Uniform-Pressing Micro-Valve for Clog-Resistant Capillary Flow
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Solution Overview
Problem
Commercially available miniaturized valves for capillary electrophoresis often clog when using buffers with high salt concentrations and are expensive to repair, requiring extensive washing and being prone to leakage and breakdown, especially when handling organic solvents and high-pH buffers, which leads to irreproducible results and short lifespan.
Innovation Solution
A micro-valve system using a flexible plastic or polymeric sleeve connector with superimposed soft and hard layers, allowing for a short connection distance between fused-silica glass capillaries, which can be easily replaced and is cost-effective, featuring a uniformly pressing system for controlling fluid flow, either manually or electronically, to prevent clogging and ensure durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional miniaturized valves are used for capillary electrophoresis, then fluid flow control is achieved, but the valves clog when using buffers with high salt concentrations and are expensive to repair
Solution Approach 1:
The patent implements a disposable micro-valve system where the entire valve assembly including capillaries, connectors, and compression mechanism is designed as a single-use unit. After use, the entire assembly is discarded rather than repaired, eliminating repair costs and ensuring consistent performance without degradation from previous use. This resolves the contradiction by making the valve inexpensive enough to replace rather than repair.
Solution Approach 2:
The valve system is segmented into modular components (capillaries, connectors, compression elements) that can be independently manufactured and assembled. This segmentation allows for standardized, mass-producible parts that reduce individual component costs while maintaining overall system reliability through consistent manufacturing quality.
2Reliability
If conventional miniaturized valves are used, then fluid control is achieved, but they are prone to leakage and breakdown when handling organic solvents and high-pH buffers
Solution Approach 1:
The micro-valve system uses composite construction with chemically inert materials such as fused silica capillaries, PTFE (Teflon) connectors, and inert polymer components. This composite material selection provides resistance to organic solvents, high-pH buffers, and other harsh chemicals, ensuring reliable operation across diverse chemical environments without degradation or leakage.
Solution Approach 2:
The system creates a chemically inert environment by using materials that do not react with or absorb the fluids being handled. The PTFE and fused silica components provide a non-reactive pathway for fluid flow, preventing chemical interactions that would cause breakdown or contamination, thereby maintaining both reliability and chemical versatility.
3Reliability
If extensive washing is performed to clean the valves, then clogging is prevented, but the process time increases and results become irreproducible
Solution Approach 1:
By making the valve system disposable, the patent eliminates the need for extensive washing and cleaning procedures entirely. Each new valve assembly starts in a clean, clog-free state, ensuring reproducible results from the first use without requiring time-consuming cleaning protocols. This resolves the contradiction by removing the trade-off between cleaning time and clogging prevention.
Solution Approach 2:
The valve system is pre-manufactured in a clean, assembly-ready state with all components sealed and protected against contamination during manufacturing and storage. This preliminary preparation eliminates the need for post-use cleaning, as each new valve is ready for immediate use in a clog-free condition, saving time while maintaining reliability.
4Ease of operation
If a flexible plastic tube is used for connection, then the connection is easy to compress for valve control, but the connection distance between capillaries increases
Solution Approach 1:
The patent uses thin-walled flexible PTFE or polymer tubing for the valve connection section. This thin-film construction provides high flexibility and compressibility for easy manual or automated valve operation while maintaining a compact form factor. The thin walls allow efficient compression with minimal force and distance, reducing the overall connection length despite the flexibility requirement.
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 micro-valve system provides a robust, durable, and cost-effective solution for controlling fluid flow in capillary electrophoresis, preventing leakage and clogging, even with high salt and organic solvent use, ensuring reliable and repeatable results with extended lifespan and ease of integration and manufacturing.
Implementation Method 1
A uniform-pressure pressing system is applied over the external plastic tubes allowing for the complete blockage of the passage of fluid within the two small diameter capillaries
Implementation Method 2
two small diameter capillaries tightly connected within a short distance by a small and flexible plastic tube
Data Source
AI summary
Micro-valve system includes two or more superimposed tubes and a pressing device for fluid control in miniaturized capillary connections. The micro-valve system and method of fabrication can be tailored to the requirements of a wide range of applications; composition, sturdiness and thickness of plastic tubes; and capable of been adapted to the resilient of mechanical pressure and the passing and transport of fluid types.