Nested Braid Aneurysm Occlusion Device
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Solution Overview
Problem
Current treatments for aneurysms, such as endovascular and occlusive devices, face challenges in effectively occluding the aneurysm neck without blocking blood flow to perforator vessels, leading to potential severe damage and complications like re-canalization or coil compaction.
Innovation Solution
A braid device with a collapsible, radially expandable structure that forms an outer and inner occlusive sack, where the inner sack has higher porosity than the outer, is deployed within a microcatheter and expanded to occlude the aneurysm neck, allowing for adjustable orientation and packing density to divert blood flow while minimizing risk of rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If embolic coils are delivered to fill the aneurysm sac, then the aneurysm volume is occluded, but the treatment is permanent and does not allow for reintegration into the parent vessel shape
Solution Approach 1:
The occlusive device features a dynamic structure that can be compressed into a low-profile configuration for delivery through a catheter, then expanded at the target site to occlude the aneurysm. This dynamic transformation allows the device to adapt between delivery and treatment states, enabling both safe delivery and effective occlusion without permanent deformation of the parent vessel.
2Reliability
If the aneurysm neck is occluded to achieve venostasis, then natural thrombotic mass formation occurs, but blood flow to perforator vessels may be blocked causing severe damage
Solution Approach 1:
The occlusive device is designed with non-uniform porosity distribution, featuring a distal portion with lower porosity for effective neck occlusion and a proximal portion with higher porosity to maintain blood flow to perforator vessels. This local quality variation allows the device to simultaneously achieve venostasis in the aneurysm while preserving critical blood flow pathways, preventing both thrombotic mass formation and perforator vessel damage.
3Reliability
If a low porosity structure is used at the aneurysm neck, then effective occlusion is achieved, but blood flow to perforator vessels may be restricted
Solution Approach 1:
The occlusive device is segmented into distinct regions with different porosity characteristics: a distal segment with lower porosity for neck occlusion and a proximal segment with higher porosity for maintaining perforator flow. This segmentation allows each portion to perform its specific function optimally, achieving effective neck occlusion while preserving blood flow to perforator vessels through the more porous proximal region.
4Reliability
If embolic coils are used to treat the aneurysm, then the aneurysm sac is filled, but re-canalization and coil compaction can occur over time
Solution Approach 1:
The occlusive device employs a nested structure with an inner occlusive element positioned within an outer occlusive element. This nested configuration provides mutual support and stabilization, preventing coil compaction and re-canalization by maintaining the structural integrity of the occlusive mass over time. The inner element reinforces the outer element, creating a more stable and permanent occlusion compared to standalone coil structures.
Data Source
AI summary
The present disclosure relates to a braid for treating an aneurysm. The braid can include a first radially expandable segment operable to move from a collapsed state within a microcatheter to a deployed state distal of the microcatheter. The first radially expandable segment can be capable of radially expanding to form an outer occlusive sack in the aneurysm in the deployed state. The braid can also include a second radially expandable segment operable to move from the collapsed state within the microcatheter to the deployed state distal of the microcatheter, wherein the second radially expandable segment is capable of radially expanding inside the outer occlusive sack to form an inner occlusive sack in the outer occlusive sack in the deployed state.