Spiral Stent Shape Setting for Adjustable Aneurysm Occlusion
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Solution Overview
Problem
Traditional flow diversion stents are stiff and fixed in shape, making deployment difficult in tortuous anatomy and not repositionable, while intrasaccular occlusion devices struggle to adequately occlude aneurysms and cover the neck, and traditional medical devices lack post-deployment shape adjustment.
Innovation Solution
A stent with a spiral shape and a shape setting structure composed of metallic wires that can be adjusted post-deployment through heat treatment, allowing it to function as both a flow diverter and occlusive device, with multi-layer spiral configurations for enhanced blood flow disruption and occlusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional flow diversion stents use a fixed tubular structure, then the stent provides consistent low porosity profile, but the stent becomes stiff and difficult to deploy in tortuous anatomy
Solution Approach 1:
The stent transitions from a static fixed tubular structure to a dynamic reconfigurable structure that can change its shape and porosity profile after deployment. The stent initially deploys as a low porosity flow diverter and can later be reconfigured to a high porosity occlusion device, allowing both deployment ease and treatment effectiveness.
Solution Approach 2:
The stent's porosity parameter is changed from fixed to variable. The stent can transition between low porosity state (for flow diversion) and high porosity state (for occlusion), enabling the same device to provide different therapeutic effects based on treatment needs.
2Manufacturing precision
If traditional flow diversion stents have a fixed size, then the stent can be precisely sized for the target location, but the stent cannot be repositioned after deployment
Solution Approach 1:
The stent incorporates a mechanical linkage system that remains engaged after deployment, allowing the stent to be repositioned dynamically. The pusher maintains connection to the stent through the delivery catheter, enabling adjustment of stent position while preserving the ability to reposition if needed.
3Reliability
If intrasaccular occlusion devices use a fixed shape structure, then the device can occupy aneurysm space, but the device struggles to adequately cover the neck
Solution Approach 1:
The stent is designed to perform multiple functions: it can act as a flow diverter with low porosity profile, or be reconfigured as an occlusion device with high porosity profile. This multi-functionality allows the same device to address both aneurysm occlusion and neck coverage requirements.
Solution Approach 2:
The stent's porosity parameter is changed from fixed to variable. The stent can transition between low porosity state (for flow diversion) and high porosity state (for occlusion), enabling the same device to provide different therapeutic effects based on treatment needs.
4Stability of the object's composition
If traditional medical devices have a fixed heat set shape, then the device maintains structural stability, but the device cannot be adjusted post-deployment
Solution Approach 1:
The stent incorporates a shape setting structure with metallic wires that can be heated to change the stent's shape after deployment. This allows the stent to transition between different configurations (low porosity flow diverter to high porosity occlusion device) while maintaining structural stability through controlled thermal activation.
Solution Approach 2:
The shape setting structure utilizes phase transition of metallic wires through heating. When heated, the wires change phase/state to enable shape reconfiguration of the stent, allowing post-deployment adjustment while maintaining structural integrity.
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 spiral stent provides flexible deployment, effective blood flow diversion, and adjustable occlusion, addressing deployment challenges and enhancing treatment efficacy in aneurysms.
Implementation Method 1
A stent with a spiral shape and a shape setting structure composed of metallic wires that can be adjusted post-deployment through heat treatment
Data Source
AI summary
A medical device is disclosed and may have a spiral shape structure that can function as a stent, such as a flow diversion stent to treat aneurysms. The medical device may have a spiral shape structure that can function as an occlusive device, for instance to occlude aneurysms. The medical device may include a shape setting structure to selectively adjust the shape of the medical device.