Microfluidic Siphoning Array With Gas-Permeable Film for Air Fouling
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Solution Overview
Problem
Existing microfluidic devices face issues with trapped air fouling, particularly when using thermoplastic materials, limiting functionality and increasing manufacturing complexity and cost, especially in digital PCR applications.
Innovation Solution
A microfluidic device design featuring thermoplastic thin films that are partially gas permeable under pressure differential, allowing for outgassing and eliminating trapped air without the need for elastomeric materials or complex channel designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic materials are used to create microfluidic structures, then manufacturing cost and ease of manufacture are improved, but gas permeability is very low causing trapped air fouling
Solution Approach 1:
The patent applies porous thermoplastic materials that allow gas permeability while maintaining the manufacturing advantages of thermoplastics. This resolves the contradiction by enabling trapped air to escape through the porous structure during microfluidic operations, eliminating fouling while retaining cost-effective thermoplastic manufacturing.
Solution Approach 2:
The patent changes the gas permeability parameter of thermoplastic materials by selecting specific materials with appropriate pore structures. This allows the material to transition from being gas-impermeable (causing fouling) to gas-permeable (allowing air escape), while maintaining the ease of manufacture and low cost associated with thermoplastic processing.
2Object-affected harmful factors
If simple straight channel or branched channel designs are used, then trapped air fouling is avoided, but functionality of the microfluidic device is limited
Solution Approach 1:
By using porous thermoplastic materials, the patent enables complex microfluidic structures (siphoning arrays, valves, pumps) to be manufactured without suffering from trapped air fouling. This resolves the contradiction by allowing functional complexity while maintaining gas permeability through the material's porous structure.
Solution Approach 2:
The patent employs composite approaches combining thermoplastic materials with porous structures or hydrophobic coatings to create materials that simultaneously provide gas permeability for air escape and the functional complexity needed for advanced microfluidic operations.
3Object-affected harmful factors
If elastomeric materials with high gas permeability are used, then trapped air fouling is avoided, but manufacturing difficulty and cost increase
Solution Approach 1:
The patent changes the material selection from elastomers to porous thermoplastics, maintaining the gas permeability parameter needed for air escape while dramatically improving the ease of manufacture. Thermoplastics can be injection-molded and processed more easily than elastomers, reducing manufacturing difficulty and cost while achieving the same anti-fouling effect.
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 efficient nucleic acid amplification and quantification in digital PCR at reduced cost and complexity by preventing air fouling, enhancing sensitivity and reproducibility.
Implementation Method 1
thermoplastic thin film that are partially gas permeable under pressure differential, allowing for outgassing and eliminating trapped air
Implementation Method 2
thermoplastic thin film is at least partially permeable to a gas under a pressure differential applied across the thermoplastic thin film
Data Source
AI summary
In some aspects, the present disclose provides methods for amplifying and quantifying nucleic acids. Methods for amplifying and quantifying nucleic acids comprise isolating a sample comprising nucleic acid molecules into a plurality of microchambers, performing a polymerase chain reaction on the plurality of microchambers, and analyzing the results of the polymerase chain reaction. In some aspects, the present disclosure provides devices consistent with the methods herein.