Covered Stent Window Imaging Structure for Guide Wire Positioning
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Solution Overview
Problem
Existing covered stents have difficulty in accurately determining the position of the edge of the hole during guide wire track establishment due to insufficient imaging markers, leading to prolonged procedure times and challenges in smoothly passing the guide wire through the hole.
Innovation Solution
A covered stent design featuring a hollow tubular main body with a window and an elastic supporting member at its periphery, equipped with an imaging member that is movably connected to the supporting member, providing both good imaging and supporting performance, and allowing for relative movement between the imaging and supporting components to avoid deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 4 imaging markers are provided at the edge of the hole (one for each top, bottom, left and right parts), then the structure is simple, but it is difficult to accurately determine the position of the edge of the hole during guide wire track establishment
Solution Approach 1:
The imaging member is segmented into multiple imaging units (first imaging units and second imaging units) arranged along the spiral direction. Each imaging unit corresponds to a specific angular position, providing detailed position information. This segmentation transforms a single complex marker into multiple simple units, achieving high measurement precision without excessive structural complexity.
Solution Approach 2:
The imaging members are arranged in a spiral pattern around the elastic supporting member, adding an angular dimension to the position indication. Instead of only radial markers, the spiral arrangement provides both radial and angular position information, enabling accurate determination of the hole edge position from multiple perspectives (top, bottom, left, right, and intermediate positions).
2Reliability
If the imaging member is fixedly connected to the elastic supporting member, then the structure is stable, but the imaging member deforms obviously during bending deformation
Solution Approach 1:
The imaging member is movably connected to the elastic supporting member through mounting slots, allowing relative movement between the two components. When the elastic supporting member bends, the imaging member can slide along the mounting slots to accommodate the deformation, maintaining its shape and imaging functionality. This dynamic connection transforms a static fixed structure into an adaptive movable structure.
Solution Approach 2:
The mounting slot provides a flexible connection mechanism that allows the imaging member to adapt to the deformation of the elastic supporting member. The slot acts as a flexible guide that constrains the imaging member to move along a specific path while allowing necessary displacement, similar to how flexible shells accommodate deformation.
3Measurement precision
If the imaging member is located at the periphery of the window, then good imaging performance is achieved, but the supporting performance may be compromised
Solution Approach 1:
The imaging member and elastic supporting member are merged into a single integrated assembly where the imaging member is mounted on the elastic supporting member. This combination allows the elastic supporting member to provide structural support and positioning, while the imaging member provides imaging functionality. The two functions are combined without compromising either, as the elastic supporting member's strength is utilized to support the imaging member at the optimal imaging position.
Solution Approach 2:
The movable connection between the imaging member and elastic supporting member allows the system to dynamically adjust during deformation. When the elastic supporting member bends, the imaging member can move relative to it to maintain its position and imaging performance, while the elastic supporting member continues to provide the necessary structural support.
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 ensures accurate imaging and effective support at the window periphery, facilitating smooth guide wire passage and reducing procedure time by enabling the imaging member to move away from regions of greater deformation, thus maintaining functionality during bending deformations.
Implementation Method 1
an elastic supporting member is provided at a periphery of the window
Implementation Method 2
at least part of the imaging member is movably connected to the elastic supporting member... allowing for relative movement between the imaging and supporting components to avoid deformation
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.