Offset Parallelogram Mesh Occlusion Device
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Solution Overview
Problem
Existing occlusion devices face issues with film rupture during deployment due to excessive stress on thin film meshes, particularly when transitioning from a closed to an open configuration, which limits their applicability in supporting stenosed vessels.
Innovation Solution
The design incorporates a tubular occlusion device with a screen member featuring offset substantially parallelogram-shaped openings, which reduces material stress and minimizes the risk of film rupture by maintaining a lower porosity and aligning with the support member during expansion, utilizing a mandrel for manufacturing and materials like nitinol for superelastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thin film mesh is used for occlusion device, then flexibility and conformability are improved, but film rupture risk increases during deployment
Solution Approach 1:
The patent applies asymmetry by using a non-diamond-shaped cell geometry (such as rectangular or square cells) instead of the conventional diamond shape. This asymmetric design change redistributes the stress during expansion, avoiding the high stress concentration at the slit ends of diamond-shaped meshes, thereby reducing film rupture risk while maintaining flexibility
Solution Approach 2:
The patent changes the geometric parameters of the mesh cells, specifically using cell shapes with more uniform wall thickness and different aspect ratios compared to diamond shapes. This parameter modification allows for more uniform stress distribution during radial expansion, reducing the likelihood of film rupture while preserving the flexibility needed for catheter delivery
2Reliability
If mesh porosity is reduced for better occlusion, then occlusion effectiveness is improved, but structural support capability deteriorates
Solution Approach 1:
The patent employs composite construction by combining the thin film mesh with an underlying support structure (such as a stent framework). This composite design allows the mesh to provide fine occlusion with low porosity while the support structure bears the mechanical loads, preventing the mesh from rupturing under stress
Solution Approach 2:
The patent segments the occlusion device into distinct functional components: a support structure that provides mechanical strength and a mesh layer that provides occlusion. This segmentation allows each component to be optimized independently - the support structure for strength and the mesh for low porosity occlusion effectiveness
3Volume of moving object
If diamond-shaped cell configuration is used, then compact delivery is improved, but stress concentration at slit ends increases
Solution Approach 1:
The patent replaces the symmetric diamond-shaped cell configuration with asymmetric cell geometries (such as rectangular or square cells with different dimensions). This asymmetric design eliminates the pointed vertices of diamond shapes that cause stress concentration, distributing mechanical stress more uniformly across the cell walls during expansion while still achieving compact delivery
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 solution effectively decreases the risk of film rupture and ensures uniform radial expansion, providing a more robust and reliable occlusion device with controlled porosity, suitable for various vascular applications.
Implementation Method 1
a generally tubular support member radially expandable from a compressed condition to an expanded condition for occlusion action within a body vessel
Implementation Method 2
utilizing a mandrel for manufacturing and materials like nitinol for superelastic properties
Data Source
AI summary
An occlusion device for implantation within a body vessel is provided with a screen member and an associated support member. The occlusion device is radially expandable from a compressed condition, suitable for inserting the device in an introducer, to a deployed or expanded condition within a vessel. The screen member includes a plurality of substantially parallelogram-shaped openings in the compressed condition arranged in longitudinal rows, the openings being axially offset from each other. The porosity of the screen member is less than the porosity of the support member in the expanded condition.