Vacuum-Sealed Pneumatic Connectors for Microfluidic Pressure Control
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Solution Overview
Problem
Pneumatic control systems in microfluidic devices often experience improper pressure application and contamination issues due to imperfect sealing and manual cleaning requirements, affecting the accuracy and reliability of cell culture and analysis results.
Innovation Solution
The development of removable and secure pneumatic connectors that utilize existing vacuum forces or magnetic attachments to establish multiple connections with microfluidic devices, allowing for variable pressure control and incorporating filters to prevent backflow, thereby ensuring reliable and repeatable connections and reducing contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pneumatic control systems use traditional tubing connections to microfluidic devices, then the system structure is simple, but the sealing is imperfect leading to improper pressure application and contamination
Solution Approach 1:
The pneumatic connector is divided into separate components: a connector body with multiple ports, removable caps for each port, and integration with the microfluidic device. This segmentation allows each component to be optimized independently while ensuring proper sealing through precise mating surfaces and O-ring seals at each interface.
Solution Approach 2:
O-ring seals are introduced as intermediary elements between the connector body and the microfluidic device, and between individual ports and the connector body. These O-rings create reliable sealing interfaces that prevent gas leakage and contamination while maintaining the pneumatic pressure differential needed for device operation.
2Ease of repair
If removable pneumatic connectors are used, then contamination risk is reduced and cleaning is easier, but connection security and sealing reliability may be compromised
Solution Approach 1:
The connector design incorporates rounded features and complementary mating surfaces that guide proper alignment during connection. The curved geometry of the ports and corresponding recesses ensures that connectors mate in the correct orientation, maintaining sealing integrity while allowing easy removal and reattachment for cleaning or replacement.
Solution Approach 2:
The connector design allows users to easily remove and clean individual ports or entire connector assemblies without specialized tools. The simple snap-fit or threaded connections enable quick disassembly for cleaning, and the modular design allows replacement of only contaminated portions rather than the entire pneumatic system.
3Measurement precision
If multiple pneumatic connections are established simultaneously, then pressure control accuracy is improved, but the complexity of establishing and maintaining seals increases
Solution Approach 1:
The pneumatic connector is designed with multiple ports that can simultaneously establish independent pneumatic connections to different regions of the microfluidic device. Each port functions independently with its own sealing interface, allowing simultaneous control of multiple pneumatic actuators or pressure zones while maintaining uniform sealing standards across all connections.
Solution Approach 2:
Each port in the multi-port connector is designed with localized sealing features optimized for its specific function. The connector body incorporates individual O-ring seals, mating surfaces, and alignment features at each port location, allowing each connection to be optimized for its particular pressure requirements while maintaining overall system integrity through the unified connector structure.
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
The solution enhances user workflow, reduces the likelihood of malfunctions, and maintains the integrity of cell culture and analysis by providing secure, repeatable connections and efficient cleaning processes, improving the accuracy and reliability of microfluidic device operations.
Implementation Method 1
Pneumatic connectors may be removable and secured using an existing in-line vacuum force provided via the tubing and pneumatic control system
Implementation Method 2
In certain embodiments, the pneumatic connectors may be removable and secured using magnetic force
Data Source
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AI summary
In one embodiment, a removable pneumatic connector, comprises a body having a plurality of bores passing through, each bore surrounded by a sealing member on an inner surface of the body. A plurality of gas lines may be placed within a corresponding bore. A vacuum port is disposed on the inner surface of the body, and an outer seal on the inner surface of the body surrounds the sealing members and the vacuum port. A vacuum line may be placed within the vacuum port, and configured to deliver negative pressure to the vacuum port. A vacuum holding area is created in the volume between the outer seal and each of the sealing members when the inner surface of the body is placed against a substrate. When the vacuum line is activated, a vacuum is created within the vacuum holding area, creating a positive seal between the body and the substrate.