face challenges with battery efficiency, accuracy, adhesion, and comfort, particularly due to the limitations of wet and dry electrodes, which affect long-term monitoring and wearer comfort.
Innovation Solution
A self-regulating patch with a heating element that generates heat to increase skin moisture for accurate measurements and transitions between comfort and accuracy modes based on inferred moisture levels, using a metallic mesh or wire and a logic system to manage moisture levels effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wet electrode with gel is used to reduce contact impedance and improve measurement accuracy, then measurement accuracy is improved, but the electrode can only be used for short periods due to gel dehydration and causes skin irritation
Solution Approach 1:
The patent transitions the electrode from a wet gel-based system to a dry electrode system, fundamentally changing the physical state and composition parameters. The dry electrode eliminates gel dehydration issues while maintaining acceptable contact impedance through optimized metal-skin contact geometry and surface properties.
Solution Approach 2:
The patent employs disposable dry electrodes that are replaced periodically rather than attempting to extend the life of gel-based electrodes. This approach accepts the short-living nature but eliminates the skin irritation and performance degradation issues associated with gel dehydration.
2Duration of action of stationary object
If a dry electrode is used for long-term monitoring to avoid skin irritation, then comfort and usage duration are improved, but contact impedance increases and measurement accuracy decreases
Solution Approach 1:
The patent optimizes the dry electrode's physical parameters including metal surface area, contact pressure, and geometric configuration to achieve adequate electrical coupling without requiring gel. The electrode design compensates for the lack of moisture through increased surface area and optimized contact mechanics.
Solution Approach 2:
The patent uses composite electrode structures combining different metals and surface treatments to optimize both electrical contact properties and skin compatibility. The composite design balances conductivity requirements with mechanical comfort for extended wear.
3Measurement precision
If more moisture is introduced to the skin-electrode interface to improve dry electrode performance, then measurement accuracy is improved, but skin maceration and discomfort occur during prolonged use
Solution Approach 1:
The patent employs moisture-wicking materials that automatically draw excess moisture away from the electrode-skin interface during perspiration. The system self-regulates by transporting moisture laterally through capillary action in the adhesive and substrate layers, preventing accumulation at the critical contact zone.
Solution Approach 2:
The patent introduces moisture-wicking adhesive and substrate materials as intermediaries between the dry electrode and skin. These materials manage the moisture environment by absorbing and transporting perspiration away from the electrode interface, maintaining optimal contact conditions without causing maceration.
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 patch balances comfort and measurement accuracy by adjusting its heating mode to maintain optimal moisture levels, improving contact impedance and reducing skin irritation and discomfort during prolonged use.
Implementation Method 1
a heating element that is operable to generate heat, where the heat causes formation of sweat at the skin surface
Implementation Method 2
an exterior surface enveloping the heating element and the ECG sensor, where the exterior surface is constructed of a material that draws moisture away from the ECG sensor
Data Source
AI summary
The described embodiments relate to a self-regulating patch for taking biopotential measurements and balancing accurate measurements and user comfort. The self-regulating patch including: a heating element operable to generate heat that causes formation of sweat at the skin surface; a biopotential sensor; an exterior surface constructed of a moisture wicking material enveloping the heating element; and a logic to concurrently activate the biopotential sensor and transition the self-regulating patch between a plurality of modes, including a comfort mode and an accuracy mode, where in the comfort mode the heating element is inactive and in the accuracy mode the heating element is active.