Stent Graft Side Opening Alignment Tolerance
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Solution Overview
Problem
The challenge lies in achieving precise alignment of stent grafts with branch vessel openings during implantation, as the position of blood vessel openings varies between patients, requiring high technical accuracy and experience, which is not feasible for all tubular tissues like blood vessels, digestive tracts, or bile ducts.
Innovation Solution
A stent graft design featuring a framework section with a combination of full and non-full circumferential frame body structures, where the non-full section allows for increased positional tolerance and flexibility, and the full section enhances strength, reducing the need for precise alignment and minimizing displacement due to blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional stent graft with a side surface opening is used, then the graft can be connected to the branch vessel, but highly accurate alignment is required which increases the difficulty of operation and dependency on practitioner skill
Solution Approach 1:
The frame body is designed with non-full circumferential sections at specific locations corresponding to side surface openings, creating local structural differences. This allows the graft to be more compliant at opening locations for easier alignment while maintaining overall structural integrity
Solution Approach 2:
The frame bodies are designed to be flexible and adaptable during implantation, allowing the side surface openings to self-align with branch vessel openings through natural vessel geometry rather than requiring precise pre-positioning
2Strength
If the frame body is made fully circumferential to increase strength, then the graft strength increases, but the alignment tolerance decreases and operational difficulty increases
Solution Approach 1:
The frame body is segmented into full circumferential sections and non-full circumferential sections. The full sections provide strength and structural support, while the non-full sections at opening locations provide flexibility and alignment tolerance
Solution Approach 2:
Different circumferential coverage is applied at different locations of the frame body - full coverage for strength where needed, and non-full coverage for flexibility at side surface opening locations
Data Source
AI summary
The present invention eliminates the need for highly accurate alignment with a branched tubular tissue when implanting a stent graft. A stent graft 30 comprises: a framework section 31; and a tubular graft section 40. A side surface opening 42 that passes through to the lumen of the graft section is provided in one section of a tube wall 41 of the graft section. In the framework section, among the six frame bodies, the frame bodies 34, 35 that are provided facing the side surface opening section have a first frame body structure section Q that is present in the tube wall along the entire circumference, and a second frame body structure section P that is present in the tube wall in a partial region 41A, which excludes the side surface opening section in the circumferential direction of the tube wall.