Medical Liquid-Collection Injector Spiral Projection
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Solution Overview
Problem
In the context of enteral nutrition therapy, existing injectors face challenges in preventing medicinal liquid from attaching to the inner surfaces of male connectors, leading to potential bacterial growth and contamination, and in accurately managing the administered liquid amount during the simple suspension method.
Innovation Solution
A medical liquid collection injector with a tube end featuring a cylindrically-shaped tubular portion and a spiral projection, where the liquid collection needle is detachably mounted, forming a fluid-tight connection to prevent liquid attachment and ensure accurate dosing by not allowing it to leak between the needle and barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tube end of the injector is directly connected to the male connector, then the liquid can be administered to the patient, but the medicinal liquid attaches to the female screw of the male connector causing bacterial growth and contamination
Solution Approach 1:
A female connector is introduced as an intermediary component between the tube end of the injector and the male connector. The female connector has a tapered outer surface that fits into the tapered inner surface of the male connector, creating a barrier that prevents medicinal liquid from reaching and attaching to the female screw threads, thereby eliminating the contamination risk while maintaining secure connection
2Device complexity
If the liquid collection needle is permanently fixed to the barrel, then the structure is simpler, but the liquid leaks between the needle and barrel preventing accurate dosing
Solution Approach 1:
The liquid collection needle is divided into separate segments: the needle itself and the barrel with tube end. This segmentation allows for precise manufacturing of each component with proper sealing surfaces, enabling accurate fitting and leakage prevention while maintaining structural simplicity. The separable design also facilitates easier manufacturing and assembly
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A tube end (14) of a barrel (12) of an injector (1) includes a tubular portion (921) on which a spiral projection (925) is formed, and an inner circumferential surface of the tubular portion is a female tapered surface (922). A small-diameter portion (16) is formed between a liquid storing portion (15) into which a plunger (18) is inserted and the tubular portion (921). A base end (21) of a liquid collection needle (20) is fluid-tightly connected to the small-diameter portion (16), and a leading end of the liquid collection needle (20) protrudes from the tube end (14).