Aneurysm Stent Separation Zone Angles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current treatments for bifurcation aneurysms, particularly those with wide necks, face challenges as traditional occlusive coils can be dislodged and cause damage elsewhere in the vascular system, and existing stent structures are inadequate for creating a 'latticework' at the aneurysm entrance to prevent coil migration.
Innovation Solution
A mesh structure implant with sections that include a fixing section for vessel wall support, a permeable section for bifurcations, and a radially expanded distal section with a separation zone that partially closes the aneurysm neck, featuring loops forming angles between -45° and +175° and a membrane to retain occlusion devices, potentially eliminating the need for additional occlusion devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional occlusive coils are used to fill the aneurysm, then the aneurysm can be sealed, but the coils can be dislodged and flushed out into other areas of the vascular system causing damage
Solution Approach 1:
The patent introduces a stent as an intermediary device that acts as a barrier between the occlusive coils and the vascular system. The stent's mesh structure physically contains the coils within the aneurysm sac while allowing blood flow through the vessel, preventing coil migration into circulation.
Solution Approach 2:
The stent is divided into multiple sections with different mesh sizes: a proximal section with smaller mesh for vessel wall support, a middle section with larger mesh for bifurcation coverage, and a distal section for aneurysm filling. This segmentation allows each zone to perform its specific function optimally.
2Reliability
If a stent with wide-meshed wall is used to bar the aneurysm opening, then coil migration is prevented, but the stent structure is inadequate for creating effective latticework at the aneurysm entrance
Solution Approach 1:
The stent implements local quality by providing different mesh sizes in different sections: the proximal section has smaller mesh for structural support and vessel wall apposition, while the middle and distal sections have larger mesh for effective coil retention and bifurcation coverage, creating optimal latticework where needed.
Solution Approach 2:
The stent employs shape memory alloy material that allows it to be compressed into a delivery catheter for minimally invasive insertion, then dynamically expands to its final configuration at the implantation site, transitioning from a compact delivery state to a functional expanded state.
3Reliability
If the implant is radially expanded to effectively bar the aneurysm entrance, then the separation zone can retain occlusion devices, but the implant must be flexible enough for insertion into complex bifurcation anatomy
Solution Approach 1:
The stent utilizes changes in physical parameters - specifically, the shape memory alloy's ability to transition between compressed and expanded states through temperature or mechanical activation. This allows the stent to be inserted in a flexible compressed state and then expand to a rigid structure that effectively bars the aneurysm entrance.
Solution Approach 2:
The stent is designed to be nested within the delivery catheter during insertion, with the compressed stent fitting inside the catheter lumen. Once positioned, the stent expands outward from the catheter, maintaining a compact profile during delivery while achieving full radial expansion for aneurysm coverage.
Data Source
Figure 1~4(d)
Figure 3a(a)~3a(d)
Figure 3b
AI summary
The invention relates to an implant for use in the occlusion of aneurysms in the region of vascular ramifications, in particular bifurcation aneurysms (A). The implant has a mesh structure (3, 4) and comprises, from a proximal end to a distal end, a fastening segment (b), by means of which the implant can be supported on a vessel wand, a permeable segment (c) for the region of the vascular ramification, and a distal segment (d), in which the implant is radially expanded in relation to segment (b) and which is intended to be placed in the aneurysm (A). In the region of segment (c) or (d), a separating zone (T1, T2), is arranged, which at least partially closes the throat of the aneurysm, wherein the distal segment (d) has a plurality of filaments and/or loops (12) connected to segment (c) and the filaments/loops (12) form an angle between -45° and +175° to the longitudinal axis of the implant (1), wherein a positive angle stands for filaments/loops pointing radially outward and a negative angle stands for filaments/loops (12) pointing radially inward. Alternatively, the distal segment (d) can also be expanded in the shape of a sphere, mushroom, anchor, or ellipsoid.