An embolic coil configured with a self-adaptive floating diameter in a relaxed condition substantially assuming the shape of the inner surface of the vessel at the site of an embolization procedure. The embolic coil comprises a distal end having an anchoring loop for anchoring at the site, a proximal end with a loop for detaching from a gripper assembly adapted to deliver to the site, a primary framing coil formed of a plurality of primary omega curves extending between the proximate and distal ends, and a secondary filling coil arrangement formed from a plurality of secondary omega curves that follow the trajectory of the plurality of primary omega curves along the longitudinal length of the embolic coil between the proximate and distal ends. The embolic coil conforms to the diameter of the aneurysm sac enabling retractability and rapid disconnect detachment for such embolic coil advantageously requiring fewer embolic coils.