Microfluidic Flow Controller With Deformable Channel Shutoff
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Solution Overview
Problem
Current microfluidic devices face challenges in effectively controlling fluid flow at a small scale due to limitations in precision and efficiency of fluid communication paths within their channels.
Innovation Solution
A microfluidic flow controller is developed, comprising a substrate with open fluid channels and a flexible layer that provides a communication path but deforms to inhibit flow when pressed, using materials like elastomers and polymers, allowing for precise control of fluid flow through deformable channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flexible layer is used to control fluid flow by deformation, then flow control precision is improved, but device complexity increases
Solution Approach 1:
The patent employs a flexible layer with a flexible fluid channel that deforms under applied force to control fluid flow. The flexible layer is positioned over substrate fluid channels, and when pressed, it deforms to inhibit fluid communication between channel fluid ports, enabling precise flow control through a simple flexible membrane structure rather than complex mechanical valves.
2Reliability
If the flexible layer covers the entire substrate surface, then flow control reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The flexible layer is implemented as a patch rather than covering the entire substrate surface. This patch is positioned to cover only the specific channel fluid ports that require flow control, reducing manufacturing complexity while maintaining flow control reliability for the targeted channels.
3Adaptability or versatility
If channel fluid ports are positioned deep within substrate channels, then device integration is improved, but fluid communication efficiency deteriorates
Solution Approach 1:
The patent positions channel fluid ports at the substrate surface rather than deep within channels. This dimensional change from internal channel positioning to surface positioning improves fluid communication efficiency by reducing flow path length and resistance, while the flexible layer patch provides the necessary integration for flow control.
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 solution enables precise control of fluid flow with minimal dead volume, reducing the risk of fluid stagnation and air bubble formation, and allows for efficient operation with lower actuation forces, maintaining functionality over numerous cycles.
Implementation Method 1
a flexible layer having formations defining a flexible fluid channel which, when the flexible layer is positioned over the substrate so as to cover at least the channel fluid ports, provides a fluid communication path between the channel fluid ports but which, when a force is applied to press the flexible layer towards the substrate, deforms so as to inhibit fluid communication between the channel fluid ports
Data Source
AI summary
A microfluidic flow controller comprising a substrate having formations defining two or more fluid channels having channel fluid ports which are open at an outer surface of the substrate; and a flexible layer having formations defining a fluid channel which, when the flexible layer is positioned over the substrate so as to cover at least the channel fluid ports, provides a fluid communication path between the channel fluid ports but which, when a force is applied to press the flexible layer towards the substrate, deforms so as to inhibit fluid communication between the channel fluid ports.