Prefilled Syringe Cap with Lock Adapter and Breaking Section
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Solution Overview
Problem
Prefilled syringes face issues with tamperproofness and undesirable breakage of the breaking section due to external forces during transport, as the existing designs lack sufficient protection against stress that exceeds the breaking limit.
Innovation Solution
A syringe design featuring a reduced diameter section with a ring-shaped lock adapter and a cap with a ring portion that is loosely fitted between the reduced diameter section and the lock adapter, preventing recapping and distributing external forces to prevent breakage, ensuring the syringe remains unsealed and tamperproof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the breaking section is made fragile to prevent recapping, then tamperproofness is improved, but the breaking section becomes vulnerable to undesirable breakage from external forces during transport
Solution Approach 1:
The cap is divided into three distinct sections: cap main body, mounting section, and breaking section. The breaking section is specifically designed as a separate link that connects the cap main body to the mounting section, allowing it to break independently under rotational force while maintaining the structural integrity of other components during transport.
Solution Approach 2:
Different parts of the cap have different mechanical properties tailored to their specific functions. The breaking section has lower strength and is designed to break easily, while the cap main body and mounting section maintain sufficient strength to withstand transport forces. The ring portion of the cap main body is configured to contact the lock adapter, providing localized support that prevents excessive stress on the breaking section during handling.
2Stability of the object's composition
If the cap main body is made secure to the mounting section, then structural integrity is improved, but recapping becomes possible which compromises tamperproofness
Solution Approach 1:
The breaking section is pre-configured as a sacrificial element that is designed to break under specific conditions (rotational force during unsealing). This preliminary design ensures that once the cap is opened, the breaking section is destroyed, making recapping impossible and providing clear evidence of opening.
Solution Approach 2:
The breaking section functions as a disposable, single-use component. It is designed to be consumed during the first unsealing operation, ensuring that the cap cannot be reused. This aligns with the principle of using disposable elements to prevent reuse and maintain tamperproofness.
3Stability of the object's composition
If the ring portion is tightly fitted to prevent movement, then stability is improved, but stress concentrates on the breaking section causing undesirable breakage
Solution Approach 1:
The ring portion of the cap main body acts as an intermediary element that contacts the lock adapter. This contact provides a stabilizing function by preventing excessive movement of the cap main body during transport, while the loose fit ensures that stress is not concentrated on the breaking section. The lock adapter serves as the intermediary structure that receives the ring portion's contact force.
Solution Approach 2:
The ring portion is configured with a loose fit rather than a tight fit, providing partial stabilization without excessive constraint. This partial action is sufficient to prevent unwanted movement during transport while avoiding the concentration of stress that would lead to breaking section failure.
Data Source
AI summary
A syringe includes a syringe outer tube including a tubular-shaped outer tube main body configured to be filled with a liquid, a reduced diameter section located at a distal end of the outer tube main body in a projecting manner, and configured to allow the liquid to pass therethrough, the reduced diameter section having an outside diameter that is smaller than a diameter of the outer tube main body, and a ring-shaped lock adapter concentrically disposed at an outer circumferential portion of the reduced diameter section and configured to fix a mating member connected to the reduced diameter section; and a cap including a cap main body mounted on the syringe outer tube and configured to seal the reduced diameter section in a liquid-tight manner when the cap main body is in a mounted state, a ring-shaped mounting section disposed at a proximal end side of the cap main body and mounted on an outer circumferential portion of the lock adapter, and a breaking section that forms a link between the cap main body and the mounting section and that is configured to release the link by breakage.