Medicament Delivery Cap Labyrinth Guidance Mechanism
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Solution Overview
Problem
Medicament delivery devices often require users to follow complex steps for removing the front cover, leading to potential malfunctions or injuries due to incorrect manipulation, especially for users who do not read instructions carefully or use multiple devices.
Innovation Solution
A sub-assembly with a housing and cap featuring a user-visible labyrinth and protrusion that guides the user in properly detaching the cap from the housing, providing both structural and visual cues for correct manipulation, ensuring the cap follows a specific path for detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex manipulation steps are required for cap removal, then the device can ensure proper attachment of medicament delivery member, but user safety and ease of operation deteriorate due to potential incorrect manipulation
Solution Approach 1:
The labyrinth is pre-formed on the cap or housing, and the protrusion is pre-positioned on the opposing component. When the user attempts to remove the cap, the protrusion automatically engages with the labyrinth path, guiding the removal action without requiring the user to remember complex steps. This preliminary arrangement of structural elements ensures correct manipulation is instinctive rather than instructional.
Solution Approach 2:
The labyrinth acts as an intermediary mechanism between the cap and housing. Instead of direct attachment/detachment, the labyrinth-protrusion interface mediates the removal process, forcing the cap to follow a specific guided path that ensures proper medicament delivery member attachment while simplifying user interaction to a single intuitive pulling motion.
2Manufacturing precision
If multiple manipulation steps are instructed, then proper device assembly is achieved, but device complexity and difficulty of detecting correct operation increase
Solution Approach 1:
The device performs its own guidance function through the self-evident labyrinth-protrusion mechanism. The structural design itself communicates the correct operation sequence without requiring external instructions. The protrusion naturally follows the labyrinth path, and the user can visually confirm the correct assembly state through the visible engagement of these elements, making the device self-explanatory and self-guiding.
3Reliability
If cap detachment requires specific manipulation sequence, then medicament delivery member attachment is ensured, but loss of information occurs when users confuse instructions between different devices
Solution Approach 1:
The labyrinth may be visualized through color coding or contrasting visual markers on the cap or housing surface. The protrusion path through the labyrinth can be made visually distinct, allowing users to immediately recognize the correct manipulation sequence without reading instructions. This visual information encoding prevents confusion between different devices by providing intuitive, device-specific visual cues that are self-explanatory.
Data Source
AI summary
A sub-assembly for a medicament delivery device, the sub-assembly having a housing extending along a longitudinal axis from a proximal end to a distal end; a cap releasably attached to the proximal end of the housing; wherein one of the cap and the housing has a user-visible surface extending in a circumferential direction relative to the axis, the surface having a cut-out; wherein the other one of the cap and the housing has a protrusion in the cut-out; and wherein the cut-out defines a user-visible labyrinth which the protrusion must follow during use in order for the cap to be detached from the housing.