Combined Detection Control Zone for Liquid Flow Assays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid flow assays require separate control zones for distinguishing positive and negative samples, which are not applicable to all types of analytes, especially haptens, and involve complex manufacturing processes for each analyte type.
Innovation Solution
A combined detection and control zone in a test strip or sheet using two labelled reagents with detectably distinguishable labels, where at least one reagent becomes immobilized independently of the analyte, allowing for differentiation of positive and negative samples through distinct label signals in a single zone, applicable to various analytes including haptens, antigens, and antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control zones are used to distinguish positive and negative samples, then detection reliability is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent combines the detection zone and control zone into a single integrated zone. The detection zone contains immobilised capture reagent for analyte detection, while the control zone contains immobilised control reagent for quality control. Both zones are merged into one functional unit where labelled reagents can be captured and detected together, eliminating the need for separate physical zones while maintaining detection reliability.
Solution Approach 2:
The combined detection and control zone serves multiple functions simultaneously: it detects the presence of target analyte, provides quality control verification, and enables distinction between positive and negative samples all within a single zone. This multi-functional design reduces device complexity while maintaining or improving detection reliability through integrated functionality.
2Manufacturing precision
If separate control zones are provided for each analyte type, then assay specificity is improved, but manufacturing precision and production complexity increase
Solution Approach 1:
The combined detection and control zone is designed as a universal platform that can detect multiple different analyte types (haptens, antigens, antibodies) using the same zone structure. The zone contains both capture reagent and control reagent that work together for any analyte, eliminating the need to manufacture separate control zones for each analyte type and significantly simplifying production.
Solution Approach 2:
Within the combined zone, the patent segments the functionality into distinct reagent components: immobilised capture reagent for analyte-specific detection and immobilised control reagent for quality control. This segmentation allows each reagent to be optimised for its specific function while being manufactured together in a single zone, improving both manufacturing precision and ease of manufacture.
3Ease of manufacture
If a single combined zone is used for detection and control, then ease of manufacture is improved, but the ability to distinguish positive and negative samples may be compromised
Solution Approach 1:
The patent uses detectably distinguishable labels with different colors or signal characteristics for the capture reagent and control reagent. When the labelled reagent binds to the capture reagent in the presence of analyte, it produces a distinct color change or signal pattern that differs from when it binds to the control reagent. This allows clear visual or instrumental distinction between positive and negative samples within the single combined zone.
Solution Approach 2:
The combined detection and control zone employs local quality differentiation by positioning specific reagents in particular locations within the zone or by using reagents with different binding characteristics. The capture reagent and control reagent are designed to interact with the labelled reagent in different ways, producing locally distinct signals that enable precise sample distinction while maintaining ease of manufacture through a unified zone structure.
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 enables universal detection of analytes in a single assay format, eliminating the need for separate control zones and allowing for the use of identical strips for multiple analytes, enhancing assay performance and simplifying manufacturing by providing distinct signals for both positive and negative samples.
Implementation Method 1
at least one of said labelled reagents becoming immobilised throughout the detection zone independently of the presence of target analyte through a specific binding reaction with an immobilised reagent
Implementation Method 2
liquid flow is transverse to the plane of the test sheet or more preferably may take the form of lateral flow assays in which liquid sample permeates along a test strip or sheet comprising porous material
Data Source
AI summary
The invention relates to liquid flow assays widely applicable to target analytes, including haptens, which employ a detection zone which is a single combined analyte detection and control zone in a test strip or sheet and two labelled reagents with detectably distinguishable labels, preferably with visually contrasting colored particle labels, whereby both negative and positive samples are distinguishable by detection of different captured label signals in the detection zone.