Membrane-Valved Microfluidic Channels for Stable Fluid Addition
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Solution Overview
Problem
Existing microfluidic systems struggle to add additional components to fluid flow without disturbing the existing flow conditions, which can adversely affect cells under investigation.
Innovation Solution
A microfluidic device with a substrate, channel system, and elastic membrane valves that allow controlled addition of fluids through valve seats, maintaining the existing flow conditions by precise mixing ratios and preventing disturbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional components (nutrient solutions, enzymes, medications) are added to the fluid flow, then the functionality and versatility of the microfluidic system is improved, but the existing flow conditions are disturbed, which worsens the cultivation conditions for cells
Solution Approach 1:
The microfluidic system is divided into multiple independent fluidic pathways, each controlled by its own valve. This segmentation allows individual components (nutrient solutions, enzymes, medications) to be added through separate channels without interfering with the main sample flow, thus maintaining flow stability while enhancing system functionality
Solution Approach 2:
Valves are introduced as intermediary components between the additional fluid sources and the main channel system. These valves act as mediators that control the timing and manner of fluid addition, ensuring that supplements are introduced without disturbing the existing flow conditions and cell cultivation environment
2Reliability
If the existing flow conditions are maintained to protect cells, then the cultivation conditions stability is improved, but the ability to add additional components flexibly is restricted
Solution Approach 1:
The system employs dynamically controllable valves that can be opened or closed at precise moments to add components only when needed. This dynamic control allows the system to maintain stable flow conditions during cell cultivation while providing flexible opportunities to introduce additional components according to experimental requirements
Solution Approach 2:
Multiple fluidic connections and valve assemblies are pre-configured in the device, allowing for flexible addition of various components at different stages of the experiment. The preliminary arrangement of these components enables researchers to adapt the system to different experimental needs without disrupting ongoing cell cultivation
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 control of fluid addition without disrupting existing flow conditions, ensuring consistent cultivation conditions for cells and samples.
Implementation Method 1
an elastic membrane (40) covering at least a part of the second side of the substrate (11) including the valve seats (31, 32). The actuator device (70) is configured to exert a force on the membrane (40)
Data Source
AI summary
A microfluidic device includes a substrate, a channel system arranged in the substrate, a first and a second fluidic connection for supplying a fluid into the channel system, the fluidic connections being arranged on a first side of the substrate, a first and a second valve seat, both formed in a second side of the substrate, which is opposite to the first side, and an elastic membrane covering at least a portion of the second side of the substrate including the valve seats, wherein the first valve seat is arranged such that the fluid can flow from the first connection through the first valve seat into the channel system, and wherein the second valve seat is arranged such that the fluid can flow from the second connection through the second valve seat into the channel system. A microfluidic system may include the microfluidic device and an actuator device.