Braided Flow Diverter Stent Using Flat-Round Wire Geometry

Solution Overview

Problem

Braided flow diverting stents constructed from all round or all rectangular cross-section wires either maximize wall thickness or area coverage but not both, and have limitations in minimum crimped diameter for delivery, affecting their effectiveness in treating aneurysms.

Innovation Solution

A braided flow diverting stent formed from alternating round and rectangular elongated members, which maintains significant wall thickness while increasing vessel wall area coverage, and allows for low crimped diameters for delivery by sliding round wires over rectangular ones, improving axial flow disruption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If braided flow diverting stents are constructed from round wires, then wall thickness is maximized, but vessel wall area coverage is not maximized

Engineering Contradiction:

Improvewall thicknessVSAvoidvessel wall area coverage

Core Design Contradiction:

StrengthVSArea of stationary object

Solution Approach 1:

The stent employs a hybrid construction where some elongate members have round cross-sections (providing thickness) and others have rectangular cross-sections (providing coverage), with each type strategically positioned to optimize local properties throughout the structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The stent combines elongate members with different cross-sectional geometries (round and rectangular) into a single integrated structure, leveraging the advantages of each shape to achieve both adequate wall thickness and maximum vessel wall coverage

Inventive Principle:

Principle #40Composite materials

2Area of stationary object

If braided stents are constructed from rectangular cross-section wires, then vessel wall area coverage is maximized, but wall thickness is minimized

Engineering Contradiction:

Improvevessel wall area coverageVSAvoidwall thickness

Core Design Contradiction:

Area of stationary objectVSStrength

Solution Approach 1:

The stent employs a hybrid construction where some elongate members have round cross-sections (providing thickness) and others have rectangular cross-sections (providing coverage), with each type strategically positioned to optimize local properties throughout the structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The stent combines elongate members with different cross-sectional geometries (round and rectangular) into a single integrated structure, leveraging the advantages of each shape to achieve both adequate wall thickness and maximum vessel wall coverage

Inventive Principle:

Principle #40Composite materials

3Area of stationary object

If braided stents are constructed from rectangular cross-section wires, then vessel wall area coverage is maximized, but minimum crimped diameter increases

Engineering Contradiction:

Improvevessel wall area coverageVSAvoidminimum crimped diameter for delivery

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

The stent employs a hybrid construction where some elongate members have round cross-sections (providing thickness) and others have rectangular cross-sections (providing coverage), with each type strategically positioned to optimize local properties throughout the structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The stent combines elongate members with different cross-sectional geometries (round and rectangular) into a single integrated structure, leveraging the advantages of each shape to achieve both adequate wall thickness and maximum vessel wall coverage

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS11389311B2Braided flow diverter using flat-round technology

Publication Date: 2022.07.19 DEPUY SYNTHES PROD INC

AI summary

A generally tubular braided flow diverting stent is formed of alternating round and rectangular elongated members, for treatment of aneurysms. The generally tubular braided flow diverting stent maintains a significant wall thickness while increasing area coverage of a vessel wall. Sliding of the round elongated members over the rectangular elongated members allows the stent to be crimped to very low diameters for delivery in narrow portions of the vasculature.