Microfluidic Particle Sorting With Passive Fluid Extraction

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Solution Overview

Problem

Micro-scale particle sorting and filtration devices face limitations in fluid handling capacity (low throughput) and require complex moving components, making them less efficient than macro-scale systems.

Innovation Solution

The use of carefully controlled geometries and dimensions in microfluidic devices that combine fluid extraction with inertial lift forces to sort and shift particles, allowing for high-throughput sorting and filtration without complex components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If micro-scale techniques are used for particle sorting and filtration, then device size and complexity are reduced, but fluid handling capacity (throughput) is limited

Engineering Contradiction:

Improvedevice complexityVSAvoidfluid handling capacity

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The microfluidic channel is segmented into multiple parallel channels, allowing simultaneous processing of multiple fluid streams. This increases the overall fluid handling capacity while maintaining the compact micro-scale design, as each parallel channel contributes to the total throughput independently

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple microfluidic channels are arranged in a nested or integrated configuration within a single device footprint. This allows the device to handle larger fluid volumes by combining the capacity of multiple channels while maintaining a compact overall device size

Inventive Principle:

Principle #7Nested doll (Nesting)

2Productivity

If macro-scale techniques are used for particle sorting and filtration, then fluid handling capacity is improved, but device size and complexity increase

Engineering Contradiction:

Improvefluid handling capacityVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Mechanical moving components (such as pumps, valves, and actuators) are replaced with passive microfluidic structures and hydrodynamic forces. The device uses carefully controlled geometries and inertial lift forces to achieve particle sorting without requiring complex mechanical systems, thereby maintaining high throughput while reducing device complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The device utilizes hydrodynamic effects and fluid pressure gradients to drive particle sorting and filtration. By leveraging hydraulic principles and inertial forces within the microfluidic channels, the system achieves macro-scale throughput capability without requiring macro-scale mechanical components

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Quantity of substance

If fluid extraction is applied to sort particles, then particle concentration is maintained, but fluid flow patterns become complex

Engineering Contradiction:

Improveparticle concentrationVSAvoidfluid flow patterns

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

Fluid extraction is applied locally at specific positions within the microfluidic channel rather than uniformly throughout. This localized extraction creates controlled flow patterns that maintain particle concentration in the main stream while allowing selective particle sorting at extraction points, simplifying the overall flow pattern management

Inventive Principle:

Principle #3Local quality

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 high-throughput sorting and filtration with maintained particle concentration, enabling scalable and cost-effective systems for particle separation and fluid manipulation.

Implementation Method 1

Fluid is extracted from the first microfluidic channel into the second microfluidic channel through gaps between island structures

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

As the particles reach nearer to the island structures, the particles experience an inertial lift force away from the direction of fluid extraction such that the particles remain in the first channel

Methodology Applied

Scientific EffectInertial lift force: Inertia

Implementation Method 3

As the fluid from the other adjacent channel enters the first channel, the particles within the first channel cross fluid streamlines, resulting in the shift of the particles from the first fluid to the second fluid

Methodology Applied

Scientific EffectStreamline crossing: Advection

Data Source

PatentUS12427521B2Sorting particles in a microfluidic device

Publication Date: 2025.09.30 THE GENERAL HOSPITAL CORP

AI summary

A microfluidic device includes a particle sorting region having a first, second and third microfluidic channels, a first array of islands separating the first microfluidic channel from the second microfluidic channel, and a second array of islands separating the first microfluidic channel from the third microfluidic channel, in which the island arrays and the microfluidic channels are arranged so that a first fluid is extracted from the first microfluidic channel into the second microfluidic channel and a second fluid is extracted from the third microfluidic channel into the first microfluidic channel, and so that particles are transferred from the first fluid sample into the second fluid sample within the first microfluidic channel.