Pivoting Syringe Needle Cover for Injection Safety
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Solution Overview
Problem
Existing injection needle safety instruments either require post-use assembly, cause interference during injection, or have complex structures that increase costs and hinder operability due to protruding components that obstruct the view during use.
Innovation Solution
A syringe with an integrated injection needle safety instrument featuring a base portion, a cover portion, and a hinge portion with a pivot axis orthogonal to the barrel axis, allowing the cover to pivot between exposed and covered positions without interfering with injection, and constructed from a single resin member for simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protection housing is fixed only while the pointed end of the needle tube is covered, then needle safety is improved, but the protection housing causes interference during injection and handleability deteriorates
Solution Approach 1:
The protection housing is designed to be movable rather than fixed, allowing it to pivot between a retracted position during injection and a covering position after use. The hinge mechanism enables dynamic adjustment of the protection housing position based on operational needs, resolving the contradiction between safety and handleability.
2Reliability
If the manual operation portion or shield protrudes outward from the syringe, then the shield can cover the needle tip, but the structure becomes complicated and costs increase
Solution Approach 1:
The protection housing is integrated with the syringe body through a hinge mechanism, merging the protective function into the existing syringe structure. This integration eliminates the need for separate protruding components while maintaining the needle coverage capability, thus reducing structural complexity and manufacturing costs.
3Reliability
If the manual operation portion or shield protrudes outward, then needle coverage is achieved, but the view of the doctor is cut off and operability deteriorates
Solution Approach 1:
The protection housing pivots on a hinge axis that allows it to be positioned out of the way during injection, providing an unobstructed view for the operator. After injection, the same housing can pivot to cover the needle tip, maintaining safety without permanently obstructing the view or interfering with operability.
4Adaptability or versatility
If the injection needle safety instrument is assembled after use, then attachment flexibility is improved, but time loss increases and convenience deteriorates
Solution Approach 1:
The protection housing is pre-assembled to the syringe body through the hinge mechanism before use. This preliminary assembly eliminates the need for post-use attachment operations, saving time and improving convenience while maintaining the adaptability of the safety instrument to different syringe types.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A syringe (1) includes a barrel (10), a plunger, an injection needle (30), and an injection needle safety instrument (40). The injection needle safety instrument (40) has a base portion (41) fixed to the barrel (10), a cover portion (42) which can cover a pointed end of a needle tube (31) included in the injection needle (30), and a hinge portion (43) which pivotably couples the base portion (41) and the cover portion (42) to each other. The cover portion (42) is constructed to be pivotable between a first position at which the cover portion is held to the base portion (41) as a first locked portion (42c) is locked by a locking portion (41c) of the base portion (41) and a second position at which the cover portion covers the pointed end of the needle tube (31) and is held to the injection needle (30) as a second locked portion (42b) is locked to the injection needle (30). The cover portion (42) is tilted toward the barrel (10) while it is arranged in the first position.