Thermal Transfer Structures for Microfluidic Fluid Transport
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Solution Overview
Problem
Conventional microfluidic processing devices require human intervention or robotic manipulation for fluid transfer between chambers, leading to errors, complexity, and high costs.
Innovation Solution
The use of thermally-activated vacuum to transfer fluids within a microfluidic processing device, where temperature changes in thermal transfer structures create pressure differentials to move analytes between chambers, reducing the need for manual or robotic intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual pipetting or robotic manipulation is used to transfer fluid between chambers, then fluid transfer can be achieved, but the complexity and cost of the system increases
Solution Approach 1:
The patent replaces mechanical fluid transfer systems (manual pipetting or robotic manipulation) with a thermally-driven vacuum system. Temperature changes in the thermal transfer structure create pressure differentials that automatically move analyte between chambers, eliminating the need for mechanical intervention and reducing system complexity
Solution Approach 2:
The system uses self-service by allowing the thermal transfer structure to automatically generate the vacuum pressure needed for fluid transfer through temperature changes. The analyte moves autonomously in response to pressure differentials created by heating and cooling cycles, without requiring external mechanical control
2Ease of operation
If manual pipetting or robotic manipulation is used to transfer fluid between chambers, then fluid transfer can be achieved, but the cost of the system increases
Solution Approach 1:
The patent replaces expensive mechanical systems (manual or robotic pipetting equipment) with a simple thermal management system. The cost is reduced by using temperature control to create pressure differentials, which is a more economical approach than implementing and maintaining robotic manipulation systems
3Productivity
If conventional fluid transfer methods are used, then fluid can be moved between chambers, but errors may occur during transfer
Solution Approach 1:
The system improves reliability by using self-service automatic fluid transfer driven by pressure differentials. The analyte moves autonomously in response to temperature-induced pressure changes, eliminating human intervention and the errors associated with manual pipetting, while maintaining efficient processing
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 method enables efficient and automated fluid transfer within microfluidic processing devices, minimizing errors and costs while enhancing processing efficiency through thermally-driven vacuum mechanisms.
Implementation Method 1
temperature changes in thermal transfer structures create pressure differentials
Implementation Method 2
thermally-activated vacuum to transfer fluids
Data Source
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Figure 3~4B
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AI summary
Processing devices that include one or more process arrays with thermal transfer structures that can be used alone or in conjunction with gravity/rotation to transport fluids within a microfluidic system. The thermal transport function can be accomplished by changing the temperature of one or more chambers (270) 4to create a vacuum to draw fluids in selected directions within the process array. The methods and apparatus of the present invention may provide the ability to move fluids in a direction that is against the direction of gravity or any centrifugal forces generated by rotating a processing device using the thermal transfer structures. In other words, fluids may be moved against the direction of gravity or towards the axis of rotation using the thermally-activated vacuum.