Assay Device Reagent Storage with Releasable Binding

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Solution Overview

Problem

Existing binding assays face challenges in increasing signal from binding events, reducing non-specific binding, and improving measurement accuracy and precision, especially when analyzing complex biological samples.

Innovation Solution

An assay device with a storage zone containing surface-reagent complexes linked via releasable binding interactions, allowing reagents to be selectively released and transferred to use zones for conducting assays, enabling multiplexed analysis of multiple analytes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If binding assays are conducted directly in complex biological samples, then the assay can be performed with minimal sample preparation, but the signal from binding events is reduced and non-specific binding increases

Engineering Contradiction:

Improvesample preparation simplicityVSAvoidsignal detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The invention applies preliminary action by performing pre-concentration of analytes and removal of contaminants from complex biological samples before conducting the binding assay. This preliminary sample preparation step improves signal detection accuracy and reduces non-specific binding, while maintaining relative ease of operation through automated or semi-automated processing protocols

Inventive Principle:

Principle #10Preliminary action

2Duration of action of stationary object

If reagents are stored in stable forms, then the device has longer shelf life and storage stability, but the reagents cannot be released for use without additional steps

Engineering Contradiction:

Improvereagent storage stabilityVSAvoidreagent release mechanism

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The invention uses parameter changes by storing reagents in stable dry or frozen forms and triggering their release through controlled changes in environmental parameters such as temperature (thawing), humidity (rehydration), or pH. This approach maintains long storage stability while enabling relatively simple reagent activation without complex mechanical release mechanisms

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs intermediaries such as protective matrices, carrier substances, or buffer systems that maintain reagent stability during storage and facilitate controlled release when needed. These intermediary substances allow the reagents to transition from stable storage forms to active forms without requiring complex release mechanisms

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If multiple reagents are integrated in a single device, then the assay can perform multiplexed analysis, but the device structure becomes more complex

Engineering Contradiction:

Improvemultiplexed analysis capabilityVSAvoiddevice structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention applies segmentation by dividing the device into distinct functional zones including separate storage zones for different reagents, sample application zones, incubation zones, and detection zones. This segmentation allows multiplexed analysis of multiple analytes while maintaining a relatively simple overall structure through modular zone-based design rather than integrated complex mechanisms

Inventive Principle:

Principle #1Segmentation

4Volume of moving object

If sample volume is reduced for miniaturized assays, then the device size decreases, but the concentration of analytes may be insufficient for detection

Engineering Contradiction:

Improvedevice sizeVSAvoidanalyte concentration

Core Design Contradiction:

Volume of moving objectVSQuantity of substance

Solution Approach 1:

The invention uses local quality by creating localized high-concentration zones through pre-concentration steps in specific regions of the device. Analytes are concentrated from larger volumes into smaller reaction volumes at critical locations, enabling sufficient detection sensitivity while maintaining miniaturized device dimensions. This is achieved through controlled sample loading, filtration, or binding-based concentration in localized zones

Inventive Principle:

Principle #3Local quality

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

Enhances assay performance by pre-concentrating analytes and reducing contaminants, improving signal detection and measurement accuracy in complex samples.

Implementation Method 1

a surface-reagent complex comprising (i) a reagent linked to a first targeting agent; and (ii) a surface linked to a second targeting agent, wherein the reagent and the surface are linked, in the surface-reagent complex, via a releasable binding interaction between the first and second targeting agents

Methodology Applied

Scientific EffectMolecular recognition binding:

Implementation Method 2

the reagent and the surface are linked, in the surface-reagent complex, via a releasable binding interaction between the first and second targeting agents

Methodology Applied

Scientific EffectReversible binding interaction:

Data Source

PatentUS20250334571A1Reagent storage in an assay device

Publication Date: 2025.10.30 MESO SCALE TECH LLC

AI summary

The invention relates to methods for conducting binding assays in an assay device that includes one or more storage and use zone. The storage zones of the assay device are configured to house one or more reagents used in an assay conducted in the use zone of the device.