Lumen Stent Tapered Segment Branch Window Sizing
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Solution Overview
Problem
Standardized straight-tube stents struggle to accommodate the diverse anatomical structures and individual variations in patients, often leading to occlusion of side branch vessels due to inaccurate placement, and customized multi-branch stents are expensive and have a long manufacturing cycle, making them unsuitable for emergency cases.
Innovation Solution
A lumen stent design featuring a tubular body with inner and outer branches on a tapered segment, where the inner branch window is larger than the outer branch window, allowing for more operation space for guide wires and reducing blood flow pressure, along with a partial-release device for precise positioning, to enhance placement accuracy and indication range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standardized straight-tube covered stents are used, then the treatment process is simple and fast, but the stent cannot accommodate diverse anatomical structures and individual variations, leading to occlusion of side branch vessels
Solution Approach 1:
The stent is divided into multiple body segments (first body segment, second body segment) with different structural characteristics. The first body segment has a larger diameter to accommodate the main vessel, while the second body segment has a smaller diameter to fit the narrowed vessel portion, allowing the stent to adapt to anatomical variations without compromising treatment speed
Solution Approach 2:
Different portions of the stent are designed with different properties: the first body segment has a larger diameter for the main vessel, the second body segment has a smaller diameter for the narrowed portion, and branch openings are strategically positioned at specific segments. This local differentiation allows the stent to accommodate diverse anatomical structures while maintaining a standardized design that can be deployed quickly
2Adaptability or versatility
If customized multi-branch stents are used, then the stent can meet specific anatomical requirements, but the manufacturing cost is high and the manufacturing cycle is long
Solution Approach 1:
The stent is designed with multiple body segments and branch openings that can accommodate different anatomical configurations. The first body segment, second body segment, and various branch opening positions can be adapted to different patient anatomies without requiring complete customization, enabling a single standardized stent design to serve multiple functions and anatomical scenarios
Solution Approach 2:
The stent incorporates expandable structures that can be adjusted during deployment to match the specific anatomical requirements of each patient. The body segments and branch openings can be dynamically positioned and sized to accommodate individual variations, providing customization benefits without the need for custom manufacturing
3Productivity
If the release position of the covered stent is not accurate, then the stent can be deployed quickly, but the side branch vessels are often occluded
Solution Approach 1:
The stent is designed with predetermined branch opening positions at specific body segments that are optimized to align with common side branch vessel locations. This preliminary positioning design allows the stent to be deployed quickly without requiring precise manual positioning, as the branch openings are pre-configured to minimize occlusion risk
Solution Approach 2:
The stent incorporates radiopaque markers and imaging-compatible materials that provide real-time feedback during deployment to guide accurate positioning. The multiple body segments and branch openings can be visualized during the procedure to ensure proper alignment with the anatomy, allowing for minor adjustments while maintaining relatively fast deployment
Data Source
AI summary
A lumen stent (100) and an implant are provided. The lumen stent includes a tubular body (11), an inner branch (12) and an outer branch (13) which are respectively communicated with the tubular body (11). The tubular body (11) includes a first body segment (111), a tapered segment (112) and a second body segment (113) which are connected in sequence. The tapered segment (112) is provided with an outer branch window (110b) and an inner branch window (110a). The proximal end of the outer branch (13) is connected to the outer branch window (110b). The distal end of the inner branch (12) is connected to the inner branch window (110a). The area of the inner branch window (110a) is larger than that of the outer branch window (110b). The beneficial effects are as follows: since the area of the inner branch window (110a) is larger than that of the outer branch window (110b), most of blood flow can rapidly pass through the inner branch (12), so that the blood flow pressure of the outer branch (13) is reduced, and the distal end of the outer branch (13) is prevented from tilting and touching an inner wall of a tumor cavity.