Droplet Sorting Device Stabilizes Formation via Satellite Droplet Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Droplet sorting devices, such as cell sorters, face instability due to environmental changes like temperature fluctuations and fluid pressure variations, affecting the robustness of droplet formation and sorting performance.
Innovation Solution
A droplet sorting device that controls the frequency of the driving voltage supplied to the vibration element based on the position of satellite droplets, adjusting the break-off point and ensuring bilaterally symmetric droplet formation to stabilize droplet formation and sorting, using a droplet detector and controller to optimize the clock value for consistent droplet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration element is used to break fluid into droplets, then droplet sorting can be performed, but sorting performance becomes unstable due to temperature change and fluid pressure fluctuation
Solution Approach 1:
The patent implements a feedback control system where the imaging device captures images of droplets, the image processing unit analyzes droplet formation quality, and the control unit adjusts the driving voltage frequency based on this analysis. This closed-loop feedback mechanism compensates for environmental variations such as temperature changes and fluid pressure fluctuations, maintaining stable sorting performance despite external disturbances
Solution Approach 2:
The system dynamically changes the operating parameters of the vibration element by adjusting the frequency of the driving voltage based on real-time droplet formation quality. Instead of using a fixed frequency, the system adapts the frequency parameter in response to environmental conditions, allowing the droplet formation process to remain optimal under varying temperature and pressure conditions
2Device complexity
If the driving voltage frequency is fixed, then the device structure is simple, but droplet formation becomes sensitive to environmental changes
Solution Approach 1:
The control unit receives feedback from the image processing unit about droplet formation quality and automatically adjusts the driving voltage frequency accordingly. This feedback loop eliminates the need for complex manual calibration while maintaining stable droplet formation, achieving both simplicity and reliability
Solution Approach 2:
The system performs self-adjustment by automatically detecting droplet formation issues through imaging and correcting them by modifying the driving voltage frequency. The device monitors its own performance and makes real-time corrections without external intervention, reducing the need for complex external control systems
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
The solution enables stable and robust droplet formation, reducing the impact of environmental changes and ensuring accurate and long-term stable sorting performance by determining an optimal droplet formation frequency for each chip, thus enhancing the robustness of the sorting process.
Implementation Method 1
a vibration element configured to vibrate the flow channel structure
Implementation Method 2
a droplet detector configured to detect a position of a satellite droplet ejected from an orifice of the flow channel structure
Data Source
Figure 1
Figure 2A
Figure 2B~3A
AI summary
There is provided a droplet sorting device including a detector configured to detect a state of droplets ejected from an orifice that generates a fluid stream and of satellite droplets existing between the droplets, and a controller configured to control a frequency of a driving voltage supplied to a vibration element that applies vibration to the orifice on the basis of positions where the satellite droplets exist.