Guide Wire Knuckle Advance Suppression

Solution Overview

Problem

During vascular treatments, guide wires often unintentionally migrate into microscopic blood vessels or cause dissociation or perforation of the blood vessel wall due to point contact, especially when advancing through main vessels without selecting a branching vessel.

Innovation Solution

A guide wire insertion method utilizing a guide wire with a knuckle advance suppressing structure, where the guide wire is inserted into a main vessel, a knuckle is formed at the distal end when caught by a side branch, and then the guide wire is advanced while maintaining the knuckle to prevent further knuckle advancement and reduce load on the blood vessel wall.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a guide wire with a shaped distal end is used and the distal end is operated to be pushed forward in a blood vessel, then the guide wire can be guided to the affected part, but the distal end may unintentionally migrate into a microscopic blood vessel or come into contact with the blood vessel wall causing dissociation or perforation

Engineering Contradiction:

Improveguidability to affected partVSAvoidmigration into microscopic blood vessel or blood vessel wall damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-forming a knuckle at the distal end portion of the guide wire before insertion into the blood vessel. This pre-formed knuckle acts as a safety mechanism that prevents the distal end from migrating into microscopic blood vessels or contacting the blood vessel wall during advancement, thereby resolving the contradiction between guidability and safety.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies preliminary anti-action by creating a knuckle structure that pre-counteracts the harmful migration tendency of the distal end. The knuckle's geometric configuration inherently resists further advancement into side branches or contact with vessel walls, providing built-in protection against the identified harmful effects while maintaining operational guidability.

Inventive Principle:

Principle #9Preliminary anti-action

2Productivity

If the distal end of the guide wire is pushed forward in a blood vessel, then the guide wire can reach the affected part, but the point contact of the distal end with the blood vessel wall increases the load applied to the blood vessel wall

Engineering Contradiction:

Improveability to reach affected partVSAvoidload on blood vessel wall

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

The patent applies preliminary action by pre-forming a knuckle at the distal end portion of the guide wire before insertion into the blood vessel. This pre-formed knuckle acts as a safety mechanism that prevents the distal end from migrating into microscopic blood vessels or contacting the blood vessel wall during advancement, thereby resolving the contradiction between guidability and safety.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies preliminary anti-action by creating a knuckle structure that pre-counteracts the harmful migration tendency of the distal end. The knuckle's geometric configuration inherently resists further advancement into side branches or contact with vessel walls, providing built-in protection against the identified harmful effects while maintaining operational guidability.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS20250195846A1Guide wire insertion method

Publication Date: 2025.06.19 ASAHI INTECC CO LTD

AI summary

A guide wire insertion method for inserting a guide wire into a blood vessel having a main vessel and a side branch branched from the main vessel. The method includes providing a guide wire having a knuckle advance suppressing structure; inserting the guide wire into a main vessel of a blood vessel of a patient and pushing a distal end of the guide wire toward an affected part; after the distal end of the guide wire is caught by a side branch of the blood vessel, generating a knuckle at a distal end portion of the guide wire, and removing the distal end of the guide wire from the side branch, and pushing the distal end portion toward the affected part in the main vessel while maintaining the knuckle.