Syringe Cap Locking Mechanism for Seal Safety
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Solution Overview
Problem
Conventional syringes with anti-releasing-type open-and-shut cap structures lack a locking mechanism, leading to poor seal safety, leakage of medical fluids, contamination, and potential breakage of the needle neck due to weak coupling and external forces.
Innovation Solution
Incorporating a locking groove and locking protrusion on the open-and-shut cap and luer-lock, respectively, with a tension locker providing inward and outward tension, and integrating the luer-lock with the syringe body via heat welding or fusing to enhance coupling strength and prevent natural release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the open-and-shut cap is fastened to the luer-lock using a threaded fastening method without a locking mechanism, then the device complexity is reduced, but the reliability of the seal is poor because the threaded fastening structure can be easily released under external force, shock, or shaking
Solution Approach 1:
The fastening structure is divided into functional segments: the threaded fastening portion for initial attachment and the separate locking groove/protrusion mechanism for securing. This segmentation allows each part to perform its specific function - the threads provide easy attachment while the locking features prevent release, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The locking groove and protrusion are pre-configured in specific positions on the open-and-shut cap and luer-lock respectively. When the cap is threaded onto the luer-lock, the locking protrusion automatically engages with the locking groove before any release can occur. This preliminary positioning ensures that the seal is secured against external forces before they can act on the connection.
2Ease of manufacture
If the luer-lock is separately assembled with the sleeve instead of being integrally coupled, then the ease of manufacture is improved, but the strength of the connection is reduced leading to potential breakage of the needle neck due to external forces
Solution Approach 1:
The luer-lock is integrally coupled with the upper portion of the syringe body through heat welding or fusing, merging two previously separate components into a single unified structure. This integration eliminates the weak interface between separate parts, providing sufficient strength to withstand external forces during use while maintaining manufacturability through one-step molding or post-molding integration processes.
3Ease of manufacture
If the luer-lock is separately assembled with the sleeve, then the ease of manufacture is improved, but the reliability of the seal is poor because injection fluid can contaminate the syringe body through gaps between components
Solution Approach 1:
By integrally coupling the luer-lock with the syringe body through heat welding or fusing, the invention eliminates gaps and interfaces between separate components. This merged structure prevents injection fluid from leaking through gaps and contaminating the syringe body, while the integral construction can be achieved through one-step molding or post-molding integration processes that maintain manufacturing efficiency.
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
Ensures excellent seal safety, prevents leakage and contamination, and strengthens the syringe structure to avoid needle neck breakage, maintaining a secure and sealed state during use.
Implementation Method 1
a tension locker having a locking protrusion to be inserted into the locking groove of the open-and-shut cap is formed on the fastening hole of the luer-lock in such a way as to provide tension inwards and outwards
Implementation Method 2
integrating the luer-lock with the syringe body via heat welding or fusing to enhance coupling strength
Data Source
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AI summary
Disclosed herein is an integrated syringe, in which an open-and-shut cap is fastened to a lure-lock coupled to a sleeve on an upper portion of a syringe body. When the open-and-shut cap is fastened to the luer-lock in a threaded fastening method, a locking groove and a locking protrusion of a tension locker correspondingly formed on the open-and-shut cap and the luer-lock perform a locking function, so that a natural release of the open-and-shut cap is prevented, thus reliably guaranteeing seal safety, preventing the leakage of injection fluid and a loss of the injection fluid and preventing the penetration of germs. Further, the luer-lock is integrally coupled to an end of the syringe body, thus preventing the syringe body and its surrounding from being contaminated by injection fluid, and preventing a neck portion of the syringe body from being broken, thus achieving both convenience and safety in use.