Microfluidic Device With Compressible Sealing Material
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Solution Overview
Problem
Current microfluidic systems for combining multiple reagents in laboratory experiments, such as PCR, are complex, costly, and time-consuming, especially for combinatorial analysis, where multiple permutations of DNA samples and primers are required, and digital PCR systems are expensive and complex.
Innovation Solution
A microfluidic device with layers and channels that allow for the separation and sealing of fluid cavities, using a separating material that can be compressed or heated to allow fluid communication between cavities, facilitating efficient and cost-effective combination of reagents in multiple reaction chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional microfluidic systems are used for combinatorial analysis, then multiple reagent combinations can be achieved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The device is divided into multiple independent reaction chambers (e.g., 5 chambers) that can be individually filled with different reagent combinations. Each chamber operates independently, allowing combinatorial analysis without requiring a single complex integrated system. This segmentation enables versatile reagent combinations while keeping each chamber's structure simple and easy to manufacture.
2Manufacturing precision
If digital PCR systems are used for fluid division and isolation, then precise aliquot separation is achieved, but the system cost and complexity increase
Solution Approach 1:
The reaction chambers are pre-filled with reagents before the experiment begins. The sealing mechanism is pre-designed to divide the fluid into separate chambers, eliminating the need for complex real-time division mechanisms. This preliminary preparation achieves precise fluid isolation through simple structural design rather than complex active control systems.
Solution Approach 2:
The device uses a disposable sealing mechanism (e.g., aluminum foil or plastic wrap) that is inexpensive and single-use. This simple sealing approach provides sufficient fluid isolation for digital PCR applications without requiring expensive, complex, and reusable sealing systems. The disposable nature reduces contamination risk and simplifies the overall system design.
3Ease of operation
If manual or robotic pipetting is used for reagent combination, then reagent mixing is achieved, but the time consumption and operational complexity increase
Solution Approach 1:
Multiple reagents are combined within the same reaction chamber through a single sealing action. The sealing mechanism simultaneously isolates and combines reagents from different sources (e.g., DNA samples and primers) without requiring separate pipetting steps for each combination. This merging approach dramatically reduces the number of operations needed and eliminates time-consuming manual or robotic pipetting sequences.
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
Enables quick and inexpensive handling of multiple reagent combinations, reducing the cost per reaction while maintaining the robustness of more expensive systems, and allows for even division and isolation of fluid ingredients in digital PCR applications.
Implementation Method 1
compression of the first and second layers relative to one another causes sealing of the first channel and the second channel
Implementation Method 2
heating or dissolving of the at least one separating material causes removal of the fluid separation allowing for fluid communication between the first cavity and second cavity
Data Source
AI summary
Microfluidic devices of the present disclosure relate to quick and inexpensive microfluidic manipulation/handling. A number of channels may be supplied with fluid ingredient(s). In some embodiments, a number of protrusions as well as a sealing material may be disposed adjacent to the channels. When the channels are supplied with fluid ingredient(s), the channels may be partitioned into a number of separate cavities that are fluidly isolated from one another. For instance, a sealing material may be compressed so as to deform into the channels, obstructing fluid flow. In some embodiments, the channels supply fluid ingredients to a number of pre-formed cavities. Once the cavities are supplied with fluid ingredient, channels connecting the cavities may be sealed off; that is, the cavities may be subject to fluid isolation. When appropriate, contents within reaction chambers may be subject to further processing (e.g., thermal cycling, various analyses).