Multiplexed Transdermal Glucose Sensor Array
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Solution Overview
Problem
Existing non-invasive glucose monitoring devices face challenges such as variable dilution factors due to large skin areas, requiring frequent calibration and operating close to their limits of detection, especially during hypoglycemia, which limits their effectiveness and commercial success.
Innovation Solution
A multiplexed transdermal extraction and detection system using a miniaturized iontophoretic sampling device with an array of sensor pixels that target preferential pathways in the skin, allowing for semi-continuous or continuous monitoring of glucose levels without the need for finger-stick calibration, by employing graphene-based electrodes and platinum nanoparticles for enhanced detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large skin area is used for transdermal extraction, then the detection limit is improved, but the dilution factor becomes variable and calibration is required
Solution Approach 1:
The patent divides the sensing area into multiple independently addressable sensor pixels arranged in an array. Each pixel can be individually activated to sample from a specific location, enabling selective sampling while maintaining overall detection sensitivity. This segmentation allows the system to achieve both improved detection limits through multiple pixels and reduced dilution factor variability by selecting specific sampling locations.
2Quantity of substance
If a large skin area is used for transdermal extraction, then more substance is extracted, but the device requires frequent calibration
Solution Approach 1:
By segmenting the sensing area into multiple pixels, the system can extract substance through multiple parallel pathways simultaneously, increasing the total quantity extracted. The multiplexed readout capability allows data from multiple pixels to be combined, enhancing the overall signal while maintaining consistent extraction characteristics that reduce calibration needs.
Solution Approach 2:
The patent employs graphene-based electrodes and platinum nanoparticles to enhance detection sensitivity, allowing the system to detect lower concentrations of analytes. This parameter change in detection sensitivity means that frequent calibration is no longer necessary even when extracting larger quantities of substance through multiple pixels.
3Ease of operation
If miniaturized sensor pixels are used to target preferential pathways, then calibration-free monitoring is achieved, but the detection sensitivity may be reduced
Solution Approach 1:
The patent creates an array of miniaturized sensor pixels that can be individually addressed. While each pixel is small, the collective array provides sufficient detection sensitivity by combining signals from multiple pixels. The ability to selectively activate specific pixels allows the system to maintain calibration-free operation while achieving the required detection sensitivity through signal aggregation.
Solution Approach 2:
The use of graphene-based electrodes combined with platinum nanoparticles creates a composite material structure that significantly enhances detection sensitivity. This composite approach allows miniaturized pixels to achieve sensitivity levels comparable to or exceeding larger traditional sensors, thereby maintaining both the calibration-free advantage and the required 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 clinically relevant, non-invasive glucose monitoring with reduced variability in dilution factors, improved sensitivity, and the ability to detect glucose levels across a wide range without calibration, enhancing the accuracy and reliability of glucose monitoring.
Implementation Method 1
transdermal extraction and detection of substances, such as glucose via reverse iontophoresis
Implementation Method 2
selective sampling of interstitial and biological fluids
Implementation Method 3
electrochemically detected
Data Source
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AI summary
Multiplexed transdermal extraction and detection devices and systems for non-invasive monitoring of substances, such as glucose, are disclosed, as are methods of using these devices for substance monitoring in subjects.