Magnetic Immunosensor Trench Configuration for Rapid Troponin I Detection
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Solution Overview
Problem
Current laboratory immunoassay tests for analytes require trained technicians and sophisticated instruments, making them costly and time-consuming, which can be detrimental in critical situations like myocardial infarction diagnosis, and there is a need for improved sensitivity for early detection of analytes such as cardiac troponin I.
Innovation Solution
A magnetic immunosensing device with magnetically susceptible beads and a high-field magnet is used to perform real-time or near real-time analysis, where the beads are localized and retained near microfabricated electrodes, enabling efficient detection of analytes in biological samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory immunoassay tests are performed using traditional methods, then measurement precision is maintained, but loss of time increases and device complexity increases
Solution Approach 1:
The patent replaces manual mechanical operations with automated magnetic field-based bead manipulation. Magnetic beads are used to automatically capture, concentrate, and transfer analytes to the sensor surface, eliminating the need for manual sample handling, mixing, and positioning steps while maintaining measurement precision and reducing test time
Solution Approach 2:
The patent introduces magnetic beads as intermediary carriers that mediate between the liquid sample and the solid sensor surface. These beads bind to analytes in solution and are then magnetically directed to the sensor, facilitating efficient mass transfer and enabling rapid detection without compromising analytical accuracy
2Measurement precision
If laboratory immunoassay tests are performed using traditional methods, then measurement precision is maintained, but device complexity increases
Solution Approach 1:
The patent employs magnetic beads that can perform multiple functions: they serve as analyte capture agents, concentration vehicles, and transport carriers all in one component. This multi-functionality reduces the need for separate specialized instruments for each step, simplifying the overall device complexity while maintaining measurement precision
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, gradient, direction) to control bead behavior throughout the assay process. By modulating the magnetic field rather than using complex mechanical mechanisms, the system achieves precise control over bead positioning and analyte concentration with simpler device architecture
3Measurement precision
If sensitivity is increased for low level analyte detection, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent creates localized high-concentration zones of analyte-bound magnetic beads at the sensor surface through magnetic field gradients. This local concentration effect enhances sensitivity for low-level analyte detection by focusing the analytical signal in a specific region, rather than requiring complex instrumentation across the entire system
Solution Approach 2:
The patent uses composite magnetic beads that combine magnetic materials with functional coating layers for analyte binding. These composite structures enable both efficient magnetic manipulation and high-affinity analyte capture, achieving enhanced sensitivity without requiring complex sensor structures or multiple separate components
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 enhances the sensitivity of immunoassays, particularly for low levels of cardiac troponin I, reduces user error, and allows for point-of-care diagnostics with rapid results, improving patient outcomes in critical situations.
Implementation Method 1
a permanent high-field magnet for directing and retaining at least a portion of said beads in said plurality of trenches
Data Source
AI summary
The present invention provides apparatus and methods for the rapid determination of analytes in liquid samples by immunoassays incorporating magnetic capture of beads on a sensor capable of being used in the point-of-care diagnostic field.