Organic Photovoltaic Power for Flexible Sweat Sensors
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Solution Overview
Problem
Existing wearable health monitoring systems face challenges with high power demands, limited battery life, bulkiness, fragility, and inefficiency in continuous monitoring due to high-power requirements and inadequate power sources, particularly for sweat sensors which need large samples and complex fabrication.
Innovation Solution
A self-powered wearable biosensor system using high-efficiency photovoltaic panels, supporting circuitry, and a microfluidic sweat sensor patch that harnesses indoor and artificial light for energy, combined with optional energy harvesting technologies like FTENG and thermionic generators for continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If typical photovoltaic technologies (silicon-based) are used to power wearable devices, then light energy conversion is achieved, but the device becomes fragile, bulky, and rigid
Solution Approach 1:
The patent changes the material parameter from traditional silicon-based PV to organic PV materials, which fundamentally alters the mechanical properties while maintaining photovoltaic functionality. This material substitution enables the device to be flexible and less fragile while still converting light energy effectively
Solution Approach 2:
The invention uses composite material structures combining organic PV materials with flexible substrates and encapsulation layers. This composite approach maintains the light-to-electricity conversion capability while adding flexibility and durability, resolving the contradiction between energy conversion efficiency and mechanical strength
2Power
If typical photovoltaic technologies are used for wearable devices, then power generation is achieved, but the device becomes bulky and rigid
Solution Approach 1:
The patent changes the structural parameters by using thin-film organic PV materials deposited on flexible substrates. This reduces the overall thickness and volume of the power-generating component while maintaining adequate power output for wearable applications
Solution Approach 2:
The invention employs thin-film organic PV structures that can be conformally deposited on flexible substrates. This thin-film approach dramatically reduces the volume and bulkiness of the device while maintaining power generation capability, and enables flexible wearable form factors
3Measurement precision
If existing sweat sensors are designed to provide accurate biomarker analysis, then measurement precision is improved, but the device requires large sample size and high power consumption
Solution Approach 1:
The patent extracts and focuses on measuring only the most critical biomarkers (such as lactate, glucose, or specific electrolytes) rather than analyzing all possible sweat components. This selective measurement approach reduces the complexity and power consumption of the sensor system while maintaining clinical relevance and measurement precision for key health indicators
Solution Approach 2:
The invention employs disposable or replaceable sensor patches that are pre-configured with optimized sensing elements. These single-use sensors eliminate the need for complex calibration and maintenance, reducing the power requirements of the main device while ensuring consistent measurement precision across multiple users and time points
4Duration of action of moving object
If batteries are used to power wearable health monitoring systems, then continuous operation is achieved, but the device gains weight and bulk
Solution Approach 1:
The patent implements self-powered operation where the wearable device generates its own electricity through organic photovoltaic materials that convert ambient light into electrical energy. This self-service power generation eliminates or reduces the need for heavy rechargeable batteries, achieving continuous operation without significant weight increase
Solution Approach 2:
The invention replaces the mechanical/chemical battery system with a photovoltaic energy conversion system. Instead of storing energy chemically in heavy batteries, the device converts light energy directly into electrical energy, substituting one energy storage mechanism with a regenerative energy harvesting approach that reduces weight and bulk
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 continuous monitoring of health indicators over several weeks with stable power supply, reduced sample size requirements, and lightweight, flexible design suitable for long-term wear, overcoming limitations of traditional battery-powered systems.
Implementation Method 1
PV panels include small PV cells fabricated using semiconducting material, such as silicone. When exposed to light, PV cells generate an electric field, converting light energy into electric energy.
Implementation Method 2
powering from human motion
Implementation Method 3
powering from thermionic generators
Data Source
AI summary
Systems and methods for a self-powered wireless wearable sensor system include a photovoltaic (PV) panel array, used as a power source for a wearable sensor. The PV panel array may be attached to an area of the human body exposed to a light source. Exposure to a light source may generate an electric field and power a wearable device sufficiently to support data transmission and continuous monitoring. An integrated self-powered wireless wearable sensor system may include a microfluidic sweat sensor patch that may be connected to lower-power wireless sensor circuitry for regulating power efficiently and may be powered by the PV panel array.