Microfluidic Channel Barriers for Vortex-Enhanced Biomolecule Capture

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Solution Overview

Problem

Current methods for analyzing biomolecules in microfluidic systems suffer from low extraction efficiency due to low Reynolds number flow, leading to limited mixing and low capture rates of biomolecules by capturing structures.

Innovation Solution

A fluid manipulation system with microfluidic channels that incorporate vortex-inducing barriers, such as chevron or herringbone shapes, combined with arrays of biomolecule-capturing pillars to enhance interaction and residence time of biomolecules, using silica pillars and magnetic beads for improved adsorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional microfluidic channels are used, then the device structure is simple, but the mixing efficiency and biomolecule capture rate are low due to low Reynolds number flow

Engineering Contradiction:

Improvebiomolecule capture rateVSAvoidmicrofluidic channel structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The microfluidic channel is segmented into multiple sections with barriers distributed throughout, creating discrete mixing zones rather than a single continuous channel. This segmentation increases biomolecule-capturing surface area and interaction opportunities while maintaining overall structural simplicity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Barriers are added as a third dimensional element within the planar microfluidic channel, creating vertical obstacles that induce vortex flow patterns. This dimensional addition transforms laminar flow into rotational flow without requiring complex multi-layer structures.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If vortex-inducing barriers are added to enhance mixing, then the biomolecule capture rate increases, but the device complexity increases

Engineering Contradiction:

Improvemixing efficiencyVSAvoidmicrofluidic channel structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Barriers are designed with curved or angled surfaces rather than straight vertical walls, creating asymmetric flow separation that generates stronger vortex patterns. The curved geometry naturally induces rotational flow that enhances mixing efficiency.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The barriers are positioned asymmetrically within the channel and have asymmetric cross-sections, creating uneven flow distribution that promotes chaotic advection and enhanced mixing. This asymmetric design breaks the symmetry of laminar flow patterns.

Inventive Principle:

Principle #4Asymmetry

3Productivity

If barriers are added to increase residence time, then the extraction efficiency improves, but the channel length and device complexity increase

Engineering Contradiction:

Improveextraction efficiencyVSAvoidchannel length

Core Design Contradiction:

ProductivityVSLength of moving object

Solution Approach 1:

Multiple barriers are distributed periodically along the channel length, creating a series of vortex zones that sequentially enhance mixing and extraction. This periodic arrangement allows compact design with shorter overall channel length while maintaining high extraction efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The barriers are nested within the existing channel cross-section rather than extending the channel length, utilizing the available vertical and lateral space to create vortex zones without increasing the device footprint or channel length.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

The system increases biomolecule capture rates and mixing efficiency, allowing for more effective separation and analysis of biomolecules, such as DNA and RNA, in a smaller and less complex microfluidic device.

Implementation Method 1

Barriers in a microfluidic channel... induce vortices in the fluid flow

Methodology Applied

Scientific EffectVortex: Vortex Ring

Implementation Method 2

arrays of biomolecule-capturing pillars to enhance interaction and residence time of biomolecules, using silica pillars and magnetic beads for improved adsorption

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS12522815B2Barriers in microfluidic channels

Publication Date: 2026.01.13 HEWLETT PACKARD DEVELOPMENT COMPANY LP

AI summary

In one example in accordance with the present disclosure, a fluid manipulation system is described. The fluid manipulation system includes a microfluidic channel through which fluid is to flow. The fluid includes biomolecules to be separated. The fluid manipulation system also includes at least one array of biomolecule-capturing pillars disposed within the microfluidic channel to capture biomolecules from the fluid. Barriers rise from a surface of the microfluidic channel. The barriers span a width of the microfluidic channel orthogonal to a flow of the fluid to induce vortices in the fluid flow.