A system for delivering a vaso-occlusive device for release within vasculature of a patient, the device containing an outer helically wound primary coil having a proximal end and distal ends, defining a lumen between them. The proximal end is detachably mounted to the distal end of an elongated delivery means. Further, the system also comprises an attachment element, at the distal end of the vaso-occlusive device and a stretch resisting member with two proximal ends and a distal end, extending at least partially through the lumen and passing through the attachment element, the distal end being releasably attached to the distal attachment element. The device has the advantage that the device is not damaged during manipulation by a physician, reducing the risk of injury to a patient.
