Embolization System Treats Intracranial Aneurysms

A novel intrasaccular flow disruptor helps surgeons achieve embolization of intracranial wide neck bifurcation aneurysms.

The MicroVention (Aliso Viejo, CA, USA) WEB aneurysm embolization system is an endovascular, intrasaccular solution for wide neck bifurcation aneurysms in the middle cerebral artery (MCA) bifurcation, the internal carotid artery (ICA) terminus, the anterior communicating artery complex, the basilar artery apex, and any other saccular bifurcation intracranial aneurysm that has a dome diameter of three to 10 mm and a neck size of four 4 mm (or greater), or a dome-to-neck ratio between one and two.


The system includes an implant constructed of a self-expanding microbraid mesh of nitinol wires with a platinum core, a configuration designed to bridges the aneurysm neck, disrupt blood flow, and create a scaffold for long-lasting treatment. During treatment, the physician selects the appropriate device size and shape based on the size, shape, and location of the intracranial aneurysm to be occluded. Proximal and distal platinum radiopaque markers facilitate device delivery under fluoroscopic visualization.

The WEB implant is provided in a broad range of diameters and lengths in two different shapes, a barrel shape (SL) and a sphere shape (SLS). The implant is attached to a delivery system navigated through compatible microcatheters with an introducer sheath to the target aneurysm, and subsequently electro-thermally detached with a hand-held, battery-powered, single-use detachment controller inside the aneurysm sac. The mesh obstructs blood flow from entering the sac of the aneurysm, creating blood stasis and promoting endothelial growth across the neck of the aneurysm.

“We are proud to offer our latest innovation to the neuroendovascular market in the United States with the introduction of the WEB System, achieving the most rigorous standard of FDA approval,” said Richard Cappetta, President and CEO of MicroVention. “At MicroVention, we work side-by-side with physicians to consistently deliver innovative technologies to advance patient care.”

Wide-neck aneurysms are often untreatable by surgical clipping, as many of them are in vessels deep within the brain that are not amendable to treatment by open brain surgery. Coiling wide neck aneurysms, on the other hand, could lead to coil protrusion and/or embolization, as it is difficult to achieve and maintain sufficiently dense coil packing of the aneurysm to permanently exclude blood flow.

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