Embolic coil delivery system with mechanical release mechanism

A vasooclusive embolic device deployment system for use in placing an embolic device at a predetermined site within a vessel comprising:

• an elongated flexible deployment catheter having a lumen extending therethrough and having proximal and distal ends;
• an embolic device comprised of a helical coil having a proximal turn which is closed upon itself to form a retaining ring;
• an elongated pusher member having a lumen extending therethrough and having proximal and distal ends and being slidably disposed within the lumen of the deployment catheter, said pusher member having an integral tab portion extending from the distal end thereof and having an aperture extending through said tab portion, said tab portion extending through said retaining ring to thereby engage said embolic device;
• and,
• an elongated detachment member extending from a position proximal of the proximal end of the pusher member, through the lumen of the pusher member and through the retaining ring of said embolic device and through the aperture of the tab portion of said pusher member such that when the detachment member is pulled proximally the distal end of the detachment member is withdrawn from the retaining ring and the aperture of the tab portion to thereby release the embolic device.