Safety Syringe Retraction Structure to Prevent False Triggering
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Solution Overview
Problem
Existing safety syringes face issues with complex and inefficient installation due to the hidden location of the retraction spring, and unreliable elastic rubber rings that can prematurely release, posing a risk of accidental needle exposure.
Innovation Solution
A safety syringe design featuring guide grooves and guide blocks on the push rod, a compression spring between the piston mounting portion and guide blocks, and a retractable rod with engaging portions and guide surfaces, ensuring a visible and efficient installation process and preventing false triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retraction spring is sleeved over the retractable rod and located inside the barrel body of the push barrel, then the needle retraction function is achieved, but the installation becomes more complicated and inefficient due to the spring being in the blind area of the field of vision
Solution Approach 1:
The retraction spring is extracted from the blind area inside the barrel body and repositioned to be visible during assembly. The spring is now located in a position that can be observed and accessed during installation, allowing for easier and more efficient assembly while maintaining the needle retraction function.
2Stability of the object's composition
If the elastic rubber ring is used as a limiting structure to obstruct the retractable rod, then the initial state is maintained, but the reliability is poor and there is a risk of premature release
Solution Approach 1:
The elastic rubber ring, which has poor reliability and is prone to premature release, is replaced with a more reliable limiting structure. The new structure uses a robust mechanical design that maintains the initial state reliably without the risks associated with elastic rubber ring failure.
3Speed
If the potential energy of the retraction spring drives the elastic rubber ring to break through the limit ring, then the needle retraction is activated, but the risk of accidental exposure increases due to premature release
Solution Approach 1:
The design incorporates a reliable limiting structure that prevents premature activation of the retraction mechanism. The new structure ensures that the potential energy of the retraction spring is only released when intended, preventing accidental needle exposure while maintaining the speed of retraction when properly activated.
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
The design provides a reliable and efficient needle retraction mechanism with a higher potential energy utilization efficiency, faster retraction speed, and reduced risk of accidental exposure, enhancing safety and convenience.
Implementation Method 1
the potential energy of the retraction spring drives the elastic rubber ring to have a tendency to break through the limit ring
Data Source
AI summary
A safety syringe, including a syringe barrel, a needle holder, an injection needle, a ring plug, a push rod, a retractable rod, and a compression spring, where at least two guide grooves extending in an axial direction and passing through a retraction cavity are evenly distributed in an outer wall of the push rod along a circumferential direction; a stopper projecting portion protruding from a groove wall of each of the guide grooves is provided at a position of the guide groove close to a distal end. In the structure, based on the structures of the guide blocks and the stopper projecting portion, a larger breakthrough force is required during release of the potential energy of the compression spring, and there is almost no possibility of false triggering, ensuring better reliability.