Coiling refers to the process of filling the aneurysm with coils, which are typically made of platinum, nickel-titanium alloy, or stainless steel. This approach is minimally invasive, as the coils are introduced through a small incision in the patient's groin and guided through the blood vessels to the location of the aneurysm. Once in position, the coils are released, and they expand to fill the aneurysm, effectively occluding the blood flow and preventing further growth or rupture.

Despite these benefits, coiling does have some limitations. For example, it may not be effective for larger aneurysms, as the coils may not be able to completely block the blood flow. Coiling may also be less effective in cases where the aneurysm has a complex shape or is located in a difficult-to-reach area of the brain.

To address these limitations, adjunctive devices have been developed to complement the coiling procedure. One such device is the stent-assisted coiling technique, in which a small metal mesh tube is placed within the blood vessel to provide support for the coils and improve their effectiveness. This approach has been shown to be particularly effective for complex aneurysms, as it allows for greater control over the position and shape of the coils.