Bifurcation Stent Alignment via Interdigitating Axial and Lateral Elements
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Solution Overview
Problem
Conventional stent technologies face challenges in effectively treating bifurcated vessels due to difficulties in aligning side branch and main branch stents, leading to issues like in-stent restenosis, plaque shifting, and limited accessibility for drug delivery, especially at vessel bifurcations.
Innovation Solution
A system comprising two radially expandable stents with interdigitating axial and lateral elements, allowing for precise alignment and simultaneous expansion to ensure uniform scaffolding around bifurcations, along with a catheter system that includes radiopaque markers for alignment and a therapeutic agent for localized drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stents are used in bifurcated vessels, then the stent can provide basic scaffolding support, but alignment between side branch and main branch stents becomes difficult, leading to restenosis and plaque shifting
Solution Approach 1:
The stent is divided into multiple functional segments: a main body portion for the main branch and a side branch portion with lateral elements extending perpendicular to the main branch. This segmentation allows independent optimization of each portion for its specific function while maintaining overall alignment accuracy.
Solution Approach 2:
The stent employs asymmetric strut configurations where axial elements in the main branch differ from lateral elements in the side branch. The lateral elements extend perpendicular to the main branch axis, creating an asymmetric structure that naturally guides alignment at the bifurcation point while maintaining structural integrity.
2Reliability
If stent cell structure size is minimized to promote coverage and support vessel wall, then tissue prolapse is prevented, but accessibility for blood flow and future daughter stents to daughter vessels is reduced
Solution Approach 1:
Different regions of the stent have different cell structure characteristics. The main branch portion has smaller cells for optimal vessel wall support, while the side branch ostium region has larger cells that facilitate daughter stent delivery and maintain blood flow accessibility. This local variation in cell size optimizes both support and accessibility functions.
Solution Approach 2:
The stent incorporates lateral elements that extend in a direction perpendicular to the main branch axis, creating a three-dimensional scaffolding structure. This dimensional approach allows the stent to provide comprehensive radial support while maintaining open pathways in the longitudinal direction for future daughter stent delivery.
3Manufacturing precision
If conventional stent delivery systems are used, then basic stent deployment is possible, but precise alignment and simultaneous expansion at bifurcations cannot be achieved
Solution Approach 1:
The delivery system merges the main branch stent and side branch stent into a single integrated catheter assembly with a common inflation system. This allows simultaneous expansion of both stent portions through a single inflation action, ensuring precise alignment at the bifurcation point while simplifying the deployment procedure.
Solution Approach 2:
The system replaces complex mechanical alignment mechanisms with a unified balloon expansion system. By using a single inflation lumen that distributes pressure to both stent portions simultaneously, the system achieves precise alignment through controlled expansion rather than complex mechanical positioning mechanisms.
Data Source
AI summary
A system for treating a bifurcation includes a first radially expandable stent and a second radially expandable stent. The first stent has a side hole and a plurality of lateral elements extending from the side hole. The second stent has a plurality of axial elements extending away from the proximal end of the second stent. The axial elements of the second stent interdigitate with the lateral elements of the first stent when both stents have been expanded.