Biocompatible Fluidic Fitting Assembly for Low-Torque Sealing
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Solution Overview
Problem
Conventional fluidic connections in analytical instrument systems, such as liquid chromatography, often require high installation forces and tools due to the torque needed for effective sealing, which can lead to errors, increased assembly time, and potential damage to components. Additionally, stainless-steel components can interact with biological samples, causing inaccurate results and contamination risks.
Innovation Solution
A biocompatible fluidic connection system featuring a threaded fastener and a fitting assembly with a ferrule and locking ring, made from materials like PEEK, that allows for manual assembly with minimal torque (less than 2 inch-pounds) and tool-free operation, ensuring leak-free connections and compatibility with biological samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluidic connections use high installation forces and tools for effective sealing, then sealing reliability is improved, but assembly time increases and components may be damaged
Solution Approach 1:
The fitting assembly is divided into distinct components: a fitting body with external threads, a ferrule, and a locking ring. This segmentation allows each component to perform its specific function independently, enabling tool-free assembly while maintaining sealing reliability through the coordinated action of these segmented parts
Solution Approach 2:
The ferrule is pre-installed onto the tubing before connection, and the fitting body is designed with pre-formed external threads. This preliminary preparation eliminates the need for tools during final assembly, as components are designed to connect directly through manual screwing while maintaining effective sealing
2Reliability
If conventional fluidic connections use high installation forces for effective sealing, then sealing reliability is improved, but the risk of component damage increases
Solution Approach 1:
The locking ring is designed to deform elastically under manual tightening torque, creating a dynamic sealing mechanism. As the locking ring deforms, it exerts radial force on the ferrule to create a seal without requiring high installation forces that could damage components
Solution Approach 2:
The sealing mechanism transitions from high-force rigid sealing to low-force elastic sealing. The locking ring's elastic deformation changes the sealing parameter from high contact force to distributed elastic pressure, maintaining seal integrity while protecting components from damage
3Strength
If stainless-steel components are used in fluidic connections, then mechanical strength is improved, but biocompatibility deteriorates due to interactions with biological samples
Solution Approach 1:
The fitting assembly uses composite material construction: the fitting body is made from strong materials like PEEK or reinforced PEEK providing mechanical strength, while the ferrule and locking ring are made from biocompatible materials like PEEK or elastomers. This composite approach combines mechanical strength with biocompatibility to prevent sample contamination
Solution Approach 2:
Different parts of the fitting assembly have different material properties optimized for their specific functions. The fitting body uses high-strength materials for structural support, while the sealing surfaces (ferrule and locking ring) use biocompatible materials that do not interact with biological samples, creating local quality differentiation
4Ease of operation
If manual assembly with minimal torque is used, then ease of operation is improved, but sealing reliability may deteriorate
Solution Approach 1:
The locking ring is designed to automatically generate the necessary sealing force through its own elastic deformation when manually tightened. The system is self-regulating, where the act of manual assembly itself activates the sealing mechanism without requiring external tools or excessive force
Solution Approach 2:
The sealing mechanism uses elastic deformation parameter changes in the locking ring to convert minimal manual torque into sufficient sealing pressure. As the locking ring deforms elastically during manual assembly, it generates the radial force needed for sealing, maintaining reliability while improving ease of operation
Data Source
AI summary
A fluidic connection system includes a threaded fastener and a fitting assembly. The threaded fastener may be a universal threaded fastener that may be used with various tubings having different outer diameters. The fitting assembly includes a locking ring and a ferrule sized and shaped to fit within a borehole of the locking ring. When the fluidic connection system is assembled an end of the locking ring and an end of the ferrule project beyond an end of the fitting assembly. In some embodiments, the locking ring may be symmetric about a plane normal to its longitudinal axis such that the locking ring may be positioned on the tubing in either direction. The locking ring may be received in a fitting pocket of the fitting assembly. In other embodiments, the locking ring has a tapered feature on an end that engages with a tapered feature on the threaded fastener for aiding in centering the locking ring within the threaded fastener. In some embodiments, the ferrule may also be symmetric about a longitudinal axis such that the ferrule may be positioned on the tubing in either direction.