Pusher Extension Dilator for Internal Iliac Artery Cannulation
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Solution Overview
Problem
Current endovascular prosthesis delivery devices face challenges in accessing and deploying stent grafts into the internal iliac artery, a blind vessel, due to the lack of minimally invasive methods, making it difficult to treat vascular defects in branched vessels like the common and internal iliac arteries.
Innovation Solution
A prosthesis delivery device comprising a pusher catheter with a pusher extension and an extension dilator that allows for the deployment of a stent graft into the common iliac artery and extension into the internal iliac artery, using a guide wire for cannulation and a retractable sheath to facilitate the placement of a side branch stent graft, enabling minimally invasive procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional prosthesis delivery device is used, then the device structure is simple, but it cannot access and deploy stent grafts into the internal iliac artery effectively
Solution Approach 1:
The delivery device is divided into multiple functional components: a pusher catheter for advancing the prosthesis, an extension dilator for accessing the internal iliac artery, and a guide catheter for navigation. This segmentation allows each component to perform its specific function effectively, enabling access to the blind internal iliac artery while maintaining manageable device complexity through modular design
Solution Approach 2:
The extension dilator is nested within the pusher catheter, and the guide catheter provides an outer pathway. This nested configuration allows multiple functions to be integrated in a compact manner, improving access capability without proportionally increasing the overall device complexity
2Ease of operation
If access to internal iliac artery is attempted without extension dilator, then the device structure is simple, but cannulation and tracking into position is difficult
Solution Approach 1:
The extension dilator serves as an intermediary tool that facilitates cannulation of the internal iliac artery and provides a tracking pathway for the guide catheter. This intermediary component simplifies the complex task of navigating into the blind vessel by providing a prepared pathway, improving ease of operation while adding only one additional component to the device structure
3Productivity
If a single guide wire is used, then the procedure is simpler, but tracking the device into position within the vessel is difficult
Solution Approach 1:
The extension dilator is advanced and positioned in the internal iliac artery before the main delivery system is introduced. This preliminary action creates a prepared pathway that facilitates subsequent tracking of the guide catheter and prosthesis delivery, improving deployment efficiency while making the tracking process easier through the pre-established pathway
Data Source
AI summary
A delivery device and methods for deploying an endovascular prosthesis within the common and internal iliac arteries are described. The device comprises a pusher catheter having a proximal end and a pusher extension extending proximally therefrom. A tubular prosthesis having a side branch is releasably coupled to the pusher extension. An extension dilator extends proximally from the proximal end of the pusher catheter, extends at least partially along an external surface of the main tubular body, into a distal end of the side branch and exits a proximal end of the tubular prosthesis. The extension dilator can be tracked over a guide wire which serves to both position the device within a vessel and also to facilitate cannulation of an internal iliac artery.