Internal Iliac Stent-Graft Delivery for Single-Site Preservation
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Solution Overview
Problem
Current treatments for iliac aneurysms require multiple access points and guidewires, complicating the process and potentially disrupting blood flow to nearby internal iliac arteries.
Innovation Solution
A deployable stent-graft system accessed from a single femoral artery site, allowing for self-expanding or balloon-expandable deployment to preserve blood flow through the internal iliac artery while excluding the aneurysm, using a modular design with slidable connections for easy navigation and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-inflatable devices or prostheses are used to treat iliac aneurysms, then the aneurysm can be excluded, but multiple access points and guidewires are required which complicates the treatment process and may disrupt blood flow to internal iliac arteries
Solution Approach 1:
The prosthesis is divided into modular segments including a main body and detachable iliac limb(s). The iliac limb can be selectively attached or detached to preserve blood flow to the internal iliac artery when needed, while still providing aneurysm exclusion when required. This segmentation allows the system to adapt between different treatment scenarios.
Solution Approach 2:
The system transitions from a static committed occlusion to a dynamic selective occlusion. The iliac limb can be attached to occlude the external iliac artery for aneurysm treatment, or detached to preserve flow through the internal iliac artery. This dynamic capability resolves the contradiction by allowing the same device to provide both aneurysm exclusion and blood flow preservation as needed.
2Ease of operation
If a single access site is used to deploy the stent-graft, then ease of access and simplified procedure is achieved, but precise positioning and navigation to the internal iliac artery requires enhanced steering and torque control
Solution Approach 1:
The delivery catheter incorporates enhanced steering capabilities at specific segments to navigate the complex vasculature. The catheter design includes features that provide localized control for navigating to the internal iliac artery ostium from the femoral access site, enabling precise positioning without requiring multiple access points.
3Reliability
If the stent-graft is designed to preserve pelvic perfusion through the internal iliac artery, then blood flow to the hypogastric artery is maintained, but the device must seal to healthy vessel portions while excluding aneurysmal segments
Solution Approach 1:
The delivery system is designed to position the stent-graft precisely before deployment. The catheter includes positioning features and the stent-graft is delivered in a compressed state that allows accurate alignment with the internal iliac artery ostium and healthy vessel portions, ensuring proper sealing before the device is expanded and activated.
Data Source
AI summary
A system for internal iliac preservation includes a catheter having a distal catheter portion and a proximal catheter portion; a first guidewire having a proximal portion extending from the proximal catheter portion, a distal portion and a medial portion disposed between the proximal portion and the distal portion; a first outer sheath slidably disposed over distal catheter portion; and an integrated second delivery system disposed within the outer sheath at the distal catheter portion. The integrated second delivery system includes a second guidewire; an expandable stent-graft disposed over a lumen of the second guidewire, and a slidable connector slidably disposed over the medial portion of the first guidewire, where the second guidewire is slidably engaged with the slidable connection to permit movement of the integrated second delivery system along the first guidewire when the first outer sheath is retracted from distal catheter portion.