Microfluidic Device Reversible Fluid Sealant for Evaporation Control
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Solution Overview
Problem
Microfluidic devices face challenges in efficiently isolating and analyzing small populations or single cells over extended periods due to limitations in fluid manipulation and sealing within geometrically constrained environments, which can lead to evaporation and leakage issues.
Innovation Solution
A microfluidic device with a platform featuring a microstructure of channels and chambers, where a substrate is reversibly attached to cover the exposed face, allowing for non-permanent attachment and easy access, and a fluid sealant is introduced to isolate droplets within chambers, preventing evaporation and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure sealing is used to prevent evaporation and leakage, then sealing reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces mechanical high-pressure sealing systems with a chemical solution - introducing a fluid sealant that chemically or physically bonds to fill gaps and seal channels. This substitution eliminates the need for complex mechanical sealing components and high-pressure systems while achieving reliable sealing to prevent evaporation and leakage.
Solution Approach 2:
The patent changes the sealing mechanism from relying on high pressure (physical parameter) to using a fluid sealant's bonding or filling properties (chemical/physical property change). The sealant modifies the sealing parameter by transforming from a mechanical constraint to a material-based seal that prevents leakage without requiring high pressure.
2Reliability
If permanent sealing is used to prevent leakage, then sealing reliability is improved, but ease of operation deteriorates due to inability to access chambers
Solution Approach 1:
The patent makes the sealing system dynamic by using a reversible sealant. The sealant can be applied to create seals when needed and removed or deactivated when chamber access is required. This dynamic property allows the system to switch between sealed and accessible states, maintaining both sealing reliability and operational flexibility.
Solution Approach 2:
The patent employs a sealant that can be discarded (removed or deactivated) when chamber access is needed. The reversible nature of the sealant allows it to be applied for sealing purposes and then removed or neutralized to enable access, without permanently compromising the device structure or requiring complex unsealing mechanisms.
3Measurement precision
If geometric constraints are applied to create microfluidic environment, then measurement precision is improved, but fluid manipulation capability worsens due to limited space
Solution Approach 1:
The patent introduces a fluid sealant as an intermediary substance that enables precise fluid manipulation in constrained geometries. The sealant fills gaps and creates controlled barriers within the microfluidic channels, allowing precise control of fluid movement and isolation without requiring complex mechanical manipulators that would not fit in the constrained space.
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 efficient isolation and analysis of small volumes of sample fluids, maintaining stability and preventing evaporation, allowing for long-term monitoring of single cells and biochemical processes without the need for high-pressure sealing.
Implementation Method 1
Some known microfluidic devices use capillary action to control or manipulate fluids
Implementation Method 2
The microfluidic environment may differ from the non-microfluidic environment in such ways as laminar flow, surface tension, energy dissipation, diffusion, and fluidic resistance
Data Source
Figure 1
Figure 2A~2E
Figure 3A
AI summary
A microfluidic device includes a platform with a microstructure. The microstructure include a primary channel and a plurality of chambers that open to the primary channel to enable a sample fluid that is loaded into the device via the primary channel to flow into the chambers. Each chamber has a volume that is less than tens of nanoliters and is connected by a vent to a secondary channel of the microstructure. A width of the vent is configured to enable a gas to escape from the chamber to the secondary channel while inhibiting flow of the sample fluid from the chamber into the secondary channel.