Segmented Braided Embolic Occlusion Device for Stable Aneurysm Filling
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Solution Overview
Problem
Conventional embolic coils are limited in their ability to fill the volume of intracranial aneurysms, leading to unstable clots due to early blockage of the aneurysm neck, flow channels, and fibrin turnover, necessitating retreatment, and larger devices complicate delivery.
Innovation Solution
An occlusion device featuring a tubular braided member with alternating larger and smaller diameter portions and a metallic coil member coaxially arranged, allowing for improved volumetric filling and stability within the aneurysm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional embolic coils are used to fill aneurysms, then the aneurysm neck can be blocked, but the volume filling is limited to about 35% and clot stability is compromised
Solution Approach 1:
The occlusion device is divided into multiple segments: a tubular braided member with alternating larger and smaller diameter portions, and multiple metallic coil members positioned within the smaller diameter portions. This segmentation allows the device to fill more aneurysm volume while maintaining clot stability through distributed coil placement rather than a single large coil that would block the neck too early.
Solution Approach 2:
The metallic coil members are nested within the tubular braided member structure. The coils are positioned inside the smaller diameter portions of the braided member, creating a nested configuration that maximizes space utilization within the aneurysm cavity while maintaining structural integrity and preventing early neck blockage.
2Volume of moving object
If larger coil diameters or attached hydro gels are used to increase volume filling, then more aneurysm space can be occupied, but delivery through microcatheters becomes complicated
Solution Approach 1:
The tubular braided member is designed with dynamic characteristics that allow it to be compressed into a small profile for delivery through microcatheters and then expand to its larger functional configuration once deployed in the aneurysm. The alternating diameter portions provide flexibility and compressibility while maintaining the ability to occupy large aneurysm volume when expanded.
3Volume of moving object
If multiple coils are packed into the aneurysm to increase volume filling, then more space can be occupied, but the passage of subsequent coils is inhibited by early blockage
Solution Approach 1:
The device is pre-configured with multiple metallic coil members already positioned within the tubular braided member at specific intervals. This preliminary arrangement ensures that when the device is deployed, multiple coils are simultaneously or sequentially released without requiring manual packing, thereby filling more volume while avoiding the early blockage problem that occurs when coils are packed one after another.
Data Source
AI summary
An occlusion device including a tubular braided member having a first end and a second end and extending along a longitudinal axis, the tubular braided member having a repeating pattern of larger diameter portions and smaller diameter portions arrayed along the longitudinal axis, and at least one metallic coil member extending coaxially along at least a portion of the braided member, the at least one metallic coil member having an outer diameter and an inner diameter, wherein the smaller diameter portions of the tubular braided member have an outer diameter and an inner diameter, and wherein at least one of the outer diameter and inner diameter of the tubular braided member is configured to closely match a directly opposing diameter of the metallic coil member.