Front-End Autoinjector Actuation With Safety Cap Locking
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Solution Overview
Problem
Existing autoinjectors face challenges with user confusion regarding activation ends, potential misuse due to unclear activation processes, and the need for improved safety features to prevent accidental operation and maintain sterility, while also requiring efficient manufacturing and material usage.
Innovation Solution
The autoinjector design includes a safety cap that locks the actuation unit until removed, allowing operation solely from the front end, maintains sterility through recapping, and features a power pack with a compact and efficient mechanism for needle protection and medicament delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a safety cap is removed to allow actuation, then the device can be activated, but accidental actuation may occur
Solution Approach 1:
The safety cap is removed in advance to expose the actuation unit, but the device remains in a locked state until the user applies sufficient force to overcome the locking mechanism. This preliminary exposure without immediate activation allows easy access while preventing accidental operation during normal handling.
Solution Approach 2:
A locking mechanism is implemented that actively prevents actuation until a specific condition is met (applying sufficient force). The locking arm engages with the actuation unit to counteract any unintended activation forces, while allowing deliberate activation when the user intentionally presses the front end with adequate force.
2Ease of operation
If the actuation unit is made accessible, then operation is simplified, but device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-actuating based on the force applied by the user. When the user presses the front end with sufficient force, the locking arm automatically disengages from the actuation unit, allowing activation without requiring separate locking/unlocking actions. This keeps the mechanism simple while providing reliable protection.
3Productivity
If manufacturing efficiency is improved by reducing parts, then material usage decreases, but safety features may be compromised
Solution Approach 1:
The locking arm is integrated as part of the main casing structure rather than being a separate component. This merging of functions allows the safety cap to lock the actuation unit through the integrated locking arm, maintaining reliable safety functionality while reducing the total number of parts and simplifying manufacturing processes.
Data Source
AI summary
An autoinjector (1) is disclosed. The autoinjector comprises a main casing (10); a cartridge assembly (30) disposed within the main casing (10). The cartridge assembly may include a cartridge (3) land a needle (40). A power pack (100) is disposed within the main casing (10) for moving the cartridge (31) and the needle (40) from a storage position to an injection position when actuated. An actuation unit (50) comprises a cartridge container (52) and a needle cover (60) disposed between the cartridge container (52) and the main casing (10). The actuation unit (50) is operably coupled to the power pack (110) and retractable from a first position to an actuation position for actuating the power pack. The needle cover (60) is extendable to an extended position covering the needle (40) when the cartridge (31) and the needle (40) are in the injection position. A safety cap (20) is removable from a mounted position on a front end of the main casing (10) to expose a front portion of the actuation unit (50).