Vertical Microfluidic Cartridge Actuation for Bubble-Free Filling
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Solution Overview
Problem
Conventional microfluidic devices require an out-of-plane oil reagent container to generate the pressure head for bubble-free filling, increasing the overall height and complicating assembly and manufacturing due to additional components.
Innovation Solution
A vertically oriented microfluidic device with a single actuator plate in the XZ plane uses a in-plane oil reagent container to generate pressure head, simplifying assembly and reducing component count by employing a single rotational motion for multiple actuation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an out-of-plane oil reagent container is used to generate pressure head for bubble-free filling, then the pressure head is sufficient for controlled fluid filling, but the overall height of the microfluidic device increases and assembly complexity increases
Solution Approach 1:
The patent transitions from a conventional out-of-plane oil reagent container configuration to an in-plane configuration where the oil reagent container is positioned within the same plane as the primary channel. This dimensional change allows the pressure head to be generated without increasing the overall device height, thereby maintaining bubble-free filling while reducing assembly complexity and component count.
2Reliability
If an out-of-plane oil reagent container is used to generate pressure head, then sufficient pressure head is achieved, but the number of components increases
Solution Approach 1:
The patent merges the oil reagent container with the primary channel structure by positioning the oil reagent container in the same plane as the primary channel. This integration eliminates the need for separate out-of-plane container structures and reduces the overall component count while maintaining sufficient pressure head generation for controlled fluid filling.
3Reliability
If the depth of the container is increased along the Z axis to generate pressure head, then sufficient pressure head is achieved, but the overall height of the microfluidic device increases
Solution Approach 1:
The patent repositions the oil reagent container from an out-of-plane configuration (increasing Z-axis depth) to an in-plane configuration within the XY plane. This dimensional change generates sufficient pressure head without increasing the overall device height, as the pressure head is created through the in-plane arrangement rather than vertical depth.
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 configuration simplifies assembly and manufacturing processes while maintaining efficient fluid handling, reducing the number of components and steps required for sample-to-answer assays.
Implementation Method 1
a pressure head is generated by employing an oil reagent container that is taller or situated at a height greater than that of the primary channel. The oil emptying out of the oil reagent container is driven by the pressure head to sequentially fill each well on the microfluidic device
Implementation Method 2
two actuator plates are required in order to spatially orient, for example, magnets such that the magnetic particles can be resuspended in the reagent at the bottom of the well and transferred through the immiscible medium on the top of well and through the primary channel
Implementation Method 3
the hydrophobic coating layer on the walls of the microfluidic device can be optimized to result in a controlled and bubble-free filling of the primary channel with an oil interconnect layer
Data Source
AI summary
A sample-to-answer microfluidic system and method including a microfluidic instrument with a detection system for detecting target assay products, data display, vertically oriented receiving member for receiving a microfluidic cartridge and an actuator assembly including a vertically oriented actuator. The system also includes a microfluidic cartridge with reagent pouches including a flow through reagent pouch, reagent wells in fluidic connection with one another. Methods of using the sample-to-answer microfluidic system are also provided.