Dual-Ring Safety Assembly Prevents Needle Rotation
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Solution Overview
Problem
Existing safety devices for medical needles can rotate relative to the syringe tip during use, posing a risk of needle stick injury due to deformation of the mounting ring during sterilization, which reduces the clipping force and leads to unintentional exposure of the needle.
Innovation Solution
A safety assembly with an attachment ring comprising an inner and outer ring that snap together, featuring mutually engaging elements to prevent rotation, including an inner ring with an inner recess for glue application and an outer ring with a peripheral groove and inwardly protruding members, ensuring a secure and stable connection to the medical container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single mounting ring is used to attach the safety device to the syringe tip, then the device structure is simple, but the connection reliability is reduced due to rotation during sterilization
Solution Approach 1:
The mounting ring is divided into two separate rings: an inner ring that attaches to the syringe tip and an outer ring that holds the safety device. This segmentation allows each ring to perform its specific function independently, preventing rotation while maintaining structural simplicity.
Solution Approach 2:
The inner ring is nested within the outer ring, with the inner ring attached to the syringe tip and the outer ring attached to the inner ring. This nested configuration allows the mounting structure to remain compact while providing multiple attachment points to eliminate rotation.
2Reliability
If the mounting ring is sterilized after assembly, then the medical device meets sterilization requirements, but the clipping force is reduced due to deformation
Solution Approach 1:
By separating the mounting ring into two parts, the patent allows the inner ring to be sterilized independently while maintaining its structural integrity. The outer ring can be attached after sterilization, ensuring the clipping force is not compromised by sterilization-induced deformation.
3Ease of operation
If the protective arm can rotate relative to the syringe tip, then the ease of operation is improved, but the safety is reduced due to potential needle exposure
Solution Approach 1:
The protective arm is separated from the mounting structure, allowing it to rotate freely for ease of operation while the dual-ring mounting system prevents rotation at the attachment point, eliminating the risk of needle exposure.
Data Source
AI summary
The invention relates to a safety assembly for preventing needle stick injury with a needle having a proximal end fixed to a tip of a medical container and a pointed distal end, the safety assembly having: an attachment ring fixed to the tip of the container and a safety device to cover at least the distal end of the needle, the safety device attached to the attachment ring. The safety assembly has an attachment ring having an inner ring and an outer ring to be snapped onto each other, the inner ring having an inner recess for applying glue between the inner ring and the tip, and the inner ring and outer ring having mutually engaging elements preventing any rotation of the outer ring relative to the inner ring.