Stent Mesh with S-Shaped Webs for Radial Force
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Solution Overview
Problem
Current stent technologies face challenges in treating arteriosclerotic intracranial arterial stenosis due to the need for separate balloon catheters and stent delivery catheters, which complicate procedures and increase risks, especially in small blood vessels, where stents with high radial force and small compressed diameters are required but have not been effectively utilized.
Innovation Solution
A stent with a compressible and expandable mesh structure featuring interconnected web connectors forming rhomboid cells, allowing for a high radial force while maintaining a small compressed diameter, combined with a treatment system that includes a catheter with multiple working channels and a balloon for simultaneous dilation and stent delivery, reducing the need for additional steps and enhancing navigation through small vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If stents are compressed to a very small cross-sectional diameter for navigation through small blood vessels, then the delivery profile is reduced, but the radial force decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the mesh structure geometry, specifically setting the web height between 0.05mm and 0.09mm, and controlling the ratio between compressed and non-operational diameter between 1:7 and 1:12. These parameter optimizations enable the stent to achieve both small compressed diameter for navigation and sufficient radial force (at least 0.5N) for stenosis treatment.
Solution Approach 2:
The patent employs composite material principles by creating a mesh structure combining straight webs and S-shaped curved webs interconnected by web connectors. This composite structural design allows the stent to achieve high flexibility for navigation while maintaining high radial force through the specific geometric configuration of the mesh cells.
2Reliability
If separate balloon catheter and stent delivery catheter are used for treating stenosis, then the treatment can be performed, but the procedure becomes extremely complicated and time-consuming
Solution Approach 1:
The patent merges the balloon catheter and stent delivery catheter into a single integrated treatment system. The catheter includes both a balloon for dilation and a delivery channel for the stent, allowing both functions to be performed with one device. This reduces procedure complexity and surgery time while maintaining treatment effectiveness.
Solution Approach 2:
The treatment system achieves multi-functionality by enabling both balloon dilation and stent delivery through a single catheter. The catheter can first perform stenosis dilation using the balloon, then deliver and deploy the stent through the same device, eliminating the need for separate procedures and reducing overall complexity.
3Force
If stents with high radial force are used for treating stenosis, then the treatment effectiveness is improved, but the compressed diameter increases making navigation through small vessels difficult
Solution Approach 1:
The patent resolves this contradiction by precisely controlling geometric parameters: web height between 0.05mm and 0.09mm, and compressed-to-non-operational diameter ratio between 1:7 and 1:12. These parameter optimizations enable the stent to achieve high radial force (at least 0.5N) while maintaining small compressed diameter for successful navigation through small intracranial vessels.
Solution Approach 2:
The patent utilizes curved S-shaped webs in the mesh structure to improve flexibility and compressibility. The curved geometry allows the stent to be compressed to a small diameter for navigation while maintaining the structural integrity and radial force generation capability when deployed, as the curved elements can efficiently transmit radial expansion forces.
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 stent provides sufficient radial force for effective stenosis treatment while being flexible enough for navigation through small vessels, and the integrated treatment system reduces surgery time and patient risk by allowing for single-catheter procedures.
Implementation Method 1
a compressible and expandable mesh structure of webs which are interconnected by means of web connectors into one piece
Data Source
AI summary
The disclosure relates to a stent with a compressible and expandable mesh structure of webs which are interconnected by web connectors into one piece and define rhomboid cells, wherein each cell is defined by two straight webs and two S-shaped curved webs which connect the straight webs together, and wherein (i) in a non-operational state, the mesh structure has a fully expanded non-operational diameter Dexp which is between 3.0 mm and 5.0 mm, (ii) a ratio between a fully compressed diameter Dkomp of the mesh structure and the non-operational diameter Dexp of the mesh structure is between 1:7 and 1:12, and (iii) the webs have a web height, measured in a radial direction, which is at least 0.05 mm and at most 0.09 mm, so that the mesh structure has a radial force of at least 0.5 N, in particular at least 0.6 N, between the fully compressed diameter Dkomp and an operational diameter which is at most 90% of the non-operational diameter Dexp.