Injection Pen Needle Locking Sleeve for Post-Use Needle Shielding

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Solution Overview

Problem

Existing injection pen needles have a safety hazard due to the needle head retracting unintentionally, posing a risk of puncturing during handling after use.

Innovation Solution

The injection pen needle features a design with a sliding sleeve, limit ring, and sliding blocks that prevent the needle head from retracting by rotating and locking into position, using sliding bevels and grooves to secure the needle head within the sleeve.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the sliding sleeve is pressed to enable the needle head to stretch out for injection, then the injection function is achieved, but the needle head may be exposed again during handling after use due to accidental pressure on the sliding sleeve

Engineering Contradiction:

Improveinjection operationVSAvoidsafety after use

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The limit ring with sliding blocks is pre-positioned to rotate and lock the sliding sleeve in its retracted state after injection. This preliminary locking action prevents accidental retraction during handling, addressing the safety concern while maintaining the ease of injection operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The sliding blocks on the limit ring create a counteracting force that prevents the sliding sleeve from moving downward again after injection. This preliminary anti-action counteracts any accidental pressure that might cause the needle head to expose, thereby improving safety without affecting the injection function.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If a limit ring with sliding blocks is added to prevent needle head retraction, then safety after use is improved, but the device complexity increases

Engineering Contradiction:

Improvesafety after useVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The limit ring with sliding blocks is nested within the existing sleeve structure, where the sliding blocks move within grooves formed in the sliding sleeve. This nesting approach integrates the safety mechanism into the existing design, minimizing additional complexity while achieving the safety function.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The limit ring is segmented into multiple sliding blocks that independently interact with the sliding sleeve grooves. This segmentation allows the complex safety function to be divided into simpler, modular components, making the overall device easier to manufacture and maintain despite the added safety feature.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12502487B2Injection pen needle

Publication Date: 2025.12.23 ZHEJIANG KINDLY MEDICAL DEVICES CO LTD

AI summary

The present disclosure provides an injection pen needle, which includes a needle head, a needle seat, an outer sleeve, a sliding sleeve and a limit ring, wherein the needle head is arranged on the needle seat; the needle seat comprises baffle plates; the outer sleeve is arranged on the needle seat in a sleeving manner; the lower part of the sliding sleeve enters the outer sleeve and is adapted to move up and down in the outer sleeve, and a channel hole, from which the needle head can penetrate out, is formed in the top of the sliding sleeve; the limit ring is arranged in the outer sleeve; the limit ring comprises sliding blocks; the bottom of the sliding sleeve pushes against the limit ring; and when the sliding sleeve moves up and down in the outer sleeve.