Tamper-Evident Syringe Cap With Two-Stage Locking Mechanism
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Solution Overview
Problem
Medical syringes require a tamper-evident cap to ensure that the contents remain sterile and unadulterated before administration, as medical practitioners need assurance that the syringe has not been accessed or compromised.
Innovation Solution
A tamper-evident syringe tip cap with a two-stage mechanism, featuring a pre-activated and activated position, where the cap is initially removable via male Luer threads but becomes securely locked in a tamper-evident mode, requiring removal of an outer housing to access the inner core, providing visual indicators of tampering and preventing reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional removable cap is used on a syringe, then the cap is easy to remove and install, but it cannot provide reliable indication of tampering or prevent reuse
Solution Approach 1:
The cap is divided into multiple functional segments: an outer housing that threads onto the syringe, an inner core containing the Luer lock fitting, and a tip cover. These segments are arranged concentrically and can move relative to each other, allowing the cap to provide tamper indication through their relative positions while maintaining a manageable overall structure.
Solution Approach 2:
The cap employs a nested configuration where the inner core is positioned within the outer housing, and the tip cover encloses the inner core. This nesting arrangement allows multiple functional elements to be integrated in a compact form factor, providing complex tamper indication capabilities without excessive external complexity.
2Reliability
If a secure locked cap is used to prevent unauthorized access, then syringe sterility is protected, but the cap becomes difficult to remove when legitimate access is needed
Solution Approach 1:
The cap transitions between two dynamic states: a locked state where the outer housing is threaded onto the syringe and the tip cover obscures the Luer lock fitting, and an unlocked state where the outer housing can be unscrewed. This dynamic design provides secure protection during storage and transport while allowing easy access when needed by the authorized user.
Solution Approach 2:
The cap incorporates visual indicators (such as color-coded features or visible alignment marks) that change appearance based on whether the cap is in the locked or unlocked state, providing intuitive feedback to the user about the cap's status without requiring complex mechanical indicators.
3Adaptability or versatility
If a single-mode cap design is used, then the design is simple, but it cannot provide both easy removal for legitimate use and secure locking for tamper prevention
Solution Approach 1:
The cap incorporates a dynamic two-mode mechanism that allows it to function differently based on its state. In the first mode, the outer housing is threaded onto the syringe for secure locking. In the second mode, the outer housing can be unscrewed for easy removal. This dynamic design provides adaptability without requiring entirely separate cap designs for different functions.
Solution Approach 2:
The cap is designed to perform multiple functions within a single integrated structure: it provides tamper indication, sterility protection, and easy removal capability. The outer housing, inner core, and tip cover work together to achieve these multiple functions without requiring separate devices for each function.
Data Source
AI summary
A tamper-evident syringe tip cap is provided and includes an outer housing with an outer shell, and a tip cover secured to an upper end of the outer shell. An inner core has a female Luer lock fitting, a spindle projecting vertically from the fitting, and a sleeve matingly engaging the spindle and being constructed and arranged for releasably securing the outer housing to the inner core. The outer housing is movable relative to the inner core between a first, pre-activated position and a second, activated position.