Vessel-Engaging Member with Alternating Strut Patterns for Aneurysm Bridging
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Solution Overview
Problem
Current stents and vasooclusive devices face issues such as ovalization in tortuous anatomical lumens, herniation into aneurysms, and difficulty in maintaining embolic material within the aneurysm, leading to complications like arterial occlusion and stroke.
Innovation Solution
A medical device with a vessel-engaging member featuring alternating rows of struts, single bridges, and double bridges that expand to securely bridge the aneurysm neck, preventing herniation and allowing for embolic material insertion, while being designed for improved trackability and deployment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tubular neck remodeling devices are used to prevent coil dislodging, then reliability is improved, but device complexity increases
Solution Approach 1:
The stent structure is divided into multiple rows of struts with alternating patterns, where first rows have first patterns and second rows have second patterns. This segmentation allows different regions to perform specialized functions while maintaining overall device simplicity.
Solution Approach 2:
Different rows of struts are configured with different patterns to create local variations in mechanical properties. The alternating patterns provide different degrees of flexibility and support at different locations, optimizing both coil retention and device simplicity in specific regions.
2Reliability
If stents are used to bridge aneurysm neck, then reliability is improved, but ovalization occurs in tortuous lumens
Solution Approach 1:
The stent is designed with dynamic characteristics through alternating strut patterns that allow controlled deformation. The structure can adapt its shape to accommodate tortuous lumens while maintaining sufficient rigidity to bridge the aneurysm neck effectively.
Solution Approach 2:
The alternating strut patterns create variations in local mechanical parameters such as flexibility and radial strength. This allows the stent to change its physical parameters dynamically, becoming more compliant in tortuous sections while maintaining structural integrity at the aneurysm neck.
3Device complexity
If embolization coils are used alone in wide-neck aneurysms, then simplicity is maintained, but herniation into parent vessels occurs
Solution Approach 1:
The stent acts as an intermediary device between the embolization coils and the parent vessel. It provides a scaffold that allows coils to be safely placed in wide-neck aneurysms without direct coil-vessel interaction that would cause herniation, thus maintaining treatment simplicity while improving reliability.
Data Source
AI summary
A medical device, for insertion into an anatomical vessel, can include a sheath, a delivery wire, and a frame or vessel-engaging member. The delivery wire can have a first stop, a second stop, and a coupling area between the first and second stops. The coupling area can be disposed within and movable relative to the sheath. The frame or vessel-engaging member can have a matrix of cells, first and second tapered sections, and interlocking members. The interlocking members can be attached to the tapered sections. The interlocking members can be releasably coupled to the delivery wire at the coupling area with the interlocking members surrounded and held in the coupling area by the sheath. The interlocking members can be movable relative to the sheath, and the interlocking members can separate from each other when the interlocking members are positioned distal to the sheath.