Stent Graft Internal Constraining Patch for Device Path Control

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Solution Overview

Problem

During the deployment of endoluminal stent grafts, there is a risk of unintended contact between medical devices and secondary stent graft pieces, leading to potential damage and complications.

Innovation Solution

A constraining patch is integrated into the stent graft assembly, which can be temporarily extended to hold medical instruments against the interior surface, preventing unwanted contact with secondary stent graft pieces by creating a passageway that can be either open for device passage or closed to restrict movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a secondary stent graft piece is deployed within the main stent graft piece, then the stent graft assembly can be formed in stages, but further movement of medical devices through the stent graft may result in unintended contact between the device and the deployed secondary pieces

Engineering Contradiction:

Improvestaged deployment capabilityVSAvoidunintended contact between device and secondary pieces

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

A constraining patch is introduced as an intermediary element between the medical device and the secondary stent graft pieces. This patch temporarily constrains the device within a defined passageway, preventing unintended contact with secondary structures while allowing the device to pass through the stent graft assembly during staged deployment procedures

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple cannulations of the main stent graft lumen are performed for staged deployment, then modular stent graft pieces can be deployed in stages, but the complexity of the deployment procedure increases

Engineering Contradiction:

Improvemodular staged deploymentVSAvoiddeployment procedure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The constraining patch serves as a guide and protective intermediary that simplifies the staged deployment process. By defining a clear passageway and constraining the device path, it reduces the complexity of navigating through previously deployed secondary pieces, making modular deployment more manageable despite requiring multiple cannulations

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the constraining patch is extended to hold medical instruments, then the path of medical devices can be controlled, but the patch occupies space within the main lumen

Engineering Contradiction:

Improvedevice path controlVSAvoidpatch volume in main lumen

Core Design Contradiction:

Ease of operationVSVolume of stationary object

Solution Approach 1:

The constraining patch is implemented as a thin, flexible membrane structure that can be attached to the inner surface of the main lumen. This thin-film approach provides effective device path control and constraint functionality while occupying minimal space within the main lumen, allowing sufficient room for medical device passage

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS10327935B2Stent graft with internal constraining mechanism

Publication Date: 2019.06.25 COOK MEDICAL TECHNOLOGIES LLC

AI summary

A stent graft assembly having a tubular body and a constraining patch attached to the interior surface of the tubular body. The constraining patch delineates a small passageway close to the inner surface of the tubular body. A cannula may extend through the passageway.