Rotating Guide Wire Tip Structure for Calcified Lesion Passability

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Solution Overview

Problem

Existing guide wires face challenges in achieving high passability through lesions in blood vessels.

Innovation Solution

A medical device with a leading portion that rotates to efficiently drill through lesions, featuring a loop-shaped structure and a spiral groove on its outer peripheral surface to enhance lesion passability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the outer diameter of the coil strand increases from distal end toward middle portion, then the structural strength of the guide wire is improved, but the passability through the lesion deteriorates

Engineering Contradiction:

Improvestructural strengthVSAvoidpassability through lesion

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The guide wire is divided into distinct functional segments: a leading portion with a smaller outer diameter for penetrating the lesion, and a main body portion with a larger outer diameter for providing structural strength. This segmentation allows each part to optimize its function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the guide wire are given different local properties: the leading portion has a smaller diameter and higher flexibility for lesion penetration, while the main body has a larger diameter and higher strength for support. This local differentiation resolves the contradiction between overall strength and local passability.

Inventive Principle:

Principle #3Local quality

2Reliability

If the leading portion has a small outer diameter, then the passability through the lesion is improved, but the structural strength deteriorates

Engineering Contradiction:

Improvepassability through lesionVSAvoidstructural strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The guide wire structure separates the functions of lesion penetration and structural support into different segments. The leading portion with small diameter handles penetration, while the main body with large diameter provides strength, eliminating the need to compromise either function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide wire combines two different diameter portions into a single integrated structure, where the leading portion and main body work together as a unified device. This merging allows the small-diameter leading portion to benefit from the structural support of the large-diameter main body.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If the guide wire structure is simplified, then the ease of manufacture is improved, but the lesion drilling capability deteriorates

Engineering Contradiction:

Improveease of manufactureVSAvoidlesion drilling capability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The guide wire is segmented into a leading portion and main body portion with distinct functions. This segmentation allows the complex drilling function to be concentrated in the leading portion while the main body maintains a simpler structure, balancing manufacturability with functionality.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250387600A1Medical device and method of manufacturing the same, and method of treatment

Publication Date: 2025.12.25 ASAHI INTECC CO LTD

AI summary

A medical device includes an elongated main body part and a leading portion connected to a distal end of the main body part. The leading portion has a first end portion located outward of an outer peripheral surface of the main body part.