Syringe Needle Safety Assembly With Automatic Retraction Lock
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Solution Overview
Problem
Existing syringe safety devices, such as movable needle covers and retractable needles, either cause accidental punctures or have high production and sales costs, making them impractical for widespread use.
Innovation Solution
A safety device for syringes that automatically locks the needle during use and retracts it into the syringe body after administration, without user intervention, using a connector, main body, needle body, push element, and needle support to ensure universal compatibility and low production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If movable needle covers are used, then safety against accidental puncture is improved, but ease of operation deteriorates causing increased accidental punctures
Solution Approach 1:
The needle cover is designed to automatically return to the protective position after needle retraction without requiring manual operation. The elastic element stores energy during injection and automatically propels the cover back to cover the needle, making the system self-serving and eliminating the need for user intervention to reactivate safety protection.
Solution Approach 2:
The needle cover transitions from a static protective cover to a dynamic component that moves automatically in response to needle retraction. The cover is coupled to the needle via an elastic element that allows the cover to follow needle movement during injection and automatically return when the needle retracts, adapting its position dynamically to the operational state.
2Reliability
If retractable needle syringes are used, then safety against accidental puncture is improved, but production cost increases
Solution Approach 1:
The safety device is divided into separate modular components: a reusable syringe body and a disposable safety device assembly containing the needle, needle cover, and elastic element. This segmentation allows the complex safety mechanism to be manufactured as a separate unit and attached to standard syringes, reducing overall production costs compared to manufacturing entire retractable needle syringes.
Solution Approach 2:
The safety device including the needle and elastic mechanism is designed as a disposable component that is replaced after each use. This approach eliminates the need for expensive reusable retractable mechanisms while maintaining safety functionality, as the entire safety assembly is discarded after single use rather than requiring costly durable construction.
3Reliability
If manual needle neutralization is required, then safety control is improved, but ease of operation deteriorates causing user injury
Solution Approach 1:
The needle cover automatically re-protects the needle after injection without requiring manual repositioning by the user. The elastic element stores mechanical energy during the injection stroke and automatically propels the cover back to its protective position when the needle retracts, making the safety function self-activating and eliminating manual intervention requirements.
Solution Approach 2:
The needle cover remains in the protective position during storage and transport, and is designed to automatically return to this protective state after use. The elastic element is pre-loaded to ensure automatic return motion, performing the safety action in advance or automatically after the injection function is complete, without requiring user initiation.
Data Source
AI summary
A safety device for a syringe including a connector which can be coupled to a syringe, a main body provided with a cavity and which can be coupled to the connector so as to extend above it and a needle body for supporting and housing a needle or cannula, the needle body longitudinally extending in the connector and in the main body. The device further includes a push element which can be coupled to a distal end of the needle body and movable inside the connector by action of an axial thrust of a plunger of the syringe, and a needle support which can be coupled to the needle body and is operable by the push element between a locked position of the needle body, wherein the needle support is interposed between the connector and the needle body, and an unlocked position of the needle body.