Syringe Safety Shield Rotational Locking Mechanism
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Solution Overview
Problem
Existing needle shielding systems for syringes require activation force that is dependent on injection movement and may not allow for independent shielding after partial injection, posing usability challenges, especially for patients with age or weight-related limitations.
Innovation Solution
A syringe assembly with a safety shield that is longitudinally movable between retracted and activated positions, featuring a spring-urged mechanism and dual locking systems, allowing independent activation and ensuring the needle is covered after use, with a rotatable design for easy user operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the safety shield is manually activated after injection, then the needle can be protected, but the activation force becomes dependent on injection movement and cannot be independently adjusted
Solution Approach 1:
The spring is pre-loaded during assembly to store elastic potential energy, which is then released to automatically propel the safety shield forward to cover the needle after injection, eliminating the need for additional manual activation force
Solution Approach 2:
The safety shield system performs self-protection by using the spring's stored energy to automatically move the shield into the protective position, making the shielding action independent of user intervention or injection movement characteristics
2Ease of operation
If the safety shield is spring-urged towards the activated position, then independent shielding is enabled, but additional locking mechanisms are required to maintain positions
Solution Approach 1:
The locking mechanism acts as an intermediary between the spring force and the safety shield, using a cam surface and follower arrangement to convert rotational motion into axial positioning, thereby controlling the spring's energy release and maintaining shield positions without requiring complex multi-stage locking systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe and independent needle shielding without requiring additional force or movement during injection, ensuring user and patient safety by allowing shielding even after partial use, enhancing usability across various user conditions.
Implementation Method 1
a spring urging said safety shield towards said activated position
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The assembly comprises :a syringe barrel (12) having a needle (11), a tubular body (2) defining an enclosure, said barrel (12) extending at least partially within said enclosure; a safety shield (3) for the needle (11), longitudinally movable with respect to the tubular body (2) between a retracted position and an activated position; a spring (4) urging said safety shield (3) towards said activated position; a first locking mechanism (31) for locking the safety shield (3) in the retracted position, wherein the first locking mechanism (31) is manually releasable by a user so as to let the safety shield (3) reach the activated position, wherein the safety shield (3) is able to rotate within the body (2), and has a distal part (302) axially protruding from a distal part (202) of the body (2) for gripping the safety shield (3); the first locking mechanism (31) being configured to release the safety shield (3) when the safety shield (3) is rotated from a first angular position to a second angular position.