Microfluidic Filter Chamber Bubble-Free Filling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microfluidic systems face challenges in bubble-free filling and clogging of filters during liquid filtration processes, leading to inefficient filtration and potential for undesired reactions due to trapped air bubbles and uneven flow.
Innovation Solution
A microfluidic filter chamber with an adjustable ventilation channel and valve system, featuring widened inlet and outlet channels with a funnel-shaped cross-section, allows for controlled liquid flow and bubble-free filling by regulating the passage of liquids and gases, preventing clogging and ensuring homogeneous flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual pipetting and centrifugation are used to fill filters, then the filling process is simple, but air bubbles are trapped and the filter becomes clogged
Solution Approach 1:
The invention extracts and removes air bubbles from the liquid before the liquid reaches the filter. A separate air removal channel is provided that allows air bubbles to be extracted from the liquid stream, preventing them from entering the filter and causing clogging, while the liquid continues to flow through to the filter without interruption
Solution Approach 2:
The filling channel is segmented into multiple functional sections: a liquid introduction section, an air removal section with separate air and liquid channels, and a filter connection section. This segmentation allows independent control of liquid flow and air removal, enabling bubble-free filling while maintaining operational simplicity
2Productivity
If the inlet channel is narrow to maintain low fluid resistance, then fluid flow is efficient, but homogeneous flow onto the filter cannot be ensured
Solution Approach 1:
The inlet channel features an asymmetric cross-sectional design that transitions from a narrower entry section to a wider distribution section. This asymmetric geometry allows the channel to maintain lower overall resistance while creating a broader flow distribution area that ensures homogeneous liquid flow onto the filter surface
Solution Approach 2:
The inlet channel transitions from a two-dimensional narrow passage to a three-dimensional expanded distribution region before reaching the filter. This dimensional transition allows the liquid flow to spread out and distribute evenly across the filter surface, achieving homogeneous flow while maintaining efficient fluid resistance through the tapered transition design
3Reliability
If the ventilation channel is always open to allow air escape, then bubble-free filling is achieved, but liquid flow cannot be precisely regulated
Solution Approach 1:
The ventilation channel is designed with a dynamically controllable valve that can adjust its opening degree. This allows the system to switch between different operational modes: fully open for bubble-free filling, partially open for controlled venting during filtration, and closed when precise liquid flow regulation is needed. The dynamic adjustability resolves the contradiction by providing context-dependent functionality
Solution Approach 2:
A valve mechanism serves as an intermediary between the ventilation channel and the liquid flow path. This intermediary component allows selective control of air escape while maintaining precise regulation of liquid flow. The valve acts as a mediator that can independently control gas and liquid phases, enabling both bubble-free filling and precise flow regulation as needed
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
Enables precise regulation of fluid flow, prevents bubble entrapment, ensures complete rinsing, and maintains consistent fluid resistance, facilitating controlled reagent exchange and preventing foam formation, thus enhancing the efficiency and reliability of microfluidic filtration processes.
Implementation Method 1
a filter (3), a ventilation channel (4), an inlet channel (1) and an outlet channel (6), the filter (3) being inserted into the inlet channel (1)
Implementation Method 2
The liquid flow is driven by capillary forces
Data Source
Figure 1a~1b
Figure 2~3
Figure 4
AI summary
The present invention relates to a microfluidic filter chamber having a controllable deaeration channel and use thereof. The invention also relates to a fluidic system for bubble-free filling of a microfluidic filter chamber and for filtering liquids, a method for bubble-free filling of a microfluidic filter chamber and a method for filtering liquids.