Centrifugal Micro-Fluidic Device for Analyte Detection
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Solution Overview
Problem
Conventional centrifugal micro-fluidic devices for analyte detection face challenges in sensitivity due to insufficient reaction efficiency, requiring large amounts of labeling reagents and experiencing competitive inhibition and reagent wastage, with single-direction fluid flow limiting quantitative analysis.
Innovation Solution
A centrifugal micro-fluidic device incorporating a rotational body with multiple chambers and channels, utilizing both capillary and centrifugal forces to enhance fluid flow and reaction efficiency, featuring a reaction chamber for signal generator-analyte complex formation and an analysis chamber with porous membranes or micro-pillars for improved detection, allowing repeated fluid flow cycles for enhanced sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-direction fluid flow is used in conventional centrifugal micro-fluidic devices, then device complexity is reduced, but reaction efficiency and detection sensitivity deteriorate
Solution Approach 1:
The patent implements periodic bidirectional fluid flow by alternating centrifugal force application. The fluid flows forward during centrifugal rotation, then reverses when centrifugal force is removed or reversed. This periodic back-and-forth motion enhances reaction efficiency by repeatedly bringing reactants into contact, solving the contradiction between simple device structure and high reaction efficiency.
2Measurement precision
If large amounts of labeling reagent are used to ensure complete analyte combination, then detection sensitivity is improved, but reagent cost and waste increase
Solution Approach 1:
The bidirectional fluid flow creates continuous reaction cycles where unreacted analyte and labeling reagent are repeatedly circulated through the reaction zone. This continuous action ensures complete reaction without requiring excess reagents, resolving the contradiction between detection sensitivity and reagent waste by achieving thorough mixing and reaction through repeated passes rather than reagent surplus.
3Reliability
If un-combined analyte combines with capture binder on test line, then competitive inhibition occurs, but this is unavoidable in single-pass systems
Solution Approach 1:
The periodic bidirectional flow allows multiple reaction opportunities. Uncombined analyte that initially misses the signal generator is repeatedly exposed to it during subsequent flow cycles. This increases the probability of successful binding before the fluid reaches the test line, reducing competitive inhibition and improving detection accuracy without sacrificing reaction completeness.
4Productivity
If detectable signal generator is excessively re-lysed at early stage, then reagent efficiency decreases, but this occurs naturally with constant volume flow
Solution Approach 1:
The bidirectional periodic flow controls re-lysis timing by alternating between release and binding phases. During centrifugal flow, signal generator is released and combines with analyte. When flow reverses, uncombined signal generator returns to the reaction zone for another opportunity rather than being wasted. This periodic control optimizes reagent utilization while maintaining detection sensitivity.
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 results in a 2-fold increase in reaction time and significantly improved analyte detection sensitivity by enabling repeated reaction cycles, reducing reagent wastage and competitive inhibition, and optimizing the interaction between the signal generator and capture binder.
Implementation Method 1
a repeated flow of the liquid specimen induced by both capillary force and centrifugal force
Implementation Method 2
a repeated flow of the liquid specimen induced by both capillary force and centrifugal force
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A centrifugal micro-fluidic device detecting analytes in a liquid specimen and a method of detection of analytes from a liquid specimen using the micro-fluidic device are provided. Reaction efficiency is increased using a repetitive flow of the liquid specimen induced by an alternating combination of capillary force and centrifugal force, thereby enhancing detection sensitivity.