Stent Graft Binding Thread for Renal Artery Alignment

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Solution Overview

Problem

Traditional stent grafts face challenges in accurately aligning with renal arteries due to inability to rotate freely before release, leading to reduced success rates in treating abdominal aortic aneurysms, especially in cases with short aneurysmal necks or involvement of visceral arteries.

Innovation Solution

A method involving a binding thread and control wire is used to circumferentially bind the stent graft, allowing it to rotate freely for precise alignment, comprising suturing coils on the stent sections and using a double-strand binding thread wound around the stent, with the control wire securing the thread ends, enabling the stent to expand spontaneously to vessel size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the stent graft is bound tightly to prevent displacement, then the stent stability is improved, but the stent cannot rotate freely for alignment

Engineering Contradiction:

Improvestent stabilityVSAvoidrotation freedom for alignment

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The stent graft is bound in a compressed state before implantation to maintain stability during delivery, but the binding is designed to be released after the stent is positioned in the vessel, allowing rotation freedom during the critical alignment phase while maintaining stability during delivery

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the stent graft is designed with openings for vessel alignment, then the adaptability to visceral artery involvement is improved, but the difficulty of accurate alignment increases due to inability to rotate

Engineering Contradiction:

Improveadaptability to visceral artery involvementVSAvoidalignment precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The stent graft transitions from a static bound state during delivery to a dynamic free-rotating state after deployment, allowing the openings to be dynamically aligned with visceral arteries such as the renal artery while maintaining the adaptability needed for various anatomical configurations

Inventive Principle:

Principle #15Dynamics

3Stability of the object's composition

If the binding thread is used to constrain the stent graft, then the stent position stability is improved, but the alignment accuracy with renal artery deteriorates

Engineering Contradiction:

Improvestent position stabilityVSAvoidalignment accuracy with renal artery

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The binding thread is applied in advance to maintain stent position stability during delivery, but is designed to be released or loosened after the stent reaches the target location, allowing subsequent rotation and precise alignment with the renal artery opening without compromising the stability achieved during delivery

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2298248B1Stent graft with opening and method for binding the stent graft

Publication Date: 2017.04.19 SHANGHAI MICROPORT ENDOVASCULAR MEDTECH (GRP) CO LTD

Figure 1~2
Figure 3A~4
Figure 5A~5C

AI summary

A stent graft (1) with an opening (31, 32) and a method for binding the stent graft (1). The stent graft (1) includes multiple annular wave-shaped stent sections (10) and a tectorial membrane pipe (20) seamed with these stent sections (10). The tectorial membrane pipe (20) has at least one opening (31, 32). There is an opening fixing wire (40) seamed with the opening (31, 32) for supporting the opening.