Microfluidic Reagent Release via Magnetic Membrane Actuation
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Solution Overview
Problem
Existing microfluidic systems require a pressure difference to establish a fluidic connection between valve chambers, limiting the release of reagents without external forces or controllable mechanisms.
Innovation Solution
A device with a substrate and two cavities sealed by a common cover, featuring a pin-shaped body that can be moved to form a fluidic connection between the cavities, allowing for reagent release independent of pressure differences through manual or external mechanical forces, using a deformable cover to create a cavity for fluid transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pressure difference is used to establish a fluidic connection between valve chambers, then the connection can be established, but the release of reagent without external force or independent control is not possible
Solution Approach 1:
The patent replaces the pressure-based mechanical control system with a magnetic field-based actuation system. A permanent magnet or electromagnet generates a magnetic field that directly actuates the membrane, eliminating the need for complex pressure control mechanisms and enabling independent reagent release control without requiring pressure differences between chambers.
Solution Approach 2:
The patent introduces a membrane as an intermediary element between the magnetic actuator and the fluidic chambers. The membrane translates magnetic field action into mechanical deformation, which in turn controls the fluidic connection between chambers, providing a decoupled control mechanism that operates independently of pressure differences.
2Reliability
If a membrane is lifted by fluid pressure to form a connection, then the connection is established, but release without sufficient pressure difference is not possible
Solution Approach 1:
The patent substitutes fluid pressure-based membrane actuation with magnetic field-based actuation. The magnetic field directly deforms the membrane to establish fluidic connections, eliminating the requirement for pressure differences and enabling operational independence from fluid pressure conditions.
Solution Approach 2:
The patent changes the actuation parameter from fluid pressure to magnetic field strength. By controlling the magnetic field intensity and distribution, the membrane can be selectively deformed to establish or break fluidic connections without requiring changes in fluid pressure, thereby achieving reliable connections with operational versatility.
3Productivity
If external force is used to release reagent, then reagent release is achieved, but independent operation without external devices is not possible
Solution Approach 1:
The patent replaces external mechanical actuation devices with an integrated magnetic actuation system. The magnetic field generator (permanent magnet or electromagnet) is incorporated into the device structure, eliminating the need for external mechanical forces and enabling self-contained, efficient reagent release operation.
Solution Approach 2:
The patent implements a self-service mechanism where the device contains its own actuation system. The integrated magnet and membrane assembly allows the device to control reagent release independently without requiring external mechanical intervention, achieving both high productivity and operational independence.
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 the controlled release of reagents from one cavity to another without the need for pressure differences, facilitating capillary transport and independent operation of the fluidic connection.
Implementation Method 1
The area of the cover that has been detached from the substrate can form a cavity, in particular a truncated cone and/or a microfluidically active cavity, between the cover and the substrate, which cavity in particular forms the fluidic connection of the cavities
Data Source
Figure 1~3
AI summary
The invention relates to a device (1), in particular a microfluidic system, in which two cavities (3) are arranged in close proximity to each other and are sealed with respect to each other by a common cover (4). A fluidic connection can be produced between the cavities (3) by moving a pin-shaped body (5) in the direction of the cover (4). It is thereby possible to release a reagent in a controlled manner without having to pressurize said reagent.