Microfluidic Reservoir Interface for Cross-Contamination Control
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Solution Overview
Problem
Microfluidic systems face challenges with high maintenance and operation costs due to cross-contamination issues, requiring cumbersome cleaning and disposal of components, which leads to system downtimes and inaccurate results in applications like medical diagnostics and biomolecular forensics.
Innovation Solution
A microfluidic device with a reservoir interface that uses external gas pressures to generate fluid flow within the microfluidic chip, avoiding liquid contact with external components and allowing for easy replacement of the device without cleaning or disposing of peripheral components, thus preventing cross-contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional microfluidic systems are used with external tubing and manifold components, then fluid processing can be performed, but cross-contamination occurs between processing operations requiring cleaning or disposal of components
Solution Approach 1:
The patent extracts the fluid processing function into a self-contained microfluidic chip that can be easily replaced. The chip includes integrated reservoirs, channels, and mixing structures, allowing the entire fluid processing system to be discarded and replaced rather than cleaned, thus preventing cross-contamination while maintaining operational simplicity
Solution Approach 2:
The microfluidic chip is designed as a disposable component that can be easily replaced after use. This eliminates the need for cleaning complex external tubing and manifold components, preventing cross-contamination between processing operations while reducing maintenance time and operational complexity
2Reliability
If cleaning processes are implemented to prevent cross-contamination, then accurate results can be obtained, but system downtime increases and operational costs rise
Solution Approach 1:
The patent extracts the fluid processing function into a self-contained microfluidic chip that can be easily replaced. The chip includes integrated reservoirs, channels, and mixing structures, allowing the entire fluid processing system to be discarded and replaced rather than cleaned, thus preventing cross-contamination while maintaining operational simplicity
Solution Approach 2:
The microfluidic chip is designed as a disposable component that can be easily replaced after use. This eliminates the need for cleaning complex external tubing and manifold components, preventing cross-contamination between processing operations while reducing maintenance time and operational complexity
3Ease of operation
If external pressure sources are used to drive fluid flow, then fluid transport can be achieved, but liquid contact with external components causes contamination
Solution Approach 1:
The patent merges the pressure source function directly into the microfluidic chip by integrating gas permeable membranes and gas channels within the chip structure. This allows external gas pressure to be applied directly to liquid-containing chambers without requiring external tubing that would contact and contaminate the liquid samples
Solution Approach 2:
The patent uses gas permeable membranes as an intermediary between the external gas pressure source and the liquid samples. The membranes allow gas pressure to transmit force to the liquid without direct contact, preventing contamination while maintaining fluid flow control
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
This solution minimizes post-process cleaning, reduces system downtimes, and prevents cross-contamination, enabling efficient and accurate processing without the need for extensive cleaning or disposal of components, thereby improving operational efficiency and reducing costs.
Implementation Method 1
The gas interface may be configured to be operably coupled to a gas channel portion of a microfluidic device. The liquid pipe may be configured to transport the liquid between the reservoir and the liquid channel portion in response to a fluid flow through the liquid pipe and the gas interface.
Data Source
AI summary
A microfluidic assembly may include a microfluidic chip operably coupled to a device source pressure port and a device relief pressure port, first and second input reservoirs, an output reservoir, and a reservoir interface. The microfluidic chip may include a microfluidic circuit configured to support a fluid flow that includes a gas flow and a liquid flow within the microfluidic circuit. The reservoir interface may be configured to operably couple the first and second input reservoirs to the microfluidic circuit. The device source pressure port may be configured to receive a source pressure to generate the fluid flow through the microfluidic circuit and cause a mixing of liquids to form an output liquid for delivery to the output reservoir via the fluid flow. The first liquid, the second liquid, and the output liquid need not contact the device source pressure port or the device relief pressure port during the mixing.