Needle-Shielded Prefilled Syringe for Needle-Safe Disposal
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Solution Overview
Problem
Existing prefilled syringes do not adequately prevent needle exposure during disposal, posing a risk of injury and requiring cumbersome shearing devices that are difficult to manage and may lead to needle loss or further injuries.
Innovation Solution
A needle-shielded prefilled syringe design incorporating a syringe barrel, needle, needle mounting member, shield unit, and needle guard unit, with features like stopping hooks and cantilever members to ensure the needle is encased during disposal and injection, preventing exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shearing device is used to destroy the needle before disposal, then the risk of needle injury is reduced, but the device complexity increases and the ease of operation deteriorates
Solution Approach 1:
The shield unit is integrated with the syringe barrel to form a unified structure, eliminating the need for separate shearing devices. The shield unit includes a shield main body connected to the syringe barrel and a needle protector unit that moves with the shield, creating a combined protection system that reduces overall device complexity while maintaining safety functionality.
Solution Approach 2:
The shield unit automatically encases the needle through its own structural design without requiring external shearing devices. The needle protector unit moves axially to expose or encase the needle based on injection progress, and the shield unit's locking mechanism automatically engages with the needle mounting member, enabling self-contained needle protection and disposal.
2Object-affected harmful factors
If a shearing device is carried for needle destruction, then needle safety is improved, but the ease of operation worsens due to the burden of carrying and remembering to use the device
Solution Approach 1:
The shield unit is integrated with the syringe barrel to form a unified structure, eliminating the need for separate shearing devices. The shield unit includes a shield main body connected to the syringe barrel and a needle protector unit that moves with the shield, creating a combined protection system that reduces overall device complexity while maintaining safety functionality.
Solution Approach 2:
The shield unit automatically encases the needle through its own structural design without requiring external shearing devices. The needle protector unit moves axially to expose or encase the needle based on injection progress, and the shield unit's locking mechanism automatically engages with the needle mounting member, enabling self-contained needle protection and disposal.
3Loss of substance
If the needle is sheared before disposal, then the volume of medical waste is reduced, but the reliability decreases due to potential needle loss or exposure during the shearing process
Solution Approach 1:
The needle is nested within the needle protector unit, which is in turn nested within the shield main body. This multi-layer nested structure ensures the needle remains contained throughout the disposal process, eliminating the risk of needle exposure or loss during shearing while maintaining compact waste volume.
4Object-affected harmful factors
If a shield unit is added to encase the needle, then the needle safety is improved, but the device complexity increases
Solution Approach 1:
The protection system is segmented into distinct functional components: the shield main body connected to the syringe barrel, the needle protector unit that moves axially, the locking element for engagement, and the cantilever member for elastic locking. This segmentation allows each component to perform its specific function efficiently while maintaining overall structural simplicity.
Solution Approach 2:
The needle protector unit is designed to move axially relative to the shield main body, transitioning between exposed and encased positions. The locking element and cantilever member provide dynamic locking and release mechanisms that engage automatically during normal operation, enabling the system to adapt its state based on injection progress without requiring complex control systems.
Data Source
AI summary
The present disclosure belongs to the technical field of prefilled syringes. Provided is a needle-shielded prefilled syringe. By means of a syringe barrel, a needle, a needle mounting member, a shield unit and a needle protector unit, the technical effect of encasing the needle so as to prevent a syringe from stabbing other people during disposal is achieved. The present disclosure has the following advantages: firstly, the shield unit is utilized to encase the needle, so that the needle is not exposed to stab other people, and while the needle is exposed, the shield unit does not detach from the barrel; secondly, a plurality of stopping hooks are provided, so that the effect that the shield unit is fixed on a circumferential surface of the barrel when being opened is achieved, and the shield unit does not slide down during an injection process.