Segmented Aortic Prosthesis Weave for Renal Artery Preservation

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Solution Overview

Problem

Conventional aortic prostheses face challenges in deployment and fixation when the upper proximal aortic neck is not well-defined or healthy, particularly in cases of abdominal aneurysms, leading to potential renal artery occlusion and blood flow issues due to irregular aortic neck shapes and sizes.

Innovation Solution

A flexible aortic prosthesis with a tubular mesh structure featuring three differentiated weaves - a very loose weave for renal artery passage, an intermediate weave for flexibility, and a tight weave for secure anchoring within the aneurysm, along with an expandable balloon for secure fixation above the renal arteries, allowing for intraluminal deployment and avoiding renal artery occlusion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional aortic prosthesis is deployed to treat abdominal aneurysm, then the aneurysm can be excluded from blood flow, but the prosthesis cannot be securely anchored when the upper proximal aortic neck is not healthy or well-defined

Engineering Contradiction:

Improvesecure anchoring of prosthesisVSAvoidadaptability to varying aortic neck conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The prosthesis is divided into three distinct sections with different weave densities: a very loose weave section for renal artery passage, an intermediate weave section for flexibility, and a tight weave section for secure anchoring within the aneurysm. This segmentation allows each section to perform its specific function optimally.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the prosthesis have different local qualities in terms of weave density. The very loose weave in the upper portion allows renal artery passage, while the tight weave in the lower portion provides secure anchoring. This local differentiation resolves the contradiction between secure anchoring and adaptability to varying aortic neck conditions.

Inventive Principle:

Principle #3Local quality

2Reliability

If the prosthesis is anchored above the renal arteries to ensure secure fixation, then anchoring reliability is improved, but the renal arteries may be occluded

Engineering Contradiction:

Improvefixation reliabilityVSAvoidrenal artery occlusion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The prosthesis uses a very loose weave fabric in its upper portion, which functions as a porous structure. This porous design allows blood flow to pass through to the renal arteries while still providing adequate anchoring, thus preventing renal artery occlusion while maintaining fixation reliability.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The prosthesis incorporates an expandable balloon that can be inflated to provide temporary additional support during deployment, then deflated to allow natural blood flow dynamics to the renal arteries. This dynamic adjustment helps prevent occlusion while ensuring proper positioning.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the prosthesis uses a uniform tight weave structure, then secure anchoring within the aneurysm is achieved, but blood flow to renal arteries is obstructed

Engineering Contradiction:

Improveanchoring securityVSAvoidblood flow quantity to renal arteries

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The prosthesis features local quality differentiation with a very loose weave in the upper portion for renal artery passage and a tight weave in the lower portion for secure anchoring. This resolves the contradiction by providing both anchoring security and adequate blood flow quantity to renal arteries through spatially differentiated structure.

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

Enables secure anchoring and sealing of the prosthesis without obstructing renal arteries, ensuring effective blood flow and preventing aneurysm rupture by adapting to varying aortic neck conditions, thus improving treatment outcomes for abdominal aortic aneurysms.

Implementation Method 1

expanding said anchoring means with said expandable balloon so that said anchoring means is fixedly held against said aortic wall

Methodology Applied

Scientific EffectRadial expansion: Pressure Increase

Implementation Method 2

a very loose weave fabric in said upper portion, said very loose weave fabric allowing passage of blood flow to said renal arteries

Methodology Applied

Scientific EffectFluid flow through porous structure: Porosity

Data Source

PatentUS10849732B2Prosthesis for treating abdominal aortic aneurysm and method

Publication Date: 2020.12.01 BARONE

AI summary

An aortic prosthesis for the treatment of abdominal aortic aneurysms, wherein the prosthesis is implanted intraluminally and comprises a main body having a generally cylindrical shape with an upper portion intended to be secured firmly above the renal arteries through an anchoring means, a lower portion freely moving at a position within the aneurysm and above the iliac arteries, and an intermediate portion arranged between the upper and lower portions, and the main body comprising a flexible fabric of woven material having a very loose weave in the upper portion so as to allow fluid communication between the interior of the prosthesis and the renal arteries, an intermediate weave in the intermediate portion and a tight weave in the lower portion of the main body.