Quencher Assembly Reduces Optical Interference in Fluidic Devices
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Solution Overview
Problem
Existing fluidic devices for point-of-care testing face challenges in minimizing interfering optical signals, particularly in luminogenic assays, where excess or unbound enzyme-labeled reagents can react and produce unwanted signals, compromising assay sensitivity.
Innovation Solution
A fluidic device with a quencher assembly that includes a quenching site and a quenching agent, such as 4-amino-1,11-azobenzene-3,4-disulfonic acid, impregnated in absorbent materials like glass fiber or silica, which reduces optical interference by inactivating reagents and absorbing waste liquids, thereby minimizing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all assay components including waste washes are contained in a small housing to enable point-of-care testing, then portability and rapid results are improved, but optical interference from luminogenic waste materials increases
Solution Approach 1:
The patent extracts the harmful luminogenic waste materials from the detection environment by providing separate waste chambers that are optically isolated from the detection site. The waste washes containing unbound enzyme-labeled reagents are directed to dedicated chambers that do not interfere with the optical detection of the assay signal, thereby resolving the contradiction between containing all components in a small housing and preventing optical interference.
Solution Approach 2:
The patent introduces optical barriers and reflective surfaces as intermediary elements between the waste chambers and the detection site. These intermediaries block or redirect stray light from luminogenic waste materials, preventing them from interfering with the detection of the assay signal while maintaining the compact integrated design of the device.
2Reliability
If excess reagents are used to ensure complete analyte binding, then assay reliability is improved, but interfering signals from unbound reagents increase
Solution Approach 1:
The patent extracts unbound excess reagents from the detection environment through separate waste chambers. After the assay reaction, wash steps remove unbound enzyme-labeled reagents and direct them to waste chambers that are optically isolated from the detection site, allowing excess reagents to be used for complete analyte binding without generating interfering signals at the detection location.
3Measurement precision
If luminogenic reagents are used to amplify the assay signal, then measurement sensitivity is improved, but optical interference from reagent reactions increases
Solution Approach 1:
The patent segments the device into functionally distinct zones: a detection site where the assay reaction occurs and generates the desired signal, and separate waste chambers where unbound luminogenic reagents are contained. This spatial segmentation allows the use of highly sensitive luminogenic reagents while preventing the unbound reagents from generating interfering signals in the detection zone.
Solution Approach 2:
The patent introduces optical barriers, reflective surfaces, and absorptive materials as intermediary elements between the waste chambers containing luminogenic reagents and the detection site. These intermediaries block or absorb stray light from unbound reagents, allowing the full benefit of luminogenic signal amplification while eliminating the harmful optical interference.
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
The quencher assembly effectively reduces optical interference by at least 99%, enhancing assay sensitivity and accuracy by eliminating unwanted signals and preventing contamination.
Implementation Method 1
the quencher assembly is adapted to reduce interference of the optical signal by inactivating reagents
Implementation Method 2
a quenching agent, such as 4-amino-1,11-azobenzene-3,4-disulfonic acid, impregnated in absorbent materials like glass fiber or silica
Data Source
AI summary
This invention is in the field of medical devices. Specifically, the present invention provides portable medical devices that allow real-time detection of analytes from a biological fluid. The methods and devices are particularly useful for providing point-of-care testing for a variety of medical applications. In particular, the medical device reduces interference with an optical signal which is indicative of the presence of an analyte in a bodily sample.