Spring-Biased Capillary Fitting for Low-Dead-Volume Sealing
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Solution Overview
Problem
Existing fluidic connections in high-performance liquid chromatography (HPLC) systems face challenges in achieving both high sealing efficiency and low dead volume, especially under high pressure conditions, while also requiring easy and error-robust handling.
Innovation Solution
A fitting system is developed that includes a male and female piece with a capillary reception, where a sleeve covers part of the capillary, and an elastic biasing mechanism, such as a helical spring or magnetic elements, biases the capillary against the female piece, combined with a locking mechanism for secure attachment, allowing for automatic pre-load and adjustment, reducing manual handling needs and dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional ferrule-based sealing mechanism is used under high pressure, then sealing force is improved, but dead volume increases and handling becomes more complex
Solution Approach 1:
The fitting is divided into a male piece and a female piece with separate functional zones. The male piece contains the capillary reception and biasing mechanism, while the female piece contains the sealing surface. This segmentation allows each component to be optimized independently, reducing overall dead volume while maintaining sealing effectiveness under high pressure.
Solution Approach 2:
An elastic biasing mechanism acts as an intermediary between the capillary and the female piece. This mediator automatically applies and maintains the necessary sealing force on the capillary without requiring additional sealing components, thereby reducing dead volume while ensuring reliable sealing under high pressure conditions.
2Ease of operation
If manual adjustment and handling of capillary connections is required, then ease of operation is improved, but error robustness decreases and handling time increases
Solution Approach 1:
The elastic biasing mechanism is self-actuating and automatically adjusts the capillary position and sealing force without requiring manual intervention. The mechanism self-regulates to maintain optimal contact between the capillary and the female piece, eliminating user errors while simplifying handling to a simple insertion motion.
Solution Approach 2:
The elastic biasing mechanism provides continuous mechanical feedback through its elastic deformation, automatically compensating for variations in capillary position or dimensional tolerances. This feedback mechanism ensures consistent sealing performance without requiring precise manual adjustment, thereby improving both ease of operation and error robustness.
3Reliability
If multiple components and adjustment mechanisms are used, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing function and the biasing function are merged into a single integrated elastic biasing mechanism. This combined mechanism simultaneously provides both the sealing force and the positional adjustment, eliminating the need for separate sealing components and adjustment mechanisms, thereby reducing device complexity while maintaining sealing reliability.
Solution Approach 2:
The elastic biasing mechanism serves multiple functions: it applies sealing force, maintains capillary position, and compensates for dimensional variations. This multi-functional design replaces what would traditionally require multiple separate components, reducing overall device complexity while ensuring reliable sealing under high pressure.
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 provides a reliable, high-sealing-force, low-dead-volume connection suitable for high-pressure applications, simplifying handling and ensuring robust operation with haptic feedback for proper mounting, and allowing for easy assembly and disassembly without tools.
Implementation Method 1
an elastic biasing mechanism being arranged at least partially within the housing and being configured for biasing the capillary against the female piece
Implementation Method 2
U.S. Pat. No. 6,494,500 discloses a universal self-adjusting high pressure liquid connector... a biasing spring slidingly mounted on a capillary tube that extends through the connector
Data Source
AI summary
A fitting for providing a fluid connection between a capillary and a fluidic conduit of a fluidic component, the fitting comprising a male piece and a female piece for connection with the male piece, wherein the male piece comprises a housing with a capillary reception configured for receiving the capillary, wherein a part of the capillary being received in the capillary reception is circumferentially covered by a sleeve, an elastic biasing mechanism being arranged at least partially within the housing, being configured for biasing the capillary against the female piece and being supported by the sleeve, and a locking mechanism being arranged at least partially within the housing and being configured for locking the capillary to the fitting.