Single-Use Cap Mechanism That Blocks Rethreading After Sealing
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Solution Overview
Problem
Conventional caps for medical and sterile receptacles allow for rethreading, risking contamination, and are often overly simplified to reduce manufacturing costs, compromising security against reuse.
Innovation Solution
A single use cap design featuring a threaded component that moves from an 'unused' to a 'used' position upon tightening, preventing reattachment by making the threads inaccessible after initial use, utilizing movable components within a cap body to secure the cap to a receptacle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional cap designs are overly simplified to reduce manufacturing costs, then manufacturing cost decreases, but security against reuse and contamination prevention deteriorates
Solution Approach 1:
The threaded component is designed to move dynamically from a first position (where threads are accessible) to a second position (where threads are inaccessible) after the cap is tightened onto the receptacle. This dynamic repositioning prevents reuse while maintaining a relatively simple cap structure that can be manufactured cost-effectively.
Solution Approach 2:
The cap is divided into distinct components: a cap body, a threaded component, and a seal member. This segmentation allows each component to perform its specific function independently, enabling cost-effective manufacturing while achieving the reliability goal through the coordinated action of these segments, particularly the movable threaded component.
2Device complexity
If a cap allows rethreading to reduce complexity, then device complexity decreases, but contamination risk increases
Solution Approach 1:
The threaded component automatically transitions from an accessible state to an inaccessible state after initial use. This dynamic behavior ensures that even though the cap structure remains relatively simple, it inherently prevents contamination by making rethreading physically impossible after the first use.
3Reliability
If a threaded component is made movable to prevent reuse, then contamination prevention improves, but device complexity increases
Solution Approach 1:
The threaded component is designed to move from a first position to a second position in response to the tightening action. This dynamic mechanism provides robust contamination prevention while maintaining relative structural simplicity through the use of a frangible member and straightforward positioning features.
Solution Approach 2:
The threaded component is pre-positioned in a first position that allows initial threading. The frangible member is pre-configured to break or disengage during the tightening process, automatically triggering the transition to the second position where reuse is prevented. This preliminary configuration enables the anti-reuse function without requiring complex control mechanisms.
Data Source
AI summary
The disclosed principles provide for single use caps that may be applied to any of a number of receptacles, containers, vessels, needless connectors, or other device. A single use cap as disclosed herein includes a component that, when the cap is threaded onto a receptacle or device, is moved from an “unused” to a “used” position by the twisting force applied to the cap when secured onto the receptacle or device. Specifically, once the threads of the receptacle or device are received into the cap and a twisting or tightening force is continued to be applied to the cap, the continued twisting force causes this component to rotate laterally so that once the cap is removed from the receptacle or device, the threads of the cap are no longer reachable by the threads on the receptacle or device.