Centrifugal Microfluidic Nucleic Acid Processing for Portable DNA Analysis

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Solution Overview

Problem

Forensic DNA extraction methods are inefficient, requiring large sample volumes and complex valving, limiting portability and multiplexed amplification, and result in significant reagent waste.

Innovation Solution

A portable centrifugal microfluidic device integrating reagent storage, nucleic acid liberation, multiplexed PCR amplification, and electrophoretic separation for rapid nucleic acid analysis, using a Pe-toner microdevice with a centrifugal platform and dual Peltier spinning system for efficient heating and cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If conventional solid phase extraction is used, then DNA extraction is achieved, but sample volume efficiency is poor and reagent waste is significant

Engineering Contradiction:

Improvereagent wasteVSAvoidsample volume efficiency

Core Design Contradiction:

Loss of substanceVSProductivity

Solution Approach 1:

The device segments the extraction process into distinct functional zones (lysis chamber, binding chamber, washing chambers, elution chamber) that operate sequentially, allowing precise control of reagent application to small sample volumes while maintaining extraction efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from conventional bulk liquid handling to microfluidic channel-based transport, utilizing capillary action and surface tension effects to move small volumes of sample and reagents through defined paths, dramatically reducing reagent consumption while improving sample utilization

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Quantity of substance

If microfluidic devices are used, then sample volume is reduced, but device complexity and portability are limited

Engineering Contradiction:

Improvesample volumeVSAvoidvalving complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The device employs passive fluid handling mechanisms including capillary wicking, surface tension-based flow control, and gravity-driven transport that eliminate the need for complex active valving systems, pumps, or external control mechanisms, thereby reducing device complexity while maintaining portability

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention replaces mechanical valving and pumping systems with physicochemical phenomena (capillary action, surface tension, hydrophobic/hydrophilic surface properties) to control fluid flow, significantly simplifying the device architecture and enabling portable operation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If conventional extraction instruments are used, then DNA extraction is achieved, but portability is limited

Engineering Contradiction:

Improveextraction reliabilityVSAvoidportability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The device merges multiple extraction steps (lysis, binding, washing, elution) and detection capabilities into a single integrated microfluidic platform, eliminating the need for large conventional instruments while maintaining extraction reliability through controlled fluid handling and standardized protocols

Inventive Principle:

Principle #5Merging (Combining)

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

Enables efficient use of small sample volumes, reduces reagent waste, and facilitates rapid, portable DNA analysis with high throughput and accuracy, suitable for forensic applications.

Implementation Method 1

a portable device for rapid nucleic acid analysis is provided by integrating technologies on a single centrifugal microfluidic device

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 2

dual Peltier spinning system for efficient heating and cooling

Methodology Applied

Scientific EffectPeltier effect: Peltier Effect

Implementation Method 3

electrophoretic separation on the same centrifugal device

Methodology Applied

Scientific EffectElectrophoresis: Electrophoresis

Data Source

PatentUS12551888B2Devices and methods for extraction, separation and thermocycling

Publication Date: 2026.02.17 UNIV OF VIRGINIA PATENT FOUND

AI summary

A method to extract, amplify and separate nucleic acid in a microfluidic device having a plurality of chambers and channels can include a) introducing cells having nucleic acid to a first chamber of the microfluidic device and subjecting the cells in the first chamber to conditions that lyse the cells. The method can further include b) subjecting the first chamber to centrifugal force, thereby allowing the lysate or a portion thereof having nucleic acid to be distributed to a second chamber through a first channel in the microfluidic device. The method can also include c) combining the lysate or the portion thereof and reagents for amplification of the nucleic acid, thereby providing a second mixture. The method can also include d) subjecting the second chamber to centrifugal force, thereby allowing gas to be expelled from the second mixture.