An occlusive coil delivery device includes an occlusive coil having a plurality of windings with the proximal end having a plurality of open pitched windings, and a delivery wire assembly having a proximal tubular portion and a distal coil portion with a lumen extending at least partially through the assembly, the assembly including a 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 including a sacrificial detachment zone. The delivery wire assembly further includes a second conductive path formed by the proximal tubular portion and distal coil portion, with the delivery device further including a delivery wire adapter having a proximal end and a distal end, the distal end of the adapter comprising a plurality of fingers configured to interface between adjacent open pitched windings of the proximal end of the occlusive coil, with the proximal end of the delivery wire adapter secured to a distal portion of the delivery wire.
