Mesh Cap With Retention Arms for Aneurysm Neck Occlusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing procedures for treating vascular and cerebral outpouchings, such as aneurysms, are limited by the risk of device displacement, vessel damage, and increased permeability, particularly in wide-necked aneurysms, and the use of hydrogel can exacerbate these issues.
Innovation Solution
A self-expandable mesh occluder with retention arms, deployed across the neck of the outpouching, provides immediate stabilization and serves as a permanent embolic plug, minimizing displacement and vessel damage, and can engage with embolic coils or hydrogel for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coils are packed within the aneurysm using a single thread coil device, then the outpouching can be treated, but the risk of damaging the vessel and aneurysm walls increases
Solution Approach 1:
The patent introduces a stent as an intermediary structure that provides a scaffold for coil placement. The stent acts as a mediator between the coil device and the aneurysm wall, distributing mechanical stresses and preventing direct contact between the coils and the vulnerable aneurysm wall, thereby reducing the risk of damage while maintaining treatment effectiveness
Solution Approach 2:
The stent is deployed beforehand to create a protective barrier and structural support before coil packing is performed. This prior cushioning structure prevents the coils from directly impacting the aneurysm wall during the embolization process, reducing the risk of vessel and aneurysm wall damage
2Stability of the object's composition
If a stent is used as a buttress to retain coils within the aneurysmal sac, then coil retention is improved, but the potential for damage to surrounding blood vessels increases and antiplatelet therapy is required
Solution Approach 1:
The patent designs the stent with varying structural properties at different locations - the proximal and distal ends have different configurations to provide localized support where needed while minimizing interference with surrounding vessels. This local quality approach allows effective coil retention without unnecessarily increasing the risk to adjacent blood vessels
Solution Approach 2:
The stent is constructed from flexible materials that can conform to the anatomy of the aneurysm and surrounding vessels. This flexibility allows the stent to provide necessary structural support for coil retention while adapting to the vascular geometry, thereby reducing the potential for damage to surrounding blood vessels
3Ease of operation
If self-expanding coils are used, then the procedure is simplified, but the permeability of blood across the neck is not decreased resulting in coil compaction and recurrence
Solution Approach 1:
The patent combines self-expanding coils with a stent structure into an integrated device. The stent provides the structural framework that prevents coil compaction and maintains permeability reduction, while the self-expanding coils provide the embolization function. This merging allows procedural simplicity to be maintained while eliminating the deficiencies of using self-expanding coils alone
4Reliability
If multiple embolic coils are used to fill the outpouching, then the occlusion is more effective, but the procedural time and device complexity increase
Solution Approach 1:
The stent is deployed as a preliminary action before coil packing, establishing the structural framework and retention mechanism in advance. This preliminary action simplifies subsequent coil placement and reduces the number of coils needed to achieve effective occlusion, thereby reducing overall procedural time while maintaining occlusion effectiveness
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 mesh occluder effectively secures the device in place, reducing the need for multiple embolic coils and minimizing the risk of aneurysm rupture, while providing immediate stabilization and reducing procedural time and vessel damage.
Implementation Method 1
flexible material, such as wire comprised of, for example, shape memory material including metals and polymers
Implementation Method 2
super-elastic materials, spring material
Data Source
AI summary
A self-expandable occluding device can both cover the neck of an outpouching and serve as a permanent embolic plug thereby immediately stabilizing the outpouching. The self-expandable device effectively covers the neck of an outpouching with, for example, a mesh, or other at least partially occluding component, in a desired orientation across the neck of the outpouching without projecting into the parent vessel. The device incorporates elements which immediately stabilize the device in the outpouching, in effect, functioning as a permanent embolic plug. An embolic disc is combined with retention arms of flexible material, which deploy within the outpouching and provide immediate stabilization thereby retaining the occluding component or mesh across the neck of the outpouching. In illustrative embodiments, the arms are in the form of coils configured to deploy into three dimensional structures.