Microfluidic Device with Programmable DEP Switching
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Solution Overview
Problem
Existing microfluidic devices and opto-electrical control systems suffer from inefficiencies due to the limited ability to perform active opto-electrical processing (OEP) across multiple fields of view simultaneously, leading to reduced processing efficiency as the number of devices and fields of view increases.
Innovation Solution
The development of microfluidic devices with a circuit substrate featuring a control unit, a switching mechanism associated with a dielectrophoresis (DEP) electrode, and a memory unit, which allows for programmable switching instructions to be received, stored, and retrieved to control the DEP electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single imaging device is used to control multiple microfluidic devices, then device complexity is reduced, but processing efficiency decreases due to sequential operation of multiple fields of view
Solution Approach 1:
The imaging device is divided into multiple independent imaging modules, each capable of independently imaging a specific field of view and controlling corresponding DEP electrodes. This segmentation allows parallel processing across multiple fields of view while maintaining manageable complexity through modular design.
Solution Approach 2:
The system transitions from sequential time-based control to parallel spatial control by adding multiple imaging devices operating simultaneously in different spatial positions. Each imaging device independently controls its corresponding field of view, enabling concurrent processing across multiple devices.
2Speed
If the light source is continuously ON to enable active opto-electrical processing, then processing speed improves, but energy consumption increases
Solution Approach 1:
The light source operates periodically rather than continuously, activating only when imaging and control operations are required. This periodic operation maintains processing speed by ensuring light is available when needed while significantly reducing overall energy consumption through idle periods.
Solution Approach 2:
The system automatically activates the light source based on detected presence of micro-objects or required processing conditions, eliminating the need for continuous operation. The imaging device itself triggers light activation only when processing is required, optimizing the balance between speed and energy consumption.
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 more efficient processing of micro-objects across multiple fields of view by allowing simultaneous control of DEP electrodes, thereby enhancing the overall processing efficiency of microfluidic devices and opto-electrical control systems.
Implementation Method 1
each photosensitive element is configured to generate an output signal comprising instructions for controlling the corresponding one or more switch mechanisms in response to a modulated light beam directed onto the photosensitive element
Implementation Method 2
a dielectrophoresis (DEP) electrode at each of a plurality of locations on or proximate to the circuit substrate surface is disposed to be in electrical contact with the fluidic medium
Data Source
AI summary
Microfluidic devices having a circuit substrate with a control unit, a switching mechanism associated with a dielectrophoresis (DEP) electrode, and a memory unit are described. Switching instructions may be received, stored, and retrieved by the control unit and used to control the DEP electrode via the switching mechanism. Systems comprising the described microfluidic devices and methods of controlling the described microfluidic devices are included herein.