Stent Delivery Holding Filament Repositioning

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Solution Overview

Problem

Conventional methods for delivering stents to the biliary or pancreatic tract require manipulation of the guide catheter to secure and release the stent, limiting repositioning and deployment flexibility.

Innovation Solution

A stent delivery system utilizing a holding filament that secures the stent to a push catheter, allowing independent release and repositioning without moving the guide catheter, featuring a suture or filament that wraps around anchors on the stent and extends to a control mechanism for securement and release.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional methods use guide catheter manipulation to secure and release stents, then stent delivery can be achieved, but repositioning and deployment flexibility is limited

Engineering Contradiction:

Improverepositioning and deployment flexibilityVSAvoidguide catheter manipulation complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The system separates the stent release function from the guide catheter by introducing an independent pusher member with a holding filament. The pusher member can be advanced or retracted independently to secure or release the stent without moving the guide catheter, enabling repositioning and redeployment while maintaining operational simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pusher member acts as an intermediary between the operator and the stent. By manipulating the pusher member rather than the guide catheter, the operator can secure and release the stent independently, providing flexibility to reposition the stent multiple times before final deployment

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the stent is secured to the guide catheter, then stent position is controlled, but independent release requires guide catheter movement

Engineering Contradiction:

Improvestent release independenceVSAvoiddelivery system structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The pusher member is nested within the guide catheter, with the holding filament extending through the guide catheter lumen. This nested configuration allows the pusher member to be advanced to secure the stent without removing or moving the guide catheter, enabling independent stent release while maintaining a compact delivery system

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The holding filament is pre-positioned through the guide catheter and attached to the stent before delivery. This preliminary configuration allows the pusher member to simply advance and engage the filament for securement, simplifying the release mechanism while maintaining system integrity

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11337836B2Rapid exchange stent delivery system

Publication Date: 2022.05.24 BOSTON SCIENTIFIC SCIMED INC

AI summary

Stent delivery systems and methods for making and using stent delivery systems are disclosed. An example stent delivery system may include a guide member having a proximal portion and a distal portion. A stent may be disposed about the distal portion of the guide member. The stent may have a wall having an opening formed therein. A pusher member may be disposed about the guide member and positioned proximal of the stent. A holding filament may be disposed at the opening and may extend to the proximal portion of the guide member. The holding filament may be configured to releasably secure the position of the stent relative to the pusher member. The holding filament may be releasable from the stent independently of movement of the guide member.