Patent ID: 6994711

Claim:
A small diameter vasoocclusive coil deployment system for use in placing a coil at a preselected site within a vessel comprising: an elongated flexible catheter having a lumen extending therethrough so as to define an outer wall and having a proximal section and a distal section; an embolic coil assembly comprised of a helically wound flexible coil having proximal and distal ends and a cylindrical headpiece having proximal and distal sections, the distal section of the headpiece is disposed within the proximal end of the coil and the proximal section of the headpiece extends outwardly beyond the proximal end of the coil, said proximal section of the cylindrical headpiece having a diameter approximately equal to the diameter of the lumen of the catheter and said proximal section of said cylindrical headpiece being disposed in fluid-tight engagement within the lumen of the distal section of the catheter; and, a syringe coupled to the proximal section of the catheter for applying a fluid pressure to the interior of the catheter to thereby cause the cylindrical headpiece to be released from the lumen of the catheter to thereby deploy the embolic coil assembly.