Nested Embolic Device for Aneurysm Occlusion Stability
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Solution Overview
Problem
Existing embolic devices for occluding aneurysms, particularly those with wide necks, face a high risk of migration from the aneurysm entrance zone into the feeding vessel, leading to ineffective occlusion.
Innovation Solution
An embolic device comprising a first segment that forms a three-dimensional structure with a cavity, and a second segment that extends from the first segment to form a smaller three-dimensional structure, which is accommodated within the cavity of the first structure, providing enhanced stability and occlusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-segment embolic device is used to occlude wide neck aneurysms, then the device can be delivered through the catheter, but the device migrates out of the aneurysm into the feeding vessel
Solution Approach 1:
The embolic device is divided into two separate segments: a first segment that forms a three-dimensional structure with a cavity, and a second segment that forms a smaller three-dimensional structure accommodated within the cavity. This segmentation allows each segment to perform specific functions - the first segment provides a scaffolding structure for stability, while the second segment provides additional occlusion material, together preventing migration while maintaining manageable complexity
Solution Approach 2:
The second segment's three-dimensional structure is designed to be accommodated within the cavity formed by the first segment's three-dimensional structure. This nested configuration maximizes the occlusion material within the aneurysm while maintaining a compact overall profile that prevents migration into the feeding vessel, resolving the contradiction between stability and device complexity
2Reliability
If the embolic device is designed with adequate size to fill the aneurysm, then occlusion efficacy is improved, but the device becomes too large to deliver through the catheter
Solution Approach 1:
The second segment is nested within the cavity of the first segment, allowing the device to be delivered in a compact configuration through the catheter. Upon deployment, the nested structure expands to provide adequate filling of the aneurysm for effective occlusion, thus resolving the contradiction between deliverability and occlusion efficacy
Solution Approach 2:
The device transitions from a compressed one-dimensional configuration during delivery through the catheter to a three-dimensional expanded structure within the aneurysm. This dimensional transformation allows the device to be delivered through small access points while still providing adequate volume for effective occlusion
Data Source
AI summary
An embolic device for placement in a body lumen, includes: a first segment having a first linear configuration when located inside a catheter, the first segment being configured to form a first three-dimensional structure when outside the catheter, wherein the first three-dimensional structure defines a cavity; and a second segment extending from the first segment, the second segment having a second linear configuration when located inside the catheter, the second segment being configured to form a second three-dimensional structure when outside the catheter; wherein the cavity of the first three-dimensional structure is configured to accommodate at least a majority of the second three-dimensional structure.