A vasculature occlusion device detachment system comprising: a heating element of a predetermined resistivity; the heating element (30, 30') having a proximal end and an opposite distal end; a coil securing suture having a distal end and an opposite proximal end; the proximal end of the coil securing suture terminating in a proximal bead retained within the heating element while the distal end of the coil securing suture extends beyond the distal end of the heating element; the coil securing suture being rotatable, independently of the heating element, 360 degrees about a longitudinal axis extending through the heating element, the coil securing suture being further configured to melt and sever when the heating element is heated; an electrically conductive corewire having a proximal end and an opposite distal end; the distal end of the electrically conductive corewire being connected to the proximal end of the heating element; and an insulated electrically conductive wire separate from the electrically conductive corewire; the insulated electrically conductive wire having a proximal end and an opposite distal end; the distal end of the insulated electrically conductive wire being secured to the heating element at a heating-element-to-conductive wire connection, and wherein the heating element is a helically wound coil comprising a plurality of windings forming a central lumen extending longitudinally therethrough from a proximal end to a distal end of the helically wound coil; characterised in that an inner diameter of the helically wound coil at its proximal end is greater than an inner diameter of the helically wound heating element at its distal end; the proximal bead having an outer diameter smaller than the inner diameter of the helically wound coil at its proximal end; and the proximal bead of the coil securing suture being freely movable in an axial direction within the central lumen of the helically wound coil but retained at the distal end of the helically wound coil by its smaller inner diameter relative to the outer diameter of the proximal bead. a heating element of a predetermined resistivity; the heating element (30, 30') having a proximal end and an opposite distal end; a coil securing suture having a distal end and an opposite proximal end; the proximal end of the coil securing suture terminating in a proximal bead retained within the heating element while the distal end of the coil securing suture extends beyond the distal end of the heating element; the coil securing suture being rotatable, independently of the heating element, 360 degrees about a longitudinal axis extending through the heating element, the coil securing suture being further configured to melt and sever when the heating element is heated; an electrically conductive corewire having a proximal end and an opposite distal end; the distal end of the electrically conductive corewire being connected to the proximal end of the heating element; and an insulated electrically conductive wire separate from the electrically conductive corewire; the insulated electrically conductive wire having a proximal end and an opposite distal end; the distal end of the insulated electrically conductive wire being secured to the heating element at a heating-element-to-conductive wire connection, and wherein the heating element is a helically wound coil comprising a plurality of windings forming a central lumen extending longitudinally therethrough from a proximal end to a distal end of the helically wound coil; characterised in that an inner diameter of the helically wound coil at its proximal end is greater than an inner diameter of the helically wound heating element at its distal end; the proximal bead having an outer diameter smaller than the inner diameter of the helically wound coil at its proximal end; and the proximal bead of the coil securing suture being freely movable in an axial direction within the central lumen of the helically wound coil but retained at the distal end of the helically wound coil by its smaller inner diameter relative to the outer diameter of the proximal bead.