A delivery wire assembly has a proximal tubular portion, a distal coil portion, and a lumen extending at least partially through the assembly, the delivery wire forming a first conductive path extends through the lumen from a proximal end of the delivery wire assembly to a location distal with respect to the distal coil portion. The distal extension includes a sacrificial detachment zone. The delivery wire assembly further includes a second conductive path formed by the proximal tubular portion and distal coil portion. A delivery wire adapter has a distal end comprising a plurality of fingers configured to interface between adjacent open pitched windings of the proximal end of an attached occlusive coil. The proximal end of the delivery wire adapter is secured to a distal portion of the delivery wire.
