Expandable Braided Vaso-occlusive Device for Aneurysm Occlusion
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Solution Overview
Problem
Current vaso-occlusive devices for treating aneurysms, such as coils and stents, are difficult to position and remove, pose a risk of migration, and are less effective for larger aneurysms due to their limited expandability and length, leading to longer and more complex procedures.
Innovation Solution
Development of pushable and retrievable vaso-occlusive devices with a soft, expandable braid attached to a pushable coil, allowing for precise placement and retrieval, featuring a braided tubular member that expands to a diameter greater than 1.5 times the coil diameter, and incorporating friction elements for enhanced stability and deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If small and relatively thin coils are used to fill aneurysms, then the device can be pushed and retrieved through catheters, but the coils are less effective for larger aneurysms and may slip back out, requiring longer and more involved procedures
Solution Approach 1:
The device is divided into two functional segments: a pushable metal coil core and an expandable braid member. The coil provides the pushable structure for delivery, while the braid provides the expandable occlusion structure. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The braid member transitions from a compressed state during delivery to an expanded state at the deployment site. This dynamic transformation allows the device to be pushed through catheters in a compact form and then expand to fill larger aneurysms effectively, preventing coil slippage while maintaining ease of delivery.
2Reliability
If multiple individual spring shaped coils are used to fill larger aneurysms, then occlusion effectiveness is improved, but the procedure becomes longer and more complicated
Solution Approach 1:
Multiple coil functions are merged into a single device by combining the metal coil core with the expandable braid member. This unified structure provides the occlusion effectiveness of multiple coils while being delivered and deployed as a single unit, significantly reducing procedure time and complexity.
Solution Approach 2:
The braid member is pre-formed and attached to the coil core before delivery. This preliminary preparation allows the device to be deployed as a complete occlusion structure in one action, eliminating the need to sequentially place multiple individual coils during the procedure.
3Reliability
If the braid is made very long and highly expandable to treat larger aneurysms, then occlusion effectiveness is improved, but the device becomes difficult or impossible to push and retrieve
Solution Approach 1:
The device separates the pushable function (metal coil core) from the expandable function (braid member). This allows the braid to be made long and highly expandable for effective occlusion while the compact coil core maintains pushability through catheters.
Solution Approach 2:
The braid member acts as a flexible structure that can be compressed into a compact form for delivery and then expanded to a large diameter for occlusion. This flexible transformation allows long, highly expandable braids to be pushed and retrieved without compromising their occlusion capability.
Data Source
AI summary
Vaso-occlusive apparatuses, including implants, and methods of using them to treat aneurysms. For example, described herein are expandable vaso-occlusive implants that include one or more soft and expandable braided member coupled to a pushable member such as a coil that maybe inserted and retrieved from within an aneurism using a delivery catheter. In particular, the expandable implants described herein are configured to allow relatively soft and elongate implants to be pushed out of a cannula without binding up within the cannula.