In the 1990s, the use of a neurovascular stent for a procedure call “stent-assisted coiling” was considered a breakthrough treatment for treating brain aneurysms. The medical device offered a non-surgical method to address weak spots in blood vessels in the brain. An aneurysm occurs when a weak point in a vessel allows blood to bulge out the vessel wall. If the aneurysm bursts, it can cause traumatic consequences, particularly when the aneurysm is located in the brain.
A non-stent assisted coiling treatment for an aneurysm involved running a stint from a patient’s leg up into the location of the aneurysm in the brain. The catheter would then inject a string of soft platinum into the aneurysm, which coils upon itself within the “bubble” of the aneurysm. After the platinum was fully deployed, the blood in the aneurysm clots along the coil and eventually fills the either aneurysm, such that is no longer poses the threat of rupture.
The procedure described above worked well, unless the aneurism had a “wide neck.” Where a normal aneurysm looks like a bubble stuck on the side of the vessel, a wide neck aneurysm looks more like a semi-circle. Instead of having a small weak spot in the vessel bulge out into a bubble, the wide neck variety involves a larger weak spot that expands the vessel in a distorted manner. Introducing the platinum coil into the aneurysm is not feasible, as the coil is too exposed to the blood flow and will not remain in place.