Assay Well Feature Pattern for Signal Consistency
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Solution Overview
Problem
Conventional assay substrates, such as microtiter plates, suffer from signal variability and well-to-well inconsistency due to the meniscus effect and dynamic movement during biochemical analyses, leading to inaccurate and unreliable test results in medical diagnostic techniques like ELISA.
Innovation Solution
The method involves printing analysis features along the bottom of the well in a pattern with a shape similar to the well's cross-sectional shape, such as oval or circular patterns, ensuring uniform exposure to fluid and reducing signal variability by positioning features far enough from the well edge to account for the meniscus effect and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If analysis features are printed in a conventional grid pattern, then the assay substrate can be manufactured with standard processes, but signal variability and well-to-well inconsistency occur due to the meniscus effect and dynamic movement
Solution Approach 1:
The patent applies asymmetry by transitioning from a conventional symmetric grid pattern to an asymmetric circular pattern of analysis features. This circular arrangement is specifically designed to compensate for the meniscus effect and dynamic movement during assays, ensuring uniform fluid exposure and consistent signal generation across all features, thereby improving reliability while maintaining manufacturability
Solution Approach 2:
The patent implements local quality by positioning analysis features at specific radial distances from the well center, where each feature experiences different fluid dynamics. The circular pattern ensures that features at equivalent radial positions have similar fluid exposure, creating localized uniformity that compensates for overall well-to-well variability and improves measurement reliability
2Quantity of substance
If analysis features are positioned close to the well edge, then more features can be accommodated in each well, but signal variability increases due to the meniscus effect
Solution Approach 1:
The patent applies parameter changes by optimizing the radial distance of analysis features from the well center and adjusting the circular pattern dimensions. This parameter optimization ensures features are positioned far enough from the well edge to minimize meniscus effects while maintaining sufficient feature density for accurate measurements, thereby improving measurement precision without significantly reducing the quantity of analytes that can be detected
3Device complexity
If conventional grid patterns are used, then manufacturing is straightforward, but coefficient of variation remains high (greater than 5%) due to well-to-well variability
Solution Approach 1:
The patent transforms the conventional symmetric grid pattern into an asymmetric circular pattern that specifically addresses well-to-well variability. This circular arrangement ensures uniform fluid distribution and consistent feature-substrate interactions, reducing coefficient of variation to less than 5% while maintaining reasonable device complexity through the use of a simple circular geometry rather than complex multi-dimensional patterns
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 assay sensitivity, accuracy, and precision, reducing coefficient of variation to less than 5%, thereby increasing throughput and reliability of biochemical analyses by ensuring consistent interaction of features with the fluid.
Implementation Method 1
signal variability and well-to-well variability in the separate wells can decrease the accuracy and reliability of test results
Data Source
AI summary
Systems and methods are disclosed for enhancing the consistency of performance of assays, such as multiplexed assays, by printing features in a particular pattern, such that the outer edge of the pattern has a shape that is substantially similar to the shape of the test well. For example, the pattern is a ring pattern, such that the outer edge of the ring pattern is circular or oval along the bottom of multiplexed wells. The assay substrates prepared according to the methods described result in more accurate, precise, and sensitive chemical and/or biological analyses.