Protective Safety Cap Assembly for Secure Shield Removal
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Solution Overview
Problem
Existing medicament delivery devices face challenges in the assembly and attachment of safety caps due to tight tolerances and precise alignment requirements, which complicate the process and are not optimal from a manufacturing perspective.
Innovation Solution
A protective cap arrangement with a tubular body and a medicament delivery member shield remover, featuring attachment elements such as circumferential flanges and distally directed arms, allows for easy assembly by inserting the remover from the proximal end and attaching a lid, simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remover is attached to the body of the safety cap by tongues or ledges interacting with grooves or cut-outs, then the attachment is secure, but the assembly process requires tight tolerances and precise alignment making it difficult and time-consuming
Solution Approach 1:
The safety cap is divided into three separate components: the tubular body, the remover, and the lid. This segmentation allows each component to be manufactured independently with standard tolerances, and then easily assembled together without requiring precise alignment between multiple features.
Solution Approach 2:
The remover is pre-positioned within the tubular body before the lid is attached. This preliminary arrangement ensures the remover is correctly located without requiring complex alignment during final assembly, as the lid simply snaps onto the body and secures the pre-positioned remover.
2Strength
If the remover is inserted into the body from the distal end with attachment elements inter-connecting, then the attachment is firm, but the assembly process is complex and time-consuming
Solution Approach 1:
Instead of attaching the remover to the body from the distal end through complex inter-connecting elements, the lid is attached to the body from the proximal end. This inverted approach simplifies the assembly sequence and reduces the time required while maintaining firm attachment through the snap-fit mechanism.
Solution Approach 2:
The remover is nested within the tubular body, and the lid is then attached to enclose both. This nesting arrangement allows for simple sequential assembly without requiring complex alignment or multiple attachment steps, significantly reducing assembly time.
3Reliability
If precise alignment and tight tolerances are used for component connection, then the attachment is reliable, but the manufacturing efficiency is reduced
Solution Approach 1:
The attachment mechanism uses a snap-fit design that relies on elastic deformation and friction rather than tight tolerances. This parameter change from precision-fit to elastic-fit allows for standard manufacturing tolerances while maintaining reliable attachment, thereby improving manufacturing efficiency.
Solution Approach 2:
The safety cap assembly is designed as a disposable component where the lid and remover are simple, inexpensive parts that can be manufactured with standard tolerances. This approach prioritizes manufacturing efficiency and cost-effectiveness over long-term reusability, aligning with the disposable nature of the product.
Data Source
AI summary
A protective cap is presented that is releasably connected to a medicament delivery having a generally tubular body and a medicament delivery member with a shield to be removed when the protective cap is removed, attachment elements for holding a generally tubular medicament delivery member shield remover within the protective cap and a lid attached to the cap body for holding the medicament delivery member shield remover in position.