Microfluidic Valve Membrane Reagent Storage
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Solution Overview
Problem
Microfluidic devices face challenges in efficiently integrating and controlling reagents for long-term storage and reaction, particularly in maintaining reagent stability and compatibility with various solvents, while ensuring chemical robustness and easy release mechanisms.
Innovation Solution
A microfluidic device with a storage compartment, reaction area, and valve arrangement, featuring a deformable membrane that covers storage and reaction areas, allowing for controlled communication between compartments using dot matrix style pin-operated valves, enabling reagent reconstitution and solvent release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If reagents are stored in liquid form in microfluidic devices, then immediate availability for reaction is improved, but chemical stability and shelf life deteriorate
Solution Approach 1:
The patent applies parameter changes by storing reagents in lyophilized (freeze-dried) form rather than liquid form, fundamentally changing the physical state parameter. This allows reagents to be stored at room temperature with enhanced chemical stability while enabling rapid reconstitution by adding liquid solvent through the microfluidic channel when needed, thus resolving the contradiction between stability and availability.
2Adaptability or versatility
If multiple reagent storage compartments are integrated into a single microfluidic chip, then device versatility is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the microfluidic chip into distinct functional compartments: separate storage compartments for different reagents, a reaction compartment, and interconnected microfluidic channels. Each compartment is independently designed and sealed with membranes, allowing multiple reagents to be stored and manipulated separately while maintaining overall system integration and controlled fluid flow between compartments.
Solution Approach 2:
The patent applies the nested doll principle by integrating valve mechanisms within the microfluidic channel structure itself. The valves are formed by localized membrane deformations controlled by external pins or actuators, nesting the valve functionality directly into the channel walls rather than adding separate valve components, thus reducing overall device complexity while maintaining versatility.
3Stability of the object's composition
If a membrane seals the storage compartment to maintain chemical stability, then reagent protection is improved, but flow control between compartments becomes more difficult
Solution Approach 1:
The patent applies dynamics by using flexible membranes that can deform in response to applied forces. The membranes are initially in a relaxed state providing stable sealing, but when external pins or actuators apply force, the membranes deform dynamically to open or close fluid pathways. This dynamic behavior allows the same membrane structure to provide both stable sealing during storage and controlled flow during operation.
Solution Approach 2:
The patent applies flexible shells and thin films by using thin membrane structures to seal the storage compartments and form the valve mechanisms. These flexible membranes can be deformed by external actuators to control fluid flow between compartments while maintaining hermetic sealing when in the closed position, thus providing both protection and controllability.
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 long-term storage of reagents at room temperature, ensures chemical robustness across various solvents, and facilitates controlled reagent release for efficient reactions, improving the homogeneity and usability of reagents in microfluidic systems.
Implementation Method 1
the membrane adapted to cover at least portion of the storage compartment, reaction area, and microfluidic channel, the membrane being also adapted to seal the at least portion of storage compartment, reaction area, and microfluidic channels
Implementation Method 2
the valve arrangement, to control opening and closing of the microfluidic channel
Implementation Method 3
allowing for the storage of reagents in lyophilized form and their reconstitution as needed
Data Source
AI summary
In a fluidic device with a storage compartment communication is allowed between the storage compartment and other portions of the device. The communication is controlled through a valve arrangement and a membrane covering the compartment. The valve arrangement can be provided through a sealing clamp with clamp fingers. The clamp fingers control communication between the storage compartment and remaining portions of the fluidic device.