Covered Stent Window Imaging Member Spiral Design
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Solution Overview
Problem
Existing covered stents have limited imaging markers at the edge of the hole, making it difficult to accurately determine the position of the edge during guide wire track establishment, which prolongs procedure time and affects blood supply to arterial branch vessels.
Innovation Solution
A covered stent design featuring a hollow tubular main body with a window and an elastic supporting member, where an imaging member is spirally wound around the elastic supporting member, providing good imaging and supporting performance, and is movably connected to avoid deformation and ensure smooth guide wire passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only 4 imaging markers are provided at the edge of the hole, then the device complexity is reduced, but the measurement precision of the hole edge position deteriorates
Solution Approach 1:
The imaging member is divided into multiple discrete imaging units (first imaging units and second imaging units) distributed along the window periphery. Each imaging unit acts as an independent marker, providing detailed position information without requiring a single complex imaging structure
Solution Approach 2:
The imaging units are arranged in a spiral pattern around the window periphery, transitioning from a simple linear or point-based marking system to a two-dimensional distributed arrangement. This spiral distribution provides comprehensive angular and radial position information, significantly improving hole edge localization accuracy
2Manufacturing precision
If the imaging member is rigidly fixed to the elastic supporting member, then the manufacturing precision is improved, but the adaptability to deformation deteriorates
Solution Approach 1:
The connection between the imaging member and elastic supporting member is designed to be dynamic rather than rigid. The imaging member can move relative to the elastic supporting member along the spiral path, allowing the system to adapt to deformations while maintaining imaging functionality
Solution Approach 2:
The imaging member is positioned within the spiral groove of the elastic supporting member, creating a nested structure where the imaging member can slide or move within the constrained spiral path. This nested arrangement provides both positioning guidance and deformation accommodation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances imaging and supporting capabilities at the window periphery, allowing for improved guide wire tracking and reduced procedure time by preventing deformation and ensuring accurate positioning.
Implementation Method 1
an elastic supporting member... in a natural state, two end portions of the elastic supporting member partially overlap
Implementation Method 2
under fluoroscopy, a covered stent is delivered to a lesion location... the imaging member is spirally wound around an outer surface of the elastic supporting member
Implementation Method 3
at least part of the imaging member is movably connected to the elastic supporting member... to avoid obvious bending of the imaging member
Data Source
AI summary
Disclosed is a covered stent (100), including a hollow tubular main body (10), and a window (20) provided on a side wall of the tubular main body (10). An elastic supporting member (30) is provided at a periphery of the window (20); an imaging member (40) is provided on the elastic supporting member (30); and at least part of the imaging member (40) is movably connected to the elastic supporting member (30). Since the imaging member (40) and the elastic supporting member (30) are located at the periphery of the window (20), the imaging member (40) and the elastic supporting member (30) enable the periphery of the window (20) to simultaneously have a good imaging performance and a good supporting performance.