Microfluidic Droplet Sorting Chip for Single-Cell Isolation
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Solution Overview
Problem
Existing single cell sorting methods are costly, require skilled operators, and are prone to contamination, making them inefficient and unreliable for precise cell analysis.
Innovation Solution
A microfluidic chip design that generates droplets containing single cells through intersecting flow channels, allowing for automated and contamination-free sorting of target droplets using controlled fluid flow and voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional single cell sorting methods are used, then sorting capability is achieved, but cost is high and operation requires skilled operators
Solution Approach 1:
The patent replaces complex mechanical sorting systems with a microfluidic device that uses controlled fluid flow and voltage application to achieve single cell sorting. The microfluidic chip incorporates flow channels, junctions for droplet generation, and electrode structures for voltage-based manipulation, substituting manual mechanical operations with automated fluidic and electrical control mechanisms.
Solution Approach 2:
The invention utilizes microfluidic flow channels to transport cell suspensions and generate droplets containing single cells. The system employs fluid pressure control to regulate flow rates, droplet formation at channel junctions, and cell encapsulation, replacing mechanical handling with hydraulic control for automated sorting operations.
2Reliability
If conventional sorting methods are used, then cell separation is achieved, but environmental contamination occurs
Solution Approach 1:
The patent uses droplets as flexible containment shells to enclose individual cells during sorting. The droplet interface acts as a barrier that prevents environmental contamination while allowing the cell to remain isolated and protected throughout the sorting process, eliminating the need for complex rigid containment structures.
Solution Approach 2:
The microfluidic system creates a controlled, isolated environment within the chip where cell suspension flows through sealed channels and droplets. This closed fluidic system acts as an inert environment that protects cells from external contamination sources while enabling automated sorting operations.
3Reliability
If conventional sorting methods are used, then sorting is performed, but cell survival rate is reduced
Solution Approach 1:
The microfluidic device uses gentle fluid flow to transport cells through the sorting process, avoiding the high mechanical stresses of conventional methods. The hydrodynamic forces in the flow channels and during droplet generation are controlled to be non-damaging to cell integrity, maintaining high survival rates while enabling efficient sorting.
Solution Approach 2:
The invention changes the physical parameters of the sorting environment by using microscale fluid flow and controlled voltage application instead of mechanical forces. The droplet interface and fluidic conditions are optimized to minimize stress on cells, altering the sorting mechanism from mechanical to electrofluidic parameters that preserve cell viability.
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
Enhances automation, reduces costs, and improves cell survival rates while minimizing environmental contamination, enabling efficient and reliable single cell sorting.
Implementation Method 1
the first fluid and the second fluid meet at the junction and generate at least one droplet, each of at least a portion of the at least one droplet comprising a single cell from the cell suspension
Implementation Method 2
applying a voltage to the chip described in any of the foregoing embodiments to sort out target droplets with a target property from the at least one droplet
Data Source
AI summary
The present disclosure provides a chip, a microfluidic device. The chip includes a first container for accommodating a first fluid, a second container for accommodating a second fluid, a delivery channel including a first flow channel communicating with the first container and a second flow channel communicating with the second container, the first flow channel and the second flow channel intersecting and communicating with each other at a junction, and at least one collector. The delivery channel allows the first and second fluids to meet at the junction to generate droplets. The first flow channel comprises a first, a second and a third sub-portions, the second flow channel comprises a first, a second and a third portions. An area of a first cross-section of the second sub-portion at the junction is greater than or equal to an area of a second cross-section of the second portion at the junction.