Holographic Cell Sorting via Microfluidic Segmentation
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Solution Overview
Problem
Current cell sorting systems, such as FACS, face limitations in throughput, purity, recovery rate, and are bulky, expensive, and not suitable for in-flow analysis and sorting of cells, requiring a more efficient and compact solution for high-speed, flexible, and reliable cell analysis and sorting.
Innovation Solution
A device and method utilizing a holographic imaging unit with microfluidic channels for real-time characterization and sorting of cells in a flowing medium, capable of imaging over 500 objects per second, featuring a processing unit that controls microfluidic switches based on holographic diffraction images and fluorescence signals, with a compact design suitable for point-of-care applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional FACS systems are used for cell sorting, then high single cell level sensitivity and high throughput are achieved, but the equipment size becomes large and cost increases
Solution Approach 1:
The conventional FACS system is segmented into two separate functions: (1) a flow cytometer for high-sensitivity detection and characterization of cells, and (2) a microfluidic sorter for compact, low-cost sorting. This segmentation allows each component to be optimized independently, achieving high sensitivity in detection while maintaining compact size in the sorting unit.
Solution Approach 2:
The detection and characterization function is extracted from the sorting system. The flow cytometer performs comprehensive cell analysis, and only the essential sorting function remains in the compact microfluidic device, removing unnecessary complexity and size from the sorting component.
2Productivity
If conventional FACS systems are used for cell sorting, then high throughput of sorting and counting is achieved, but the systems are bulky and expensive
Solution Approach 1:
The complex mechanical droplet deflection system of conventional FACS is replaced with a simplified microfluidic valve-based sorting mechanism. The microfluidic sorter uses controlled fluid flow and valve actuation instead of mechanical droplet manipulation, reducing device complexity while maintaining sorting throughput.
3Volume of stationary object
If microfluidic FACS systems are used, then miniaturization and disposability are achieved, but sorting speed becomes slower
Solution Approach 1:
Cells are pre-characterized and sorted into different populations by the flow cytometer before entering the microfluidic sorter. This preliminary classification allows the microfluidic device to perform only the final sorting action, maximizing its limited speed while maintaining miniaturization benefits.
4Productivity
If high sorting speed is achieved in modern FACS, then throughput increases, but purity rate and recovery rate trade off
Solution Approach 1:
The flow cytometer provides real-time feedback on cell characteristics to control the microfluidic sorter. This feedback mechanism ensures that sorting decisions are based on accurate, up-to-date cell information, maintaining high purity rates even at increased sorting speeds.
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, flexible, and reliable in-flow cell analysis and sorting with minimal sample preparation, maintaining cell viability and genomic integrity, suitable for various applications including cancer research and bioprocess monitoring, with the ability to process cells at speeds comparable to or exceeding existing microfluidic systems.
Implementation Method 1
a laser beam is shone onto the flow of cells and an image sensor records diffraction images of the cells
Implementation Method 2
state of the art methods for cell sorting, which perform sorting of a heterogeneous mixture of biological cells based upon the specific light scattering and/or fluorescent characteristics
Implementation Method 3
FACS has a high single cell level sensitivity and therefore may be capable of detecting cell surface markers at the single cell level, which may be largely due to the excellent sensitivity of the fluorescence detection
Data Source
AI summary
A device and method for sorting objects immersed in a flowing medium are disclosed. An example device comprises a holographic imaging unit comprising one or more holographic imaging elements, a fluid handling unit comprising one or more microfluidic channels configured to conduct flowing medium along a corresponding holographic imaging element and at least one microfluidic switch arranged downstream of an imaging region in the microfluidic channel configured to direct objects in the flowing medium into a one of a plurality of outlets. The example device also comprises a processor configured to determine real-time characterizations of holographic diffraction images obtained for the moving objects. The processing unit is further configured to control the at least one microfluidic switch in response to the real-time characterizations.