Self-Expandable Catheter for Cerebral Vessel Occlusion
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Solution Overview
Problem
Conventional devices for protecting cerebral vessels during carotid artery treatment require large diameters and complex inflation lumens, making them cumbersome and difficult to maneuver, especially in the limited space of the carotid arteries, and often necessitate multiple steps for occlusion and flow reversal, which can dislodge particulate matter and pose risks.
Innovation Solution
A catheter with self-expandable areas that can transition between collapsed and expanded states using a removable elongate stretching member, allowing for simultaneous occlusion of vessels without the need for inflation lumens, enabling a single-step deployment and rapid reversal of blood flow, while maintaining a small profile for easier handling and imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filter devices are used to protect cerebral vessels, then particle blockage is prevented, but the device diameter becomes large and maneuverability is reduced
Solution Approach 1:
The catheter is divided into multiple expandable areas (first, second, and third expandable areas) that can be independently or simultaneously expanded. This segmentation allows the device to maintain a small collapsed profile for easy delivery while expanding to provide adequate filtration and occlusion functions at the target site.
Solution Approach 2:
The catheter employs dynamically expandable areas that transition from a collapsed low-profile state during delivery to an expanded functional state at the target site. This dynamic transformation enables the device to overcome the size contradiction by being small during insertion and large when needed for particle blockage prevention.
2Adaptability or versatility
If multiple inflation lumens are incorporated for occlusion and flow reversal, then vessel occlusion capability is improved, but device complexity increases
Solution Approach 1:
The expandable areas serve multiple functions: they can occlude vessels, create flow reversal, and provide filtration. By making the expandable areas multi-functional, the device eliminates the need for separate inflation lumens and components, thereby reducing complexity while maintaining versatile vessel occlusion and flow reversal capabilities.
Solution Approach 2:
The patent combines the functions of multiple inflation lumens and occlusion balloons into a single integrated expandable area system. The first, second, and third expandable areas work together as a unified structure that can perform both occlusion and flow reversal functions, simplifying the overall device architecture.
3Ease of operation
If multiple steps are used for occlusion and flow reversal, then procedural control is improved, but the risk of particulate matter dislodgment increases
Solution Approach 1:
The catheter is pre-configured with multiple expandable areas that can be simultaneously or sequentially activated. This preliminary configuration allows for controlled expansion that minimizes sudden movements and particulate dislodgment, while still providing the procedural control needed for safe occlusion and flow reversal.
Solution Approach 2:
The expandable areas provide continuous occlusion and flow reversal functionality without requiring multiple discrete steps. The ability to maintain sustained expansion creates a continuous protective environment that prevents particulate matter migration while simplifying the procedural workflow.
4Reliability
If larger devices are used for cerebral vessel protection, then filtration capability is improved, but handling and imaging become more difficult
Solution Approach 1:
The catheter dynamically changes its profile from a small collapsed state during delivery and imaging to a larger expanded state when filtration is needed. This dynamic transformation allows the device to be easily handled and imaged in its compact form while providing adequate filtration capability when deployed.
Solution Approach 2:
The filtration function is distributed across multiple expandable areas that can be selectively expanded. This segmentation allows the device to maintain a small overall profile for easy handling and imaging while providing sufficient filtration surface area when the expandable areas are activated at the target site.
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 solution provides effective occlusion of cerebral vessels with reduced risk of particulate matter dislodgment, allows for rapid intervention, and facilitates the use of smaller devices with a single guidewire, enabling efficient treatment while maintaining procedural imaging capabilities.
Implementation Method 1
a catheter with self-expandable areas that can transition between collapsed and expanded states
Data Source
AI summary
A device for protecting cerebral vessels or brain tissue during treatment of a carotid vessel includes a catheter having a distal portion, a proximal portion and a lumen extending therebetween, the catheter including first and second expandable areas for vessel occlusion provided over the length of the catheter. The device further includes an elongate stretching member insertable longitudinally through the lumen of the catheter, the elongate stretching member being configured for stretching at least a portion of the catheter and causing the first and second expandable areas to transition from an expanded state to a collapsed state, and wherein the elongate stretching member is retracted proximally relative to the catheter causes the first and second expandable areas to transition from the collapsed state to a radially, or laterally expanded state.