Neurovascular Flow Diverter Delivery via Nested Core Wire
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current treatments for cerebral aneurysms are challenging due to the complex neural vasculature and risks associated with subarachnoid hemorrhage, particularly in treating small and tortuous blood vessels near branching points, where existing technologies face difficulties in precise placement and risk of vessel damage.
Innovation Solution
A system and method for delivering a flow diverter into a neurovascular blood vessel using a core wire with deployment features like pushers, friction bumps, and self-expanding elements, which allows for precise deployment and expansion within the vessel, reducing the risk of damage and enabling treatment of previously inaccessible areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing delivery systems are used to treat cerebral aneurysms in small and tortuous blood vessels, then treatment of accessible aneurysms can be performed, but precise placement and risk of vessel damage increase in previously untreatable portions of the neurovasculature
Solution Approach 1:
The delivery system is segmented into modular components: a catheter for navigation, a separate flow diverter device for deployment, and a core wire that terminates within the flow diverter rather than extending beyond it. This segmentation allows the system to adapt to complex vascular anatomy while containing potentially harmful elements within safe boundaries.
Solution Approach 2:
The flow diverter is nested within the catheter during delivery, and the core wire is nested within the flow diverter structure. This nested configuration enables the system to navigate tortuous vessels through the catheter while the contained core wire prevents damage to surrounding vasculature, even in previously untreatable portions of the neurovasculature.
2Ease of operation
If a core wire extends beyond the flow diverter for deployment control, then deployment control is improved, but the risk of damage to neurovascular vessels increases
Solution Approach 1:
The potentially harmful extension of the core wire beyond the flow diverter is extracted/removed. The core wire terminates within the flow diverter structure, eliminating the source of potential vessel damage while deployment control is maintained through alternative mechanisms such as friction bumps and pushers that are contained within the safe boundary of the flow diverter.
Solution Approach 2:
Friction bumps and pushers serve as intermediary elements between the core wire and the flow diverter. These intermediaries provide the necessary deployment control and force transmission without requiring the core wire to extend beyond the flow diverter, thus maintaining ease of operation while eliminating the harmful effect of exposed core wire.
3Ease of operation
If friction bumps are placed on the core wire to engage the flow diverter, then deployment control is improved, but the complexity of the delivery system increases
Solution Approach 1:
Friction bumps are placed locally at specific positions on the core wire where engagement with the flow diverter is needed, rather than uniformly distributing complexity throughout the entire system. This localized approach provides effective deployment control while minimizing overall system complexity by concentrating functional elements only where necessary.
Data Source
AI summary
Neurovascular flow diverter and delivery systems, and methods of using the same are disclosed herein. The systems can include an introducer sheath, a catheter, a deployable flow diverter that can be contained in the introducer sheath or in the catheter, a core wire that extends into and terminates in the flow diverter, and one or several deployment features coupled to the core wire and engaging the flow diverter. The deployment features can include one or more of a pusher, one or several friction bumps, one or several deployment coils, a claw mechanism, a self-expanding element, a supporting coil, a tip coil, and/or an atraumatic tip. One or more of the deployment features can be radiopaque.