Analyte Detection via Optical and Impedance Measurements
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Solution Overview
Problem
Current methods for determining analyte concentrations in body fluids, such as glucose, are hindered by interferents like hematocrit, ascorbic acid, and pharmaceuticals, which cause measurement inaccuracies and require complex correction algorithms and electrode materials that can lead to electrode fouling and Faradaic conversions.
Innovation Solution
A method combining optical measurements with impedance measurements using aluminum electrodes, which corrects analyte concentrations for interferents by analyzing alternating electrical signals and applying a failsafe algorithm to ensure accurate results, and employs bare metal electrodes to prevent electroactive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex correction algorithms and specialized electrode materials are used to account for interferents, then measurement accuracy is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent extracts and measures interferent concentrations (hematocrit, ascorbic acid, pharmaceuticals) separately from the analyte measurement using dedicated electrodes. By measuring interferents independently and removing their influence through algebraic subtraction, the system achieves accurate analyte measurements without requiring complex correction algorithms, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent introduces impedance measurement as an intermediary technique to assess interferent levels. The impedance signal serves as a mediator that correlates with interferent concentration, enabling the system to compensate for interferent effects through a simple linear relationship rather than complex algorithms, thereby reducing computational complexity while maintaining measurement accuracy
2Ease of manufacture
If conventional electrode materials are used, then manufacturing is simpler, but electrode fouling and Faradaic conversions occur leading to measurement errors
Solution Approach 1:
The patent changes the measurement parameter from potential-dependent Faradaic reactions to potential-independent impedance measurements. By operating at frequencies where capacitive effects dominate over Faradaic reactions, the system eliminates electrode fouling and Faradaic conversion issues while maintaining ease of manufacture with simple metal electrodes, thus resolving the contradiction between manufacturing simplicity and measurement reliability
3Measurement precision
If impedance measurement is used to correct for interferents, then correction accuracy is improved, but the system requires additional measurement electrodes
Solution Approach 1:
The patent designs impedance electrodes that serve multiple functions: they measure both interferent concentrations and analyte concentrations through a single impedance measurement. This multi-functionality allows the system to achieve accurate interferent correction without adding separate dedicated electrodes for each interferent type, thereby resolving the contradiction between correction accuracy and device complexity
Solution Approach 2:
The patent merges the interferent measurement and analyte measurement functions into a single integrated system. By combining multiple measurement capabilities into one impedance measurement process, the system achieves accurate interferent correction while minimizing the number of required electrodes, thus resolving the contradiction between measurement precision and device complexity
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
This approach provides reliable, simplified correction of analyte concentrations independent of interferent concentrations, reducing measurement errors and manufacturing costs while maintaining high precision and robustness against interferents.
Implementation Method 1
performing at least one impedance measurement, wherein at least two impedance measurement electrodes are used, wherein at least one alternating electrical signal is applied to the body fluid via the impedance measurement electrodes and wherein at least one answer signal is recorded
Implementation Method 2
Impedance measurements at aluminum electrodes typically are not influenced by electro-active drugs in a wide frequency range in aqueous solutions. By passivation of the aluminum surface by an oxide layer, and oxidation or reduction of redox-reactive substances within the electrolyte, typically is not possible
Implementation Method 3
the test chemical is an optical test chemical and is adapted to perform at least one detection reaction in the presence of the analyte, wherein at least one optically detectable property of at least one of the body fluid and the test chemical is changed due to the detection reaction
Data Source
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AI summary
A method for detecting at least one analyte in a body fluid (112) is disclosed. The method comprises the following steps: a) performing an optical measurement, wherein at least one test chemical (120) is contacted with the body fluid (112), wherein the test chemical (120) is an optical test chemical (120) and is adapted to perform at least one detection reaction in the presence of the analyte, wherein at least one optically detectable property of at least one of the body fluid (112) and the test chemical (120) is changed due to the detection reaction, wherein at least one optical measurement value is generated; b) performing at least one impedance measurement, wherein at least two impedance measurement electrodes (130) are used, wherein at least one alternating electrical signal is applied to the body fluid (112) via the impedance measurement electrodes (130) and wherein at least one answer signal is recorded, wherein at least one impedance measurement value is generated; c) performing at least one evaluation step, wherein, in the evaluation step, at least one evaluation algorithm is used, wherein the optical measurement value and the impedance measurement value are used for determining a concentration of the analyte in the body fluid (112).