A steering assembly for steering a steerable medical device, comprising: a handle portion secured to a steerable medical device, the steerable medical device comprising a first tubular member a second tubular member, the handle portion comprising a first screw with a helical thread and a second screw with a helical thread, the first screw operably coupled to the first tubular member and the second screw operatively coupled to the second tubular member, and an actuator with an outer surface adapted to be actuated by a user, the actuator in operable communication with the first and second screws (5214, 5215), wherein actuation of the actuator cause axial movement of the first screw and first tubular member in a first direction, and causes axial movement of the second screw and second tubular member in a second direction opposite the first direction, whereby the axial movements put one of the first and second tubular members (5110, 5120) in tension and the other of the first and second tubular members (5110, 5120) in compression, and steers a steerable portion of the medical device, characterized in that actuation of the actuator cause proximal movement of the first screw and the first tubular member, and distal movement of the second screw and second tubular member wherein the second screw is within the first screw, and the first tubular member is disposed within the second tubular member. a handle portion secured to a steerable medical device, the steerable medical device comprising a first tubular member a second tubular member, the handle portion comprising a first screw with a helical thread and a second screw with a helical thread, the first screw operably coupled to the first tubular member and the second screw operatively coupled to the second tubular member, and an actuator with an outer surface adapted to be actuated by a user, the actuator in operable communication with the first and second screws (5214, 5215), wherein actuation of the actuator cause axial movement of the first screw and first tubular member in a first direction, and causes axial movement of the second screw and second tubular member in a second direction opposite the first direction, whereby the axial movements put one of the first and second tubular members (5110, 5120) in tension and the other of the first and second tubular members (5110, 5120) in compression, and steers a steerable portion of the medical device, characterized in that actuation of the actuator cause proximal movement of the first screw and the first tubular member, and distal movement of the second screw and second tubular member wherein a first screw with a helical thread and a second screw with a helical thread, the first screw operably coupled to the first tubular member and the second screw operatively coupled to the second tubular member, and an actuator with an outer surface adapted to be actuated by a user, the actuator in operable communication with the first and second screws (5214, 5215), wherein actuation of the actuator cause axial movement of the first screw and first tubular member in a first direction, and causes axial movement of the second screw and second tubular member in a second direction opposite the first direction, whereby the axial movements put one of the first and second tubular members (5110, 5120) in tension and the other of the first and second tubular members (5110, 5120) in compression, and steers a steerable portion of the medical device, characterized in that actuation of the actuator cause proximal movement of the first screw and the first tubular member, and distal movement of the second screw and second tubular member wherein the second screw is within the first screw, and the first tubular member is disposed within the second tubular member.