Guide Wire Leading Tip With Protrusions for Lesion Crossing

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Solution Overview

Problem

Existing guide wires face challenges in effectively passing through stenosis or occlusion sites in blood vessels due to insufficient passing performance.

Innovation Solution

A medical device with a leading portion featuring a loop-shaped structure and protruding portions on its surface, designed to enhance the guide wire's ability to penetrate and cut through lesions by providing enhanced traction and prevention of slipping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional smooth guide wire is used, then the device complexity is low, but the passing performance through lesions is insufficient

Engineering Contradiction:

Improvepassing performanceVSAvoidsurface structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by providing protruding portions only at specific locations on the leading portion surface rather than uniformly across the entire wire. This localized modification enhances traction at critical points during lesion penetration while maintaining overall wire simplicity and flexibility.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of making the wire surface smoother to reduce friction, the patent inverts the approach by adding protruding portions that increase surface roughness. This counterintuitive modification provides mechanical interlocking with the lesion, improving passage through stenosis despite increased surface complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

2Strength

If the leading portion has a smooth surface, then the manufacturing precision is high, but the traction and prevention of slipping are insufficient

Engineering Contradiction:

Improvetraction forceVSAvoidsurface uniformity

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The protruding portions are strategically positioned on the leading portion surface to provide localized traction points. This allows the majority of the wire surface to maintain smooth manufacturing while specific areas gain enhanced grip capability for preventing slipping during lesion penetration.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The wire surface is segmented into smooth regions and protruding portion regions. This segmentation allows different surface characteristics to coexist, with smooth areas maintaining manufacturing precision and protruding areas providing mechanical traction, effectively resolving the contradiction between surface uniformity and traction force.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260076689A1Medical device and method for manufacturing medical device

Publication Date: 2026.03.19 ASAHI INTECC CO LTD

AI summary

A medical device, such as a guide wire, is to be inserted into a living body lumen such as a blood vessel. The medical device includes a main body part and a leading portion that is connected to a distal end of the main body part and enters a lesion, and the leading portion includes a protruding portion on a surface of the leading portion.