Microfluidic Cell Sorting via Adhesion and Compression
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Solution Overview
Problem
Current cell sorting methods, such as fluorescence activated cell sorting (FACS) and magnetic nanoparticle tagging, are limited in their ability to achieve high-throughput separation and fractionation of cells based on molecular adhesion properties, often resulting in cell damage due to shear forces and lack of sensitivity to specific molecular interactions.
Innovation Solution
A microfluidic device with ridged microchannels coated with adhesion molecules, where cells undergo compression and relaxation, allowing transient interactions that redirect cells based on their adhesion properties, enabling high-throughput sorting and fractionation without damaging the cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell sorting methods (FACS, magnetic nanoparticle tagging) are used to separate cells based on molecular adhesion properties, then cell separation can be achieved, but cell damage occurs due to shear forces and the methods lack sensitivity to specific molecular interactions
Solution Approach 1:
The patent replaces conventional mechanical sorting methods (FACS, magnetic tagging) with a microfluidic adhesion-based system that uses controlled compression and molecular adhesion instead of high shear forces, thereby maintaining cell integrity while achieving high throughput sorting
2Productivity
If high flow rates are used to increase sorting throughput, then productivity improves, but cell damage increases due to shear forces
Solution Approach 1:
The patent replaces shear-force-based mechanical sorting with an adhesion-based mechanism that operates effectively at high flow rates without subjecting cells to damaging forces, enabling high throughput while preserving cell integrity
Solution Approach 2:
The patent changes the sorting mechanism from shear-force-dependent to adhesion-dependent by controlling compression parameters and adhesion molecule interactions, allowing high flow rates to be used without increasing cell damage
3Measurement precision
If compression is applied to cells during sorting to enhance separation based on biomechanical properties, then sorting precision improves, but the influence of stiffness and viscoelasticity interferes with detection of specific molecular adhesion properties
Solution Approach 1:
The patent extracts the specific molecular adhesion signal from the confounding biomechanical effects by using controlled compression that minimizes stiffness-dependent separation while enhancing adhesion molecule interactions, thereby isolating the adhesion property detection
Solution Approach 2:
The patent uses adhesion molecules as intermediaries that mediate between the compression force and cell response, allowing specific molecular interactions to be detected while minimizing the direct influence of cell stiffness and viscoelasticity on sorting
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
The device achieves efficient sorting and fractionation of cells based on adhesion properties, with up to 40,000 cells sorted per minute, maintaining cell integrity and allowing for high flow rates, while minimizing the influence of biomechanical properties like stiffness and viscoelasticity.
Implementation Method 1
the microchannel is coated with at least one adhesion molecule... exposing the plurality of cells to the at least one adhesion molecule, wherein the exposing causes a first portion of the cells having a first adhesion property to temporarily bind to the adhesion molecule
Implementation Method 2
compressing the plurality of cells underneath the compressive surface... compressing the first and second cells as they flow through the microchannel
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
Embodiments of the present disclosure can include a method comprising: providing a plurality of cells to a microchannel, the microchannel coated in at least one cell adhesion entity and comprising a compressive surface and a first outlet, the compressive surface defining a compression gap, flowing the plurality of cells through the microchannel, wherein the flowing comprises: compressing the plurality of cells underneath the compressive surface; and exposing the plurality of cells to the at least one cell adhesion entity, wherein the exposing causes a first portion of the cells having a first adhesion property to temporarily bind to the cell adhesion entity; and collecting the first portion of cells at the first outlet; wherein the compression gap has a height of from 75% to 95% an average diameter of the plurality of cells.