Chromatography Cap Assembly With Interchangeable Friction-Fit Liner
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Solution Overview
Problem
Existing methods for securing liners in chromatography caps are costly, chemically limited, or mechanically weak, and lack easy interchangeability.
Innovation Solution
A cap assembly with an outer and inner cap design, where the inner cap is friction-fitted within the outer cap, using knurled surfaces, to securely hold a liner that includes a septum and polymer layers, allowing for easy interchangeability and robust bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical bonding methods are used to secure liners to caps, then bonding strength is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces chemical bonding methods with a mechanical interference fit system. The inner cap features an outer diameter that interferes with the inner cap cavity, creating a secure mechanical connection without chemicals. This substitution eliminates complex chemical processes while maintaining or improving bonding strength through pure mechanical means.
Solution Approach 2:
The cap assembly is divided into distinct segments: outer cap, inner cap with knurled surface, and liner. This segmentation allows each component to be manufactured independently using simple processes, then assembled through the interference fit mechanism. The modular design reduces overall manufacturing complexity while achieving strong bonding through the mechanical connection between segments.
2Strength
If chemical bonding methods are used to secure liners to caps, then bonding strength is improved, but cost increases
Solution Approach 1:
The patent eliminates expensive chemical bonding agents and processes by using a purely mechanical interference fit system. The cost of chemicals, along with the complexity of chemical application and curing processes, is replaced by a simple dimensional design where the inner cap's outer diameter slightly exceeds the cap cavity's inner diameter, creating a secure fit through geometry alone.
Solution Approach 2:
The design employs simple, inexpensive plastic components that can be manufactured through common molding processes. The inner cap and outer cap are designed as disposable or reusable plastic parts that achieve their bonding function through geometry rather than expensive materials or complex assembly processes, significantly reducing manufacturing cost.
3Ease of operation
If crimping or snapping mechanisms are used to secure liners, then ease of application is improved, but bonding strength decreases
Solution Approach 1:
The interference fit design is self-securing during the normal capping process. As the inner cap is inserted into the outer cap, the dimensional interference automatically creates the bonding force without requiring separate crimping or snapping operations. The system serves itself to achieve both ease of application and strong bonding through the same simple insertion action.
4Device complexity
If a fixed cap design is used, then manufacturing simplicity is improved, but interchangeability decreases
Solution Approach 1:
The cap assembly is segmented into interchangeable components: outer cap, inner cap, and liner. The inner cap with its knurled surface and specific dimensional profile can be exchanged between different outer caps or vials. This segmentation maintains design simplicity for each individual component while enabling interchangeability at the system level, allowing the same inner cap design to be used across multiple applications.
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
Provides a strong, economical, and interchangeable mechanism for securing liners in caps, suitable for chromatography, water analysis, and biological testing, ensuring effective sample containment and extraction.
Implementation Method 1
an outer surface of the inner cap is configured to engage an inner surface of the outer cap to secure the inner cap at least partially within the outer cap
Implementation Method 2
the inner cap is friction fit at least partially within the outer cap
Data Source
AI summary
The present disclosure provides for a cap assembly for use with a vial, the cap assembly comprising: an outer cap defining a central cavity, an upper opening, and a lower opening; an inner cap defining a central cavity, wherein the inner cap is secured at least partially within the outer cap's central cavity; and a liner disposed within the outer cap's central cavity between the outer cap's upper opening and an upper edge of the inner cap, wherein the liner extends across the outer cap's upper opening. Further provided herein are methods of using the same.