Reinforced Flared Stent Rim for Anti-Migration Retention

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Solution Overview

Problem

Existing stents face issues such as migration after implantation, leading to complications like leakage and tissue damage, particularly in procedures like hepaticogastrostomy, where stent migration out of the stomach is a severe risk.

Innovation Solution

A stent design featuring a flared region with increased scaffolding density and a reinforced annular rim at the end, which provides additional rigidity and prevents migration by increasing the force required for displacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the stent is designed with a flared region and increased scaffolding density, then the retention and anti-migration performance is improved, but the device complexity increases

Engineering Contradiction:

Improvestent retentionVSAvoidscaffolding structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The stent applies local quality by creating a flared region with increased scaffolding density at specific locations (end regions) rather than uniform density throughout. The circumferential rim has concentrated interwoven wires forming an annular ring, while the body region maintains standard scaffolding density. This localized reinforcement improves retention where needed without unnecessarily complicating the entire device structure.

Inventive Principle:

Principle #3Local quality

2Force

If the circumferential rim diameter is increased to improve retention, then the stent resistance to displacement is improved, but the stent may cause more tissue damage

Engineering Contradiction:

Improveresistance to displacementVSAvoidtissue damage

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The flared region with increased diameter is localized to the end regions of the stent rather than the entire structure. The circumferential rim at the flared region has a greater diameter than the body region, providing enhanced retention force at the anchoring points while the narrower body region minimizes tissue damage in the central passage area.

Inventive Principle:

Principle #3Local quality

3Strength

If the scaffolding density is increased at the circumferential rim, then the structural strength is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvestructural strengthVSAvoidscaffolding density control

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The manufacturing process targets specific local regions (end regions and circumferential rim) for increased scaffolding density rather than requiring uniform high-density construction throughout. This localized approach allows standard manufacturing techniques to produce the majority of the stent, with only specific zones requiring enhanced precision during the weaving or braiding process.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260047946A1Stent with reinforced flared region

Publication Date: 2026.02.19 BOSTON SCIENTIFIC SCIMED INC

AI summary

A stent, such as transluminal stent, is disclosed. The stent includes a tubular member with a proximal end, a distal end, and a central portion therebetween. The elongate tubular member comprises a scaffolding forming a plurality of cells and defining a lumen of the elongate tubular member. A proximal portion of the tubular member forms a retention member, wherein the diameter of the retention member is greater than the diameter of the central portion, and wherein a proximal end of the retention member includes an area of increased scaffolding density.