Bifurcated Stent Graft Deployment System with Variable Core
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current medical device deployment systems face challenges in accommodating complex deployment modes, such as steering and multiple stage deployment, while maintaining ease of use and reducing delivery mechanism profiles for treating aortic diseases effectively.
Innovation Solution
A deployment system for bifurcated stent grafts comprising a sheath with a tubular wall and a core member with varying diameters, which constrains the stent graft in a delivery configuration, providing enhanced column strength to prevent axial crumpling during deployment, and allows for controlled expansion and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional delivery system is used for bifurcated stent grafts, then the device can be delivered to the treatment site, but the system cannot accommodate complex deployment modes such as steering and multiple stage deployment
Solution Approach 1:
The delivery system is divided into distinct functional segments: a sheath for constraining the stent graft, a core member with varying diameters for structural support, and a delivery catheter for navigation. This segmentation allows each component to be optimized for specific functions while working together to enable complex deployment modes.
Solution Approach 2:
The core member features varying diameters along its length, creating dynamic structural properties that allow the system to adapt during deployment. The different diameter sections provide differential support and flexibility, enabling steering and multiple stage deployment while maintaining overall system control.
2Length of moving object
If the delivery mechanism profile is reduced for better vascular access, then ease of delivery is improved, but the system may lack sufficient structural support during deployment
Solution Approach 1:
The core member is nested within the sheath, with the core member's varying diameter sections providing internal structural support while the sheath provides external constraint. This nested configuration maximizes structural strength within a minimized profile, allowing the delivery mechanism to remain compact while maintaining adequate column strength during deployment.
3Volume of moving object
If the stent graft is constrained in a compact delivery configuration, then delivery profile is reduced, but the system may be prone to axial crumpling during deployment
Solution Approach 1:
The delivery system combines the sheath material and core member material to create a composite structural system. The sheath provides external constraint while the core member provides internal scaffolding, together forming a composite structure that resists axial crumpling while maintaining compact delivery configuration. The varying diameter sections of the core member provide differential rigidity to prevent buckling.
Data Source
AI summary
A system for endoluminal delivery of a medical device, wherein the medical device includes a bifurcated stent graft having a trunk, a first leg and a second leg shorter than the first leg. The system includes a sheath having a tubular wall having a cylindrical inner surface defining a lumen for receiving the stent graft therein to constrain the stent graft toward a delivery configuration suitable for endoluminal delivery, and a generally cylindrical core member extending through the lumen. The core member has a first annular surface for engaging an end of the first leg. The core has a second annular surface for engaging an end of the second leg while at least the end of the second leg remains constrained by the sheath.