Transcatheter Aortic Valve Bilateral Locking for Accurate Positioning
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Solution Overview
Problem
The positioning of the positioning member in transcatheter aortic valve replacement devices is affected during the stent release process due to an unreasonable structural design, leading to inaccurate positioning and potential adverse surgical consequences.
Innovation Solution
A transcatheter aortic valve replacement apparatus with bilateral locking function, featuring a self-expansion stent, valve skirt, valve leaflet, elastic positioning members, and separate outflow and inflow end release members, ensuring independent functions and stability through staggered connection points and distributed force dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the positioning member and outflow end release member share the same connection structure, then the device structure is simplified, but the positioning accuracy deteriorates due to interference during release
Solution Approach 1:
The patent divides the release mechanism into separate components: an inflow end release member and an outflow end release member. This segmentation allows independent control of the positioning member and stent release processes, preventing interference between functions while maintaining overall structural efficiency
Solution Approach 2:
The outflow end release member is extracted as a separate functional component from the positioning member structure. This extraction enables the release function to be independently controlled without affecting the positioning accuracy of the positioning member
2Ease of manufacture
If the connection point is located at the vertex of the grid structure, then the manufacturing is simplified, but the structural strength deteriorates due to stress concentration
Solution Approach 1:
The patent applies different connection configurations at different locations of the grid structure. At vertices, the connection accommodates simplified fabrication, while at non-vertex locations, the connection is designed to distribute stress and avoid concentration, optimizing both manufacturability and structural strength locally
Solution Approach 2:
The connection structure is designed in advance to avoid stress concentration at critical points. By positioning connections at non-vertex locations or designing the connection geometry to distribute loads, the structure preemptively cushions against potential fracture points before stress accumulation occurs
3Volume of moving object
If the release member and positioning member are integrated, then the device compactness is improved, but the operational reliability deteriorates due to function interference
Solution Approach 1:
The patent segments the release function into a separate outflow end release member that operates independently from the positioning member. This segmentation prevents functional interference while maintaining device compactness through coordinated design of the separated components
Solution Approach 2:
The outflow end release member acts as an intermediary component that mediates between the operator and the stent release process. This intermediary function allows precise control of stent deployment without directly interfering with the positioning member's stability and accuracy
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 apparatus achieves accurate positioning and enhanced stability by separating the release and positioning functions, reducing the risk of fractures and ensuring compactness, with additional features like repair members and protective structures to prevent damage.
Implementation Method 1
at least two elastic positioning members (40)
Implementation Method 2
self-expansion stent (10)
Data Source
AI summary
A transcatheter aortic valve replacement apparatus having a bilateral locking function includes a self-expanding stent, a valve skirt, a valve leaflet, an elastic positioning member, and an outflow end release member; a through-hole is defined in the self-expanding stent, the self-expanding stent is provided with an inflow end and an outflow end, and the sidewall of the self-expanding stent is a grid structure; the valve skirt is connected to the sidewall of the through-hole; the valve leaflet is connected to the inner side of the valve skirt, and the sidewall of the self-expanding stent adjacent to the outflow end is defined by a plurality of outflow end grids; the elastic positioning member is provided with a U-shaped portion and connecting arms located at two ends of the U-shaped portion, and the connecting arms are connected to the self-expanding stent or to the outflow end release member, forming first connection points.