Microfluidic Bubble Bypass Structure for Laminar Bioassay Flow
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Solution Overview
Problem
The presence of foreign objects, particularly gas bubbles, in microfluidic systems interferes with laminar flow, affects fluidic response time, damages cell membranes, blocks channels, and displaces or concentrates analyte particles, posing challenges in bioassays due to the micrometric dimensions of these systems.
Innovation Solution
A microfluidic device with a bubble deflection structure that deflects gas bubbles along a bypass path outside the region of interest, allowing process liquid to flow through, while preventing gas bubbles from contacting sensitive substances within the region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gas bubbles are completely removed from the microfluidic system, then foreign object interference is eliminated, but the system complexity and operational difficulty increase
Solution Approach 1:
The patent extracts gas bubbles from the main flow path by introducing a bubble trap chamber that selectively captures and removes gas bubbles from the liquid stream. The bubble trap uses a dead-end chamber with specific geometry to allow bubbles to accumulate and be removed without affecting the continuous liquid flow through the microfluidic channel, thus eliminating bubble interference while maintaining system simplicity.
Solution Approach 2:
The patent introduces an intermediary bubble trap chamber between the liquid supply and the microfluidic channel. This intermediary component acts as a mediator that intercepts gas bubbles before they enter the sensitive channel regions. The bubble trap chamber serves as a buffer zone where bubbles are captured and removed, preventing them from reaching and interfering with the bioassay components in the microfluidic channel.
2Device complexity
If gas bubbles are allowed to remain in the microfluidic system, then system simplicity is maintained, but laminar flow is disrupted and analyte particles are displaced
Solution Approach 1:
The patent segments the microfluidic system into distinct functional zones: a bubble trap chamber for gas accumulation, a separation region where bubbles are removed from the liquid stream, and the microfluidic channel for controlled liquid flow. This segmentation allows the system to maintain simplicity in the channel design while ensuring flow stability through dedicated bubble management in separate compartments.
Solution Approach 2:
The patent applies preliminary action by pre-trapping and removing gas bubbles from the liquid stream before the liquid enters the microfluidic channel. The bubble trap chamber is positioned upstream to intercept bubbles in advance, ensuring that only bubble-free liquid reaches the channel. This preliminary bubble removal prevents disruption of laminar flow and protects analyte particles from displacement during the bioassay process.
3Manufacturing precision
If the microfluidic channel is designed to be bubble-free, then analyte particle integrity is maintained, but the channel geometry becomes more complex
Solution Approach 1:
The patent extracts the bubble management function from the main channel geometry by introducing a separate bubble trap chamber. This allows the microfluidic channel to maintain simple, precise geometry optimized for analyte flow and bioassay operations, while the bubble trap handles bubble removal in a dedicated compartment. The channel geometry remains straightforward with standard features, avoiding complex designs that would be needed to inherently prevent bubble formation throughout the entire system.
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
Ensures continuous laminar flow and protects sensitive substances from gas bubble interference without the need to completely remove all gas from the system, enabling efficient liquid separation and analysis.
Implementation Method 1
a bubble deflection structure (10) arranged in the microfluidic channel and adapted to deflect gas bubbles entering the microfluidic channel via the fluid inlet, such that said gas bubbles are guided through the microfluidic channel along at least one bubble path (22) formed outside the region of interest (16)
Data Source
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AI summary
The present invention relates to prevention of undesired interference of gas bubbles with substances/objects of interest in a microfluidic system. In one aspect the invention provides a microfluidic device (1) for bioassays, comprising: - a microfluidic channel for guiding a process liquid in a direction of fluid flow (F) from a fluid inlet of the microfluidic channel to a fluid outlet of the microfluidic channel via at least one region of interest (16) for bioassays within the microfluidic channel; - a bubble deflection structure (10) arranged in the microfluidic channel and adapted to deflect gas bubbles (20) entering the microfluidic channel via the fluid inlet, such that said gas bubbles (20) are guided through the microfluidic channel along at least one bubble path (22) formed outside the region of interest (16), while allowing process liquid entering the microfluidic channel via the fluid inlet to flow through the region of interest (16).