Intrasaccular Flow Diverter Dome Braid Aneurysm Conformity
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Solution Overview
Problem
Conventional intrasaccular flow diversion devices, such as the Woven EndoBridge (WEB) device, face challenges with inadequate occlusion due to non-conformity in shape between the device and the aneurysm, requiring multiple coils and risking recanalization due to shifting.
Innovation Solution
An improved intrasaccular flow diverter comprising a dome braid and an interior fill braid, where the dome braid is stiffer and deployable to conform to the aneurysm shape, and the interior fill braid is advanced to exert radial force for occlusion, allowing for a single device to fill and stabilize the aneurysm effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coils are used to pack the aneurysm, then the aneurysm can be occluded, but multiple coils are needed requiring additional time for implantation and the coils have a tendency to shift causing recanalization
Solution Approach 1:
The patent combines multiple coil functions into a single flow diverter device that provides both occlusion and stabilization. The flow diverter integrates the functions of multiple coils while adding structural support features that prevent shifting, thereby reducing implantation time and improving reliability.
Solution Approach 2:
The flow diverter is constructed from composite materials that provide both the flexibility needed for occlusion and the structural rigidity to maintain position. This composite structure eliminates the need for multiple separate coils while ensuring stable, long-term occlusion.
2Device complexity
If the Woven EndoBridge (WEB) device is used, then a single device can fill the aneurysm, but non-conformity of shapes between the spherical device and non-spherical aneurysm results in inadequate occlusion
Solution Approach 1:
The flow diverter is designed with dynamic characteristics that allow it to adapt its shape after deployment. The device can deform and conform to the specific geometry of the aneurysm sac, ensuring adequate contact and occlusion regardless of the aneurysm's shape, while maintaining a relatively simple spherical structure during delivery.
3Reliability
If multiple coils are used to pack the aneurysm, then occlusion can be achieved, but the procedure requires additional time and the coils may shift causing recanalization
Solution Approach 1:
The patent merges the functions of multiple coils into a single integrated flow diverter device. This unified structure provides both occlusion and positional stability, eliminating the need for multiple separate components while improving reliability.
4Reliability
If the dome braid has a stiffer profile, then it can maintain position in the aneurysm, but it may be difficult to advance through the delivery system
Solution Approach 1:
The dome braid is designed with dynamic mechanical properties that allow it to transition between a compressed low-profile state for delivery and an expanded stable state for occlusion. During delivery, the braid can be compressed to navigate the delivery system, and after deployment, it expands to provide stable positioning within the aneurysm.
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 device provides improved occlusion and stability, conforming to various aneurysm shapes and sizes, reducing the need for multiple coils and minimizing shifting, thus enhancing treatment efficacy.
Implementation Method 1
Subject to application of an external mechanical force, the dome braid is transitionable between an expanded state and a compressed state having a reduced overall diameter
Implementation Method 2
the interior fill braid is advanced therein. At that point, the delivery wire is released from the inverted proximal end of the interior fill braid allowing the interior fill braid to automatically transition to the expanded state interiorly exerting a force radially outward against the deployed dome braid
Implementation Method 3
Both the dome braid and interior fill braid are self-expanding braids
Data Source
AI summary
Intrasaccular flow diverter including: an interior fill braid physically inverted over itself forming a proximal inverted end and an opposite free end; and a dome braid disposed distally of and secured to the interior fill braid. Subject to application of an external mechanical force, the dome braid is transitionable between an expanded state and a compressed state. The dome braid has a proximal end with an opening defined therein through which starting at the free end the interior fill braid is passable therethrough exerting a radially outward force on the dome braid. A delivery wire is releasably detachable from the proximal inverted end of the interior fill braid. The dome braid has a stiffer profile relative to that of the interior fill braid to maintain in position within the aneurysm the dome braid as the interior fill braid is advanced therein.