Pneumatic Microfluidic Valve Structure for Zero Dead Volume Reuse
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Solution Overview
Problem
Current microfluidic devices are typically disposable, leading to increased costs and limitations in automation and scalability due to the need for new devices after each experimental run to avoid cross-contamination of reagents and samples.
Innovation Solution
A reusable microfluidic device with a pneumatic valve system comprising a pneumatic layer, a fluidic layer with non-perpendicular sides, and a membrane sandwiched between the two, allowing for positive or negative pressure application to control fluid flow through fluidic channels without perpendicular sides, enabling zero dead-volume operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disposable microfluidic devices are used to avoid cross-contamination, then sample purity is maintained, but device cost and operational complexity increase
Solution Approach 1:
The patent implements a reusable microfluidic device with an integrated pneumatic valve system that allows the same device to be used across multiple experimental runs. The pneumatic layer enables controlled actuation of valves to clear fluidic channels between runs, recovering the device for reuse while maintaining sample purity by preventing cross-contamination through active flushing mechanisms.
2Loss of substance
If reusable microfluidic devices are implemented to reduce costs, then operational cost decreases, but cross-contamination risk increases
Solution Approach 1:
The patent employs a pneumatic layer integrated into the microfluidic device that uses gas pressure to actuate valves and control fluid flow. This pneumatic system enables the clearing of fluidic channels between experimental runs, actively removing residual samples and reagents to prevent cross-contamination while allowing the device to be reused, thereby reducing operational costs.
3Duration of action of stationary object
If complex pneumatic valve systems are added to enable reuse, then device reusability improves, but device complexity increases
Solution Approach 1:
The patent combines the pneumatic valve system directly into the microfluidic device structure, merging the actuation mechanism with the fluidic channels. The pneumatic layer is integrated such that valves are formed by recesses in the fluidic layer that interface with the pneumatic layer, eliminating the need for separate external valve components and reducing overall structural complexity while enabling device reuse.
4Ease of operation
If pneumatic layers are integrated into microfluidic devices, then valve actuation capability improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the microfluidic device into distinct functional layers: a fluidic layer containing the fluidic channels and valve recesses, a pneumatic layer with pneumatic channels for actuation, and a membrane layer separating the two. This segmented layered structure allows each layer to be manufactured independently using appropriate fabrication techniques, then bonded together, simplifying the overall manufacturing process while enabling sophisticated valve actuation capability.
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 solution allows for efficient and cost-effective reuse of microfluidic devices by preventing cross-contamination and enabling precise control of fluid flow, enhancing the scalability and automation of chemical, biochemical, and biological analyses.
Implementation Method 1
a pneumatic layer configured to supply a positive or negative pressure... the pneumatic layer is configured to apply the positive or negative pressure to the membrane to deflect the membrane towards or away from the fluidic layer
Implementation Method 2
a membrane sandwiched between the pneumatic layer and the fluidic layer... to deflect the membrane towards or away from the fluidic layer
Data Source
AI summary
The present disclosure provides microfluidic device comprising microfluidic valves with low or substantially no dead volume. The valves may comprise an actuation layer, a fluidic layer and a membrane between the actuation layer and the fluidic layer. The fluidic layer may comprise a fluidic channel, which fluidic channel may have a cross-sectional area having a curved shape. The actuation layer may be configured to apply positive or negative pressure to the membrane to deflect the membrane towards or away from the fluidic layer. The membrane may comprise one or more polymeric layers.