Disposable Syringe Set with Dual-Thread Coupling for Device Compatibility
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Solution Overview
Problem
Conventional disposable syringes with screw-coupling structures face challenges in compatibility with non-screw type medical devices, leading to difficulties in coupling and potential drug leakage when used with different medical devices and syringes.
Innovation Solution
A disposable syringe set with a female-thread-type screw-coupling portion on the medicinal fluid inlet and a male-thread-type screw-coupling portion on the syringe needle hub, featuring an annular catching step to ensure secure engagement and prevent leakage, allowing compatibility with both screw and non-screw type medical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw-coupling structure is used to improve coupling firmness, then coupling strength is improved, but compatibility with non-screw type medical devices deteriorates
Solution Approach 1:
The coupling structure is divided into two distinct parts: an internal screw-coupling portion for secure attachment between syringe components, and an external protruding structure that interfaces with non-screw type medical devices. This segmentation allows each part to optimize its function independently.
Solution Approach 2:
The syringe inlet is designed with dual functionality: the internal screw-threaded structure provides firm coupling for syringe needle hubs, while the external protruding structure enables compatibility with non-screw type medical devices. This multi-functionality resolves the contradiction between coupling strength and adaptability.
2Ease of operation
If the medicinal fluid inlet protrudes from the syringe barrel to enable coupling, then ease of operation is improved, but drug leakage risk increases
Solution Approach 1:
The syringe needle hub is pre-equipped with an internal screw-coupling structure that engages with the protruding medicinal fluid inlet before fluid administration begins. This preliminary secure attachment prevents leakage during subsequent operations.
Solution Approach 2:
The sealing structure utilizes curved or conical surfaces that conform to the protruding inlet geometry, creating a tight seal that prevents drug leakage while maintaining ease of coupling. The curved surfaces allow for self-aligning engagement.
3Object-generated harmful factors
If the syringe needle hub is firmly coupled to the medicinal fluid inlet, then drug leakage is prevented, but ease of detachment deteriorates
Solution Approach 1:
The coupling mechanism transitions from a static firm attachment to a dynamic system where the syringe needle hub can be easily detached by rotating or pulling actions. The screw threads engage firmly during use but allow controlled disengagement, resolving the contradiction between secure coupling and easy detachment.
4Reliability
If a screw-coupling portion is formed on the medicinal fluid inlet, then coupling reliability is improved, but device complexity increases
Solution Approach 1:
The screw-coupling structure is localized only to the internal portion of the syringe inlet where it is most needed for secure attachment, while the external portion maintains a simpler protruding geometry for compatibility. This localized application of complexity minimizes overall device complexity while maintaining coupling reliability.
Data Source
AI summary
A disposable syringe set includes a syringe barrel in which a medicinal fluid inlet is formed and a plunger is fitted and coupled to an opening at the other side; a first screw-coupling portion formed on an outer circumference of the medicinal fluid inlet; a syringe needle hub in which a syringe needle is coupled to one end and an inner side at the other end is fitted and coupled to the outer circumference of the medicinal fluid inlet; and a second screw-coupling portion formed on an inner circumference of the syringe needle hub and configured to be coupled to the first screw-coupling portion. The first screw-coupling portion is formed as a female-thread-type coupling portion whose diameter is smaller than a reference diameter of the medicinal fluid inlet. The second screw-coupling portion is formed as a male-thread-type coupling portion configured to be coupled to the female-thread-type coupling portion.