Two-Part Intrasaccular Aneurysm Occlusion Device
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Solution Overview
Problem
Current methods for treating cerebral aneurysms are inadequate, as they often fail to effectively occlude the aneurysm, leading to rupture and severe health consequences, and existing devices may not securely adhere to irregularly shaped aneurysm sacs.
Innovation Solution
A two-part intrasaccular device is formed from a tubular mesh, where the proximal portion is radially constrained to collapse into a concave shape, and the distal portion is expanded within the aneurysm sac using embolic members or material, securely holding the device against the aneurysm neck and conforming to irregular shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-part mesh device is used for aneurysm occlusion, then the device structure is simple, but the device cannot securely adhere to irregularly shaped aneurysm sacs
Solution Approach 1:
The mesh device is divided into two distinct parts: a proximal portion and a distal portion. The proximal portion is radially constrained to form a complementary shape to the aneurysm sac, while the distal portion is expanded within the aneurysm sac. This segmentation allows each part to perform its specific function optimally, with the proximal portion providing secure adherence and the distal portion providing effective occlusion.
2Ease of operation
If existing occlusion methods are used, then the treatment process is simple, but the aneurysm is not effectively occluded leading to rupture risk
Solution Approach 1:
The distal portion of the mesh device is nested within the aneurysm sac, while the proximal portion extends outward to cover the aneurysm neck. This nested configuration allows the device to effectively occlude the aneurysm by blocking blood flow at the neck while filling the sac, providing reliable occlusion without significantly complicating the treatment process.
3Adaptability or versatility
If a radially constrained proximal portion is collapsed into a concave shape, then the device can conform to irregular aneurysm shapes, but the device complexity increases
Solution Approach 1:
The proximal portion of the mesh device is radially constrained to form an asymmetric concave shape that complements the irregular geometry of the aneurysm sac. This asymmetric configuration allows the device to adapt to various irregular aneurysm shapes while maintaining structural integrity and secure adherence.
Data Source
AI summary
This invention can be embodied in a method and device for therapeutically-occluding a cerebral aneurysm. A method embodiment includes radially-constraining a tubular mesh to form proximal and distal convex portions of the mesh, collapsing the proximal portion into a concave (e.g. bowl) shape, and expanding the distal portion of the mesh within an aneurysm sac by filling it with embolic members and/or material. The expanded distal portion of the mesh holds the concave proximal portion securely against the aneurysm neck and conforms to the wall contours of even an irregularly-shaped aneurysm sac.