Digital Microfluidic Device Droplet Transfer via Sampling Hole
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Solution Overview
Problem
Conventional microfluidic systems face challenges in efficiently transferring and integrating digital microfluidic device droplets to downstream analyzers, often resulting in manual, off-line steps that lead to adsorption, contamination, and sample loss.
Innovation Solution
A method and system that utilize a sampling hole in a digital microfluidic device to merge a sample droplet with an extraction droplet, allowing for automated, in-line transfer of the merged droplet to downstream analyzers through actuation electrodes and a fluid handling system, such as an autosampler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual, off-line steps are used to transfer droplets from DMF system to downstream analyzer, then the DMF system can be used for fluid processing, but the transfer process leads to adsorption, contamination, and sample loss
Solution Approach 1:
The patent merges the DMF system with the downstream analyzer by integrating a sampling hole directly in the DMF device plate, allowing the extraction droplet to form and merge with the sample droplet within the DMF system itself, eliminating the need for manual transfer between separate devices
Solution Approach 2:
The patent introduces an extraction droplet as an intermediary medium that forms in the sampling hole and merges with the sample droplet, enabling automated transfer of the combined droplet to the downstream analyzer without direct manual handling
2Productivity
If automated, in-line transfer is implemented through sampling hole and fluid handling system, then sample transfer efficiency improves and contamination is reduced, but device complexity increases
Solution Approach 1:
The DMF system plate is designed with multi-functionality by incorporating a sampling hole that serves both as a structural component of the DMF device and as an interface for automated sample extraction, allowing the same device to perform both fluid processing and sample transfer functions
Solution Approach 2:
The system enables self-service automation where the fluid handling system automatically forms the extraction droplet in the sampling hole, merges it with the sample droplet, and transfers the combined droplet to the downstream analyzer without requiring manual intervention at each step
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 efficient, automated, and contamination-free transfer of microfluidic droplets from digital microfluidic devices to downstream analysis devices, reducing manual handling and sample loss, and facilitating integration as a direct, in-line sample processing platform.
Implementation Method 1
digital microfluidics (DMF) enables the processing of single isolated droplets through the electric manipulation of fluid droplets on electrode arrays (e.g., via electrowhetting or dielectrophoresis)
Implementation Method 2
digital microfluidics (DMF) enables the processing of single isolated droplets through the electric manipulation of fluid droplets on electrode arrays (e.g., via electrowhetting or dielectrophoresis)
Implementation Method 3
cohesive forces between molecules in the sample droplet and the extraction droplet are effective to merge the sample droplet and extraction droplet upon contact
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3(C)
AI summary
Methods and systems for processing fluids utilizing a digital microfluidic device and transferring droplets from the digital microfluidic device to a downstream analyzer are described herein. Methods and systems in accordance with the present teachings can allow for the withdrawal of fluid from a digital microfluidic device, and can in some aspects enable the integration of a digital microfluidic device as a direct, in-line sample processing platform from which a droplet can be transferred to a downstream analyzer.