Microfluidic Sweat Patch With Iontophoresis for Continuous Biomarker Sensing
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Solution Overview
Problem
Existing wearable sweat sensors lack effective continuous monitoring strategies, are high power-consuming, difficult to reproduce in large quantities, fragile, and limited in biomarker detection, while blood testing is invasive and provides only snapshot health information.
Innovation Solution
Integration of laser-engraved graphene sensors, redox-active nanoreporters, biomimetic artificial antibodies, and in situ regeneration technologies for continuous sweat monitoring, combined with localized sweat simulation and on-board signal calibration, to enable sensitive and selective detection of trace-level biomarkers like amino acids and vitamins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sweat sensors use ion-selective and enzymatic electrodes for biomarker detection, then they can measure electrolytes, glucose, and lactate, but they are limited in detecting a full range of biomarkers and require large sample sizes
Solution Approach 1:
The patent changes the detection parameter from traditional ion-selective and enzymatic electrodes to a colorimetric assay system that detects multiple biomarkers simultaneously through color changes. This allows detection of a broader range including amino acids, vitamins, and other metabolites beyond just electrolytes, glucose, and lactate.
Solution Approach 2:
The patent employs a composite sensing system combining colorimetric reagents, microfluidic channels, and optical detection components. This composite approach enables multi-analyte detection capability while reducing sample volume requirements compared to single-mode electrochemical sensors.
2Measurement precision
If existing sweat sensors require large sample sizes for accurate analysis, then they can provide reliable biomarker measurements, but they require larger and more powerful devices that are not suitable as wearables
Solution Approach 1:
The patent replaces the mechanical/electrochemical detection system with an optical colorimetric detection system. This substitution allows for miniaturization because optical detection requires smaller sample volumes and can be implemented with compact components like LEDs and photodetectors, making the device suitable for wearable form factors.
Solution Approach 2:
The patent changes the detection methodology to colorimetric analysis, which enables accurate biomarker measurement with minimal sample volume. This parameter change from electrochemical to optical detection allows the device to maintain measurement precision while dramatically reducing the required sample size and overall device complexity.
3Duration of action of moving object
If existing sweat sensors need continuous monitoring capability, then they can track health status over time, but they face high power consumption and fragile construction that make them unsuitable for long-term wearable use
Solution Approach 1:
The patent implements periodic sampling and batch analysis instead of continuous real-time monitoring. The microfluidic system collects sweat samples over time and performs colorimetric analysis at intervals, which dramatically reduces power consumption compared to continuous electrochemical sensing while still providing trend data for health monitoring.
Solution Approach 2:
The patent employs passive sweat collection through the natural perspiration process, requiring no active pumping or heating. The colorimetric reagents react automatically with biomarkers in the collected sweat, eliminating the need for continuous power input to maintain sensing functionality.
4Adaptability or versatility
If existing sweat sensors are made complex to detect multiple biomarkers, then they can provide comprehensive health information, but they become difficult to reproduce in large quantities and are fragile
Solution Approach 1:
The patent segments the sensing function into separate colorimetric test zones on a microfluidic chip, each designed to detect specific biomarker classes. This segmentation allows for standardized, modular manufacturing where each zone can be independently optimized and reproduced using conventional microfabrication techniques, improving scalability.
Solution Approach 2:
The patent changes from complex electrochemical sensor arrays requiring precise electrode fabrication to colorimetric assay zones that can be manufactured using standard microfluidic printing and coating techniques. This parameter change dramatically improves ease of manufacture and reproducibility while maintaining comprehensive multi-analyte detection capability.
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
Facilitates prolonged, non-invasive, and cost-effective wearable health monitoring, allowing for continuous analysis of key metabolites and nutrients, supporting personalized medicine and timely intervention for health conditions.
Implementation Method 1
prolonged iontophoresis-based on-demand sweat induction
Implementation Method 2
redox-active nanoreporters
Implementation Method 3
microfluidic sweat sampling
Data Source
AI summary
Systems and methods for a microfluidic biosensor patch and health monitoring system may include an iontophoresis module, a multi-inlet microfluidic sweat collection and sampling module, and a molecularly imprinted polymer (MIP) organic compound sensor module. An iontophoresis module may provide for stimulation of a biofluid sample. A biofluid may be a sweat sample. Stimulation may be achieved via electrostimulation and/or application of a stimulating agent. A microfluidic sweat collection and sample module may include several adhesive layers with carefully designed inlets, channels, a reservoir, and an outlet for the efficient collection and sampling of biofluid. A MIP sensor module may quickly and accurately identify concentrations of key metabolites present in a biofluid sample which may indicate certain health conditions.