Microfluidic Analysis Chamber Isolation for Bubble-Free Sampling
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Solution Overview
Problem
The presence of bubbles in microfluidic networks, generated by pneumatic activation of membranes and high temperatures, disrupts analysis and leads to erroneous results in microfluidic devices.
Innovation Solution
A process that isolates the analysis chamber by maintaining input and output valves closed, opens an intermediate valve to allow liquid sample analysis, and uses a protective chamber to trap bubbles generated by pneumatic actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pneumatic actuation is used to control microfluidic valves, then valve control reliability is improved, but bubble generation increases due to membrane porosity
Solution Approach 1:
The microfluidic network is segmented into distinct functional zones: a reaction zone containing the analysis chamber isolated from bubble generation, and a bubble management zone including protection chambers and bubble traps. This spatial segmentation allows pneumatic valves to be actuated reliably while confining bubbles to specific regions away from the analysis chamber.
Solution Approach 2:
Protection chambers and bubble traps are introduced as intermediary elements between the pneumatic valve system and the analysis chamber. These intermediaries capture and contain bubbles generated by pneumatic actuation, preventing them from entering the analysis chamber while allowing the pneumatic system to continue functioning.
2Productivity
If high temperature incubation is applied to promote biological reactions, then reaction efficiency is improved, but bubble formation increases
Solution Approach 1:
The system converts the harmful effect of temperature-induced bubble formation into a beneficial outcome by directing bubbles toward protection chambers and bubble traps. The same thermal energy that causes bubble formation is harnessed to drive biological reactions, while the resulting bubbles are systematically captured and isolated from the analysis chamber.
3Ease of operation
If deformable membranes are made porous to air for pneumatic control, then valve actuation is improved, but bubble propagation through the network increases
Solution Approach 1:
Bubbles are extracted and removed from the main fluid pathway by introducing dedicated bubble management components such as protection chambers and bubble traps. These components selectively capture bubbles that propagate through the porous membranes, separating the bubble management function from the main fluid flow and analysis functions.
4Duration of action of stationary object
If long duration pneumatic pressure is applied to maintain valve state, then valve stability is improved, but bubble injection into the network increases
Solution Approach 1:
Protection chambers and bubble traps are pre-positioned in the fluid pathway upstream of the analysis chamber. Before bubbles can be injected into the analysis chamber by prolonged pneumatic actuation, they are captured by these pre-positioned protective elements, allowing valves to maintain stable states for extended durations without compromising analysis chamber integrity.
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 process effectively prevents bubbles from entering the analysis chamber, ensuring accurate and reliable analysis by maintaining a bubble-free environment during liquid sample analysis.
Implementation Method 1
Each microfluidic valve being pneumatically actuated and comprising a cavity and a deformable membrane inside the cavity, so as to confer two distinct states to the valve, an open state in which it allows a liquid to pass and a closed state in which it blocks the passage of the liquid
Implementation Method 2
A deformable membrane is controlled to deform in said chamber in order to confer two distinct states to the capsule, a first state in which the inlet channel and the outlet channel communicate with each other through the chamber so as to allow a transfer of fluid
Implementation Method 3
using the protective microfluidic chamber to trap the bubbles generated by the pneumatic actuation of at least one microfluidic valve of the microfluidic device
Implementation Method 4
Similarly, it is known that high temperatures (60°C-90°C) can promote the formation of bubbles in a microfluidic network
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
The invention relates to a method for analyzing a liquid sample, implemented in a microfluidic device comprising several microfluidic elements connected in series by microfluidic channels, from upstream to downstream, between a microfluidic inlet (1) and a microfluidic outlet (2) opening to the outside. Said method consists of: - Isolating a microfluidic analysis chamber (C2) by maintaining a microfluidic inlet valve (V1) and a microfluidic outlet valve (V4) in the closed state during an analysis of the liquid sample in said microfluidic analysis chamber (C2), - Using a protective microfluidic chamber (C3) to trap the bubbles generated by the pneumatic actuation of at least one microfluidic valve of the microfluidic device.