Self-Expandable Bifurcation Stent Delivery System
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Solution Overview
Problem
Current stent technologies face challenges in accurately positioning and securely implanting bifurcation stents in arterial bifurcations, particularly in coronary and carotid arteries, due to high risks of arterial wall damage, restenosis, and technical difficulties, with existing designs failing to provide full coverage and precise placement.
Innovation Solution
A self-expandable bifurcation stent with a constricted mesh made of shape-memory material, featuring an oblique design and strategically placed radioactive labels, combined with a double-channel delivery system using a polymeric tubular catheter and pushing wire, allows for precise adjustment and accurate positioning during implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional stents are used in bifurcated arteries, then stenting of the basic artery can be achieved, but full covering along the lateral branch is not provided and positioning accuracy is insufficient
Solution Approach 1:
The stent is divided into three distinct segments: a basic artery stenting segment, a lateral branch stenting segment, and a connecting segment. This segmentation allows each part to be optimized for its specific function, enabling complete coverage of both the basic artery and lateral branch while achieving precise positioning through the oblique orientation of the lateral branch segment
Solution Approach 2:
The stent employs an asymmetric oblique design where the lateral branch stenting segment is positioned at a 45-60 degree angle relative to the basic artery stenting segment. This asymmetric configuration matches the natural anatomy of bifurcated arteries and enables accurate positioning in the lateral branch ostium while maintaining complete coverage of both vascular segments
2Measurement precision
If radioactive labels are placed extremely close together on the stent, then orientation agents are provided, but accurate orientation is hampered
Solution Approach 1:
Radioactive labels are strategically positioned at specific locations on the stent rather than distributed uniformly. Labels are placed on the lateral branch stenting segment at positions that correspond to the oblique orientation, allowing accurate angular positioning (45-60 degrees) while maintaining simplicity in the labeling system
3Ease of operation
If a simple delivery system is used, then device complexity is reduced, but precise adjustment of stent position during implantation is not enabled
Solution Approach 1:
The delivery system incorporates a dynamic positioning mechanism that allows the stent to be adjusted to the precise location and orientation required. The system enables rotation and positioning of the stent at the lateral branch ostium before final deployment, achieving accurate placement (45-60 degree angle) while maintaining operational simplicity through a coordinated wire and catheter system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the accuracy and safety of stent placement in arterial bifurcations, reducing the risk of complications by enabling precise visualization and adjustment of the stent's position, thereby improving the reliability of endovascular procedures.
Implementation Method 1
a self-expandable bifurcation stent with a constricted mesh made of shape-memory material
Data Source
AI summary
Self-expandable bifurcation stent and systems for delivery and implantation of the self-expandable bifurcation stent, comprising a self-expandable bifurcation stent made of a material possessing shape memory, capable of shaping a mesh with cylindrical surface and marked by radioactive labels, and the delivery system for its implantation, comprising a polymeric tubular catheter with a cap at the distal end, a guiding wire and a pushing wire, where the tubular catheter is executed double-barreled, one lumen accommodating the guiding wire, and the second lumen accommodating the pushing wire with a cap at its distal end, which cap is executed in the shape of a polymeric elastic cap put over the tubular catheter accommodating, between the polymeric elastic cap and the tubular catheter, the stent in the first position with the reduced diameter, the cap is executed with the capability of distal 5 moving along the guiding wire and along the tubular catheter accommodating the stent, by means of the pushing wire, and with capability of unrolling the stent at the proximal end into the second position with greater diameter, and the capability of backwards proximal moving thus returning the stent to its first position in the tubular catheter.