Microfluidic Cell Deformability Measurement via Pressure Field
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Solution Overview
Problem
Current methods for measuring cell mechanical deformability are time-consuming and not suitable for point-of-care applications, particularly when processing large numbers of cells, as they require high-speed imaging and complex actuators, which are costly and inefficient for real-time sorting and analysis.
Innovation Solution
A compact, integrated microfluidic apparatus with intersecting fluidic channels and apertures that create a structured pressure field, allowing for low-speed imaging and efficient deformation analysis using simple fluid pumps, enabling real-time processing and potential for cell sorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed imaging and complex actuators are used to measure cell deformability, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical actuators and high-speed imaging systems with a microfluidic pressure field system. Pressure is applied through fluid flow through apertures in a channel wall, and cell deformation is measured using standard imaging systems, eliminating the need for specialized high-speed cameras and complex actuators while maintaining measurement capability
Solution Approach 2:
The patent introduces a fluid medium as an intermediary to transmit pressure to the cells. Instead of direct mechanical contact with complex actuators, pressure is transmitted through fluid flow through apertures, simplifying the actuation mechanism while enabling controlled deformation measurement
2Productivity
If high-speed imaging is used to process large numbers of cells, then productivity is improved, but cost and complexity increase
Solution Approach 1:
The patent segments the cell population into single-file flow through a microfluidic channel, allowing sequential processing of individual cells through the pressure field. This segmentation enables standard imaging systems to capture each cell's deformation at appropriate speeds without requiring expensive high-speed imaging, while maintaining high throughput through continuous flow
Solution Approach 2:
The patent uses hydraulic principles to generate controlled pressure fields through fluid flow through apertures. This hydraulic actuation system enables rapid processing of many cells through continuous flow while using simple, low-cost components instead of complex mechanical actuators and high-speed imaging systems
3Loss of time
If real-time cell sorting is implemented, then loss of time is reduced, but device complexity increases
Solution Approach 1:
The patent applies the pressure field and measures cell deformation before the sorting decision is made. Cells are pre-characterized as they flow through the pressure field, allowing real-time sorting based on measured deformability without requiring complex post-measurement processing or analysis delays
Solution Approach 2:
The microfluidic apparatus integrates multiple functions into a single system: pressure application, deformation measurement, and sorting control. The same fluidic system that applies pressure also enables sorting through flow direction control, eliminating the need for separate complex sorting mechanisms
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 solution reduces the cost and complexity of cell deformation analysis, allowing for rapid processing of large cell numbers and enabling real-time sorting, making it suitable for point-of-care instruments.
Implementation Method 1
introducing a pressure field at the intersection and into the first fluidic channel via the second fluidic channel and a plurality of apertures in a channel wall disposed in the intersection
Data Source
AI summary
An example method for measuring deformability of a cell via a pressure field, consistent with the present disclosure, includes flowing a biologic sample containing a plurality of cells along a first fluidic channel and into an intersection between the first fluidic channel and a second fluidic channel of a microfluidic device. The method includes introducing a pressure field at the intersection and into the first fluidic channel via the second fluidic channel and a plurality of apertures in a channel wall disposed in the intersection. The method further includes measuring deformability of a cell among the plurality of cells responsive to the introduction of the pressure field.