Microfluidic Cell Separation via Inertial Focusing and Ferrohydrodynamics
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Solution Overview
Problem
Current cell separation technologies face challenges with high cost, low separation resolution, and limited throughput, making it difficult to efficiently process large volumes of biological samples for rare cell types like circulating tumor cells and T lymphocytes, which are crucial for cancer research and immunotherapy.
Innovation Solution
The integration of inertial focusing and ferrohydrodynamic separation in a multi-stage microfluidic device, using a ferrofluid and a magnetic field to separate cells based on size, allowing for high-throughput and high-resolution separation of cells without the need for labeling or expensive reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cell separation technologies are used, then separation can be achieved, but the throughput is limited and processing time is long
Solution Approach 1:
The separation process is divided into multiple sequential stages: inertial focusing stage, sheathing fluid stage, and ferrohydrodynamic separation stage. Each stage performs a specific function to progressively separate cells by size, enabling high-throughput processing while maintaining separation resolution.
Solution Approach 2:
The patent replaces conventional mechanical separation methods with a combination of inertial forces and ferrohydrodynamic forces. The inertial focusing channel uses curved geometry to generate inertial forces that focus cells by size, while the ferrohydrodynamic stage uses magnetic field interactions with ferrofluid to achieve rapid separation, significantly increasing throughput compared to traditional mechanical methods.
2Measurement precision
If labeling methods are used for cell separation, then specific cell types can be identified, but the cost increases and the process becomes more complex
Solution Approach 1:
The patent changes the physical parameters of the fluid medium by introducing ferrofluid with magnetic properties. This enables separation based on cell size through inertial and magnetic forces without requiring biochemical labeling, thereby maintaining separation resolution while reducing process complexity and cost.
Solution Approach 2:
The patent substitutes biochemical labeling methods with a purely physical separation mechanism based on inertial forces and ferrohydrodynamic interactions. The inertial focusing channel and magnetic field work together to separate cells by size without any labels, simplifying the process while maintaining high separation resolution.
3Measurement precision
If conventional separation methods are used, then cell separation can be achieved, but the separation resolution is low
Solution Approach 1:
The separation process is divided into multiple sequential stages: inertial focusing stage, sheathing fluid stage, and ferrohydrodynamic separation stage. Each stage performs a specific function to progressively separate cells by size, enabling high-throughput processing while maintaining separation resolution.
Solution Approach 2:
The patent changes the physical parameters of the fluid medium by introducing ferrofluid with magnetic properties. This enables separation based on cell size through inertial and magnetic forces without requiring biochemical labeling, thereby maintaining separation resolution while reducing process complexity and cost.
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 method enables the rapid and precise separation of cells with a throughput of up to 100,000 cells per second and a resolution of 1-2 μm diameter difference, effectively enriching target cells from large volumes of biological samples while maintaining cell viability and reducing costs.
Implementation Method 1
an inertial focusing stage, wherein the first microfluidic channel splits into two or more serpentine focusing channels at a first end of the inertial focusing stage, each serpentine focusing channel having a plurality of alternating micro-curves configured to focus cells/particles within the sample into a narrow stream
Implementation Method 2
a magnetic source in the ferrohydrodynamic separation stage configured produce a substantially symmetric magnetic field having a field maximum along an inner longitudinal axis of the ferrohydrodynamic separation channel sufficient to cause cells/particles flowing in the ferrohydrodynamic separation channel to be deflected away from the center of the ferrohydrodynamic separation channel towards the sides of the ferrohydrodynamic separation channel as a function of the size of the cells/particles
Data Source
AI summary
The present application provides devices, kits, and methods for label-free separation of cells and/or other small particles with high resolution and throughput. Devices, kits, and methods of the present disclosure include a focusing stage for inertial based focusing of cells/particles in a sample followed by ferrohydrodynamic, size-based separation in a separation stage. These devices, kits and methods provide the ability to separate and enrich target cells/particles from a sample with high resolution and efficiency.