Ferrogel Sensor for Wireless Glucose Monitoring
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Solution Overview
Problem
Current glucose monitoring systems for diabetes, such as transcutaneous glucose electrodes and continuous glucose monitors, face challenges like infection, enzyme denaturation, frequent calibration, short lifespan, and inability to provide continuous, reliable, and waterproof monitoring, leading to missed fluctuations in blood glucose levels.
Innovation Solution
A wireless, implantable sensor using a hydrogel configured to change thickness or volume in response to glucose levels, with magnetic particles that alter magnetic properties, allowing for continuous monitoring without an external power source or mechanical connection, utilizing a device coil and magnetic-field detector to modulate electrical properties and measure resonant frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transcutaneous glucose electrodes are used for continuous monitoring, then glucose level monitoring capability is improved, but risk of infection and enzyme denaturation increases
Solution Approach 1:
The patent introduces a ferrogel as an intermediary layer between the biological environment and the sensing elements. This ferrogel contains magnetic particles and functional molecules that mediate the interaction with glucose, protecting the enzyme from direct exposure to harmful factors while maintaining sensing capability. The ferrogel acts as a protective barrier that allows glucose diffusion but shields the embedded enzymes from denaturation and infection risks.
Solution Approach 2:
The patent employs composite materials combining ferrogel with magnetic particles, enzymes, and functional polymers. This composite structure integrates multiple functions: the ferrogel provides a protective matrix, magnetic particles enable wireless actuation and sensing, and enzymes provide glucose-specific detection. The composite nature allows simultaneous achievement of continuous monitoring, protection from harmful factors, and wireless operation.
2Reliability
If conventional sensors with mechanical connections and power sources are used, then monitoring function is achieved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent replaces mechanical connections and traditional power sources with wireless electromagnetic field-based actuation and sensing. Magnetic particles embedded in the ferrogel respond to external magnetic fields for actuation, eliminating the need for mechanical connectors. The sensing is achieved through wireless detection of magnetic property changes, removing the need for electrical feedthroughs and complex wiring.
Solution Approach 2:
The ferrogel-based sensor system is self-powered through the interaction between the magnetic particles and external magnetic fields. The system utilizes the magnetic properties of the ferrogel itself for both actuation and sensing functions, eliminating the need for separate power sources. The hydrogel's natural swelling and shrinking responses provide the sensing mechanism without requiring external power for signal generation.
3Reliability
If hermetically sealed sensors are used to protect against aqueous environments, then reliability is improved, but electrical feedthrough complexity increases
Solution Approach 1:
The patent eliminates the need for hermetic sealing and electrical feedthroughs by replacing electrical sensing mechanisms with magnetic property detection. The ferrogel's magnetic properties change in response to glucose-induced swelling, and these changes are detected wirelessly through external magnetic field interactions. This substitution removes the requirement for electrical connections that would penetrate the protective barrier.
4Measurement precision
If frequent calibration is required for accurate measurement, then measurement precision is improved, but loss of time and ease of operation worsen
Solution Approach 1:
The patent implements continuous monitoring through the ferrogel's ongoing interaction with glucose in the biological environment. The magnetic particles continuously respond to glucose-induced swelling, providing uninterrupted sensing without periodic interruption for calibration. The system maintains continuous measurement capability through the persistent magnetic property changes as the ferrogel dynamically responds to varying glucose levels.
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 sensor provides continuous, reliable, and long-term glucose monitoring with reduced risk of infection, no need for frequent calibration, and ability to operate underwater, offering improved management of glucose levels and reducing the risk of hypoglycemic episodes.
Implementation Method 1
a hydrogel configured to change thickness or volume in response to the condition
Implementation Method 2
a plurality of magnetic particles arranged in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel
Implementation Method 3
a device coil arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor
Data Source
AI summary
A sensor for detecting a condition includes a hydrogel configured to change thickness or volume in response to the condition. Magnetic particles are arranged in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel. Some such sensors include a magnetic-field detector that measures the magnetic field of the hydrogel. Other such sensors include a device coil is arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor. A sensing system using such a sensor includes a reader spaced apart from the sensor and including a reader coil and a resonance detector coupled to the reader coil to detect a the resonant frequency of the sensor. Changes in the magnetic property detectably modulate the resonant frequency.