A delivery and detachment system for an implantable intravascular device, the system comprising: an inner support tube having a passageway extending in an axial direction from a proximal end to an opposite distal end; and a securement wire extending through the passageway of the inner support tube; an outer sleeve surrounding an outer surface of the inner support tube, wherein the outer sleeve is made of a reflowable material; characterized in that the inner support tube has defined therein at least one side port opening (165a, 165b, 165c) intersecting with the passageway and the outer surface of the inner support tube; and the reflowable material of the outer sleeve being seepable through the at least one side port opening defined in the inner support tube and into the passageway of the inner support tube forming an associated point of direct physical contact with the securement wire; and wherein each associated point of direct physical contact is configured to impose on the securement wire a controlled friction force established within an intentional friction zone located anywhere between the distal end of the inner support tube and a midway point between the respective proximal and distal ends of the inner support tube. an inner support tube having a passageway extending in an axial direction from a proximal end to an opposite distal end; and a securement wire extending through the passageway of the inner support tube; an outer sleeve surrounding an outer surface of the inner support tube, wherein the outer sleeve is made of a reflowable material; characterized in that the inner support tube has defined therein at least one side port opening (165a, 165b, 165c) intersecting with the passageway and the outer surface of the inner support tube; and the reflowable material of the outer sleeve being seepable through the at least one side port opening defined in the inner support tube and into the passageway of the inner support tube forming an associated point of direct physical contact with the securement wire; and wherein each associated point of direct physical contact is configured to impose on the securement wire a controlled friction force established within an intentional friction zone located anywhere between the distal end of the inner support tube and a midway point between the respective proximal and distal ends of the inner support tube. characterized in that the inner support tube has defined therein at least one side port opening (165a, 165b, 165c) intersecting with the passageway and the outer surface of the inner support tube; and the reflowable material of the outer sleeve being seepable through the at least one side port opening defined in the inner support tube and into the passageway of the inner support tube forming an associated point of direct physical contact with the securement wire; and wherein each associated point of direct physical contact is configured to impose on the securement wire a controlled friction force established within an intentional friction zone located anywhere between the distal end of the inner support tube and a midway point between the respective proximal and distal ends of the inner support tube.