Microfluidic Device Surface Tension Pumping
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Solution Overview
Problem
Current microfluidic devices require expensive and complex external equipment for fluid pumping, which is not suitable for biological samples due to electrical interference and surface coating issues, and they are not compatible with conventional microplate pipetting workstations.
Innovation Solution
A microfluidic device with a channel structure that utilizes a pressure gradient generated by surface tension to pump fluid through a series of input and output ports, allowing for semi-autonomous operation and compatibility with commercial liquid handling robotics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrokinetic flow is used to pump fluid through microfluidic channels, then pumping function is achieved, but biological molecules are damaged and channels are coated rendering the method useless
Solution Approach 1:
The patent replaces electrokinetic flow (electrical pumping mechanism) with pressure-driven flow (mechanical pumping mechanism). Pressure is applied to the liquid reservoir to drive fluid through the microfluidic channels, avoiding electrical contact with biological samples and eliminating the harmful effects of electrokinetic flow on biological molecules and channel surfaces.
2Object-affected harmful factors
If pressure-driven flow is used to pump fluid through microfluidic channels, then biological samples are preserved, but expensive and complicated external pumping equipment is required
Solution Approach 1:
The microfluidic device is designed to be self-pumping by integrating a liquid reservoir that can be manually or mechanically pressurized. The device incorporates channels, ports, and flow control features directly into the microfluidic structure, eliminating the need for external syringe pumps or complex pumping mechanisms. The system serves itself by using internal pressure application to drive fluid flow through the integrated channels.
3Device complexity
If microfluidic devices are designed with integrated pumping mechanisms, then device complexity is reduced, but compatibility with conventional microplate pipetting workstations is lost
Solution Approach 1:
The microfluidic device incorporates standard microplate formats (e.g., 96-well or 384-well plates) as the basis for its structure. The liquid reservoirs are designed to fit standard microplate formats, and the input/output ports are positioned to align with conventional liquid handling robot tips. This universal design allows the device to be used with existing microplate workstations and liquid handling robotics without requiring specialized equipment, while still maintaining integrated microfluidic functionality.
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 high-throughput assays to be performed quickly and efficiently with reduced fluid volume, eliminating the need for expensive pumping equipment and ensuring compatibility with conventional microplate systems.
Implementation Method 1
A microfluidic device with a channel structure that utilizes a pressure gradient generated by surface tension to pump fluid through a series of input and output ports
Data Source
AI summary
A device and method is provided for performing a high throughput assay. The device includes a plate structure having a plate and a plurality of microfluidic structures positioned thereon. Each microfluidic structure defines a channel having an input and an output. At least one of the input and the output of the channel of each of the plurality of mircofluidic structures includes a first plurality of ports. In operation, the channels are filled with fluid and pressure gradients are generated between the fluids at the inputs and the fluids at the outputs of the channels. As a result, fluid flows through the channels toward the outputs.