Luer Lock Connector Cap Anti-Rotation Keyway
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Solution Overview
Problem
Existing luer lock connectors are time-consuming to connect, especially in suboptimal environments, and there is a risk of inadvertently rotating non-standard female connectors, leading to potential incorrect fluid connections.
Innovation Solution
A cap with a keyway and stopper design that prevents rotation of non-standard female luer lock fittings, featuring a sloped surface and tactile indicators to guide and align the fittings correctly, ensuring secure and efficient connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-standard female luer lock connector is used to prevent incorrect connections, then connection safety is improved, but connection time increases and alignment becomes difficult
Solution Approach 1:
The cap is pre-assembled on the male connector with the keyway and alignment features already in place. This preliminary preparation allows the female connector to be quickly guided into the correct position without time-consuming manual alignment, resolving the contradiction between safety (through unique keyway matching) and speed (through pre-positioned alignment features).
Solution Approach 2:
The cap acts as an intermediary component between the male and female connectors. It provides the keyway that mechanically guides the female connector's lugs into correct alignment, ensuring safety while reducing alignment time. The intermediary structure translates the safety requirement into a time-efficient mechanical guidance system.
2Reliability
If a non-standard female luer lock connector is used, then connection safety is improved, but ease of operation deteriorates due to alignment difficulty
Solution Approach 1:
The keyway is designed with an asymmetric shape that does not match standard luer connectors. This asymmetric geometry provides tactile and visual cues that guide the operator into the correct alignment position, making the operation easier while maintaining the safety benefit of non-standard configuration. The asymmetric shape acts as a mechanical guide that naturally directs proper insertion.
Solution Approach 2:
The alignment feature may include visual indicators (such as colored markings or contrasting surfaces) that change or become apparent during the connection process. These visual cues help operators quickly identify the correct alignment position, improving ease of operation while maintaining the safety benefits of the non-standard connector design.
3Reliability
If a non-standard female luer lock connector is used, then connection safety is improved, but the risk of inadvertent rotation increases
Solution Approach 1:
The cap's keyway and the female connector's lugs are designed with preliminary anti-rotation features that prevent inadvertent rotation before proper engagement. The geometric constraint of the keyway physically blocks rotation until the connector is correctly positioned and locked, countering the harmful effect of inadvertent rotation in advance.
Solution Approach 2:
The potential harm of rotation is converted into a benefit by designing the keyway geometry such that any rotational movement actually guides the connector toward the correct engagement position. The rotational constraint becomes a positive alignment mechanism rather than a source of error, transforming the potential harmful factor into an alignment aid.
Data Source
AI summary
A cap for a fluid line connector having a male luer lock fitting, the cap having a first side and a second side opposite the first side, the cap comprising a barrier and a stopper extending axially from the barrier towards the first side of the cap. The barrier defines a keyway centred on a longitudinal axis. The shape of the keyway is configured to permit a correspondingly-shaped female luer lock fitting to pass axially therethrough to engage the male luer lock fitting of the fluid line connector. The stopper is configured to prevent rotation of the correspondingly-shaped female luer lock fitting in the first circumferential direction when a lug of the correspondingly-shaped female luer lock fitting is circumferentially aligned with the stopper.