Microfluidic Droplet Microvortices for Cell Interaction Control

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Solution Overview

Problem

Current microfluidic devices lack the ability to control cell-cell interactions at scale, particularly in terms of cell pairing position and interaction frequency, limiting the sensitivity and complexity of cell-cell interaction studies.

Innovation Solution

A microfluidic device with specialized trapping arrays comprising pillars separated by gaps, which induces well-defined and periodic microvortices within cell-laden droplets, allowing for control of cell dynamics and cell-cell distances through orbiting and self-rotation, enabling precise modulation of cell interactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If droplet-based compartmentalization is used for single-cell analysis, then throughput is improved, but the ability to control cell pairing position and interaction frequency deteriorates

Engineering Contradiction:

ImprovethroughputVSAvoidcontrol of cell pairing position and interaction frequency

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The device segments cells into individual droplets for compartmentalized analysis while maintaining the ability to control interactions within each droplet through microvortex generation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic control of cell interactions through externally actuated microvortices that can modulate cell pairing position and interaction frequency within droplets, transforming a static droplet system into a dynamically controllable one

Inventive Principle:

Principle #15Dynamics

2Quantity of substance

If conventional co-culturing is used for cell-cell interaction studies, then quantity of interactions is improved, but sensitivity and complexity of studies deteriorates due to lack of control

Engineering Contradiction:

Improvequantity of cell-cell interactionsVSAvoidsensitivity and complexity of cell-cell interaction studies

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The device divides the co-culturing system into many individual droplet compartments, each containing controlled cell pairs, enabling both high quantity of interactions and precise control over interaction parameters

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each droplet creates a localized microenvironment with specific cell pairing conditions, allowing different interaction scenarios to be studied simultaneously across multiple droplets with high precision

Inventive Principle:

Principle #3Local quality

3Ease of operation

If hydrodynamic traps are used to bring cells into close contact, then cell interaction is improved, but device complexity and fabrication difficulty increases

Engineering Contradiction:

Improvecell interaction controlVSAvoidfabrication complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The microvortices are generated passively through the geometry of the trapping array and flow conditions, without requiring external active elements, allowing the system to self-regulate cell interaction dynamics

Inventive Principle:

Principle #25Self-service

4Productivity

If high-density trap arrays are used for high-throughput screening, then throughput is improved, but ability to modulate cell-cell interactions at scale deteriorates

Engineering Contradiction:

Improvehigh-throughput screening capabilityVSAvoidability to modulate cell-cell interactions

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The trapping array design provides a universal platform that simultaneously achieves high-throughput screening and modifiable cell interactions through flow-controlled microvortices, serving multiple functions in a single device

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 control of cell dynamics and cell-cell interactions, allowing for detailed analysis of cell morphology and signaling without external active elements, enhancing the study of specific real-time interactions and biomechanics within isolated compartments.

Implementation Method 1

The continuous flow of carrier oil may induce one or more microvortices within the one or more cell-laden droplets at the one or more trapping arrays

Methodology Applied

Scientific EffectHydrodynamic forces:

Implementation Method 2

modulating the internal viscous stress to create microvortices of well-defined shape and periodicity, which enables the control of cell-cell distances

Methodology Applied

Scientific EffectViscous stress:

Data Source

PatentUS20240017258A1Hydrodynamically-induced droplet microvortices for modulating cell dynamics

Publication Date: 2024.01.18 RGT UNIV OF CALIFORNIA

AI summary

A microfluidic platform comprising an inlet, a fluidic chamber, one or more trapping arrays, each trapping array comprising pillars separated by gaps, an outlet, and a droplet generator fluidly coupled to the inlet. The droplet generator may accept one or more particles and output particle-laden droplets comprising a particle surrounded by an aqueous solution surrounded by a carrier oil. The particle-laden droplets directed from the droplet generator, through the inlet, to the fluidic chamber, may be immobilized by the one or more trapping arrays. The droplet generator may generate a continuous flow of carrier oil through the inlet and through the fluidic chamber. The continuous flow of carrier oil may induce one or more microvortices at the one or more trapping arrays.