Low Polarisation Biosensor for Continuous Glucose Monitoring
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Solution Overview
Problem
Existing portable devices for continuous extracellular biological fluid analysis, such as glucose monitoring, face limitations including power dependency, complex maintenance, and inability to perform multiple measurements due to the use of electrochemical transducers requiring significant polarisation voltage and enzymatic reaction cells, which restrict their use for continuous, long-term monitoring of individual patients.
Innovation Solution
A portable device equipped with a disposable measuring cell, a measuring unit, and a remote control unit, utilizing two or three electrode enzymatic biosensors with low polarisation voltage, enabling accurate thermal compensation and error correction, and allowing for extended operation with reduced electrode wear and susceptibility to interferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrochemical transducers with three or more electrodes operating at significant polarisation voltage (over several hundred millivolts) are used for continuous measurements, then measurement capability is achieved, but electrode wear increases and susceptibility to electrochemical interferences increases
Solution Approach 1:
The patent applies parameter changes by reducing the polarisation voltage from several hundred millivolts to only a few millivolts. This fundamental parameter change in the electrochemical measurement system enables continuous monitoring while significantly reducing electrode degradation and interference susceptibility, resolving the contradiction between measurement capability and reliability
2Measurement precision
If electrochemical transducers requiring significant polarisation voltage are used, then electrochemical measurements can be performed, but maintenance complexity and frequency increase
Solution Approach 1:
By changing the operating parameter from high polarisation voltage (hundreds of millivolts) to low polarisation voltage (few millivolts), the patent reduces electrode wear and maintenance requirements, making the system easier to maintain while preserving electrochemical measurement capability
3Adaptability or versatility
If disposable measuring cells with Clark-type sensors are used for single sample measurements, then device adaptability is achieved, but endurance for continuous measurements of dozens of hours is not provided
Solution Approach 1:
The patent resolves this contradiction by changing the polarisation voltage parameter to very low values (few millivolts), which dramatically reduces the rate of electrode consumption. This enables disposable measuring cells to function continuously for dozens of hours, transforming them from single-use to multi-use devices while maintaining adaptability
Solution Approach 2:
The patent applies partial action by using minimal polarisation voltage (only a few millivolts instead of several hundred) sufficient for measurement but excessive reduction that enables extended operation. This partial utilization of the electrochemical potential allows the measuring cell to operate continuously for dozens of hours
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 continuous, accurate measurement of glucose and other analytes for dozens of hours with reduced maintenance and increased flexibility, supporting long-term monitoring of individual patients with improved accuracy and reduced electrode wear.
Implementation Method 1
portable device provided with biosensor for measurement and control of biological fluids such as glucose and other analytes
Implementation Method 2
the possibility of measuring the fluid temperature at the outlet of said electrolytic cell in high resolution mode for diagnostic purposes, hence it can also be used for performing very accurate thermal compensation of the electrochemical measurement
Data Source
Figure 1
AI summary
Portable device for the measurement and control of analytes in biological fluids comprising: one disposable measuring cell (20) suitable for application to the patient's skin, one measuring unit (21) combined with said measuring cell (20) by means of an electro-fluidic wiring (25, 26, 36, 37) and one remote control unit (22) combined with said measuring cell (20) and with said measuring unit (21) and suitable for setting, adjusting and monitoring the measurement.