Electrical contact for occlusive device delivery system

An occlusive coil delivery system, comprising:

• a delivery catheter comprising a proximal end, a distal end, and a catheter lumen extending between the proximal and distal ends;
• a delivery wire assembly comprising
• a delivery wire conduit having a proximal tubular portion coupled to a distal coil portion, the respective tubular and coil portions defining a conduit lumen, the proximal tubular portion tapers down in cross section in a proximal direction from a distal larger diameter region to a proximal smaller diameter region, wherein the tapering occurs at a proximal terminal end of the proximal tubular portion of the delivery wire conduit,
• a core wire disposed in the conduit lumen and having a distal end detachably coupled to an occlusive coil, and
• an electrical contact coupled to a proximal end of the core wire and disposed around the proximal terminal end of the proximal tubular portion of the delivery wire conduit, the electrical contact and core wire forming an anode of an electrolytic detachment circuit for detaching the occlusive coil from the core wire, wherein an outer diameter of the electrical contact is substantially the same as an outer diameter of the distal larger diameter region of the proximal terminal end of the proximal tubular portion;
• and
• a power supply electrically connected to the core wire.