Magnetic Assay Device Bound Unbound Reagent Separation
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Solution Overview
Problem
Current assay devices face challenges in distinguishing bound from unbound labeled reagents to accurately determine analyte concentration, requiring complex methods and high sample volumes, which hinders patient compliance and device simplicity.
Innovation Solution
The use of magnetically susceptible labels and optical labels forming tertiary or binary complexes, subjected to a magnetic field, allows for differentiation based on velocity, enabling the detection of analyte presence through distinct optical signals, and subsequent concentration calculation using electronic filtering and autocorrelation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional assay methods are used to distinguish bound from unbound labeled reagents, then measurement precision can be achieved, but device complexity and sample volume requirements increase
Solution Approach 1:
The assay method segments the detection process by spatially separating bound and unbound labeled reagents through magnetic field manipulation. The magnetic field causes bound complexes to move to a detection zone while unbound reagents remain in a different zone, allowing independent measurement of each population and simplifying the overall detection methodology.
Solution Approach 2:
A magnetic field is introduced as an intermediary mechanism to manipulate and separate the labeled reagents. The magnetic field acts as a mediator that selectively moves magnetically susceptible labels containing bound analyte, enabling physical separation without complex chemical or mechanical separation systems.
2Measurement precision
If conventional assay methods are used to distinguish bound from unbound labeled reagents, then measurement precision can be achieved, but the sample volume required increases
Solution Approach 1:
The detection volume is segmented into distinct zones (bound reagent zone and unbound reagent zone) within the assay device. This spatial segmentation allows the system to analyze analyte concentration using a smaller total sample volume by focusing measurements on specific localized regions rather than requiring large volumes for bulk analysis.
Solution Approach 2:
The system changes the physical state and position of the labeled reagents through magnetic field application. By transforming the distribution of labeled reagents from a mixed homogeneous state to a spatially separated state, the system achieves precise measurement in smaller sample volumes.
3Device complexity
If magnetically susceptible labels are used to separate bound and unbound reagents, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The magnetically susceptible labels self-organize and self-separate in response to the applied magnetic field. The bound labeled reagents automatically migrate to the detection zone while unbound reagents remain elsewhere, eliminating the need for complex mechanical positioning systems or precision-aligned manufacturing features.
Solution Approach 2:
The patent replaces mechanical or chemical separation mechanisms with a magnetic field-based separation system. This substitution simplifies the device structure by eliminating complex mechanical moving parts or precision-engineered separation channels, relying instead on the magnetic properties of the labels for automatic separation.
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 method provides high sensitivity and low-volume detection of analytes, simplifying the assay device manufacturing and user operation, while accurately determining analyte concentrations with reduced sample volume requirements.
Implementation Method 1
The mixture is subjected to a magnetic field sufficient to move the tertiary complexes at a velocity different from (e.g., at a higher velocity than) optical labels not in a tertiary complex
Implementation Method 2
The optical labels are configured to form tertiary complexes with the analyte. First time-varying optical signals are received from optical labels in tertiary complexes and second time-varying signals are received from free optical labels
Data Source
Figure 1~2
Figure 3A~4B
Figure 5
AI summary
An assay device includes a first reagent including a magnetic particle and a second reagent including detectable component. The first and second reagent can each independently bind to an analyte in a sample. A time-varying magnetic field can be used to distinguish detectable components that are associated with analyte from detectable components not associated with analyte.