Intra-Aneurysmal Stent Structure for Wide-Neck Dome Stability

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Solution Overview

Problem

Existing intra-aneurysmal devices are unstable, particularly for wide neck aneurysms, require additional equipment like coils, and have long-term weaknesses, posing risks to patients and complicating procedures.

Innovation Solution

An intra-aneurysmal device with a stent, ellipsoid intermediate portion, and dome-shaped head, designed for stability and blood flow diversion, eliminating the need for supplementary coils and ensuring long-term anchorage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a dome is used to fill the aneurysmal sac, then blood flow towards the aneurysm is limited, but the dome is unstable and can move or escape from the aneurysm over time

Engineering Contradiction:

Improvestability of dome in aneurysmVSAvoidapplicability to wide neck aneurysms

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The device is divided into three functional segments: a stent portion for anchorage in the artery, an intermediate portion with gradual narrowing for transition, and a dome portion for filling the aneurysmal sac. This segmentation allows each part to perform its specific function optimally, with the stent providing stable anchorage and the dome providing reliable filling, resolving the stability issue while maintaining adaptability to different aneurysm types including wide neck aneurysms

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An intermediate portion is introduced between the stent and the dome, featuring a gradual narrowing profile. This intermediary structure acts as a transition zone that facilitates smooth deployment and stable positioning of the dome within the aneurysm, preventing movement or escape while maintaining compatibility with wide neck anatomies

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If coils are used to close off the vessel, then blood flow is hindered, but coils can inadvertently be positioned in the source artery or move from the aneurysm to the source artery

Engineering Contradiction:

Improvepositioning accuracy of closure materialVSAvoidnumber of components required

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention merges the anchorage function (stent), transition function (intermediate portion), and closure function (dome) into a single integrated device. This eliminates the need for separate coil deployment tools and procedures, ensuring that the closure material remains confined to the aneurysm sac and cannot migrate to the source artery, thereby improving positioning accuracy while reducing overall device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The harmful aspect of coil migration is eliminated by extracting the coil deployment step and replacing it with an integrated dome structure that is pre-configured to remain within the aneurysm. The dome is designed to fill the aneurysmal sac without protruding into or migrating to the source artery, removing the risk of inadvertent positioning in the bloodstream

Inventive Principle:

Principle #2Taking out (Extraction)

3Duration of action of stationary object

If a stent with thinned intermediate portion is used, then the device can be deployed, but it cannot provide long term anchorage and has architectural weaknesses

Engineering Contradiction:

Improvelong term anchorage stabilityVSAvoidstructural strength of intermediate portion

Core Design Contradiction:

Duration of action of stationary objectVSStrength

Solution Approach 1:

The device exhibits local quality variations: the stent portion has a robust mesh structure for strong anchorage in the artery, the intermediate portion has a gradual narrowing with appropriate thickness for transition and support, and the dome portion has a configuration optimized for filling the aneurysm. This localized optimization allows the intermediate portion to provide sufficient structural support for long-term anchorage without compromising overall device deployability or causing architectural weaknesses

Inventive Principle:

Principle #3Local quality

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 device provides stable anchorage for various aneurysm types, including wide neck, reduces blood flow, and minimizes thrombosis risk, enhancing procedural safety and efficiency.

Implementation Method 1

Anchorage is made by endothelialisation of the stent on the internal wall of the artery

Methodology Applied

Scientific EffectEndothelialisation:

Implementation Method 2

This isolates the aneurysm from the blood flow of the artery so that the aneurysmal sac will not rupture under the effect of blood pressure

Methodology Applied

Scientific EffectPhysical isolation: Physical Containment

Data Source

PatentUS12478378B2Intra-aneurysmal device

Publication Date: 2025.11.25 CENT HOSPITALER & UNIV DE MONTPELLIER

AI summary

Intra-aneurysmal device (1) for the treatment of an aneurysm (2), this device (1) comprising:a stent (3) with an approximately circular section with diameter (D1), the stent (3) being suitable for and designed to anchor the device (1) in an artery,a head (5) designed to be inserted in the aneurysm (2), the head (5) being capable of significantly reducing blood flow in the aneurysm (2),an intermediate portion (4) located between the head (5) and the stent (3), and connecting the head (5) to the stent (3),wherein the intermediate portion (4) is in the form of an ellipsoid, of which a distal end (11) is connected to the head (5) and a proximal end (12) is connected to the stent (3).