Indwelling Assembly Needle Deflection Control

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Solution Overview

Problem

The procedure for indwelling catheters in blood vessels is more complex and challenging due to needle deflection, especially when the needles are long, making puncture difficult.

Innovation Solution

An indwelling assembly with a hollow elongated outer member and an inner needle, where the outer member is movable relative to the inner needle after puncturing, allowing it to be positioned at a desired location in the blood vessel, and an elongated grip for removing the inner needle while keeping the outer member in place.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If long needles are used for indwelling catheters, then the catheter can reach deeper blood vessels, but needle deflection occurs making puncture difficult

Engineering Contradiction:

Improveneedle lengthVSAvoidpuncture reliability

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The needle assembly is divided into an inner needle and an outer needle, allowing the inner needle to perform the puncture while the outer needle provides support and stability, preventing deflection of the long needle assembly

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The outer needle acts as an intermediary that provides structural support to the inner needle during insertion, enabling the long needle assembly to maintain stability and prevent deflection while reaching deep blood vessels

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the inner needle is pulled out completely from the outer needle, then the inner needle can be removed from the patient, but the outer needle cannot be positioned at the desired location in the blood vessel

Engineering Contradiction:

Improveinner needle removalVSAvoidouter needle positioning precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The outer needle is designed to be movable relative to the inner needle after puncture, allowing it to be independently positioned at the desired location in the blood vessel while the inner needle is removed, providing dynamic adaptability during the procedure

Inventive Principle:

Principle #15Dynamics

3Reliability

If the outer needle is advanced with the inner needle as guide, then the outer needle can be inserted into the blood vessel, but the procedure becomes more complicated

Engineering Contradiction:

Improveblood vessel puncture reliabilityVSAvoidindwelling procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The inner needle is used to perform the preliminary puncture action and create the initial access path, allowing the outer needle to then be advanced along this established path, simplifying the overall procedure while maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250186688A1Indwelling assembly

Publication Date: 2025.06.12 TERUMO KK

AI summary

An indwelling assembly includes an inner needle, an inner needle hub fixed to the inner needle, a hollow elongated outer member in which the inner needle is positioned, an outer member hub fixed to the hollow elongated outer member, and an elongated grip connected to the inner needle hub. The grip includes a bottom and upstanding sides, with the upstanding sides and the bottom bounding a space in which is located the inner needle and the hollow elongated outer member. An elongated main body is positioned in overlying relation to the inner needle and covers at least a portion of the space. The elongated main body and the elongated grip include portions that are engageable with one another to retain the elongated main body and the elongated grip relative to one another. The portions that are engageable with one another include two projections spaced apart from one another.