Guide Wire Curved Section Coil Turn Contact

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Solution Overview

Problem

Conventional guide wires with curved sections often get caught in stenosis portions due to interference with calcified lesions, leading to decreased passing performance through blood vessels.

Innovation Solution

A guide wire design featuring a coil body with adjacent turns in contact on the outer side of the curved section, preventing lesion fragments from entering gaps and ensuring the distal portion can move freely through stenosis portions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a curved section is formed in the guide wire to pass through stenosis portion, then the guide wire can navigate through blood vessels, but lesion fragments enter gaps between element wires and cause the guide wire to get stuck

Engineering Contradiction:

Improvepassing performance through stenosis portionVSAvoidguide wire getting stuck in stenosis portion

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies local quality by making the coil body structure different in different regions: the curved section has adjacent turns in contact with each other (closed structure), while the straight section has spaced turns (open structure). This local structural differentiation prevents lesion fragment entrapment in the curved section while maintaining flexibility and navigation capability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of the conventional design where the curved section has gaps between turns for flexibility, this patent inverts the approach by making the curved section have contact between adjacent turns (no gaps), while the straight section has the gaps. This inversion prevents lesion fragments from entering the curved section while still allowing the guide wire to navigate through stenosis portions.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If adjacent turns of the coil body are in contact on the outer side of the curved section, then lesion fragments are prevented from entering gaps, but the flexibility of the curved section may be reduced

Engineering Contradiction:

Improveprevention of lesion fragment entrapmentVSAvoidflexibility of curved section

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The guide wire effectively avoids getting caught in stenosis portions, maintaining high passing performance by preventing lesion interference and ensuring flexibility and resistance to deformation.

Implementation Method 1

the distal end portion of the guidewire is elastically deformed into a curved portion

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

a coil body comprising a plurality of turns wound around a distal portion of the core shaft, wherein the coil body is formed by winding at least one winding element into a helical coil structure

Methodology Applied

Scientific EffectMechanical spring behavior: Spring

Data Source

PatentEP2918306B1Guide wire

Publication Date: 2020.11.04 ASAHI INTECC CO LTD

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AI summary

A guide wire 200 includes a core shaft 20 and a coil body 230 wound around a distal portion of the core shaft 20. The coil body 230 includes a straight section 232 in a straight state from a proximal end toward a distal direction and a curved section 234 arranged at a distal side of the straight section 232. Turns 242 of the coil body are in contact with each other on an outer side of the curved section 234 (at a border portion K between the curved section 234 and the straight section 232).