External Electrode Manipulation in Microfluidic Channels
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Solution Overview
Problem
Existing microfluidic devices for dielectrophoresis are limited by fixed electrodes within channels, restricting manipulation to predefined locations and increasing costs due to the use of materials like platinum, which are discarded with the device.
Innovation Solution
A microfluidic device with a channel having no internal electrodes, where an external array of electrodes generates a penetrable electric field through a wall portion, allowing for precise manipulation of objects within the channel without the need for embedded electrodes, reducing material costs and enabling arbitrary field applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrodes are deposited within the microfluidic device channels, then dielectrophoretic manipulation can be performed at specific locations, but the device complexity and material cost increase significantly
Solution Approach 1:
The patent extracts the electrodes from the internal structure of the microfluidic device and places them externally. The external electrodes are positioned adjacent to the device exterior surface, eliminating the need for complex internal electrode fabrication while maintaining dielectrophoretic manipulation capability through the device wall.
Solution Approach 2:
The patent segments the electrode system from the microfluidic device structure itself, creating independent external electrodes that can be positioned and controlled separately. This allows the device to be fabricated without electrode integration, simplifying the manufacturing process and reducing material costs.
2Reliability
If platinum electrodes are used for dielectrophoresis, then effective manipulation is achieved, but material cost increases significantly
Solution Approach 1:
The patent replaces expensive platinum electrodes with cost-effective external electrodes that can be made from conventional materials. These external electrodes achieve the necessary dielectrophoretic manipulation without requiring precious metals, significantly reducing material costs while maintaining functionality.
3Manufacturing precision
If fixed electrodes are embedded in the device, then manipulation at predefined locations is possible, but adaptability to arbitrary locations is lost
Solution Approach 1:
The patent makes the electrode system dynamic by allowing external electrodes to be repositioned along the exterior surface of the microfluidic device. This enables the electric field application location to be adjusted arbitrarily without requiring changes to the device structure, providing both positioning precision and location flexibility.
Solution Approach 2:
The external electrode design provides universal applicability across different device configurations and manipulation locations. The same external electrode structure can be used to manipulate objects at any position along the channel by simply repositioning the electrode externally, eliminating the need for location-specific internal electrodes.
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 solution enables cost-effective, precise manipulation of objects within microfluidic channels by using external electrodes that can be translated across the device surface, eliminating the need for embedded electrodes and allowing for flexible placement of electric fields, thus reducing device customization and material costs while enhancing manipulation capabilities.
Implementation Method 1
In dielectrophoresis, a force is exerted on a dielectric particle when it is subjected to a non-uniform electric field. All particles exhibit some dielectrophoretic activity in the presence of an electric field regardless of whether the particle is or is not charged.
Implementation Method 2
The channel has a wall, at least a portion of which is penetrable by an electric field generated external to the device, the wall being penetrable such that the electric field extends through the wall portion and into a region within the channel.
Data Source
Figure 1~2
Figure 3~4C
AI summary
The invention provides microfluidic devices, systems, and methods for manipulating an object within a channel of a microfluidic device using an external electrode. The device has a channel disposed within the device, the channel having no included electrodes. The channel has a wall, at least a portion of which is penetrable by an electric field generated external to the device, the wall being penetrable such that the electric field extends through the wall portion and into a region within the channel. The system includes the microfluidic device and an electrode external to and not bonded to the device. In the method, the external electrode is placed adjacent to the device and energized to generate an electric field that extends through the wall of the device and into the channel, thereby manipulating an object within the channel.