Aneurysm Stent With Selective Membrane Occlusion
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Solution Overview
Problem
Current aneurysm stents lack effective solutions for reducing blood permeability at the aneurysm neck, which is crucial for preventing aneurysm rupture and ensuring unhindered blood supply to surrounding tissues, and they often require complex implantation procedures and lack adequate visibility during X-ray monitoring.
Innovation Solution
An aneurysm stent system with membranes integrated into stent cells to reduce or eliminate blood permeability, allowing for controlled blood flow and thrombogenesis, featuring a self-expanding design with X-ray-visible materials for enhanced visibility and simplified implantation, and the ability to be filled with medications for sustained release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If membranes are integrated into stent cells to reduce blood permeability, then aneurysm rupture prevention is improved, but device complexity increases
Solution Approach 1:
The patent applies thin film membranes to cover specific stent cells, creating a selective barrier that reduces blood permeability at the aneurysm neck while maintaining the overall stent structure. The membranes are integrated into the stent framework, providing targeted occlusion without requiring complete stent coverage, thus balancing reliability improvement with acceptable device complexity.
2Reliability
If membranes are added to reduce blood permeability, then thrombogenesis is promoted, but manufacturing complexity increases
Solution Approach 1:
The patent implements membranes only in specific stent cells located at the aneurysm neck region, rather than covering the entire stent structure. This localized approach promotes thrombogenesis where needed while minimizing the manufacturing complexity associated with producing and attaching membranes to all stent cells, thereby improving ease of manufacture while maintaining therapeutic effectiveness.
3Difficulty of detecting and measuring
If X-ray visible materials are used in membranes, then visibility during implantation is improved, but material selection constraints increase
Solution Approach 1:
The patent employs composite material structures where X-ray visible materials (such as platinum or barium sulfate) are integrated into the membrane construction. This allows the membranes to maintain their blood permeability reduction function while providing adequate radiopacity for imaging during implantation and positioning, resolving the contradiction between visibility improvement and material selection flexibility.
4Ease of operation
If self-expanding design is implemented, then implantation procedure is simplified, but control over expansion timing is reduced
Solution Approach 1:
The patent utilizes self-expanding stent technology where the stent framework inherently returns to its predetermined expanded configuration after deployment from the delivery catheter. This eliminates the need for complex external expansion control mechanisms, simplifying the implantation procedure while relying on the elastic memory properties of the stent material to achieve automatic expansion and membrane positioning.
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 stent system effectively limits blood flow into the aneurysm, promoting thrombogenesis and preventing rupture while ensuring adequate blood supply to surrounding tissues, with improved visibility and ease of implantation due to its X-ray-visible materials and self-expanding properties.
Implementation Method 1
The membrane reduces or eliminates the blood permeability of the stent cell in the radial direction of the stent
Implementation Method 2
The entire stent system is compressible to allow it to be inserted into an insertion system. The stent system is preferably self-expanding so that the system automatically expands when taken out of the insertion system.
Data Source
AI summary
The present invention relates to an aneurysm stent for implantation into a living body, in particular for treatment of aneurysms, in order to implant the stent in the compressed state in a vessel and expand the stent after positioning it in the vessel, having a grid or mesh structure and at least one membrane (2) or a plurality of membranes (2) for covering at least one or more stent cells (1; 3) in the grid or mesh structure, thereby matching the permeation characteristics of the stent structure to the particular characteristics of the aneurysm.