Neurointervention.  2021 Jul;16(2):122-131. 10.5469/neuroint.2021.00199.

Endovascular Treatment of Intracranial Aneurysms Using the Novel Low Profile Visualized Intraluminal Support EVO Stent: Multicenter Early Feasibility Experience

• Foo M
• Maingard J
• Hall J
• Ren Y
• Mitreski G
• Slater LA
• Chandra R
• Chong W
• Jhamb A
• Russell J
• Kok HK
• Brooks M
• Asadi H

• KMID: 2517737
• DOI: http://doi.org/10.5469/neuroint.2021.00199

Abstract

Purpose
Low-profile, self-expandable stents have broadened therapeutic options available for definitive treatment of intracranial aneurysms. The novel Low-Profile Visualized Intraluminal Support (LVIS) EVO stent extends upon the success of its predecessor, the LVIS Jr stent, aiming to enable higher visibility and greater opening ability within a self-expandable and fully retrievable microstent system. In this study, we aim to report the early safety and feasibility experience with the LVIS EVO stent.
Materials and Methods
A multicenter, retrospective, observational study was conducted on patients who had intracranial aneurysms treated with the LVIS EVO stent across 3 Australian neurovascular centers between February 2020 and September 2020. Short-term technical and clinical outcomes were evaluated.
Results
A total of 22 LVIS EVO stents were successfully implanted to treat 15 aneurysms (3 ruptured, 12 unruptured) in 15 patients. Aneurysms ranged from 2 mm to 35 mm in dome height. The LVIS EVO stent was used for stent-assisted coiling in 11 patients and flow diversion in 4 patients. There were no device-related procedural complications. There were 2 cases of peri-procedural symptomatic thromboembolic complications and no procedure-related mortality. At early radiological follow up, 10 patients had complete occlusion, 4 patients had small neck remnants, and 1 patient who was managed with flow diversion had a residual aneurysm.
Conclusion
Early experience with the LVIS EVO stent demonstrated safety and feasibility for stent-assisted coiling as well as flow diversion for intracranial aneurysms. In this heterogeneous cohort, including ruptured, complex, and large aneurysms, all cases were technically successful.

Keyword

Intracranial aneurysm; Endovascular techniques; Interventional radiology instrumentation; Neuroimaging

Figure

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  Fig. 1. Drawn-filled tube wire technology of the Low-Profile Visualized Intraluminal Support (LVIS) EVO device (A), allowing radio-opacity of the entire length of the stent body, as compared to the pure nitinol wires used in LVIS and LVIS Jr (B). (C) Visual comparison between LVIS, LVIS Jr, and LVIS EVO stents.

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  Fig. 2. Semi-jailing double microcatheter technique. (A) The first microcatheter is positioned with its tip in the aneurysm sac. (B) A second microcatheter is used to partially deploy the stent across the aneurysm neck, securing the first microcatheter between the stent and the vessel wall. (C) The stent is fully deployed after dense coil packing.

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  Fig. 3. Case 9. (A) Microcatheter tip near the base of a small aneurysm arising from a tortuous right P3 segment. (B) The Low-Profile Visualized Intraluminal Support (LVIS) EVO stent was easily and successfully deployed as a flow-diverting stent within an Acclino flex plus stent, achieving significant slowing of inflow into the aneurysmal sac on final angiographic run (C).

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  Fig. 4. Low-Profile Visualized Intraluminal Support (LVIS) EVO-assisted coiling of an unruptured right supraclinoid internal carotid artery (ICA) aneurysm. (A) Frontal projection DSA with contrast injection in the right cavernous ICA. (B) LVIS EVO device amid deployment, with radiopaque delivery tip visible within the right MCA and 4 radiopaque markers at the distal end of the implant. Note undetached coils within the aneurysm sac to help with stability of the jailed microcatheter. (C, D) Progressive packing of the aneurysm with coils. (E) Final DSA run demonstrating a subtle degree of contrast opacification along the aneurysmal wall.

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