Syringe Conduit Fitting Dead Space Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing syringe/conduit combinations with frustoconical slip fittings according to the ISO Luer Standard suffer from significant dead space, leading to medicament waste and potential health hazards, as they have a large 'dead space' between the male and female fittings, which is not efficiently minimized while maintaining resistance against dislodgement.
Innovation Solution
The syringe/conduit combination reduces the distance between the distal end of the male fitting and the inner end of the female fitting to less than 0.1 mm, using abutments to limit axial displacement and ensure a tight press fit, while conforming to ISO Luer Standard requirements for resistance against dislodgement, thereby minimizing dead space without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the distance between male and female fittings is reduced to minimize dead space, then medicament waste is reduced, but resistance against dislodgement may be compromised
Solution Approach 1:
The patent modifies the geometric parameters of the frustoconical fittings, specifically reducing the distance between the male and female fittings to less than 0.1 mm, thereby minimizing dead space and medicament waste while maintaining connection reliability through optimized dimensional parameters
Solution Approach 2:
The patent employs frustoconical (curved) surfaces for the male and female fittings instead of flat surfaces, creating a tapered geometry that provides both sealing and mechanical interlocking to prevent dislodgement while minimizing the gap between fittings
2Reliability
If additional components are added to ensure tight press fit and prevent dislodgement, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions (sealing, mechanical interlocking, and positioning) into the frustoconical fitting structure itself, eliminating the need for additional separate components while ensuring both tight press fit and resistance against dislodgement
Solution Approach 2:
The frustoconical fitting design performs multiple functions simultaneously: it provides sealing through conical surface contact, mechanical strength through the tapered geometry, and positioning through the standardized ISO Luer dimensions, making the connection both reliable and simple
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
This design significantly reduces the dead space between the fittings, ensuring compliance with ISO Luer Standard resistance requirements, minimizing medicament waste, and enhancing safety by preventing inadvertent dislodgement while allowing for efficient fluid transfer.
Implementation Method 1
In slip fitting connections this resistance and sealing is supplied by the friction between the opposing conical surfaces
Data Source
AI summary
Syringe/conduit combination with a syringe part (1) and a conduit part (2). The parts have a male slip fitting (4) and a female slip fitting (5) for press fitted connection. The syringe part (1) has a hollow barrel (22) and a plunger (23) inserted into the barrel (22). The plunger (23) and the hollow barrel (22) have abutments (25, 27) defining a maximally inserted position of the plunger (23). The male slip fitting (4) fits in the female slip fitting (5) such that the male slip fitting (4) is at an axial distance of less than 0.1 mm from an internal end of the female slip fitting (5). The plunger (23) in its maximally inserted position is then at an axial distance from an opposite one of the slip fittings (5) that is equal to or less than the axial distance between the male slip fitting (4) and the internal end (9) of the female slip fitting (5).