Microfluidic Temperature Cycling via Segmented Loops
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Solution Overview
Problem
Existing microfluidic devices for temperature-cycling, such as those used in PCR amplification, often require large space due to single serpentine channels and lack flexibility in adjusting the number of temperature cycles, with separate components for temperature control, DNA sensing, and fluid pumping.
Innovation Solution
The use of temperature-cycling microfluidic devices that circulate fluid through multiple loops, integrating fluid actuators, heaters, and sensors for efficient space use, allowing for quick and repeated temperature cycling between high and low temperatures, and incorporating a heat exchange substrate for enhanced heat transfer and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single serpentine channel is used for temperature cycling, then the device can perform PCR amplification, but the device occupies large space and lacks flexibility in adjusting temperature cycles
Solution Approach 1:
The single serpentine channel is divided into multiple separate loops (first loop, second loop, third loop) that can independently cycle fluid. Each loop can be configured with different numbers of temperature cycles, allowing flexible adjustment without increasing overall device footprint. The segmentation enables parallel temperature cycling operations across multiple channels.
Solution Approach 2:
The patent transitions from a two-dimensional serpentine layout to a multi-loop three-dimensional configuration where loops are arranged in parallel across the device substrate. This dimensional reorganization allows multiple temperature cycles to occur simultaneously in different spatial locations, improving adaptability while maintaining compact device area.
2Reliability
If separate components are used for temperature control, DNA sensing, and fluid pumping, then each function can be optimized independently, but the device complexity increases
Solution Approach 1:
The patent integrates temperature control elements (heaters), DNA sensing elements (fluorescent detectors), and fluid pumping elements (peristaltic actuators) directly into the microfluidic device substrate. The heaters are positioned along the loops, sensors are embedded in the fluid path, and actuators are integrated at the fluid injection points, creating a unified device that reduces component count while maintaining functional optimization.
Solution Approach 2:
The device substrate serves multiple functions simultaneously: it provides the structural framework for the loops, contains the heating elements for temperature control, houses the fluorescent sensors for DNA detection, and incorporates the peristaltic actuators for fluid handling. This multi-functional integration reduces device complexity while preserving the reliability of each individual function.
3Use of energy by moving object
If fluid is circulated through multiple loops for temperature cycling, then heat transfer efficiency improves, but the device requires more complex control mechanisms
Solution Approach 1:
The patent incorporates fluorescent sensors within the loops that continuously monitor DNA amplification progress and temperature conditions. This feedback information is used to dynamically adjust heater power, actuator frequency, and flow rate in real-time, optimizing heat transfer efficiency while managing control complexity through automated feedback loops.
Solution Approach 2:
The peristaltic actuators operate at controlled frequencies to periodically pump fluid through the loops, creating rhythmic flow patterns that enhance heat transfer efficiency. The periodic action is synchronized with temperature cycling requirements, and the frequency can be adjusted based on feedback from sensors, balancing heat transfer performance with control mechanism 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
This approach enables more efficient use of space, flexible temperature control, and improved mixing and heat transfer, allowing for precise temperature cycling and efficient PCR amplification with reduced device size and complexity.
Implementation Method 1
a heat exchange substrate to cool the fluid to a lower temperature than the driver chip
Implementation Method 2
heat exchange substrate for enhanced heat transfer and control
Implementation Method 3
a driver chip to heat the fluid to a high temperature to denature the nucleic acid
Implementation Method 4
fluid actuators to pump fluid through the microfluidic loops
Data Source
AI summary
The present disclosure is drawn to temperature-cycling microfluidic devices. In one example, a temperature-cycling microfluidic device can include a driver chip having a top surface and a heat exchange substrate having a top surface coplanar with the top surface of the driver chip. A fluid chamber can be located on the top surface of the driver chip. A first and second microfluidic loop can have fluid driving ends and fluid outlet ends connected to the fluid chamber and can include portions thereof located on the top surface of the heat exchange substrate. A first and second fluid actuator can be on the driver chip. The first and second fluid actuators can be associated with the fluid driving ends of the first and second microfluidic loops, respectively, to circulate fluid through the first and second microfluidic loops.