Guide Catheter Engaging Portion for Stent Positioning

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Solution Overview

Problem

Existing stent delivery systems face challenges in accurately placing and positioning stents within hollow organs, as they often require complex procedures and specialized instruments, and struggle with precise control over stent placement, especially when the stent is positioned deeper than the target site.

Innovation Solution

A guide catheter with an engaging portion that protrudes from the head section, supported by a guide member for initial engagement and retractable to release the stent, allowing for precise placement and adjustment of the stent within the body using a pusher catheter and guide wire, facilitating accurate positioning without the need for additional instruments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional stent delivery system with suture and loop engagement is used, then the stent can be securely held and delivered, but the system requires multiple components (guide catheter, push catheter, suture, loop) increasing device complexity

Engineering Contradiction:

Improvestent secure holdingVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the suture and loop engagement mechanisms into an integrated engaging portion formed directly on the guide catheter. This merging eliminates the need for separate suture and loop components while maintaining the secure holding function through the engaging portion that directly engages the stent.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The guide catheter is designed with multi-functionality by incorporating the engaging portion directly on it, allowing the guide catheter to perform both guidance and secure engagement functions simultaneously, reducing the need for additional specialized components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If the guide catheter is retracted to release the stent, then the stent can be deployed, but precise control over placement position becomes difficult especially when stent is placed deeper than target

Engineering Contradiction:

Improvestent deploymentVSAvoidstent placement position

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by allowing the guide catheter to be retracted partially before complete stent deployment, enabling the operator to adjust the stent position to the desired location before final release and deployment, thus achieving precise placement control.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The engaging portion is designed to dynamically transition from an engaged state (when guide catheter is inserted) to a released state (when guide catheter is retracted), allowing controlled adjustment of stent position during the transition phase for precise placement.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If additional instruments are used to adjust stent position, then precise placement can be achieved, but the procedure becomes more complex and time-consuming

Engineering Contradiction:

Improvestent placement accuracyVSAvoidnumber of instruments

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Reliability

If the engaging portion is always engaged with the stent, then the stent is securely held, but the stent cannot be released for deployment

Engineering Contradiction:

Improvestent secure holdingVSAvoidstent release

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8133265B2Guide catheter, and stent delivery system

Publication Date: 2012.03.13 OLYMPUS CORPORATION(JP)

AI summary

This stent delivery system includes: a guide catheter inserted inside a stent, and inserted into the interior of the living body with the stent by a guide member inserted inside the guide catheter; a guide member inserted inside the guide catheter, and which guides the guide catheter and the stent to the interior of a living body; a pusher catheter inserted into the interior of the living body with the guide catheter in a state where the guide catheter is inserted inside the pusher catheter, and which pushes the stent along the guide catheter; and an engaging portion disposed on a head section of the guide catheter protruding from the stent, which engages with the stent in a state where the guide member is inserted into the head section, and which releases the stent in a state where the guide member is retracted away from the head section.