Embolic coil

An embolic coil comprising:

• a coil body constituted by an elongated coil portion that is helically coiled so that the coil body is a helical coil body that has an inner surface surrounding an interior of the helical coil body;
• the elongated coil portion being constituted by an elongated wire that is spirally wound around a coil axis;
• the elongated wire possessing an outer surface having a 360° circumferential extent and extending along a longitudinal extent of the elongated wire;
• and
• at least one groove provided in the outer surface of the elongated wire, the at least one groove extending around at least a portion of the 360° circumferential extent of the outer surface of the elongated wire.

A method comprising:

• moving a catheter towards an indwelling position in an inner cavity of a patient's living body while an embolic coil is positioned inside the catheter, the embolic coil comprising a coil body in which a wire extends spirally, the wire possessing an outer surface, the outer surface of the wire being provided with at least one groove;
• moving the embolic coil from inside the catheter to a position outside the catheter to deliver the embolic coil to the indwelling position in the inner cavity;
• and
• the moving of the embolic coil from inside the catheter to the position outside the catheter causing the coil body to form loops in the inner cavity.