Stent Deployment Retention Rod Hook Mechanism

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Solution Overview

Problem

Existing devices for deploying stents in blood circulation canals face reliability issues due to the risk of filamentary connections jamming or breaking during withdrawal, primarily because of their great length and winding path within the supports.

Innovation Solution

Incorporating a retention rod with a hook mechanism that tightens the clamping ring from its deployment to retracted configuration, reducing the risk of filamentary connections jamming by minimizing their length within the support and using guide passages and hooks to manage the clamping ring effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If filamentary connections are used to retain the endoprosthesis in the support, then the endoprosthesis can be maintained in retracted state and deployed reliably, but the filamentary connections become very long and winding which increases the risk of jamming or breaking during withdrawal

Engineering Contradiction:

Improvereliability of endoprosthesis deploymentVSAvoidlength of filamentary connections

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The invention divides the single long filamentary connection into multiple shorter filamentary connections, each retained by a separate retention rod with hook. This segmentation reduces the length of each individual connection, minimizing the winding path and risk of jamming or breaking during withdrawal while maintaining reliable endoprosthesis deployment through multiple retained connections

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the filamentary connections are withdrawn by sliding in the supports, then the connections can be removed from the patient's body, but the great length and winding path cause high risk of jamming or breaking

Engineering Contradiction:

Improveease of withdrawalVSAvoidrisk of jamming or breaking

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

By dividing the long filamentary connection into multiple shorter segments, each managed by a separate retention rod, the invention makes withdrawal easier and more reliable. Each shorter connection has reduced winding path and lower risk of jamming or breaking during the sliding withdrawal process

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The retention rod with hook acts as an intermediary mechanism that simplifies the withdrawal process. The hook engages with the loop of each filamentary connection, providing a controlled release mechanism that reduces the risk of jamming compared to direct sliding withdrawal of long connections

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9427317B2Device for treating a blood circulation canal and process for preparing this device

Publication Date: 2016.08.30 WL GORE & ASSOC INC

AI summary

This device includes a hollow support delimiting, in the vicinity of a distal end, a transverse retention opening. It further includes an endoprosthesis which can be deployed between a state retracted against the support and an expanded state. The device further includes a filamentary connection forming a clamping ring surrounding the endoprosthesis and forming a loop engaged in the support through the retention opening. A retention rod mounted to be movable in the support, and the retention rod has a hook for retaining the loop. The displacement of the retention rod from a release position to a retention position brings about the tightening of the clamping ring.