Covered Stent Anchoring System for Migration Control
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Solution Overview
Problem
Stent migration from its initial implantation site is undesirable due to lack of effective anchoring mechanisms in existing stent designs, leading to potential complications such as granulation tissue formation and luminal occlusion.
Innovation Solution
A stent design featuring a plurality of circumferential bands, linking members, and anchors that protrude from the outer surface upon deployment, creating an anchor gap for tissue ingrowth and anchoring, thereby reducing migration and occlusion risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stent is implanted without anchoring mechanisms, then the implantation process is simple, but the stent migrates from its initial site
Solution Approach 1:
The stent is divided into multiple circumferential bands (first, second, and third bands) with distinct functions. The first band contains anchors for tissue engagement, the second band provides the lumen opening, and the third band includes additional anchors. This segmentation allows each band to be optimized for its specific purpose while working together to prevent migration.
Solution Approach 2:
The anchors are pre-formed as integral parts of the circumferential bands during stent manufacturing. The first and third bands are configured with anchors that will engage tissue upon deployment, eliminating the need for separate anchoring steps during implantation. This preliminary preparation maintains implantation simplicity while ensuring stable positioning.
2Stability of the object's composition
If anchors are added to prevent stent migration, then stent stability improves, but device complexity increases
Solution Approach 1:
The anchors are merged with the circumferential bands as integral structures rather than separate components. The first circumferential band and third circumferential band each incorporate anchors directly into their structure, eliminating the need for separate anchoring devices and reducing overall system complexity while maintaining effective migration prevention.
Solution Approach 2:
The circumferential bands serve multiple functions: they provide structural support for the stent, create the lumen opening, and incorporate anchors for tissue engagement. This multi-functionality reduces the need for additional separate components, maintaining device simplicity while achieving stable positioning.
3Stability of the object's composition
If anchors protrude from the stent surface, then tissue ingrowth is promoted, but granulation tissue formation increases
Solution Approach 1:
The anchors are strategically positioned at specific locations on the first and third circumferential bands where tissue engagement is most effective. The anchors protrude locally from the stent surface at discrete points rather than across the entire surface, allowing controlled tissue ingrowth at anchor sites while minimizing unnecessary tissue irritation and granulation formation in other areas.
Data Source
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AI summary
A prosthesis that includes a stent comprising a plurality of circumferential bands, a plurality of linking members, at least one anchor, or a prosthesis that includes a stent comprising at least one anchoring section comprising a first circumferential band, a second circumferential band, and at least one anchor. Optionally, the prosthesis further includes at least one cover.