this is a device for bridging the neck of either a wide - necked or narrow - necked aneurysm in the vasculature . in general , it is a device used to stabilize the presence of vaso - occlusive devices in the aneurysm . the device preferably is delivered by a core wire which terminates in an electrolytically severable joint . the core wire will often be insulated . the retainer assembly itself is also attached to the electrolytic joint and typically has a number of array elements which are intended to be resident within the aneurysm after the device is deployed from the distal end of a catheter . after deployment of this retainer , the aneurysm is at least partially filled with a vaso - occlusive device such as helically wound coils .