Self-Righting Tip Cap for ENFit Syringe Sealing
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Solution Overview
Problem
The universal design of Luer connectors in medical devices often leads to misconnections between different fluid delivery systems, resulting in patient injuries and deaths, and existing self-righting caps are not compatible with the ENFit connector standards.
Innovation Solution
A self-righting tip cap with a bulbous, oblate spheroid geometry and an irregular surface that tends to right itself when dropped, featuring a coupling element and clips for secure engagement with ENFit or ISO 80369-compatible connectors, ensuring correct orientation and preventing misconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If universal Luer connectors are used for ease of connection, then ease of operation is improved, but misconnections between different fluid delivery systems occur causing patient harm
Solution Approach 1:
The ENFit connector employs asymmetric geometry where the male connector has a specific shape that can only engage with the corresponding female connector in one orientation. This asymmetric design physically prevents misconnections between incompatible fluid delivery systems while maintaining ease of connection through the simple snap-fit mechanism.
Solution Approach 2:
The connector design incorporates specific local geometric features at the connection interface, including the shape of the male connector body, the positioning of the locking mechanism, and the configuration of the female receiver. These localized geometric qualities ensure compatibility only between intended mating connectors, preventing wrong-route connections.
2Productivity
If small self-righting caps are used for sealing syringes, then productivity is improved by quick sealing, but compatibility with ENFit connector standards is lost
Solution Approach 1:
The cap incorporates an asymmetric oblate spheroid geometry with an irregular surface that causes it to self-right to a specific orientation when placed on a surface. This asymmetric shape is specifically designed to be compatible with the ENFit connector geometry, allowing the cap to only seal syringes with ENFit connectors and not LUER connectors, thereby ensuring compatibility while maintaining quick sealing through the self-righting feature.
Solution Approach 2:
The cap's irregular surface geometry enables it to automatically orient itself in the correct position when placed on a flat surface, eliminating the need for manual orientation by the user. This self-righting capability allows for rapid sealing of syringes while ensuring the cap is always in the correct orientation for ENFit connector compatibility.
3Ease of operation
If self-righting cap geometry is designed for automatic orientation, then ease of operation is improved, but compatibility with standard connectors may be compromised
Solution Approach 1:
The cap employs asymmetric oblate spheroid geometry with specific irregular surface features that enable automatic orientation through self-righting. The asymmetric shape is specifically engineered to match the ENFit connector geometry, ensuring that when the cap self-rights, it presents the correct interface for engagement with ENFit connectors, thus maintaining both automatic orientation and connector compatibility.
Solution Approach 2:
The cap's geometric parameters, including its oblate spheroid shape and surface irregularities, are specifically optimized to achieve both self-righting behavior and ENFit connector compatibility. By carefully controlling the cap's dimensions, curvature, and surface features, the design achieves automatic orientation while ensuring precise geometric matching with ENFit connectors.
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
The self-righting tip cap ensures quick and correct sealing of syringes, reducing the risk of misconnections and enhancing safety by automatically orienting itself for easy coupling, thus addressing the compatibility issues with ENFit standards.
Implementation Method 1
a self-righting tip cap with a bulbous, oblate spheroid geometry and an irregular surface that tends to right itself when dropped
Data Source
AI summary
A self-righting tip cap includes a cap body having a generally oblate spheroid external shell geometry defining a first end and a second end. The first end has a base surface, and at least one clip extends from the body towards the second end. A coupling element accessible from the second end provides removable attachment of the tip cap to a cooperating coupling of a syringe or other female ENFit connectors. The geometry of the tip cap causes it to tend toward uprighting itself when dropped onto a flat surface, such that the base surface is in contact with the flat surface and the coupling element is accessible in an upward facing orientation. According to example forms, at least one rib of a female coupling can become interengaged with at least a portion of the clips such that the self-righting tip cap can be pulled and/or rotationally moved relative to the female coupling to be removed therefrom.