Bifurcation Stent With C-Shaped Abutting Sections
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Solution Overview
Problem
Stent implantation at bifurcations in blood vessels is challenging due to issues like restenosis, inflammation, and thrombosis, particularly because existing stents can cause narrowing of adjacent branches and disrupt blood flow, with a need for designs that minimize stent material in the main vessel's blood flow path.
Innovation Solution
A stent system comprising a first and second stent prosthesis with C-shaped and O-shaped body sections that abut to form a tubular scaffold, reducing stent material in the main vessel's blood flow path and minimizing turbulence, using self-expanding stents with a ball and socket connection for precise alignment and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stents are deployed at bifurcations to provide radial support, then the stent material extends across the main vessel interrupting blood flow, but this causes turbulent flow and increases risk of thrombosis and restenosis
Solution Approach 1:
The stent is divided into multiple modular segments including a main body stent and one or more side branch stents that can be selectively deployed. This segmentation allows the stent material to be distributed along the vessel path rather than concentrated at the bifurcation point, reducing interruption of blood flow in the main vessel while still providing necessary radial support at the bifurcation.
Solution Approach 2:
A delivery catheter system acts as an intermediary to precisely position and deploy the stent segments. The catheter guides the stent through the bifurcation and enables controlled deployment at the target site, ensuring proper positioning without requiring excessive stent material in the main vessel flow path.
2Reliability
If multiple stents are deployed simultaneously in branch vessels to dilate all vessels, then complete coverage is achieved, but the complexity of the procedure and amount of stent material increase
Solution Approach 1:
The stent system employs dynamic, selective deployment where side branch stents can be deployed independently based on the specific clinical needs of each branch vessel. This dynamic approach allows the operator to deploy only the necessary stent segments rather than requiring all stents to be deployed simultaneously, reducing overall procedure complexity and stent material usage while maintaining complete coverage where needed.
3Reliability
If abutting stents are deployed in each branch vessel, then bifurcation support is provided, but stent material extends across the middle of the main vessel interrupting blood flow
Solution Approach 1:
The stent design transitions from a two-dimensional planar abutting configuration to a three-dimensional articulated structure where side branch stents extend perpendicular to the main vessel axis. This dimensional change allows the stent material to follow the natural three-dimensional path of the bifurcating vessels rather than extending across the main vessel, providing bifurcation support while preserving blood flow in the main vessel.
Data Source
AI summary
A bifurcation stent system includes a pair of self-expanding stents. Each stent has a C-shaped body section having a generally semicircular cross-section along its length and an O-shaped body section having a circular cross-section along its length. The stents are deployed in vivo such that the edges of the C-shaped body sections abut each other to form a tubular scaffold in a Y-shaped formation that conforms to the bifurcation. In order to connect the stents in vivo, the C-shaped body sections are configured to include a ball and socket connection there between. The C-shaped body sections align and abut to form a tubular scaffold that extends in the main vessel of the bifurcation, while the O-shaped body sections are tubular scaffolds that extend into the respective branch legs of the bifurcation.