Retractable Blood Taking Needle with Interference Fit Safety Lock

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Solution Overview

Problem

Current blood taking needles face issues of high production costs, complex production processes, inconsistent quality, complex operation for medical personnel, and inadequate safety, leading to frequent injuries and infections among medical staff.

Innovation Solution

A retractable blood taking needle design featuring a core rod with interference fits, a transparent outer sleeve for blood flow observation, and silicone lubrication, combined with a piston and outer sleeve system that prevents forward and backward movement to ensure safe retraction and disposal, along with a duct and joint structure for stability and ease of use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional blood taking needles are used, then the structure is simple and production cost is low, but safety is poor and needlestick injuries occur frequently

Engineering Contradiction:

ImprovesafetyVSAvoidstructure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The needle is nested within the outer sleeve, which can slide over the needle to cover it after blood collection. The core rod is nested within the outer sleeve as well, forming a compact nested structure that enables safety retraction while maintaining a relatively simple overall device configuration.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The outer sleeve is designed to be movable relative to the needle and core rod, allowing it to slide forward to cover the needle after use. This dynamic mechanism transforms the static needle into a retractable safe structure without significantly complicating the device.

Inventive Principle:

Principle #15Dynamics

2Reliability

If safe blood taking needles with retraction mechanisms are introduced, then safety improves, but production cost increases

Engineering Contradiction:

ImprovesafetyVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The device is divided into distinct segments: needle, needle hub, core rod, outer sleeve, and piston. Each component can be manufactured separately using standard machining processes, then assembled through simple interference fits and snap rings, reducing overall production complexity and cost.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The entire blood taking device is designed as a disposable single-use item. The needle, core rod, and outer sleeve are made from inexpensive materials that can be quickly manufactured and disposed of after one use, eliminating the need for expensive sterilization and maintenance infrastructure.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If complex safe blood taking needles are used, then safety may improve, but operation becomes complex for medical personnel

Engineering Contradiction:

ImprovesafetyVSAvoidoperation simplicity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The outer sleeve is pre-positioned to cover the needle before use. After blood collection, the user simply pushes the outer sleeve forward to retract the needle, eliminating the need for complex manual retraction maneuvers and reducing operational complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The device performs its own safety retraction function automatically when the outer sleeve is pushed forward. The interference fit between components and the snap ring mechanism provide self-locking and self-contained operation, requiring minimal user intervention and training.

Inventive Principle:

Principle #25Self-service

4Manufacturing precision

If quality assurance measures are implemented, then production quality improves, but production process becomes complex

Engineering Contradiction:

Improveproduction qualityVSAvoidproduction process

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The design uses standard interference fit parameters and tolerance ranges that can be controlled through conventional machining processes. By establishing clear parameter specifications for the interference fits between components, consistent quality can be achieved without requiring overly complex manufacturing processes.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9314199B2Disposable sterile retracting blood taking needle

Publication Date: 2016.04.19 SHANGHAI JINTA MEDICAL

AI summary

A disposable sterile retracting blood taking needle consists of an end cover, a protective sleeve, a needle guard, a needle, a needle hub, a core rod. An outer sleeve, a piston, a sheath and a blood taking needle. The piston is arranged in a clamping groove of the core rod; the outer sleeve is sleeved on the core rod and the piston; the piston and the outer sleeve are in interference fit; inner holes of the needle, the needle hub, the core rod and the blood taking needle are communicated; the core rod and the outer sleeve are made of transparent materials; blood backflow is judged by blood flowing in a passage in the core rod; and after blood taking is completed, a medical worker presses a blood taking position of the blood taking needle with one hand, presses the outer sleeve with a finger of the other hand and pulls the needle guard to move back with other fingers of the other hand, so that a snap ring of the core rod enters a slot of the outer sleeve and is locked, and the blood taking needle is hidden in a cylinder of the outer sleeve, and thus the aim of safety is fulfilled.