Intradermal Needle Pivotable Protector Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Intradermal needles lack convenience in housing and handling, particularly in packaged articles, due to the exposure of the needle tip which poses a risk of accidental puncture and complicates disposal.
Innovation Solution
An intradermal needle design featuring a pivotable protector that can be compactly housed within a small packaged article, with a pivoting mechanism that securely covers the needle tip, preventing accidental exposure and facilitating safe disposal, includes a pivoting axle part positioned near the needle hub, a lock mechanism to maintain the closed position, and a non-return mechanism to prevent unintended pivoting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pivotable protector is added to the intradermal needle to prevent accidental puncture, then safety is improved, but device complexity increases
Solution Approach 1:
The protector is divided into separate components: a lid portion, an arm portion, and a pivot axle part. This segmentation allows each component to perform its specific function while simplifying the overall assembly and reducing complexity compared to a monolithic protector design.
Solution Approach 2:
The protector is designed with a pivotable connection between the lid portion and arm portion, allowing dynamic movement between open and closed positions. This dynamic mechanism enables the protector to transition from a protective closed state to an accessible open state during use, then return to closed state for safety.
2Volume of moving object
If the pivot axle part is positioned near the needle hub axis, then the packaged article size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The pivot axle part is positioned asymmetrically near the needle hub axis rather than at the center or at extreme positions. This asymmetric positioning optimizes the spatial arrangement to minimize the packaged article size while maintaining adequate clearance for the pivot mechanism, balancing compactness with manufacturability.
3Volume of moving object
If the interval between arms is made smaller to reduce protector size, then packaging convenience is improved, but the strength of the protector decreases
Solution Approach 1:
The arms are designed with varying local properties: they have greater thickness and strength at regions subjected to mechanical stress (near the pivot connection and at the distal ends), while being thinner in intermediate regions to minimize overall size. This non-uniform local quality distribution optimizes the balance between strength and compactness.
Data Source
AI summary
Provided are an intradermal needle having a protector that is movable from an open position near a needle hub to a closed position where a needle tip is covered, a packaged article, and an injection device. The protector has an arm that is supported in a freely pivotable manner by an axle pin positioned on the base end side of the wide diameter part of the intradermal needle, and a lid supported by the arm. With the axle of pivoting of the protector positioned near the needle hub, the lid may be housed compactly near the needle hub when the protector is in the open position.