Injection Device Cap with Rotating Sleeve for Needle Protection Removal
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Solution Overview
Problem
Existing injection devices face challenges in safely and easily removing the needle protection cap from the product container, which can lead to accidental needle exposure and increased risk of injury.
Innovation Solution
The injection device incorporates a mechanism with a cap that undergoes a combined axial-rotational movement, featuring a deformable engagement element and locking elements to securely remove the needle protective cap, ensuring safe and efficient detachment from the product container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle protection cap is removed by axial movement only, then the removal force is high, but the operation is difficult and safety is reduced
Solution Approach 1:
The patent transitions from pure axial movement to a combined axial-rotational movement for cap removal. The cap is designed with rotational capability around the longitudinal axis while simultaneously moving axially, allowing the removal force to be distributed across both rotational and axial components, thereby reducing the peak axial force required.
Solution Approach 2:
The patent introduces a dynamic removal mechanism where the cap can rotate during the removal process. The engagement elements are designed to allow rotational movement while maintaining axial connection, creating a dynamic removal action that reduces friction and engagement resistance compared to static axial pull-off.
2Reliability
If the engagement elements are made more robust to ensure secure needle protection cap removal, then the reliability improves, but the device complexity increases
Solution Approach 1:
The engagement mechanism is divided into multiple discrete engagement elements distributed around the cap's circumference. Each engagement element independently engages with corresponding features on the needle protection cap, distributing the engagement load and providing redundant engagement points, which enhances reliability without requiring a single complex engagement structure.
Solution Approach 2:
The patent combines multiple functions into the cap structure: the cap serves as both the protective cover and the removal mechanism carrier. The engagement elements are integrated into the cap body rather than being separate components, and the cap's rotational and axial movements are combined into a single removal action, reducing overall device complexity while maintaining secure engagement.
3Ease of manufacture
If the cap structure is simplified for easier manufacturing, then the ease of manufacture improves, but the ability to ensure safe removal of the needle protection cap deteriorates
Solution Approach 1:
The cap is designed as a multi-functional component that simultaneously serves as the protective cover, the removal mechanism carrier, and the interface for engagement with the needle protection cap. This universal design consolidates multiple functions into a single component, simplifying manufacturing while ensuring reliable removal through its integrated engagement elements and combined axial-rotational movement capability.
Data Source
AI summary
The invention relates to an injection device comprising a housing (1) for receiving a product container, which has a rigidly connected injection needle, and a cap (2) for removing a needle protection cap from the product container. The cap (2) comprises an engagement element (4) in order to carry out the removal of the needle protection cap from the product container while removing the cap (2) from the injection device, and the cap comprises a rotating sleeve (3), wherein the rotating sleeve (3) has a reverse rotation protection element, and the engagement element (4) or the housing (1) has a reverse rotation protection counterelement in order to allow a rotation of the rotating sleeve (3) in one direction and block the rotation in the opposite direction.