Injection Device Cap with Inward Barbs for Needle Shield Removal
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Solution Overview
Problem
Existing injection devices face difficulties in easily removing the rubber needle shield from the syringe, which can be uncomfortable for users and requires additional steps, complicating the injection process.
Innovation Solution
A cap with an engaging member featuring inwardly extending barbs or hooks that attach to the rubber needle shield, allowing it to be retained within the cap when removed from the device, eliminating the need for separate removal and simplifying the user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber needle shield is fitted tightly over the needle to seal and protect it, then the needle is well protected, but the needle shield becomes difficult to hold and remove from the needle syringe
Solution Approach 1:
The needle shield removal function is segmented from the shield itself and transferred to the cap. The cap is divided into a main body and an engaging member, where the engaging member specifically interacts with the needle shield to facilitate its removal from the needle syringe.
Solution Approach 2:
The engaging member acts as an intermediary between the cap and the needle shield. It provides a gripping interface that allows users to easily hold and remove the needle shield without directly handling the slippery rubber shield itself.
2Reliability
If the rubber needle shield is positioned close to the needle for effective sealing, then the seal is improved, but users feel uncomfortable about removing the needle shield
Solution Approach 1:
The engaging member serves as an intermediary that bridges the gap between the user's hand and the needle shield. It provides a comfortable gripping surface that is positioned away from the needle, allowing users to remove the shield without feeling uncomfortable about direct proximity to the needle.
Solution Approach 2:
The engagement interface is extended into a third dimension by having protruding elements that extend inwards through openings in the cap body. This creates a spatial relationship where the engaging member can interact with the needle shield while maintaining user comfort.
3Ease of operation
If the cap is made large for easy removal, then the cap is easily handled, but the overall device complexity increases
Solution Approach 1:
The cap's functionality is segmented into two distinct parts: the main body for handling and the engaging member for interaction with the needle shield. This segmentation allows the main body to be optimally sized for handling without unnecessarily increasing overall device complexity.
Solution Approach 2:
The engaging member with its array of protruding elements provides multi-functionality, serving both to grip the needle shield for removal and to maintain structural integration with the cap body, thereby achieving enhanced functionality without proportional increases in complexity.
Data Source
AI summary
An injection device comprises an injector body arranged for mounting a syringe with a needle shield; and a cap disposed at one end of the injector body. The cap comprises a main body with a first open end and a second closed end, the main body comprising one or more openings through an outer surface; and an engaging member disposed externally on the main body, which comprises one or more protruding elements arranged to extend inwards through the one or more corresponding openings in the outer surface of the main body and configured to engage with the needle shield.