Microreactor Vent Channels for Air Bubble Removal
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Solution Overview
Problem
In microreactors used for biochemical analyses, air bubbles can be easily encapsulated in reaction chambers, leading to instability and leakage, compromising the analysis by affecting volume, reagent balance, and pressure due to capillary forces and chamber geometry, resulting in a reduced sample volume available for processing.
Innovation Solution
Incorporation of vent channels that communicate with reaction chambers and detection chambers through capillary interconnections, with strategically placed inlets and outlets to evacuate air bubbles and prevent leakage, utilizing a capillary 'stop valve' effect to ensure complete sample usage in the reaction chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vent channels are added to remove air bubbles, then air removal capability is improved, but device complexity increases
Solution Approach 1:
The microreactor is divided into separate functional components: reaction chambers for biochemical analysis and detection chambers for reading results, connected by fluidic pathways. The vent channels are integrated as separate pathways that diverge from the main sample flow path, allowing independent air removal without interfering with the analytical process.
Solution Approach 2:
The vent channels act as intermediary structures that provide a dedicated pathway for air bubbles to escape from the reaction chambers to the detection chamber or external environment. These channels serve as a mediator between the reaction chamber and the external world, removing harmful air bubbles without disrupting the sample analysis flow.
2Productivity
If capillary interconnections are used to transfer samples, then sample transfer efficiency is improved, but air bubble encapsulation increases
Solution Approach 1:
The vent channels are designed to be active during the sample loading and transfer process, performing the preliminary action of removing air bubbles before they can be encapsulated by capillary forces in the reaction chambers. This preventive measure ensures that the sample volume is not reduced by trapped air bubbles.
Solution Approach 2:
The vent channels extract air bubbles from the sample stream and reaction chamber environment, separating the harmful air phase from the useful liquid sample phase. By actively removing air bubbles through the vent channels, the system prevents air from being trapped in the capillary interconnections and reaction chambers.
3Measurement precision
If reaction chamber volume is reduced for microanalysis, then analysis precision is improved, but air bubble impact increases
Solution Approach 1:
The system utilizes pneumatic principles by designing vent channels that leverage pressure differentials and gas-liquid separation to remove air bubbles from the microvolume samples. The vent channels are positioned and dimensioned to exploit pneumatic forces that naturally separate air bubbles from the liquid sample, enabling effective air removal in micro-scale volumes.
Solution Approach 2:
The vent channels provide an additional spatial dimension for air bubble removal, creating a separate three-dimensional pathway that is distinct from the planar reaction chamber and capillary interconnection layers. This extra dimension allows air bubbles to escape vertically or laterally from the sample flow path, effectively removing them without compromising the precision of the microanalysis.
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 vent channels effectively remove air bubbles from reaction chambers, maintaining the desired sample volume and preventing leakage, ensuring accurate and complete processing of biological samples without the need for moving parts, thus enhancing the reliability of biochemical analyses.
Implementation Method 1
Incorporation of vent channels that communicate with reaction chambers and detection chambers through capillary interconnections, with strategically placed inlets and outlets to evacuate air bubbles and prevent leakage, utilizing a capillary 'stop valve' effect
Data Source
AI summary
A microreactor for performing chemical reactions, includes a body, a first chamber and a second chamber, both formed in the body. Interconnections are provided for fluidly coupling the first chamber and the second chamber through the body. The microreactor also includes a venting passage formed in the body and having a venting outlet in the second chamber and at least one venting inlet in the first chamber, at a location where formation of bubbles is expected upon introduction of a liquid in the first chamber.