Self-Destructing Syringe Structure for Zero-Position Push Stability
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Solution Overview
Problem
Existing retractable self-destructing injection syringes face issues with the self-destructing function being accidentally triggered when the injection rod is pushed to the zero position, leading to unusability and potential medical accidents during use.
Innovation Solution
A composite safety self-destructing injection syringe design featuring a sealing ring with convex ribs, a spring sleeve with clamping blocks and a tapered clamping joint, and a rear cover with a convex rib, allowing repeated zero-position pushing without triggering the self-destructing function, and ensuring safe needle retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the self-destructing function is triggered when the injection rod is pushed to the zero position, then the syringe prevents reuse, but the syringe becomes unusable during normal operation requiring multiple dispensing
Solution Approach 1:
The self-destructing mechanism is segmented into distinct triggering conditions: normal dispensing pushes (which allow return to zero position) versus actual injection completion (which triggers destruction). The sealing ring with convex ribs and buffer cavity creates separate operational phases that prevent accidental triggering during routine dispensing while ensuring destruction after use.
Solution Approach 2:
The sealing ring is pre-positioned with convex ribs that engage with the buffer cavity before injection occurs. This preliminary configuration allows the injection rod to be pushed to zero position multiple times for dispensing without triggering destruction, while the pre-set mechanism ensures automatic triggering only after the intended injection is complete.
2Ease of operation
If the sealing ring is positioned to allow repeated zero-position pushing, then the syringe can be used for multiple dispensing, but residual liquid remains in the injection tube
Solution Approach 1:
The convex ribs on the sealing ring change the positional parameter of the sealing interface relative to the injection tube. By positioning the sealing ring such that the convex ribs engage with the buffer cavity at the zero position, the system allows complete expulsion of liquid during injection while preventing over-pushing that would leave residual liquid in the tube after repeated dispensing operations.
3Reliability
If the needle retracts into the injection syringe after injection, then the self-destructing function is achieved, but safety performance is insufficient
Solution Approach 1:
The sealing ring acts as an intermediary element between the injection rod and the self-destructing mechanism. It mediates the force transmission such that normal dispensing operations do not trigger the destruction mechanism, while the intended injection completion does. This intermediary prevents harmful accidental triggering during safe operation while maintaining the self-destructing function for waste prevention.
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 repeated use of the syringe without triggering the self-destructing mechanism, reduces residual liquid, prevents leakage, and ensures safe needle retraction, minimizing medical accidents.
Implementation Method 1
a spring sleeve connected between said sealing rubber plug and injection rod, wherein outer side walls at both ends of the spring sleeve are respectively clamped with the sealing rubber plug and the injection rod
Data Source
AI summary
A composite safety self-destructing injection syringe comprises an injection tube, a needle seat, a sealing rubber plug, and an injection rod; an inside of the injection tube is provided with a sealing ring, and a rear end of the needle seat contacts and limits the position with the sealing ring by a through hole; a spring sleeve is connected between the sealing rubber plug and the injection rod, and outer side walls at both ends of the spring sleeve are respectively clamped with the sealing rubber plug and the injection rod; an end surface of the spring sleeve close to the sealing rubber plug is provided with a clamping joint, and an end of the injection rod away from the spring sleeve is movably connected with a rear cover. The self-destructing function will not be triggered when the injection rod is pushed to the zero position.