Stent-Graft Ring for Tip Capture and Closed Web Deployment
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Solution Overview
Problem
Stent-grafts with closed web proximal configurations face challenges during deployment due to the lack of a bare proximal end stent for interaction with tip capture mechanisms, leading to difficulties in achieving control and accuracy, especially in sensitive tissue treatments.
Innovation Solution
A stent-graft design featuring a ring woven between adjacent endmost crowns that transforms into attachment loops to couple with tip capture fingers, allowing for initial deployment control while maintaining a closed web configuration post-deployment, utilizing a strand of material that forms a circular band and alternates between the inside and outside surfaces of the graft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a closed web proximal configuration is used, then the prosthesis provides a smooth surface and reduces tissue trauma, but the stent-graft cannot interact with tip capture mechanisms for precise positioning
Solution Approach 1:
The ring is divided into multiple discrete sections that can independently engage with tip capture fingers. This segmentation allows the prosthesis to maintain a closed web configuration while providing discrete interaction points for positioning control during deployment.
Solution Approach 2:
The ring acts as an intermediary element between the closed web stent-graft and the tip capture mechanism. It provides the necessary interaction interface without requiring the stent-graft itself to have an open web configuration, thus mediating between the conflicting requirements of tissue protection and positioning control.
2Ease of operation
If the ring sections extend beyond the graft, then tip capture control is enabled, but the prosthesis structure becomes more complex
Solution Approach 1:
The ring serves multiple functions simultaneously: it provides structural support to the closed web configuration, enables tip capture interaction through its sections, and maintains the integrity of the prosthesis. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The ring is integrated with the closed web stent-graft structure, merging the positioning control function with the existing prosthesis framework. This integration avoids adding separate complex positioning mechanisms while still enabling precise deployment control through tip capture interaction.
3Ease of operation
If the ring is formed to engage endmost crowns, then tip capture interaction is possible, but manufacturing precision requirements increase
Solution Approach 1:
The ring sections are strategically positioned at specific locations around the stent-graft where they can effectively engage with tip capture fingers. This localized placement optimizes the engagement capability while minimizing the overall complexity and manufacturing precision requirements across the entire prosthesis structure.
Data Source
AI summary
A stent-graft has a closed web end configuration in which endmost stent crowns do not extend beyond an end or edge of a tubular graft. In order to couple the stent-graft to tip capture fingers or prongs of a delivery system, the stent-graft includes a ring woven between the endmost crowns of an end stent. When end stent is in a compressed delivery configuration, sections of the ring between adjacent endmost crowns form attachment loops that longitudinally extend beyond the end of the tubular graft for engaging the tip capture fingers of a delivery system. When the end stent is in an expanded fully deployed configuration, the attachment loops retract back to the stent so that the ring is a circular band having a diameter substantially equal to the expanded diameter of the stent.