Safety Syringe Needle Head Latch Structure
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Solution Overview
Problem
Existing safety syringe designs that use rotating transverse sliding grooves to protect the needle head from accidental exposure often lead to loosening issues, compromising safety and convenience for medical professionals.
Innovation Solution
A needle head structure featuring a latch plate with an embedding protrusion and a second sleeve with a guide and latch portion, along with a first sleeve having a guide, latch, and holding portion, which are configured to securely engage and protect the syringe body by a pulling and positioning method, enhancing safety and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rotating transverse sliding groove mechanism is used to protect the needle head, then the safety protection function is improved, but the reliability deteriorates due to loosening issues
Solution Approach 1:
The protective sleeve is divided into multiple segments with embedding protrusions and grooves that can move relative to each other. The segmentation allows the sleeve to collapse and lock securely around the needle, providing reliable protection without requiring complex rotating mechanisms that prone to loosening.
Solution Approach 2:
The embedding protrusions and grooves are pre-configured in specific positions and orientations before use. When the protective sleeve is activated, these pre-positioned features automatically engage with each other to secure the needle, eliminating the need for complex real-time adjustments or rotations that could lead to loosening.
2Object-affected harmful factors
If a complex rotating mechanism with multiple components is used, then the protection function is improved, but the device complexity increases
Solution Approach 1:
Multiple protective functions are merged into a single integrated protective sleeve structure. The embedding protrusions, grooves, and locking mechanisms are combined within one component rather than requiring separate rotating parts and assemblies, significantly reducing overall device complexity while maintaining effective needle protection.
Solution Approach 2:
The protective sleeve employs a nested structure where segments containing embedding features are integrated within the main sleeve body. This nesting allows the complex locking mechanism to be compactly housed within the simple outer sleeve geometry, reducing the visible and operational complexity of the device.
3Object-affected harmful factors
If a rotating transverse sliding groove is used to fix the sleeve, then the protection mechanism is improved, but the ease of operation deteriorates due to loosening risks
Solution Approach 1:
The protective sleeve features self-locking embedding protrusions and grooves that automatically engage and secure the needle position without requiring user rotation or adjustment. The mechanism serves itself by using the insertion motion alone to activate the locking features, eliminating complex user operations and reducing loosening risks from improper handling.
Data Source
AI summary
A needle head structure of a safety syringe includes a protecting cover, a first sleeve, a second sleeve, a syringe holder and a plunger. The first sleeve, second sleeve and syringe holder are structures with mutually latched embedding protrusion and latch portion. The plunger includes a guide channel, and is operated with the syringe holder to reduce a remaining liquid. The first sleeve, second sleeve and syringe holder are latched with one another to fix an end of the syringe holder. After the use of the syringe, a first sleeve is pulled towards a an end to link the second sleeve, so that the first sleeve is latched to an end of the second sleeve, and the other end of the second sleeve is fixed to the syringe holder, so as to provide a convenient operation to users and reduce the risk of being pierced by the needle head structure accidentally.