Guide Catheter Stent Protection Section Design

Solution Overview

Problem

The existing stent indwelling devices face challenges in guiding a tube stent through severely bent portions with large curvature without causing the lumen to be crushed, as a guide catheter that is too soft may deform the tube stent, while a guide catheter that is too hard cannot easily pass through the treatment tool channel or raising base.

Innovation Solution

A stent indwelling device comprising a guide catheter with a core section, an outer layer section, and a stent protection section, where the stent protection section is formed in an annular shape with a spiral structure, providing stiffness and flexibility to resist compression and maintain the lumen's shape during curvature, and a stopper to restrict movement and prevent crushing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the guide catheter is made too soft to pass through bent portions, then the catheter can navigate curved paths, but the tube stent may be plastically deformed and the lumen may be crushed

Engineering Contradiction:

Improveability to pass through bent portionsVSAvoidprotection of tube stent from deformation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The guide catheter is divided into three functional sections: a core section (3) providing structural support, an outer layer section (6) providing flexibility, and a stent protection section (8) positioned between them to prevent lumen collapse. This segmentation allows different parts of the catheter to perform specialized functions that collectively resolve the contradiction between flexibility and support.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide catheter employs a composite structure combining multiple materials with different properties: the core section uses a supportive material, the outer layer uses a flexible material, and the stent protection section uses a material with intermediate properties that resist compression while allowing curvature. This composite approach enables the catheter to simultaneously achieve softness for navigation and stiffness for protection.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the guide catheter is made too hard to protect the tube stent, then the stent is protected from deformation, but the catheter cannot easily pass through the treatment tool channel or raising base

Engineering Contradiction:

Improveprotection of tube stent from deformationVSAvoidability to pass through treatment tool channel

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The guide catheter is divided into three functional sections: a core section (3) providing structural support, an outer layer section (6) providing flexibility, and a stent protection section (8) positioned between them to prevent lumen collapse. This segmentation allows different parts of the catheter to perform specialized functions that collectively resolve the contradiction between flexibility and support.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide catheter employs a composite structure combining multiple materials with different properties: the core section uses a supportive material, the outer layer uses a flexible material, and the stent protection section uses a material with intermediate properties that resist compression while allowing curvature. This composite approach enables the catheter to simultaneously achieve softness for navigation and stiffness for protection.

Inventive Principle:

Principle #40Composite materials

3Reliability

If a flexible tube stent is used to reduce closing probability, then the stent can maintain lumen patency, but the stent requires a guide catheter with specific mechanical properties that is difficult to construct

Engineering Contradiction:

Improvelumen patency maintenanceVSAvoidguide catheter structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The guide catheter is divided into three functional sections: a core section (3) providing structural support, an outer layer section (6) providing flexibility, and a stent protection section (8) positioned between them to prevent lumen collapse. This segmentation allows different parts of the catheter to perform specialized functions that collectively resolve the contradiction between flexibility and support.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide catheter employs a composite structure combining multiple materials with different properties: the core section uses a supportive material, the outer layer uses a flexible material, and the stent protection section uses a material with intermediate properties that resist compression while allowing curvature. This composite approach enables the catheter to simultaneously achieve softness for navigation and stiffness for protection.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3009108B1Stent placement device

Publication Date: 2019.06.05 OLYMPUS CORPORATION(JP)

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AI summary

A stent indwelling device includes a guide catheter and a pusher catheter. The guide catheter includes: a core section; an outer layer section surrounding an outer circumference of the core section; a stent protection section disposed between the core section and the outer layer section, being longer than a dimension of a tube stent, having stiffness resisting compression inward in a radial direction perpendicular to a longitudinal axis of the guide catheter, and having flexibility in a direction in which the guide catheter is curved; and a stopper configured to allow expansion of the stent protection section in a direction along the longitudinal axis and restrict movement of the stent protection section in the direction with respect to the core section.