Bow-Tie Vascular Remodeling Device for Aneurysm Neck Management
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Solution Overview
Problem
Current vascular remodeling devices are ineffective in treating aneurysms at bifurcations due to difficulties in preserving blood flow and preventing embolization coils from dislodging into parent vessels, especially when the neck ratio is less than 2:1 or greater than 4 mm.
Innovation Solution
A bow-tie shaped vascular remodeling device comprising two stents coupled at a midsection, which self-expands to conform to the bifurcation junction and neck of the aneurysm, acting as a scaffolding to inhibit dislodging of objects while allowing perfusion to efferent vessels, and can be deployed using a catheter with a plunger mechanism for mechanical, chemical, or electrolytic release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tubular remodeling devices are used to prevent coil dislodging, then coil stability is improved, but blood flow preservation through efferent vessels deteriorates
Solution Approach 1:
The remodeling device is divided into multiple segments including a first stent portion and a second stent portion that can be positioned in different locations. The first portion prevents coil dislodging at the aneurysm neck while the second portion extends into efferent vessels to preserve blood flow, allowing each segment to perform its specialized function independently
Solution Approach 2:
The device transitions from a simple tubular structure to a three-dimensional configuration with portions extending into different vascular directions. The stent portions are configured to extend into efferent vessels at specific angles, creating a spatial arrangement that simultaneously achieves coil containment and blood flow preservation through dimensional positioning
2Reliability
If the neck ratio is less than 2:1 or neck is greater than 4 mm, then coil embolization alone becomes difficult, but using tubular remodeling devices creates difficulty in shaping to preserve blood flow
Solution Approach 1:
The device is segmented into multiple stent portions that can be independently configured and positioned. This segmentation allows each portion to be optimized for specific functions - one portion for coil containment at the neck and other portions for blood flow preservation in efferent vessels - thereby reducing overall device complexity while maintaining effectiveness
Solution Approach 2:
The remodeling device is designed with multi-functional stent portions that can simultaneously perform coil containment, vessel support, and blood flow preservation. This universality eliminates the need for multiple separate devices or complex custom shaping, simplifying the overall treatment approach for aneurysms with challenging neck ratios
Data Source
AI summary
A vascular remodeling device and methods for its use are provided. The device can be positionable at a junction of a bifurcation having an aneurysm and that defines afferent and efferent vessels. Ends of the device can be at least partially inserted into the aneurysm or can anchor the device by being at least partially inserted into efferent vessels. The device can act as a scaffolding to inhibit dislodging of objects out of the aneurysm. The device can permit perfusion to the efferent vessels. Embolic material can be inserted in the aneurysm before, during, and/or after positioning the device.