Tubular Endoprosthesis Valve Fixation via Variable Cross-Section Stops
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing kits for implanting tubular endoprostheses and prosthetic valves in blood vessels face challenges with approximate positioning and insecure fixation of the valve within the endoprosthesis.
Innovation Solution
The kit features surfaces with variable cross-section portions that act as proximal and distal stops to prevent axial displacement and rotation of the prosthetic valve, ensuring secure and precise positioning by using radially protruding features and recesses for alignment and fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a prosthetic valve is implanted in a tubular endoprosthesis using conventional methods, then the valve can be positioned and fixed, but the positioning is only approximate and the fixation is not secure
Solution Approach 1:
The inner surface of the endoprosthesis is divided into multiple functional zones: a proximal stop portion with variable cross-section, a distal stop portion with variable cross-section, and intermediate portions. These segmented features work together to provide precise positioning and secure fixation of the prosthetic valve by blocking axial displacement in both directions and preventing rotation through complementary geometric shapes.
2Manufacturing precision
If the inner surface of the endoprosthesis has a constant cross-section, then the structure is simple, but the valve cannot be precisely positioned or securely fixed
Solution Approach 1:
The inner surface of the endoprosthesis features localized variations in cross-section at specific positions (proximal and distal stops) rather than being uniformly constant throughout. These local geometric modifications create functional zones that provide precise positioning and secure fixation, while the majority of the surface maintains simplicity. The variable cross-section portions have shapes that complement corresponding features on the valve's outer surface.
Data Source
AI summary
The invention relates to a kit including a tubular endoprosthesis having an inner surface delimiting a channel with a longitudinal axis. The kit includes a prosthetic valve designed to be implanted in the channel. The valve includes a supporting frame having an outer surface designed to be pressed against the inner surface, and a flexible cover connected to the frame. The inner surface has at least two segments with variable cross-section along the longitudinal axis. The segments form respectively a proximal stop and a distal stop to lock the axial displacement of the outer surface along the inner surface along two opposite directions.