Asymmetrical Sliding Guide Wire for Insertion and Stabilization

Solution Overview

Problem

Medical elongated bodies, such as guide wires, face challenges in balancing insertion properties and preventing unintentional movement within biological lumens, as existing low-sliding coatings compromise insertion ease.

Innovation Solution

A guide wire design featuring projection portions with asymmetrical sliding properties, allowing rotation to adjust between high and low sliding modes, facilitating insertion and stabilization within biological lumens.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a low-sliding portion is provided on the surface of a guide wire to prevent unintentional sliding at a target site, then the guide wire can be restrained from moving unintentionally, but the insertion properties of the guide wire deteriorate

Engineering Contradiction:

Improvestability at target siteVSAvoidinsertion properties

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The guide wire surface is segmented into multiple circumferential portions with different sliding properties. Specifically, the surface is divided into a first circumferential portion with high sliding properties and a second circumferential portion with low sliding properties, allowing different functional zones to coexist on the same guide wire structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the guide wire surface are assigned different sliding characteristics tailored to specific functional requirements. The high-sliding portion facilitates insertion by reducing friction with the biological lumen, while the low-sliding portion prevents unintentional movement at the target site, optimizing performance locally rather than uniformly across the entire surface.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If a surface coating is applied to enhance sliding properties for easier insertion, then insertion properties are improved, but the guide wire cannot be restrained from unintentionally moving at the target site

Engineering Contradiction:

Improveinsertion propertiesVSAvoidstability at target site

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The guide wire surface is segmented into multiple circumferential portions with different sliding properties. Specifically, the surface is divided into a first circumferential portion with high sliding properties and a second circumferential portion with low sliding properties, allowing different functional zones to coexist on the same guide wire structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the guide wire surface are assigned different sliding characteristics tailored to specific functional requirements. The high-sliding portion facilitates insertion by reducing friction with the biological lumen, while the low-sliding portion prevents unintentional movement at the target site, optimizing performance locally rather than uniformly across the entire surface.

Inventive Principle:

Principle #3Local quality

3Device complexity

If the entire surface of the guide wire is made to have uniform sliding properties, then the design is simple, but it cannot simultaneously achieve both easy insertion and prevention of unintentional movement

Engineering Contradiction:

Improvesurface design complexityVSAvoidfunctional adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The guide wire surface is segmented into multiple circumferential portions with different sliding properties. Specifically, the surface is divided into a first circumferential portion with high sliding properties and a second circumferential portion with low sliding properties, allowing different functional zones to coexist on the same guide wire structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the guide wire surface are assigned different sliding characteristics tailored to specific functional requirements. The high-sliding portion facilitates insertion by reducing friction with the biological lumen, while the low-sliding portion prevents unintentional movement at the target site, optimizing performance locally rather than uniformly across the entire surface.

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

Enables effective insertion and stabilization of medical elongated bodies by selectively altering sliding properties, enhancing both insertion ease and prevention of unintended movement.

Implementation Method 1

One surface of the projection portion in a circumferential direction has higher sliding properties than the other surface of the projection portion in the circumferential direction

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11045624B2Medical elongated body

Publication Date: 2021.06.29 TERUMO KK

AI summary

Provided is an improved medical elongated body which can be inserted into a biological lumen and can be restrained from unintentionally moving at a target site inside the biological lumen. The medical elongated body includes a main body portion that extends in an axial direction, and a projection portion that protrudes radially outward on an outer circumference of the main body portion and extends in the axial direction. One surface of the projection portion in a circumferential direction has higher sliding properties than an other surface of the projection portion in the circumferential direction.