Pressure-Controlled Fluid Release Assembly for Evaporation-Free Droplets
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Solution Overview
Problem
Existing microfluidic devices face challenges in preventing evaporation during thermal processes and pressure cycles, particularly in the generation of aqueous droplets for nucleic acid amplification and analysis, and lack a contactless method for precise droplet deposition.
Innovation Solution
A non-compressible compartment with a gas-filled channel system is used to control fluid release, ensuring a contactless and precise dispensing of droplets by applying pressure cycles, which prevents evaporation and allows for automated and parallelized processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a saturated atmosphere chamber is used to prevent evaporation, then evaporation is prevented, but manipulation of chips becomes challenging
Solution Approach 1:
The device segments the chamber into distinct functional zones: a first chamber for droplet generation with controlled atmosphere, and a second chamber for thermal processing with saturated atmosphere. This segmentation allows each zone to be optimized for its specific function while maintaining overall system operation.
Solution Approach 2:
A transfer mechanism acts as an intermediary between the droplet generation chamber and the thermal processing chamber, enabling droplets to be transferred without requiring manual manipulation of chips in the saturated atmosphere environment.
2Ease of manufacture
If direct contact between reservoirs and liquid source is used, then fluid handling is simple, but evaporation occurs during thermal processes
Solution Approach 1:
The liquid reservoir is extracted from the thermal processing environment and placed in a separate first chamber. The channel system extracts the liquid from the reservoir and delivers it to the microfluidic chip, separating the liquid storage function from the thermal processing function to prevent evaporation.
Solution Approach 2:
The device replaces direct mechanical contact between reservoirs and liquid source with a pressure-driven flow system through channels, eliminating the need for direct contact while maintaining controlled fluid delivery.
3Measurement precision
If contactless fluid release is implemented, then evaporation is prevented and precision is improved, but device complexity increases
Solution Approach 1:
The device uses pneumatic pressure differential to achieve contactless fluid release. A pressure source applies pressure to the liquid in the reservoir, driving it through the channel system without mechanical contact, thereby achieving precise droplet deposition while limiting complexity through physics-based actuation.
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 system effectively prevents evaporation and enables precise, contactless droplet deposition, facilitating automated and parallelized operations in microfluidic chips for nucleic acid amplification and analysis.
Implementation Method 1
the compressible fluid being provided with a pressure so as to expand the compressible fluid and force the liquid fluid to move through the channel from the non-compressible compartment
Implementation Method 2
a non-compressible compartment... one channel for fluid flow, said channel extending outward said non-compressible compartment
Implementation Method 3
one of the two fluids being gas, wherein the fluid to be released has a density superior to the compressible fluid
Data Source
AI summary
The invention relates to an assembly for contactless pressure-controlled release of a fluid comprising a non-compressible compartment, at least two fluids in fluidic contact and enclosed inside the non-compressible compartment, one of the two fluids being compressible, and one channel for fluid flow.