Programmable Fluidic Processor Using Dielectrophoretic Droplet Manipulation
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Solution Overview
Problem
Conventional fluidic processors face issues with surface fouling and sample carryover due to protein denaturation and accumulation at hydrophobic-hydrophilic interfaces, leading to contamination and disruption of droplet manipulation processes.
Innovation Solution
The development of programmable microfluidic systems using dielectrophoretic (DEP) forces to manipulate droplets without physical contact, employing insulating coatings and droplet-repellent surfaces to prevent contamination, and utilizing AC fields to create DEP forces that allow for contact-free manipulation and mixing of droplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If droplets are manipulated by surface contact methods, then droplet manipulation is achieved, but surface fouling and sample carryover occur due to protein denaturation and accumulation at hydrophobic-hydrophilic interfaces
Solution Approach 1:
The patent replaces mechanical surface contact manipulation with dielectrophoretic (DEP) forces generated by AC electric fields. Droplets are manipulated through the bulk fluid medium rather than by direct contact with surfaces, eliminating protein denaturation and accumulation at hydrophobic-hydrophilic interfaces while maintaining full droplet control capability
Solution Approach 2:
The patent introduces an AC electric field as an intermediary to transfer momentum and control droplets without direct mechanical contact. The electric field acts as a mediator that exerts DEP forces on droplets through the suspending medium, avoiding harmful surface interactions while enabling precise droplet manipulation
2Ease of operation
If fixed surfaces are used for droplet processing, then droplet manipulation is enabled, but contamination accumulates and disrupts operation over time
Solution Approach 1:
The patent replaces fixed surface-based manipulation with volumetric AC field-based DEP manipulation. Droplets are controlled through the bulk fluid medium rather than by surface contact, preventing contamination accumulation on fixed surfaces and ensuring continuous reliable operation without disruption from surface fouling
Solution Approach 2:
The patent creates an inert electric field environment for droplet manipulation that does not interact chemically or physically with droplet contents. The AC electric field serves as a non-invasive manipulation medium that prevents contamination while maintaining full control over droplet movement and processing
3Ease of operation
If surface contact manipulation is used, then droplet control is achieved, but proteins precipitate and associate with surfaces causing contamination
Solution Approach 1:
The patent replaces mechanical surface contact with AC field-based DEP forces that manipulate droplets through the bulk fluid. This eliminates the hydrophobic-hydrophilic interface interactions that cause protein precipitation and association, while maintaining precise droplet control capability
Solution Approach 2:
The patent introduces AC electric fields as an intermediary that exerts forces on droplets without direct contact. The electric field mediates droplet control while preventing proteins from encountering surfaces where they would precipitate and associate, eliminating contamination generation
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 reliable, versatile, and contamination-free manipulation of droplets across a wide range of applications, including chemical and biochemical assays, by using DEP forces to move and mix droplets without surface contact, ensuring efficient and accurate processing.
Implementation Method 1
utilizing AC fields to create DEP forces that allow for contact-free manipulation and mixing of droplets
Implementation Method 2
At least one electrode is coupled to the reaction surface in which the at least one electrode includes an insulating coating for preventing contact between the droplets and the at least one electrode
Implementation Method 3
employing insulating coatings and droplet-repellent surfaces to prevent contamination
Data Source
AI summary
Disclosed are apparatuses, systems, and methods for programmable fluidic processors. In one embodiment, the invention involves manipulating droplets across a reaction surface of the processor substantially contact-free of any surfaces. The reaction surface and the electrodes of the processor may include a coating repelling the droplets. Further, the present invention provides for a suitable suspending medium for repelling droplets away from fixed surfaces.