Microfluidic Chip Thermal Shelf and Diaphragm Valve Integration
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Solution Overview
Problem
Microfluidic devices with disparate designs often lack compatibility due to variations in external and internal dimensions, making them incompatible with upstream and downstream devices, and face challenges in processing and analyzing biochemical and chemical reactions effectively.
Innovation Solution
A microfluidic device comprising a fluidics layer, a pneumatics layer, and an actuation layer with diaphragm valves that regulate fluid flow, featuring an isolated portion for microfluidic channels not covered by the pneumatics layer, allowing for thermal regulation and efficient fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If microfluidic devices are designed with standardized dimensions and interfaces, then compatibility with upstream and downstream devices is improved, but device complexity increases due to the need for precise manufacturing and integration of multiple layers
Solution Approach 1:
The microfluidic device incorporates standardized external dimensions (e.g., 24mm x 24mm footprint) and universal interface features that enable compatibility with multiple upstream purification devices and downstream analytical instruments. The standardized well plates, fluidic ports, and mechanical interfaces allow the same device design to be used across different applications and instrument platforms, achieving universality without requiring custom integration for each device pair.
Solution Approach 2:
The device is divided into distinct functional layers including a substrate layer, microfluidic channel layer, valve layer, and seal layer, with each layer manufactured separately and then assembled. This segmentation allows each layer to be optimized independently for its specific function while maintaining standardized external dimensions, reducing the complexity of integrating multiple functions into a single monolithic structure.
2Ease of operation
If multiple layers are integrated to provide precise fluid control, then fluid handling capability is improved, but manufacturing difficulty increases due to alignment and bonding requirements
Solution Approach 1:
Alignment features such as registration marks, protrusions, and recesses are pre-formed on each layer during manufacturing before assembly. These preliminary alignment structures guide the precise positioning of layers during the bonding process, ensuring accurate fluidic pathway alignment without requiring complex real-time adjustment mechanisms during assembly.
Solution Approach 2:
A seal layer is introduced as an intermediary component between the microfluidic channel layer and the valve layer, providing a standardized bonding interface that simplifies the joining process. The seal layer accommodates minor dimensional variations and ensures reliable sealing without requiring ultra-precise alignment, thereby reducing manufacturing difficulty while maintaining fluid control integrity.
3Temperature
If an isolated portion is added for thermal regulation, then temperature control capability is improved, but device complexity increases due to additional structural components
Solution Approach 1:
Thermal regulation is achieved by extending the substrate layer in a planar direction to create an isolated portion that protrudes from the main device body. This extended region provides additional surface area for thermal contact with heating or cooling elements without requiring vertical stacking of thermal control layers, thereby adding temperature control capability while minimizing increases in three-dimensional device complexity.
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
The device enables compatible integration with other devices, enhances fluid flow control, and facilitates efficient processing and analysis of biochemical and chemical reactions by providing precise thermal regulation and fluid management.
Implementation Method 1
activation of the valve regulates fluid flow in a fluidics channel
Implementation Method 2
the microfluidic device further comprises a heat spreader in thermal contact with the isolated portion
Implementation Method 3
the isolated portion of the microfluidic device is in thermal contact with a thermal regulator
Data Source
AI summary
This invention provides microfluidic devices that comprise a fluidics layer having microfluidic channels and one or more regulating layers that regulate the movement of fluid in the channels. The microfluidic devices can be used to mix one or more fluids. At least a portion of the fluidics layer can be isolated from the regulating layer, for example in the form of a shelf. Such isolated portions can be used as areas in which the temperature of liquids is controlled. Also provided are instruments including thermal control devices into which the microfluidic device is engaged so that the thermal control device controls temperature in the isolated portion, and a movable magnetic assembly including magnets with shields so that a focused magnetic field can be applied to or withdrawn from the isolated portion or any other portion of the microfluidic device. Also provided are methods of mixing fluids. The methods include stacking a plurality of alternating boluses of different liquids in a microfluidic channel, and moving the stacked boluses through the channel. In another method, the boluses are moved into a diaphragm valve having a volume able to accommodate several boluses, and then pumping the liquids out of the valve.