Flow Diverter Mesh with Reinforced Wire Folding
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Solution Overview
Problem
Flow diverters for treating large neck and fusiform aneurysms face challenges in preventing blood flow while maintaining structural integrity, as they often require small wires that result in low radially expansive force, leading to potential migration and buckling issues.
Innovation Solution
A radially expandable tubular medical device with a mesh region and reinforcement region, where the mesh region is formed by braiding thicker first wires with thinner second wires, and the reinforcement region is enhanced by folding some of the first wires onto others, providing increased radially expansive force to prevent blood flow and migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small wires are used to form the flow diverter mesh, then blood flow blocking capability is improved, but radially expansive force decreases
Solution Approach 1:
The patent applies local quality by creating distinct regions with different wire configurations: the mesh region uses thinner second wires for effective blood flow blocking, while the reinforcement region uses thicker first wires folded onto themselves to provide high radially expansive force. This local differentiation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The flow diverter is segmented into functionally distinct regions: a mesh region for blood flow occlusion and reinforcement regions for structural support and anchoring. This segmentation allows the device to simultaneously achieve effective blood flow blocking in the mesh region while providing sufficient radially expansive force through the reinforcement regions.
2Reliability
If small wires are used to form the flow diverter mesh, then blood flow blocking capability is improved, but device stability deteriorates
Solution Approach 1:
The patent implements local quality by designing the reinforcement region with thicker first wires that are folded onto themselves, creating a structurally stable configuration. This localized structural enhancement provides device stability and prevents migration and buckling, while the mesh region maintains its blood flow blocking function with thinner second wires.
Solution Approach 2:
The flow diverter employs a composite structure combining two types of wire configurations: thinner second wires for mesh formation and blood flow blocking, and thicker first wires for reinforcement and structural stability. This composite approach integrates the advantages of both wire types into a single device that achieves both blood flow occlusion and device stability.
3Force
If thicker wires are used in the tubular body, then radially expansive force is improved, but blood flow blocking capability deteriorates
Solution Approach 1:
The patent applies local quality by assigning different wire thicknesses to different functional regions: thicker first wires are used in the reinforcement region to provide high radially expansive force, while thinner second wires are used in the mesh region to achieve effective blood flow blocking. This spatial differentiation of wire thickness allows each region to optimize its specific function.
Solution Approach 2:
The device is segmented into a reinforcement region with thicker wires for radially expansive force and a mesh region with thinner wires for blood flow blocking. This segmentation resolves the contradiction by ensuring that thicker wires are concentrated where structural support is needed, while thinner wires are used where blood flow occlusion is the primary function.
Data Source
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AI summary
A medical device configured to be positioned within an intraluminal passage. The medical device includes a tubular body which is radially expandable. The tubular body extends from a first end to a second end and includes a mesh region and a reinforcement region. The mesh region includes first wires braided with second wires, where the thickness of the first wires is great than the thickness of the second wires. Within the reinforcement region, at least one first wire is folded onto one of the first and second wires.