Interference Rejection Membranes for Amperometric Sensors
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Solution Overview
Problem
Conventional amperometric glucose sensors face interference from substances like acetaminophen and ascorbic acid, leading to spurious signals due to overlapping oxidation or reduction potentials, complicating sensor manufacturing and accuracy.
Innovation Solution
Development of interference rejection membranes (IRMs) using polymers like polyvinyl alcohol and poly(2-hydroxyethyl methacrylate) formed via light-mediated polymerization, allowing selective deposition on sensor electrodes to block interfering species, and employing a dual-working electrode configuration for signal characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference rejection membranes are selectively coated on certain areas of sensor electrodes, then sensor accuracy is improved by blocking interfering species, but device complexity increases due to selective coating requirements
Solution Approach 1:
The patent applies local quality by forming interference rejection membranes with different properties in different locations on the sensor electrode. The selective area coating creates regions with distinct functionality: one region blocks interfering species while another allows analyte access, enabling both interference rejection and analyte detection on the same electrode surface
Solution Approach 2:
The patent segments the electrode surface into multiple functional regions by selectively coating different areas with interference rejection membranes. This segmentation allows the electrode to perform multiple functions simultaneously - detecting analytes in uncoated regions while rejecting interferents in coated regions, thereby improving measurement precision without requiring separate electrodes
2Object-affected harmful factors
If conventional IRM formulations are used, then interference rejection is achieved, but manufacturing difficulty increases due to inability to control deposition locations
Solution Approach 1:
The patent changes the chemical parameters of the IRM formulation by incorporating photoinitiators and using specific polymer compositions that can be selectively polymerized. This allows control over where and when the membrane forms, enabling precise deposition on selected electrode areas while maintaining effective interference rejection properties
Solution Approach 2:
The patent applies preliminary action by first coating the entire electrode surface with a precursor layer containing polymerizable monomers and photoinitiators, then selectively polymerizing this layer in specific areas using light exposure. This preliminary coating followed by selective activation simplifies manufacturing compared to attempting direct selective coating
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
Enhances sensor accuracy by reducing interference from non-target substances, simplifies manufacturing by enabling precise IRM placement, and improves patient compliance monitoring through better signal tracking.
Implementation Method 1
the interference rejection membrane is formed by a reaction mixture comprising a polymerizable monomer, a crosslinking agent and a photoinitiator agent; and the interference rejection membrane is cured when the reaction mixture is polymerized by exposure to light
Implementation Method 2
the IRMs are crosslinked in situ, for example by a diacrylate crosslinking agent
Implementation Method 3
Interference rejection membranes (IRMs) are used in amperometric analyte sensors to prevent interferents such as acetaminophen and ascorbic acid from contacting working electrodes
Data Source
AI summary
Embodiments of the invention provide amperometric analyte sensors having optimized elements such as interference rejection membranes, and associated architectures, as well as methods for making and using such sensors. While embodiments of the innovation can be used in a variety of contexts, typical embodiments of the invention include glucose sensors used in the management of diabetes.