Pre-loaded Endovascular Delivery Device with Extension Sheath
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Solution Overview
Problem
Current endovascular stent graft delivery devices face challenges in accessing and deploying stent grafts into branched and blind vessels, such as the internal iliac artery, due to the lack of minimally invasive methods and the need for complex procedures like snaring and pulling guide wires across the aortic bifurcation.
Innovation Solution
A pre-loaded delivery device comprising an inner cannula, nose cone dilator, extension cannula, and main sheath, which allows for the deployment of a stent graft into the common iliac artery with a side branch extending into the internal iliac artery, eliminating the need for snaring a guide wire and enabling easier access through a low-profile delivery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional delivery device is used to access the internal iliac artery, then the procedure requires snaring and pulling a guide wire across the aortic bifurcation, but this increases procedural complexity and difficulty of access
Solution Approach 1:
The delivery device is pre-loaded with a guide wire extending through the extension sheath and main sheath before the procedure begins. This preliminary configuration eliminates the need to snare and pull the guide wire across the aortic bifurcation during the procedure, directly reducing procedural complexity while maintaining ease of access to the internal iliac artery
2Volume of moving object
If a low-profile delivery device is used, then the device size is reduced for better accessibility, but the ability to deliver stent grafts into branched vessels is limited
Solution Approach 1:
The delivery device is segmented into multiple functional components: an inner cannula, extension cannula, extension sheath, and main sheath. This segmentation allows the device to maintain a low-profile configuration for accessibility while enabling delivery of stent grafts into branched vessels through the coordinated function of separate components, particularly the extension sheath that reaches into the internal iliac artery
3Ease of operation
If an extension sheath is added to the delivery device, then access to blind vessels like the internal iliac artery is improved, but the device complexity increases
Solution Approach 1:
The extension sheath is nested within the main sheath, and both are pre-loaded with the guide wire. This nested configuration allows the extension sheath to reach into blind vessels like the internal iliac artery while remaining contained within the main delivery system, improving access capability without proportionally increasing overall device complexity
Data Source
AI summary
Methods for delivering and deploying an endovascular graft to the common and internal iliac arteries are described. A system including a pre-loaded delivery device with a releasably attached extension cannula and an extension sheath for use with such methods is also described.