Thoracic Aortic Stent Preventing Bare Segment Overturn

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Solution Overview

Problem

Existing thoracic aortic covered stents face issues with the bare stent segment overturning during deployment, leading to incomplete apposition of the covered stent segment to the vessel wall, which can result in 'turnover' effects, damage to the blood vessel, and potential treatment failure due to ongoing blood flow into aneurysms or dissections.

Innovation Solution

A thoracic aortic covered stent design featuring a bare wave-shaped ring and a covered stent segment with wave-shaped rings connected by steel jackets and suturing, including connecting members that prevent the bare stent segment from overturning by providing rigid constraints, ensuring secure apposition of the covered stent segment to the vessel wall.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a bare stent segment is used to improve anchoring and apposition performance, then the adaptability for patients with dissection crevasse close to branch vessels is improved, but the metal wire may overturn towards the vessel wall during deployment causing turnover effect and damage

Engineering Contradiction:

Improveadaptability for patients with dissection crevasse close to branch vesselsVSAvoidturnover effect and damage to blood vessel

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The connecting assembly is pre-configured between the bare stent segment and covered stent segment to establish rigid constraints before deployment. This preliminary structural arrangement prevents the metal wire from overturning during the deployment process, eliminating the turnover effect while maintaining the anchoring benefits of the bare stent segment

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The stent combines different materials (metal wire for the bare stent segment and membrane material for the covered segment) with a connecting assembly that rigidly joins them. This composite structure leverages the advantages of each material while preventing the harmful overturning effect through the rigid connection

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If flexible connection is used between bare stent segment and covered stent segment to ensure overall flexibility, then the stent can adapt to vessel curvature, but the pushing force during release causes metal wire to overturn and contact with vessel wall

Engineering Contradiction:

Improveoverall flexibility of stentVSAvoidmetal wire overturning and contact with vessel wall

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The connecting assembly is designed in advance to provide rigid constraints between segments. This preliminary structural arrangement ensures that during the pushing and deployment process, the metal wire remains constrained and cannot overturn, while still allowing the stent to maintain flexibility for navigating vessel curvature

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If rigid connecting assembly is used to prevent overturning, then the apposition performance of covered stent segment to vessel wall is improved, but the device complexity increases

Engineering Contradiction:

Improveapposition performance of covered stent segment to vessel wallVSAvoidstructure complexity of connecting assembly

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The stent is divided into distinct segments (bare stent segment, connecting assembly, covered stent segment) that can be manufactured separately and then assembled. This segmentation allows for optimized manufacturing of each component while the connecting assembly provides the necessary rigid constraints to prevent overturning and ensure proper apposition

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP3075352B1Thoracic aortic covered stent

Publication Date: 2021.01.06 LIFETECH SCI (SHENZHEN) CO LTD

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AI summary

The present invention relates to a thoracic aortic covered stent (100), comprising a bare stent segment (110) and a covered stent segment (120). The bare stent segment (110) comprises a bare wave-shaped ring (111); the covered stent segment (120) has a lesser curvature side region (100c), a greater curvature side region (100a), and two opposite intermediate regions (100b) located between the lesser curvature side region (100c) and the greater curvature side region (100a) respectively; and the covered stent segment (120) comprises a first proximal wave-shaped ring (121). The stent (100) further comprises a first connecting member (131), a first side connecting member (132) and a second side connecting member (133) all connected to the bare wave-shaped ring (111) and the first proximal wave-shaped ring (121), wherein the first connecting member (131) is arranged in the lesser curvature side region (100c), and the first side connecting member (132) and the second side connecting member (133) are arranged in the two intermediate regions (100b) respectively. The stent (100) when located near the lesser curvature side (22) with a relatively small radius of curvature has a connecting assembly rigidly connecting the bare stent segment (110) and the covered stent segment (120), and through the constraints thereof, the bare stent segment (110) can be effectively prevented from overturning towards the vessel wall during the release process, so that the proximal end of the covered stent segment (120) is securely apposed to the wall, thereby avoiding the "turnover" effect.