Microfluidic Device Magnetic Actuation Cell-Free Area

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Solution Overview

Problem

Current in vitro methods for studying cell migration, such as the scratch assay, face challenges with reproducibility and reliability due to manual induction of injuries, which can damage the cell culture substrate and disrupt cell-substrate interactions, leading to irregular cell-free areas and jagged edges.

Innovation Solution

A microfluidic device with a cell chamber featuring a mechanical excluding means that can be actuated between an excluding and releasing position, creating a defined and reproducible cell-free area by displacing or preventing cells from entering a specific area, allowing for controlled cell migration studies without physical damage to the substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If manual scratching is used to create cell-free areas, then the method is simple and cost-effective, but the cell culture substrate is damaged and extracellular coatings are removed

Engineering Contradiction:

Improvesimplicity of methodVSAvoidsubstrate damage and coating removal

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the manual mechanical scratching system with a magnetic actuation system. A magnetic actuator positioned below the substrate uses magnetic fields to move magnetic particles or structures that create cell-free areas, eliminating direct mechanical contact with the substrate and preserving extracellular coatings while maintaining ease of operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnetic particles or magnetic-responsive structures as intermediaries between the actuator and the cells. These intermediaries are manipulated by magnetic fields to create cell-free areas without the need for direct mechanical contact with the substrate, thus avoiding damage to the substrate and extracellular coatings.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of time

If manual scratching is used to induce wounds, then the procedure is quick to perform, but the cell-free areas have irregular shapes and jagged edges reducing reproducibility

Engineering Contradiction:

Improvetime to create woundVSAvoidreproducibility of cell-free area

Core Design Contradiction:

Loss of timeVSManufacturing precision

Solution Approach 1:

The patent replaces manual mechanical scratching with magnetic actuation of magnetic particles or structures. The magnetic field can be precisely controlled to create cell-free areas with well-defined, reproducible shapes (such as circular patterns) while maintaining rapid execution of the procedure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the control parameter from manual physical motion to magnetic field strength and distribution. By adjusting magnetic field parameters, the system can consistently generate cell-free areas with precise, reproducible geometries while maintaining rapid wound induction.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11203015B2Microfluidic device

Publication Date: 2021.12.21 VIENNA UNIVERSITY OF TECHNOLOGY

AI summary

The present invention relates to a microfluidic device for creating within a cell assembly a cell-free area, comprising at least one cell chamber, wherein the at least one cell chamber comprises: —a fluid inlet for introducing fluid into the cell chamber, —a first area, —a second area, —at least one mechanical excluding means for excluding cells from the first area of the chamber and being operable between an excluding position and a releasing position optionally via an actuation line, wherein the second area of the cell chamber is outside of the operation range of the mechanical excluding means.