Subcutaneous Glucose Sensor Using Lectin Competitive Binding
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Solution Overview
Problem
Current glucose monitoring methods for diabetic patients require frequent blood withdrawals, causing discomfort and are not suitable for long-term use, as they rely on blood glucose measurements which need to be taken multiple times a day, and existing glucose sensing technologies using subcutaneous fluid measurements face challenges with stability and toxicity of lectins like Concanavalin A.
Innovation Solution
A sensor using a competitive binding assay with an animal lectin, such as mannose-binding lectin (MBL), and an analyte analogue that competes with glucose for binding sites, generating a measurable optical signal through fluorescence resonance energy transfer (FRET), which is stable for at least 10 days and does not require blood withdrawal, allowing for continuous monitoring of glucose levels in subcutaneous fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrochemical biosensors or calorimetric test strips are used for glucose monitoring, then glucose measurement can be achieved, but frequent blood withdrawal is required causing patient discomfort and making long-term monitoring impractical
Solution Approach 1:
The invention extracts the glucose sensing function from blood-based measurement and relocates it to subcutaneous fluid measurement. The sensor is implanted in the subcutaneous space where it continuously monitors glucose levels in interstitial fluid, eliminating the need for repeated blood withdrawals while maintaining measurement accuracy through the competitive binding assay mechanism
Solution Approach 2:
The invention introduces subcutaneous fluid as an intermediary medium between blood glucose and the sensor. Instead of directly measuring blood glucose, the sensor measures glucose in subcutaneous fluid which correlates with blood glucose levels, thereby avoiding direct blood contact and lancet insertion while providing indirect but accurate glucose monitoring
2Measurement precision
If Concanavalin A lectin is used in subcutaneous glucose sensors, then glucose detection is achieved, but stability and toxicity issues arise limiting long-term use
Solution Approach 1:
The invention changes the key parameter of lectin selection from Concanavalin A to mannose-binding lectin (MBL). This parameter change addresses both stability and toxicity concerns while maintaining glucose detection capability, as MBL is naturally present in human serum and exhibits superior stability in the subcutaneous environment over extended periods
Solution Approach 2:
The invention moves away from using Concanavalin A which requires frequent sensor replacement due to stability and toxicity limitations. By using MBL, the sensor achieves long-term stability without requiring regular replacement, making the system suitable for continuous long-term monitoring rather than short-term disposable use
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 a reliable and stable means for monitoring glucose levels over an extended period without the need for blood withdrawal, offering improved comfort and accuracy for diabetic patients by using a stable and non-toxic lectin like MBL, enabling frequent glucose measurements that can help in managing diabetes effectively.
Implementation Method 1
generating a measurable optical signal through fluorescence resonance energy transfer (FRET)
Data Source
AI summary
A sensor for the detection or measurement of carbohydrate analyte (such as glucose) in fluid comprises components of a competitive binding assay the readout of which is a detectable or measurable optical signal (such as FRET assay) retained by a material that permits diffusion of analyte but not the assay components, the assay components comprising: an animal lectin; and an analyte analogue capable of competing with analyte for binding to the lectin.