Following animations and videos explain the Brain aneurysm treatment using WEB device quite well::

https://www.yalemedicine.org/stories/web-device-treat-brain-aneurysms/ 

https://www.kch.nhs.uk/Doc/pl%20-%20618.2%20-%20web%20intracranial%20aneurysm%20device%20for%20treating%20cerebral%20aneurysms.pdf

The basic procedure and way to access the aneurysm using minimally invasive means remains the same. - https://www.snisonline.org/cerebralangiography/