Microfluidic Cell Focusing for Contactless Deformation Analysis
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Solution Overview
Problem
Existing methods for studying cell deformations, such as atomic force microscopy and microfluidics-based approaches, suffer from low throughput and require contact with probes, leading to contamination and complex operation procedures.
Innovation Solution
A method utilizing a non-Newtonian viscoelastic fluid to focus cells in a focusing microchannel without a sheath flow, aligning them in single file or a two-dimensional array, followed by deformation in a downstream microchannel without wall contact, enabling high-throughput cell deformation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single cell measurement techniques are used to achieve accurate deformability values, then measurement precision is improved, but measurement throughput decreases and operation complexity increases
Solution Approach 1:
The invention segments the cell population into individual cells flowing in single file through a microfluidic channel. Each cell is individually deformed and measured by imaging, allowing high-throughput analysis while maintaining single-cell measurement precision. The segmentation is achieved through flow focusing that positions cells one by one in the deformation zone.
Solution Approach 2:
The invention replaces complex mechanical measurement systems (like AFM cantilevers or micropipettes) with a simpler microfluidic flow-based deformation system. Cells are deformed by controlled flow conditions in a microchannel, and their mechanical properties are inferred from imaging data, eliminating the need for complex mechanical probes while maintaining measurement accuracy.
2Measurement precision
If probe-based methods are used to measure cell deformability, then measurement precision is improved, but cell contamination increases and ease of operation worsens
Solution Approach 1:
The invention extracts the measurement function from physical probes and implements it through a probe-free microfluidic system. Cells are deformed by hydrodynamic forces in a microchannel and imaged without contact, eliminating probe-induced contamination while preserving the ability to measure cell mechanical properties accurately.
Solution Approach 2:
The invention introduces a fluid intermediary (the suspending medium flowing through the microchannel) to transmit deformation forces to cells without solid probe contact. The fluid medium acts as a mediator that applies controlled shear stress to deform cells while minimizing direct contact and potential contamination from solid surfaces.
3Measurement precision
If constriction-based deformability cytometry is used to measure cell deformability, then measurement precision is improved, but device complexity increases and cell contamination increases
Solution Approach 1:
The invention applies local quality by creating a specific deformation zone within the microchannel where controlled shear stress is applied to cells. The channel geometry is designed to produce localized flow conditions that deform cells in a predictable manner, while other parts of the channel maintain simple structures for easy fabrication and operation.
4Object-affected harmful factors
If shear flow or extensional flow deformability cytometry is used to avoid cell contact, then cell contamination is reduced, but measurement precision and throughput are limited by geometry constraints
Solution Approach 1:
The invention employs dynamic flow conditions in the microchannel to deform cells. The flow velocity and shear rate are optimized to achieve sufficient cell deformation for accurate measurement while maintaining contactless operation. The dynamic nature of the flow allows precise control over deformation magnitude without requiring complex static geometries.
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 cell deformation analysis with improved biocompatibility and reduced contamination, facilitating applications like rare event detection and therapeutic interventions.
Implementation Method 1
the suspending medium is a non-Newtonian fluid having viscoelastic properties such that cells that enter the focusing microchannel are focused towards a center of the focusing microchannel
Implementation Method 2
causing cells that have exited the focusing microchannel to flow through a deformation microchannel arranged downstream of the focusing microchannel to cause deformation of cells in the flow, the deformation being caused by a flow pattern created by interaction of the flow with the walls of the deformation microchannel
Data Source
AI summary
In a method of investigating cell deformations, a sample fluid including cells suspended in a suspending medium is provided. A flow of the sample fluid through a focusing microchannel is established. The suspending medium is a non-Newtonian fluid having viscoelastic properties such that cells that enter the focusing microchannel are focused towards a center of the focusing microchannel due to the viscoelastic properties of the suspending medium, causing the cells to exit the focusing microchannel in single file. Subsequently, the sample fluid that has exited the focusing microchannel is caused to flow through a deformation microchannel arranged downstream of the focusing microchannel to cause a deformation of cells that have exited the focusing microchannel and have entered the deformation microchannel, the deformation being caused by a flow pattern created by interaction of the fluid flow with the deformation microchannel.