Planar Fluid Conduit Coupler for HPLC Dead Volume Reduction
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Solution Overview
Problem
In high performance liquid chromatography (HPLC), existing coupling methods for planar fluid conduits to fluidic devices often result in dead volume and cross-contamination, particularly when using standard fitting interfaces designed for circular conduits, which can lead to poor separation and identification of compounds due to increased pressure and flow rate variations.
Innovation Solution
A fitting coupler with a contact pressure element and guidance system that securely seals and aligns planar fluid conduits with fluidic devices, reducing dead volume and preventing rotation-induced leaks, while accommodating high pressures and thermal variations through adjustable axial force elements and thread mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard fitting interfaces designed for circular conduits are used to couple planar fluid conduits to fluidic devices, then the coupling can be achieved with existing components, but dead volume increases and cross-contamination occurs
Solution Approach 1:
A specialized coupler acts as an intermediary component between the planar fluid conduit and the standard fitting interface. The coupler includes a planar sealing surface that mates with the planar conduit and a circular sealing surface that interfaces with the standard fitting, effectively mediating between two different connection geometries and eliminating dead volume
Solution Approach 2:
The coupling system is divided into distinct functional segments: a planar sealing portion for the planar conduit, a circular sealing portion for the standard fitting, and intermediate structural elements. This segmentation allows each part to be optimized for its specific function while working together as a complete coupling solution
2Adaptability or versatility
If standard fitting interfaces designed for circular conduits are used to couple planar fluid conduits to fluidic devices, then existing components can be utilized, but cross-contamination occurs
Solution Approach 1:
The specialized coupler serves as a contamination barrier by providing dedicated sealing surfaces that prevent fluid leakage and cross-contamination. The planar sealing surface creates a precise seal with the planar conduit, while the circular sealing surface interfaces with the standard fitting, eliminating pathways for contamination
Solution Approach 2:
The design converts the potential harm of mismatched interfaces into a benefit by using the geometry mismatch to create a specialized sealing arrangement that actually improves sealing performance and prevents contamination compared to forcing a poor fit
3Quantity of substance
If planar fluid conduits are coupled to fluidic devices, then low-volume flow applications can be enabled, but reliable sealing under high pressure requires adjustable axial force elements
Solution Approach 1:
The coupling system incorporates adjustable axial force elements that can dynamically adapt to pressure variations and thermal expansions. The adjustable mechanism allows the sealing force to be optimized for different operating conditions, maintaining reliable sealing from low-pressure Nano-LC to high-pressure applications
Solution Approach 2:
The axial force elements allow adjustment of sealing parameters such as contact pressure and positioning force. This parameter adjustment capability enables the same coupling design to maintain reliable sealing across different pressure ranges and temperature conditions, accommodating both low-volume flow requirements and high-pressure reliability
4Manufacturing precision
If planar fluid conduits are coupled using specialized couplers, then dead volume is reduced and separation efficiency improves, but the device complexity increases
Solution Approach 1:
The specialized coupler is designed to be universally compatible with standard fitting interfaces while providing optimized planar sealing. This multi-functionality allows a single coupler design to handle both the adaptation to standard fittings and the optimization for low dead volume, reducing the need for multiple different coupling components
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
This solution enables reliable, low-dead-volume coupling of planar fluid conduits to HPLC devices, improving separation efficiency and reducing contamination, especially in low-volume flow applications like Nano-LC coupled to MS, by ensuring secure, pressure-resistant connections.
Implementation Method 1
a contact pressure element, which is configured for sealingly pressing a conduit opening of the planar fluid conduit to the mouth
Data Source
AI summary
A fitting coupler is provided configured for coupling a planar fluid conduit and a fluidic device. The fluidic device comprises a cavity, a device conduit, and a mouth where the device conduit opens into the cavity. A contact pressure element is configured for sealingly pressing the planar fluid conduit to the mouth, so that a conduit opening of the planar fluid conduit opens into the mouth.