Self-righting tip cap with oblate spheroid geometry
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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, as they allow easy connection of tubes intended for different functions, and existing self-righting caps are not compatible with ENFit connector standards.
Innovation Solution
A self-righting tip cap with a generally oblate spheroid external geometry and a coupling element that includes a resilient clip and annular recess, designed for removable 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 LUER connectors are designed for universal compatibility, then ease of operation is improved, but reliability deteriorates due to misconnections between different fluid delivery systems
Solution Approach 1:
The ENFit connector employs asymmetric geometry where the male connector has a specific shape that only fits into the corresponding female connector of the same system. This prevents misconnections between different fluid delivery systems (e.g., enteral, vascular, respiratory) by making incompatible connectors physically non-matching, thus resolving the contradiction between ease of connection and connection safety.
2Ease of manufacture
If self-righting caps are designed with simple geometry, then ease of manufacture is improved, but adaptability deteriorates due to incompatibility with ENFit connector standards
Solution Approach 1:
The cap is designed with differentiated local qualities: the majority of the cap body maintains simple geometry for ease of manufacture, while the coupling feature at the distal end incorporates specific ENFit-compatible geometry. This allows the cap to be manufactured efficiently while adapting to ENFit connector standards, resolving the contradiction between manufacturing simplicity and connector compatibility.
3Device complexity
If caps are designed without self-righting features, then device complexity is reduced, but ease of operation deteriorates due to difficulty in correct orientation during capping
Solution Approach 1:
The cap body is given a spheroidal or rounded geometry with a center of gravity positioned such that when the cap is dropped or placed on a surface, it naturally rights itself to the correct orientation. This self-righting feature, achieved through curved surfaces and gravitational forces, improves capping speed and correctness without significantly increasing device complexity, as the same rounded geometry serves both aesthetic and functional purposes.
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 by automatically orienting to the correct position, reducing the risk of misconnections and enhancing safety in medical fluid delivery systems.
Implementation Method 1
a self-righting tip cap including a cap body having a generally oblate spheroid external geometry... ensures quick and correct sealing of syringes by automatically orienting to the correct position
Data Source
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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.