Syringe Needle Locking Mechanism for Reuse Prevention
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Solution Overview
Problem
Existing disposable sterile syringes can be reused if the clamping inner cavity and spring barb are damaged, posing a risk of disease transmission due to potential needle exposure.
Innovation Solution
A syringe design featuring a pull-back element with a biasing force structure, including a cavity with elastic ends and a sealing ring, which locks the needle in place after use, preventing it from being pushed out again.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring barb and clamping inner cavity locking mechanism is used, then the syringe achieves self-destruction after use, but the needle may still be pushed out and reused if the locking components are damaged
Solution Approach 1:
The needle is pre-configured in a retractable state within the barrel, and the elastic component is pre-loaded to automatically drive the needle into the locking cavity after use, eliminating the need for additional destruction actions and ensuring the needle cannot be reused
Solution Approach 2:
The syringe is designed as a complete disposable unit where the barrel, needle, and elastic component form an integrated system that is discarded after single use, preventing any possibility of needle reuse regardless of locking mechanism integrity
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
Ensures the needle is securely locked within the syringe after use, eliminating the risk of reuse and disease transmission, thereby enhancing safety.
Implementation Method 1
a pull-back element with a biasing force structure, including a cavity with elastic ends
Implementation Method 2
a sealing ring
Data Source
AI summary
A syringe, comprising: a barrel, comprising a needle accommodating-cavity and a plunger accommodating-cavity; a pull-back element, accommodated in the needle accommodating-cavity, wherein a needle is mounted on the pull-back element; a plunger, disposed in the plunger accommodating-cavity and movable between pushed-in and pulled-out position, wherein a head portion of the plunger enters the cavity of the pull-back element proximate to the plunger accommodating-cavity and is engaged therein in the pushed-in position; a biasing force structure, disposed in the cavity of the pull-back element and/or the head portion of the plunger, wherein the head portion of applies a biasing force on the pull-back element through the biasing force structure, and when the head portion is moved to the pulled-out position, the biasing force structure causes the pull-back element and the needle to tilt with respect to the axis of the barrel through the biasing force.