Stent Delivery Guide Catheter Grip Piece Expulsion

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Solution Overview

Problem

Conventional stent delivery systems face challenges in easily expelling the grip piece into the duodenum while confirming the duodenal papilla using an endoscope, often requiring the endoscope to be pulled back towards the stomach, leading to increased procedure steps and duration due to potential interference and visibility issues.

Innovation Solution

A stent delivery system with a flexible long pusher catheter and a guide catheter that allows the grip piece to be extended and easily expelled into the duodenum without retracting the endoscope, using a method that involves separating the stent main body and pusher catheter while maintaining the grip piece inside the pusher catheter, and then releasing it using the guide catheter to ensure accurate positioning and visualization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the endoscope is pulled back from the duodenum toward the stomach to expel the grip piece, then the grip piece can be expelled from the catheter, but interference occurs between the endoscope channel and the grip piece, creating a risk of catching

Engineering Contradiction:

Improvegrip piece expulsionVSAvoidprocedure safety

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system separates the grip piece expulsion function from the endoscope manipulation. The guide catheter is designed to independently push the grip piece out through its own lumen, while the endoscope remains stationary in the duodenum. This segmentation eliminates the interference between endoscope channel and grip piece that occurs in conventional systems.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide catheter serves as an intermediary device between the stent delivery system and the grip piece. It provides a dedicated pathway for grip piece expulsion that does not involve the endoscope channel, thereby preventing the catching risk while enabling smooth grip piece deployment into the duodenum.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the endoscope is pulled back toward the stomach, then the grip piece can be expelled, but the papilla disappears from the field of view, making it difficult to confirm grip piece positioning

Engineering Contradiction:

Improvegrip piece expulsionVSAvoidpapilla visualization

Core Design Contradiction:

Ease of operationVSDifficulty of detecting and measuring

Solution Approach 1:

The system divides the visualization and expulsion functions into separate operational domains. The endoscope remains stationary in the duodenum maintaining continuous papilla visualization, while the guide catheter independently handles grip piece expulsion. This eliminates the need to pull back the endoscope and lose papilla from view.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide catheter acts as an intermediary that enables grip piece expulsion without requiring endoscope repositioning. By providing a separate expulsion pathway through the guide catheter's lumen, the system allows grip piece deployment while maintaining endoscopic visualization of the papilla throughout the procedure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If the endoscope must be reinserted into the duodenum to recheck the papilla, then grip piece positioning can be confirmed, but the procedure steps and duration increase

Engineering Contradiction:

Improvegrip piece positioning confirmationVSAvoidprocedure duration

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The endoscope maintains continuous positioning in the duodenum throughout the entire grip piece expulsion process, providing uninterrupted visualization of the papilla. This eliminates the need for endoscope withdrawal and reinsertion, maintaining continuous monitoring capability and reducing procedure time while ensuring accurate grip piece positioning confirmation.

Inventive Principle:

Principle #20Continuity of useful action

4Adaptability or versatility

If a narrow and long grip piece is attached to facilitate percutaneous endoscopic recovery, then the stent can be retrieved, but the grip piece cannot be easily expelled without pulling the endoscope back

Engineering Contradiction:

Improvestent retrieval capabilityVSAvoidgrip piece expulsion

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The guide catheter serves as an intermediary expulsion mechanism that accommodates the narrow and long grip piece design. By providing a dedicated lumen within the guide catheter, the system enables smooth expulsion of the grip piece into the duodenum without requiring endoscope manipulation, thus preserving the retrieval capability while simplifying the expulsion operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8298276B2Stent delivery system, stent placement method, and stent attachment method

Publication Date: 2012.10.30 OLYMPUS CORPORATION(JP)

AI summary

A stent delivery system which is inserted into an endoscope and is for placing a stent inside a body cavity, this stent delivery system being provided with a long pusher catheter which is flexible; a guide catheter which can pass through the lumen of the pusher catheter in a freely advancing and retracting manner; and a stent which is disposed to the front end of the pusher catheter, and has a cylindrical stent main body into which the guide catheter can be inserted, and a grip piece that is attached so as to extend from the main body and consists of a long narrow member that is pliable and can be disposed in the space between the guide catheter when it is inserted into the lumen of the pusher catheter.