Multi-hole inlet structure for microfluidic reagent introduction
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Solution Overview
Problem
The existing microfluidic devices face challenges in efficiently introducing reagents due to small sample inlet holes, which lead to difficulties in droplet formation and increased processing time, and require costly solutions or enlarged inlet holes that compromise Laplace pressure and control.
Innovation Solution
A microfluidic device with a multi-hole inlet structure, where each hole is smaller than the single-hole inlet, connected to a micro-channel, allowing for increased Laplace pressure and improved reagent flow velocity by distributing the reagent introduction across multiple openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sample inlet hole size is reduced to retain reagent, then the Laplace pressure increases, but the flow velocity of reagent decreases and processing time increases
Solution Approach 1:
The single inlet hole is segmented into multiple smaller holes, each maintaining high Laplace pressure for reliable reagent retention while collectively providing sufficient flow velocity and reduced processing time through parallel reagent introduction paths
2Ease of operation
If the sample inlet hole size is enlarged to improve droplet formation, then the Laplace pressure decreases, but the control over air-liquid interface becomes difficult and flow velocity decreases
Solution Approach 1:
The inlet structure is segmented into multiple small holes that collectively provide adequate droplet formation capability while each individual hole maintains sufficient Laplace pressure for reliable air-liquid interface control
3Ease of operation
If guide fixtures and pipette tips are used to align pipette tip with sample inlet, then droplet introduction becomes feasible, but device complexity and cost increase
Solution Approach 1:
The inlet is segmented into multiple holes arranged in a pattern that provides a larger target area for droplet introduction, eliminating the need for precise alignment mechanisms while maintaining effective reagent introduction
Solution Approach 2:
The multi-hole inlet structure serves multiple functions: it provides a larger effective target area for droplet capture, maintains high Laplace pressure through small individual hole sizes, and eliminates the need for separate alignment fixtures or specialized pipette tips
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
The multi-hole inlet structure enhances reagent introduction efficiency by maintaining higher Laplace pressure, increasing fluid velocity, and reducing processing time while maintaining control over the air-liquid interface, thus overcoming the limitations of single-hole designs.
Implementation Method 1
a capillary force is usually used to retain the reagent within the sample inlet
Implementation Method 2
The air-liquid interface is retained because the vacuum pressure is under a Laplace pressure
Data Source
AI summary
Some embodiments of a micro-fluidic device include at least one inlet hole located on an inlet side of the microfluidic device, the inlet hole consisting of a plurality of holes with diameters smaller in size than a diameter of the at least one inlet hole, at least one outlet hole located on an outlet side of the microfluidic device opposite the inlet side; and a micro-channel, where the plurality of holes are connected to the micro-channel.