Disinfectant Cap Threaded Coupling Mechanism
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Solution Overview
Problem
Existing disinfectant caps for needleless connectors (LADs) face premature disengagement due to variance in thread dimensions across manufacturers, leading to accidental disconnection during use.
Innovation Solution
The design incorporates a cap with a coupling mechanism featuring a thread that spirals into an interior cavity and includes retention lugs of varying volumes to accommodate thread variance, providing localized pressure points for secure engagement and minimizing premature disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional threaded cap is used for LADs, then the cap can be manufactured simply, but the cap disengages prematurely due to thread dimension variance across manufacturers
Solution Approach 1:
The cap incorporates retention lugs at specific locations on the threaded coupling mechanism that engage with corresponding portions of the LAD threads. These lugs provide localized pressure points that accommodate thread dimension variance by distributing engagement forces across multiple contact points rather than relying on uniform thread engagement throughout the entire threaded interface.
Solution Approach 2:
The threaded coupling mechanism is designed with parameters (thread pitch, diameter, engagement depth) that are optimized to accommodate the range of thread variations found across different LAD manufacturers. By adjusting these parameters within acceptable tolerances, the cap achieves reliable retention across diverse LAD specifications without requiring custom design for each manufacturer.
2Reliability
If retention lugs are added to the threaded coupling mechanism, then cap retention is improved, but the manufacturing complexity increases
Solution Approach 1:
The threaded coupling mechanism is segmented into functional zones: the threaded portion for engagement and the retention lugs for securement. This segmentation allows each element to perform its specific function independently, with the lugs providing localized retention forces without requiring complex overall redesign of the coupling mechanism.
Solution Approach 2:
The cap is constructed as a composite structure integrating the threaded coupling mechanism and retention lugs into a single molded unit. This composite approach combines multiple functions (threaded engagement and lug-based retention) into one component, reducing assembly steps and manufacturing complexity compared to separate parts that would need to be assembled.
Data Source
AI summary
A cleaning device for LADs, and other such threaded devices, comprising a cap and a cleaning agent. The cap comprises a casing having an opening to an interior cavity. A threaded coupling mechanism is located on the inner surface of the casing proximate the opening. The coupling mechanism has retention features that provide localized pressure points on the threads of the LAD to accommodate thread variance and reduce the chance of premature disengagement.