Self-Expanding Coil Arms for Aneurysm Stabilization
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Solution Overview
Problem
Current endovascular devices struggle with stabilizing wide-necked outpouchings, such as aneurysms, due to displacement issues and the need for invasive stent placement, which increases morbidity and risks, and the use of hydrogel can exacerbate medical difficulties with uneven swelling and delivery challenges.
Innovation Solution
A self-expandable outpouching-filling device with a mesh disc and self-expanding coil arms made of memory material, which deploys into a three-dimensional configuration to securely grip the aneurysmal wall, providing immediate stabilization and acting as a permanent embolic plug, without projecting into the parent vessel, and optionally includes hydrogel for on-demand expansion and shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-expanding coil arms are added to the mesh disc, then stabilization capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the mesh disc and self-expanding coil arms into a single integrated device unit. The coil arms are attached to the mesh disc such that they expand simultaneously with the disc deployment, creating a unified stabilization system that functions as one cohesive device rather than separate components.
Solution Approach 2:
The mesh disc with attached coil arms is nested within a delivery catheter in a compressed state during delivery. Upon deployment, the disc and coil arms expand together from the catheter, with the coil arms nesting against the disc structure during the compression phase and then expanding outward to provide stabilization.
2Reliability
If the device is designed to grip the aneurysmal wall, then retention is improved, but risk of trauma increases
Solution Approach 1:
The coil arms are designed with varying properties along their length, with the distal portions having softer, more compliant characteristics for gentle contact with the aneurysmal wall, while the proximal portions near the mesh disc provide stronger structural support and gripping force. This gradient in mechanical properties allows effective retention while minimizing trauma risk.
Solution Approach 2:
The self-expanding coil arms provide dynamic adaptation to the aneurysmal wall geometry. As the device expands, the coil arms flex and conform to the irregular surface of the aneurysm, maintaining constant gentle pressure for retention without exerting excessive force that could cause trauma. The dynamic flexibility allows the device to accommodate variations in wall thickness and elasticity.
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 achieves immediate and effective stabilization of the mesh disc at the outpouching neck, reducing the risk of displacement and trauma, and allows for precise positioning, thereby enhancing treatment efficacy and safety by maintaining the device's position during embolic material deployment.
Implementation Method 1
self-expanding coil arms made of memory material, which deploys into a three-dimensional configuration to securely grip the aneurysmal wall
Implementation Method 2
self-expandable outpouching-filling device with a mesh disc and self-expanding coil arms
Implementation Method 3
providing immediate stabilization and acting as a permanent embolic plug
Data Source
AI summary
An embolic device for ameliorating outpouchings, comprising a control element, a catheter element, a delivery microcatheter hypotube, a detachment element, a mesh disc, a distal opening and at least one attached extension arm, wherein said mesh disc further comprises a proximal face and a distal face, said proximal face being opposite of said distal face that are substantially flat. The mesh disc further comprises peripheral lips and a core having a diameter configured to be smaller than the target outpouching, the mesh disc being secured in place by at least one attached extension arm.