Ferrogel Sensor for Wireless Glucose Monitoring
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Solution Overview
Problem
Current glucose monitoring systems for diabetes management are invasive, prone to infection, require frequent calibration, and have limited durability and accuracy, particularly for continuous and long-term monitoring of glucose levels.
Innovation Solution
A wireless, implantable glucose sensor using a magnetically functionalized hydrogel (ferrogel) that changes thickness in response to glucose levels, altering the inductance of a planar coil and resonant frequency, allowing for continuous, non-invasive monitoring without the need for enzymes or external power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wireless, implantable ferrogel sensor is used for continuous glucose monitoring, then measurement precision and reliability are improved, but device complexity increases due to the need for magnetic particles and laser-scribed structures
Solution Approach 1:
The patent employs ferrogel, a composite material combining hydrogel with magnetic particles (superparamagnetic iron oxide nanoparticles). This composite provides both the glucose-responsive swelling capability of hydrogels and the magnetic detectability needed for wireless sensing, resolving the contradiction by integrating multiple functions into a single material system
Solution Approach 2:
The patent replaces traditional mechanical or electrochemical sensing mechanisms with a magnetic field-based detection system. The ferrogel's swelling response to glucose changes modulates the magnetic field, which is detected wirelessly by an external magnetometer, eliminating the need for complex electrical connections or mechanical moving parts within the implant
2Measurement precision
If invasive glucose monitoring methods are used, then measurement precision is improved, but object-affected harmful factors increase due to infection risk and tissue damage
Solution Approach 1:
The patent uses ferrogel as an intermediary substance that interfaces between the biological environment (where glucose is present) and the detection system (magnetic field). The hydrogel acts as a biocompatible barrier that allows glucose diffusion while protecting the underlying magnetic particles, enabling accurate measurement without direct exposure of sensitive components to tissue
Solution Approach 2:
The ferrogel sensor is designed to be self-powered through the glucose-responsive swelling mechanism. The chemical energy from glucose binding directly drives the physical swelling that modulates the magnetic field, eliminating the need for external power sources, batteries, or electronic circuitry that would require surgical implantation and increase infection risk
3Measurement precision
If traditional glucose sensors with enzymes are used, then measurement precision is improved, but duration of action is limited due to enzyme degradation and calibration requirements
Solution Approach 1:
The patent replaces enzyme-based chemical detection with a physical swelling mechanism. Instead of relying on enzymatic reactions that degrade over time, the ferrogel uses reversible physical binding of glucose to hyaluronic acid, which drives swelling without chemical consumption or degradation, enabling long-term stable operation
Solution Approach 2:
The patent exploits the reversible swelling parameter of the ferrogel in response to glucose concentration changes. This physical parameter change (volume expansion/contraction) directly modulates the magnetic field properties, providing a durable sensing mechanism that does not depend on stable enzyme activity or frequent calibration
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 system provides continuous, accurate glucose monitoring with reduced risk of infection, long-term durability, and improved sensitivity, enabling real-time tracking of glucose fluctuations and trends, enhancing diabetes management and patient safety.
Implementation Method 1
A wireless, implantable glucose sensor using a magnetically functionalized hydrogel (ferrogel) that changes thickness in response to glucose levels, altering the inductance of a planar coil and resonant frequency
Implementation Method 2
These hydrogels may comprise crosslinked polymeric systems, and can be engineered to swell and shrink (de-swell) in response to a variety of physical, chemical, and biological stimuli
Data Source
AI summary
A method of making a sensor includes depositing a layer of hydrogel over a substrate, the hydrogel configured to change thickness or volume in response to a selected condition and including a plurality of magnetic particles disposed in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel. The hydrogel is sacrificed in selected region(s) of the layer so that the hydrogel outside the selected region(s) forms a plurality of spaced-apart islands of the hydrogel. The islands of the hydrogel are enclosed in an enclosure at least partly permeable to a selected fluid. A sensor for detecting a condition includes the substrate, islands, and a device coil arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor. A system includes the substrate, islands, and a magnetic-field detector.