Microchannel Grooves Induce Microvortices for Particle Capture

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Solution Overview

Problem

Current microfluidic devices face challenges in efficiently capturing particles, such as cells, without relying on external energy sources, as passive manipulation methods are limited in effectiveness, especially in scaling up to high-throughput systems.

Innovation Solution

Incorporating grooves into the micro-channel walls of microfluidic devices that induce microvortices in the fluid flow, enhancing particle interactions with the channel walls through helical flows, and using adherents like antibodies or aptamers to capture specific particles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If passive manipulation methods are used to capture particles in microfluidic devices, then device complexity is reduced and no external energy sources are needed, but particle capture efficiency is limited

Engineering Contradiction:

Improvedevice complexityVSAvoidparticle capture efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The invention introduces curved grooves with specific radii of curvature into the microchannel walls. These curved features generate helical flow patterns and microvortices that enhance particle-wall interactions, thereby improving capture efficiency without adding external energy sources or complex active manipulation components.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The invention utilizes hydraulic flow through specially designed grooves to generate microvortices and helical flow patterns. By optimizing groove geometry (depth, width, angle, spacing), the system leverages the kinetic energy of the flowing fluid itself to create enhanced mixing and particle capture, eliminating the need for external actuators.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Use of energy by moving object

If passive manipulation methods are used without external energy sources, then energy consumption is reduced, but particle capture efficiency deteriorates

Engineering Contradiction:

Improveenergy consumptionVSAvoidparticle capture efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The system is designed to utilize the kinetic energy already present in the flowing fluid to generate the necessary microvortices and helical flow patterns. The groove geometry is optimized so that the fluid flow itself creates the conditions for enhanced particle capture, making the system self-sufficient without external energy input.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention optimizes multiple geometric parameters of the grooves (depth, width, angle, spacing, radius of curvature) to maximize the conversion of fluid kinetic energy into effective microvortices. By carefully tuning these parameters, the system achieves high particle capture efficiency using only the energy inherent in the fluid flow.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If groove geometry is optimized to enhance microvortices, then particle capture efficiency is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveparticle capture efficiencyVSAvoidgroove geometry precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The invention identifies critical groove parameters that have the most significant impact on microvortex generation and particle capture. By focusing manufacturing precision on these critical parameters while allowing tolerances on less critical dimensions, the system achieves high capture efficiency without requiring extreme precision across all groove features.

Inventive Principle:

Principle #16Partial or excessive action

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 increases particle capture efficiency, reduces energy consumption, and decreases reagent costs by promoting transverse movement of particles towards the channel walls, enabling efficient capture and culture of live cells without the need for external energy sources.

Implementation Method 1

Incorporating grooves into the micro-channel walls of microfluidic devices that induce microvortices in the fluid flow

Methodology Applied

Scientific EffectMicrovortex: Vortex Ring

Implementation Method 2

enhancing particle interactions with the channel walls through helical flows

Methodology Applied

Scientific EffectHelical flow:

Implementation Method 3

affinity-based particle capture in microfluidic devices... an adherent applied to at least one wall to selectively attach an analyte of interest

Methodology Applied

Scientific EffectAffinity-based binding: Adsorption

Data Source

PatentUS10126218B2Capturing particles

Publication Date: 2018.11.13 THE GENERAL HOSPITAL CORP

AI summary

Methods and systems capturing particles suspended in a fluid flowed through a micro-channel, can include flowing the fluid including the particles to be captured through a micro-channel and past a groove defined in a surface of a wall of the micro-channel such that flowing the fluid past the groove forms microvortices in the fluid; contacting at least some of the particles against an adherent disposed on one or more of walls of the microchannel after the microvortices form in the fluid; and capturing at least some of the particles contacting the adherent.