Microfluidic Device With Isolated Thermal Zone
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Solution Overview
Problem
Microfluidic devices with disparate designs often lack compatibility due to varying 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 handling.
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 is divided into distinct functional layers: a fluidics layer with microfluidic channels, a pneumatics layer with pneumatic channels, and an actuation layer with diaphragm valves. This segmentation allows each layer to be optimized independently while maintaining overall compatibility through standardized external dimensions and interfaces.
Solution Approach 2:
The device incorporates universal features including standardized external dimensions, standardized interface configurations for upstream and downstream connectivity, and multi-functional integration of fluidic control, pneumatic actuation, and thermal regulation capabilities within a single platform that can interface with various biochemical and chemical analysis systems.
2Ease of operation
If multiple layers are integrated to provide fluidic and pneumatic control, then fluid flow regulation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The device separates fluidic control functions into distinct layers: the fluidics layer contains microfluidic channels for sample and reagent flow, while the pneumatics layer contains pneumatic channels for actuating diaphragm valves. This segmentation allows each layer to be manufactured and optimized independently, reducing the cumulative precision requirements compared to integrating all functions in a single layer.
Solution Approach 2:
The actuation layer serves as an intermediary between the pneumatics layer and the fluidics layer, using diaphragm valves to translate pneumatic pressure changes into precise fluid flow control. This intermediary mechanism provides fine-grained fluid flow regulation while allowing the pneumatic and fluidic layers to be manufactured with relaxed tolerances.
3Temperature
If an isolated portion is added for thermal regulation, then temperature control capability is improved, but device complexity increases
Solution Approach 1:
The device incorporates an isolated portion within the fluidics layer that is physically separated from the main microfluidic channel network. This isolated portion can be selectively heated or cooled using integrated heating elements and thermal coupling mechanisms, providing localized thermal regulation without requiring redesign of the entire fluidic system.
Solution Approach 2:
The thermal regulation functionality is merged into the existing multi-layer structure by integrating heating elements within the fluidics layer or coupling them to the isolated portion. This approach combines thermal control capabilities with the fluidic and pneumatic layers already present, avoiding the need for separate thermal control devices and minimizing overall system 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 and enhances the processing and analysis of biochemical and chemical reactions by providing precise fluid control and thermal management, improving the efficiency of microfluidic operations.
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 thermal regulator comprises one or more resistive wires
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.