UHPLC Connection Assembly Using Biocompatible PEEK Ferrule
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Solution Overview
Problem
Conventional connections in liquid chromatography systems, particularly in high and ultra-high pressure applications, are inefficient due to the need for time-consuming disconnections and reconnections, risk of leakage, and potential contamination from stainless steel components, which are not biocompatible with biological samples.
Innovation Solution
A fitting assembly comprising a nut, double-headed ferrule, and fitting with tapered ends and threaded portions, made from biocompatible materials like PEEK, that allows for quick and leak-proof connections and disconnections without the need for tools, minimizing the risk of contamination and deformation of tubing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional stainless steel connections are used in HPLC systems, then connection strength and pressure resistance are improved, but contamination risk to biological samples increases due to lack of biocompatibility
Solution Approach 1:
The connection assembly uses a composite structure combining PEEK (polyether ether ketone) and stainless steel components. The PEEK portions that contact biological samples provide biocompatibility and prevent contamination, while the stainless steel portions provide structural strength and pressure resistance. This composite material approach resolves the contradiction by assigning different material properties to different functional regions of the same component.
2Reliability
If conventional threaded fittings are used for connecting LC components, then connection reliability under pressure is improved, but connection time and operational efficiency deteriorate due to time-consuming assembly and disassembly
Solution Approach 1:
The connection assembly is segmented into modular components (PEEK fitting, ferrule, and connector portions) that can be quickly assembled and disassembled. The tapered ferrule design allows for rapid insertion and secure locking without requiring complex threading operations, while maintaining reliable pressure-containing connections. This segmentation enables quick replacement of columns and other LC components.
Solution Approach 2:
The ferrule is pre-formed with a tapered geometry that automatically aligns and secures the tubing during insertion. The PEEK fitting includes pre-configured internal features that guide and lock the ferrule in place, eliminating the need for post-assembly adjustments or tightening operations. This preliminary preparation of geometric features speeds up the connection process while ensuring reliable connections.
3Stress or pressure
If conventional connections are used in UHPLC systems, then pressure containment is achieved, but leakage risk increases due to deformation of tubing under ultra-high pressure
Solution Approach 1:
The PEEK fitting incorporates a flexible, elastomeric seal ring that conformally contacts the tubing and maintains sealing pressure under ultra-high conditions. This flexible membrane-like seal accommodates tubing deformation and dimensional variations, preventing leakage even when tubing expands or distorts under UHPLC operating pressures of 15,000 psi or higher.
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 rapid and reliable connections and disconnections in UHPLC systems, reducing inefficiencies and the risk of leakage, while maintaining biocompatibility and preserving the integrity of fluid flow under high pressures.
Implementation Method 1
The first end of the ferrule has an externally tapered portion adapted to be compressed against a tapered inner surface of the nut when the nut and fitting are engaged, thereby providing a leak proof seal
Data Source
AI summary
A fitting assembly having a single- or double-headed ferrule, a nut, and a fitting that may be assembled or dissembled by an operator. The fitting assembly includes a nut with first and second ends, with the second end adapted to receive or abut the first end of a ferrule, and further includes a fitting with a first end having an internally tapered portion adapted to receive the second end of the ferrule and a second end adapted to be removably connected to a component or fitting of a liquid chromatography system. The nut, ferrule and fitting of the fitting assembly have passageways therethrough for receiving and removably holding tubing.