Flared GI Stent Structure for Migration-Resistant Anchoring
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Solution Overview
Problem
Implantable medical devices, such as stents, face challenges with migration due to peristalsis and the moist environment of the gastrointestinal tract, and covered stents are prone to further migration despite having a physical barrier to reduce tissue ingrowth.
Innovation Solution
The stent design includes a tubular scaffold with a flared section and a medial section of varying diameters, featuring a liner spaced from anchoring regions to promote tissue ingrowth at the flared section while minimizing ingrowth at the medial section, thereby enhancing anchoring within the gastrointestinal tract.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a covered stent is used to reduce tissue ingrowth, then the stent can be removed or repositioned more easily, but the stent becomes more prone to migration
Solution Approach 1:
The stent is divided into distinct sections with different properties: a covered section for easy removal and a bare metal anchoring section for migration resistance. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the stent have different characteristics - the covered section provides ease of removal while the bare metal anchoring region provides migration resistance. This local differentiation resolves the contradiction by assigning specific functions to specific locations.
2Reliability
If bare metal portions are exposed to promote tissue ingrowth, then stent migration is reduced, but the stent becomes more difficult to remove or reposition
Solution Approach 1:
The stent is divided into distinct sections with different properties: a covered section for easy removal and a bare metal anchoring section for migration resistance. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the stent have different characteristics - the covered section provides ease of removal while the bare metal anchoring region provides migration resistance. This local differentiation resolves the contradiction by assigning specific functions to specific locations.
3Ease of operation
If the stent is designed with compressible and flexible properties for positioning, then stent positioning is facilitated, but stent migration increases due to peristalsis
Solution Approach 1:
The stent is divided into distinct sections with different properties: a covered section for easy removal and a bare metal anchoring section for migration resistance. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the stent have different characteristics - the covered section provides ease of removal while the bare metal anchoring region provides migration resistance. This local differentiation resolves the contradiction by assigning specific functions to specific locations.
Data Source
AI summary
The present disclosure relates generally to stents, systems, and methods for gastrointestinal treatment. In some embodiments, a stent may include a tubular scaffold having a first end opposite a second end, wherein a lumen extends between the first and second ends. The tubular scaffold may include a flared section and a medial section extending from the flared section, wherein a first diameter of the flared section is greater than a second diameter of the medial section. The stent may further include a liner extending partially along a surface of the tubular scaffold, wherein the liner is spaced from an anchoring region of the flared section to promote tissue ingrowth with the flared section.