Self-Destructing Syringe Conical Connector Assembly Design
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Solution Overview
Problem
Current disposable syringes face issues such as reuse leading to disease transmission, unstable retraction mechanisms, difficulty in mass production, and safety hazards due to complex design and high manufacturing accuracy requirements.
Innovation Solution
A self-destructive syringe design featuring a conical connector assembly with a thread conical connector, sealing ring, transition part, and hollow wedge, along with a plunger and barrel flanges, ensuring secure assembly, easy manufacturing, and automatic assembly capabilities, while preventing needle retraction beyond safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the retraction assembly uses an integral loop structure or small supporting jaw to locate with the barrel inner wall, then the structure is simple, but the firmness of location is low causing self-retraction risk
Solution Approach 1:
The retraction assembly is divided into separate components: the conical connector assembly (including locating structure) and the retraction mechanism. This segmentation allows the locating structure to be optimized independently for firmness while maintaining overall structural simplicity through modular design.
Solution Approach 2:
The locating structure uses multiple blades (typically 3-6 blades) that excessively engage with the barrel inner wall, providing redundant location points that ensure firmness and prevent self-retraction, going beyond the minimum single-point location approach.
2Device complexity
If the conical connector and locating structure are formed integrally, then the number of parts is reduced, but the manufacturing accuracy requirement increases and mass production becomes difficult
Solution Approach 1:
The conical connector and locating structure are manufactured as separate components and then assembled together. This segmentation allows each component to be molded independently with standard accuracy tolerances, avoiding the need for high-precision integral molding while maintaining structural integrity through assembly.
Solution Approach 2:
A separate locating structure component acts as an intermediary between the conical connector and the barrel, providing the necessary location function without requiring the conical connector itself to be precision-molded with locating features.
3Device complexity
If the retraction assembly has no shockproof design, then the structure is simple, but transportation shock causes self-retraction risk
Solution Approach 1:
The locating structure incorporates shock-absorbing features such as elastic blades or cushioning elements that are pre-designed to withstand transportation shocks before they occur, preventing the retraction assembly from dislocating or self-retracting during handling and shipping.
4Device complexity
If the barrel head has no prevention member for the retraction assembly, then the structure is simple, but the retraction assembly may be pushed out during assembly
Solution Approach 1:
The barrel head incorporates a prevention member (such as a flange or stop structure) that preliminarily opposes the forward motion of the retraction assembly during assembly, preventing it from being pushed out beyond the intended position and ensuring proper assembly without requiring complex control mechanisms.
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 enhances manufacturing efficiency, stability, and safety by facilitating automatic assembly, reducing the risk of retraction errors, and ensuring secure needle containment, thus improving medical safety and reducing the risk of occupational infections.
Implementation Method 1
The hollow wedge 7 is insertedly mounted in the transition part 6 and expands a blade 64 at a lower part of the transition part 6 via two annular inclined steps 73 on the hollow wedge 7
Implementation Method 2
The sealing ring 5 is press fitted among joint surfaces of the thread conical connector 4, the transition part 6 and an inner cavity wall surface of the front end of the barrel
Data Source
AI summary
Disclosed is a self-destructing syringe, comprising an outer casing, a core bar, a piston, a conical head component, a syringe needle and a protecting jacket. The syringe needle is fixed in the conical head component, and the conical head component consists of a threaded conical head, a sealing ring, a transition part and a hollow wedge. The protecting jacket is put around the syringe needle and is movably connected to the needle base of the syringe needle; the conical head component is fixed in the inner cavity at the front end of the outer casing; the piston is installed on the core bar; the main part of the core bar is sheathed inside the outer casing; and the front end of the core bar is inserted into the conical head component and is able to make the syringe needle return inside the outer casing.