Guide Wire Distal End Joint Strength

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Solution Overview

Problem

Conventional guide wires face the issue of the coil body detaching from the distal end joint part during operation, which compromises the stability and effectiveness of the guide wire in treating vascular stenosis and calcification-related occlusions.

Innovation Solution

A guide wire design featuring a core shaft made of a first material, a coil body formed by twisting first and second element wires of different materials, and a distal end joint made of the first material that wraps the second element wires, where the second wires have a higher melting point, enhancing the joint strength and preventing detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the coil body is joined to the distal end joint part using conventional methods, then the guide wire can be manufactured, but the coil body may detach during operation

Engineering Contradiction:

Improvecoil body attachment reliabilityVSAvoidjoint strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The coil body is segmented into first element wires (made of the same material as the distal end joint part) and second element wires (made of different material). This segmentation allows the first element wires to be continuously joined to the distal end joint part, creating a reliable attachment that prevents detachment during operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the material parameter of the first element wires to match the distal end joint part material. This material parameter change enables continuous joining and welding, significantly improving the joint strength and preventing coil body detachment while maintaining the necessary flexibility and resiliency.

Inventive Principle:

Principle #35Parameter changes

2Strength

If the distal end joint part is made continuous from the core shaft and first wire, then the joint strength is enhanced, but the manufacturing complexity increases

Engineering Contradiction:

Improvejoint strengthVSAvoidstructure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The distal end joint part is merged with the core shaft and first element wires through continuous joining, forming an integrated structure. This merging enhances joint strength while the use of the same material throughout simplifies the manufacturing process compared to joining dissimilar materials.

Inventive Principle:

Principle #5Merging (Combining)

3Strength

If the second wires have a higher melting point than the first material, then the joint strength is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvejoint strengthVSAvoidwelding precision

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The coil body has local quality variation where the first element wires have the same material properties as the distal end joint part (lower melting point), while the second element wires have different properties (higher melting point). This local quality differentiation allows precise welding at the joint area without affecting the overall coil structure, enhancing joint strength while maintaining manufacturability.

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 prevents the coil body from detaching from the distal end joint part, ensuring stability and improved joint strength, allowing for successful navigation and treatment of vascular stenosis and calcification-related occlusions.

Implementation Method 1

the distal end joint part is made of the first material and is continuous from the distal end of the core shaft and the distal end of the first element wire

Methodology Applied

Scientific EffectMaterial continuity:

Implementation Method 2

the distal end joint part wraps the distal ends of the plurality of second element wires

Methodology Applied

Scientific EffectMechanical wrapping:

Data Source

PatentUS11420028B2Guide wire

Publication Date: 2022.08.23 ASAHI INTECC CO LTD

AI summary

A guide wire that includes a core shaft that is made of a first material, a coil that is provided to cover an outer periphery of the core shaft and is formed by twisting a first wire made of the first material and a plurality of second wires made of a second material different from the first material, and a distal end joint that joints a distal end of the core shaft and a distal end of the coil, and the distal end joint is made of the first material and is continuous from the distal end of the core shaft and the distal end of the first wire, and the distal end joint wraps the distal ends of the plurality of second wires.