Silicon Photonics Implantable Glucose Sensor
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Solution Overview
Problem
Current implantable glucose sensors face stability and reliability issues due to fouling by proteinaceous materials, limiting their use for long-term continuous monitoring, which is crucial for effective glycemic control in diabetes management.
Innovation Solution
A miniaturized, reagent-free, optical sensor system using a silicon photonics integrated circuit with an integrated radiation processor and detection element, allowing for spectrally resolved measurements without the need for forced substance extraction, thereby minimizing bio-fouling and enhancing mechanical stability and patient comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface chemical reaction-based implantable glucose sensors are used, then measurement accuracy and sensitivity are improved, but sensor stability and reliability deteriorate due to proteinaceous material fouling after a few days
Solution Approach 1:
The patent replaces surface chemical reaction-based sensing with optical spectroscopy-based sensing. The optical sensor uses light absorption at specific wavelengths (2.3 μm VCSEL and detector) to measure glucose concentrations without direct chemical contact, eliminating the protein fouling issue that plagues surface-based sensors while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces an optical intermediary (light) between the sensor and glucose molecules. Instead of direct chemical interaction, the sensor uses optical absorption properties of glucose to detect concentrations, allowing measurement without physical contact that would cause fouling.
2Reliability
If frequent or continuous glucose monitoring is implemented, then glycemic control effectiveness is improved, but cost and patient burden increase
Solution Approach 1:
The patent describes a implantable sensor system that performs continuous glucose monitoring autonomously. The sensor automatically measures glucose concentrations multiple times per day without requiring patient intervention, eliminating the need for manual test strip application and providing continuous data for effective glycemic control.
Solution Approach 2:
The patent replaces manual test strip-based monitoring with an automated implantable optical sensor system. The VCSEL-based sensor continuously measures glucose levels without requiring patient action, reducing both cost and complexity compared to frequent manual testing.
3Ease of operation
If implantable sensor size is reduced for better patient comfort, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent describes a planar waveguide-based optical sensor design that integrates multiple functions in a two-dimensional plane. The sensor uses a flat waveguide structure with input and output ports, allowing miniaturization while maintaining optical performance and simplifying manufacturing compared to three-dimensional optical paths.
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 solution enables continuous, accurate monitoring of glucose levels with reduced bio-fouling, improved reliability, and the potential for long-term implantation, supporting effective glycemic control and reducing medical costs.
Implementation Method 1
A miniaturized, reagent-free, optical sensor system using a silicon photonics integrated circuit with an integrated radiation processor and detection element, allowing for spectrally resolved measurements
Implementation Method 2
the integrated radiation processor is integrated in a silicon photonics integrated circuit and configured for spectrally processing radiation interacting with the glucose or urea or lactate
Data Source
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Figure 2B~3
Figure 4~5
AI summary
A sensor is described for sensing a substance such as for example glucose. The sensor is implantable in the body of a living creature. The sensor comprises a photonic integrated circuit, e.g. silicon-photonics, based radiation processor for spectrally processing radiation interacting with the sample. A continuous monitoring system also is described using such a sensor.