Single Guide Wire Stent Graft Delivery Device for Branch Vessel Cannulation
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Solution Overview
Problem
Current stent graft delivery devices face challenges in efficiently delivering and deploying stent grafts in vessels, particularly when dealing with descending thoracic aortic aneurysms and dissections, where creating a seal with branch vessels is necessary, often requiring complex procedures and multiple guide wires.
Innovation Solution
A stent graft delivery device pre-loaded with a single guide wire that facilitates both delivery to the desired vessel location and cannulation of branch vessels, featuring a nose cone dilator with a straight and angled internal lumen configuration, allowing for simultaneous tracking and cannulation using a single guide wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple guide wires are used for tracking and cannulation, then the ability to deliver stent grafts to desired locations and cannulate branch vessels is improved, but the device complexity and procedural difficulty increase
Solution Approach 1:
The guide wire is designed with a multi-functional capability to serve both as a tracking element for delivering the stent graft to the desired location in the main vessel and as a cannulation element for accessing branch vessels. The guide wire includes a distal tip that can be manipulated to exit through fenestrations in the stent graft and enter branch vessels, eliminating the need for separate guide wires for these functions.
Solution Approach 2:
The patent combines the functions of multiple guide wires (tracking wire and cannulation wire) into a single integrated guide wire system. The guide wire structure merges the tracking function and cannulation function into one component, reducing device complexity while maintaining the ability to perform both functions effectively.
2Adaptability or versatility
If complex procedures with multiple components are used, then complete delivery and cannulation can be achieved, but procedural time and operational complexity increase
Solution Approach 1:
The guide wire is pre-configured with its distal tip positioned to facilitate both tracking and subsequent cannulation actions. The nose cone dilator is pre-loaded with the guide wire in a configuration that enables immediate tracking upon insertion, and the guide wire's distal tip is positioned to allow easy manipulation for cannulating branch vessels without requiring additional setup steps.
Solution Approach 2:
The single guide wire performs multiple functions sequentially: first as a tracking wire for delivering the stent graft, then as a cannulation wire for accessing branch vessels. This multi-functionality eliminates the need for separate procedural steps involving multiple guide wires, thereby reducing procedural time while maintaining complete delivery and cannulation capability.
3Device complexity
If a single guide wire is used for both tracking and cannulation, then device complexity is reduced, but the reliability of maintaining patency in both main and branch vessels may be compromised
Solution Approach 1:
The guide wire is designed with dynamic flexibility, allowing its distal tip to be manipulated into different positions and configurations. The guide wire can be advanced, repositioned, and shaped to exit through fenestrations and enter branch vessels while maintaining its primary tracking function. This dynamic capability ensures reliable patency maintenance in both main and branch vessels despite using a single wire.
Solution Approach 2:
The guide wire structure can be conceptually segmented into functional zones: a proximal section for tracking and manipulation, and a distal tip section for cannulation. This segmentation allows each portion to perform its specific function optimally while remaining part of a single integrated wire, ensuring reliable patency in both main and branch vessels.
Data Source
AI summary
A stent graft delivery device that is pre-loaded with a single guide wire for both tracking the device within a main vessel as well as for cannulating one or more branch vessels is described. The delivery device comprises a delivery catheter having a prosthesis releasably secured thereto and a nose cone extending from the proximal end of the catheter. In a delivery configuration, a secondary catheter is coaxial with the guide wire and extends through at least a portion of the prosthesis lumen and is held within a channel formed in the nose cone. In a released configuration, secondary catheter and guide wire are retracted distally out of the channel formed in the sidewall of the nose cone dilator and can be manipulated for cannulating a branch vessel.