Microfluidic Ejector Array for Particle Sorting
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Solution Overview
Problem
Current Fluorescence Activated Cell Sorting (FACS) systems are complex, expensive, and require specialized personnel for maintenance and operation, necessitating a simpler and more accessible solution for optical sorting of particles like cells.
Innovation Solution
A particle sorting system utilizing microfluidic ejectors with non-destructive, continuous optical monitoring, where an imaging system with an annular mirror focuses on the ejectors to identify and sort particles based on shape, fluorescence, or size, using a controller to physically direct droplets to collection vessels with optional electric steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional FACS systems are used for particle sorting, then sorting capability is achieved, but device complexity and cost increase
Solution Approach 1:
The system divides the particle sorting function into multiple independent microfluidic ejectors arranged in an array, where each ejector can independently sort particles based on their optical properties. This segmentation allows the complex sorting function to be distributed across simpler, identical units, reducing overall system complexity while maintaining sorting reliability.
Solution Approach 2:
The patent replaces the traditional mechanical vibrating flow cell with an optical detection and microfluidic ejection system. Optical properties (fluorescence, scattering) are used to identify particles, and microfluidic ejectors physically sort them, substituting complex mechanical sorting mechanisms with simpler optical and fluidic processes.
2Ease of operation
If traditional FACS systems are used, then particle sorting is achieved, but operational complexity and personnel requirements increase
Solution Approach 1:
The system automatically detects particle properties optically and triggers ejector activation without requiring manual intervention. The microfluidic ejectors self-regulate droplet ejection based on real-time optical feedback, enabling the system to operate autonomously with minimal personnel training and maintenance requirements.
Solution Approach 2:
An optical detection system continuously monitors particle properties and provides real-time feedback to the microfluidic ejector array. This feedback loop enables automatic adjustment of ejection timing and positioning, allowing the system to adapt to varying particle characteristics without manual control.
3Measurement precision
If continuous optical monitoring is implemented, then sorting accuracy is improved, but device complexity increases
Solution Approach 1:
The optical detection and microfluidic ejection functions are merged into a single integrated system where the same optical path used for imaging also serves as the detection mechanism for triggering ejectors. This consolidation eliminates separate monitoring systems and reduces overall device complexity while maintaining high measurement precision.
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 system provides a cost-effective, user-friendly method for sorting cells by enabling continuous optical monitoring and precise targeting of particles, reducing the need for specialized equipment and personnel while maintaining high sorting accuracy.
Implementation Method 1
An imaging system, such as a microscope, monitors the feed to the ejectors without interfering with ejected material reaching a target destination
Implementation Method 2
an imaging system with an annular mirror focuses on the ejectors to identify and sort particles
Implementation Method 3
The microfluidic ejectors are similar to ejectors used in ink-jet printers and may include thermally actuated ejectors and piezoelectric cell ejectors
Implementation Method 4
The droplets are electrically charged and deflected into different collection tubes based on the electrical charge
Data Source
AI summary
A system and a method for sorting particles are provided. An example of a particle sorting system includes an array that includes a number of microfluidic ejectors. An optical sensor is focused on the array. A controller is used to identify a target particle proximate to a microfluidic ejector, and activate the microfluidic ejector to eject the target particle into a collection vessel.