Microdevice Light Blocker for Fluorescence Immunoassay Sensitivity

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Solution Overview

Problem

Conventional fluorescence polarization immunoassays using microdevices suffer from low measurement sensitivity due to fluorescent light emitted by both bound and free fluorescence-labeled derivatives, which complicates the detection of measurement target substances.

Innovation Solution

A microdevice design featuring a microchannel with an antibody fixed to its sidewall and a light blocker that absorbs excitation light, preventing it from reaching fluorescence-labeled derivatives bound to the antibody, while allowing unbound derivatives to emit fluorescent light, thereby enhancing sensitivity by suppressing fluorescence from bound derivatives.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If fluorescent light is detected from both bound and free fluorescence-labeled derivatives, then the measurement can be performed, but measurement sensitivity is low

Engineering Contradiction:

Improvemeasurement sensitivityVSAvoiddetection complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the harmful signal component by introducing a light blocker that selectively blocks excitation light from reaching bound fluorescence-labeled derivatives. This allows only free derivatives to emit detectable fluorescent light, thereby improving measurement sensitivity by removing the interfering signal from bound complexes.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The light blocker is positioned specifically at the sidewall surface of the microchannel where bound derivatives are located, creating a local differentiation in optical properties. This localized blocking approach ensures that only the specific region containing bound derivatives is affected, while allowing free derivatives in the bulk solution to remain detectable.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If a light blocker is introduced to block excitation light for bound derivatives, then measurement sensitivity is improved, but device structure becomes more complex

Engineering Contradiction:

Improvemeasurement sensitivityVSAvoidmicrodevice structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The light blocker is merged with the microchannel sidewall structure, integrating the blocking function into the existing microchannel geometry rather than adding a separate, independent component. This merging approach improves measurement sensitivity while minimizing the increase in device structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If antibodies are fixed to sidewall surfaces to enable specific binding, then measurement precision is improved, but light blocking effect is enhanced

Engineering Contradiction:

Improvespecific binding capabilityVSAvoidexcitation light reaching bound derivatives

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the potentially harmful effect of the light blocker into a beneficial measurement mechanism. By blocking excitation light to bound derivatives, the system creates a selective detection mechanism where only free derivatives contribute to the signal, transforming the blocking function into an advantage for improving measurement precision.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 design improves measurement sensitivity by selectively blocking excitation light from bound fluorescence-labeled derivatives, allowing only free derivatives to emit light, which correlates with the concentration of the measurement target substance, thus enhancing detection precision.

Implementation Method 1

a light blocker blocking excitation light exciting fluorescent light radiated by the fluorescence-labeled derivative

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

excitation light exciting fluorescent light radiated by the fluorescence-labeled derivative

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS12066435B2Microdevice and analysis device

Publication Date: 2024.08.20 TIANMA JAPAN LTD

AI summary

A microdevice includes: a microchannel to which a measurement target solution containing a measurement target substance is introduced; an antibody being fixed to at least one sidewall surface of the microchannel and specifically binding to the measurement target substance; a fluorescence-labeled derivative being specifically bound to the antibody and being acquired by fluorescence-labeling the measurement target substance; and a light blocker blocking excitation light exciting fluorescent light radiated by the fluorescence-labeled derivative. The measurement target substance and the fluorescence-labeled derivative specifically bind to the antibody in a competitive manner, and the antibody is fixed to the sidewall surface of the microchannel in a state of specifically binding to the fluorescence-labeled derivative. The light blocker blocks the excitation light entering the fluorescence-labeled derivative specifically binding to the antibody.