Fluid Injection Needle Unit with Retractable Cover

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Solution Overview

Problem

Conventional fluid injection needle units pose a risk of needlestick injury and infection due to exposed needles after use, as the needle film is detached from the unit, leaving the needle exposed.

Innovation Solution

A fluid injection needle unit design where a cover is coupled to the bottom end of the body after the needle body is inserted into the patient, using detachable mounting members to accommodate the needle and needle body within the cover, preventing exposure and infection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the needle film is detached from the conventional fluid injection needle unit after insertion, then the needle film can be removed from the patient, but the needle becomes exposed causing needlestick injury risk

Engineering Contradiction:

ImprovesafetyVSAvoidneedlestick injury

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The needle body is nested within the cover structure. After the needle film is detached from the patient, the cover automatically closes to enclose the needle body, preventing exposure. This nesting arrangement ensures the needle is always contained within the cover housing, eliminating the needlestick injury risk while maintaining the ability to detach the needle film for patient removal.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The cover acts as an intermediary protective element between the needle and the external environment. The cover includes a needle receiving portion that specifically accommodates the needle body, serving as a mediator that isolates the sharp needle from potential contact with healthcare workers or patients during the detachment and removal process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the cover is fixedly mounted onto the body before needle film insertion, then the needle is protected, but the needle cannot be inserted into the patient

Engineering Contradiction:

Improveneedle protectionVSAvoidneedle insertion

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The cover is designed with dynamic functionality, transitioning between an open state during insertion and a closed state during protection. The cover includes a movable cover body that can be separated from the body during the insertion phase to allow needle access, then automatically or manually closed after insertion to protect the needle. This dynamic behavior resolves the contradiction between protection and accessibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The cover is preliminarily positioned in an open state before needle insertion, allowing the needle to be exposed and inserted into the patient without obstruction. After the insertion is complete, the cover is then closed to provide protection. This preliminary positioning ensures that the protective function is activated only when needed, after the insertion operation is complete.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10449304B2Fluid injection needle unit having function of preventing needlestick injury and infection

Publication Date: 2019.10.22 WOO YOUNG MEDICAL CO LTD

AI summary

The present invention relates to a fluid injection needle unit having a function of preventing needlestick injury and infection wherein a cover, a needle body and a body are improved in shape, and after the needle body is inserted into a blood vessel of a patient, the cover is coupled to the bottom end periphery of the body and the needle body is detached from the body by means of detachable mounting members, so that a needle and the needle body are inserted unitarily into the cover to prevent the occurrence of the needlestick injury and infection.