A delivery device for a collapsible prosthetic heart valve, the delivery device comprising: a catheter assembly including an inner shaft around which a compartment is defined, and a distal sheath having a proximal segment and a distal segment together configured to enclose the compartment; and an operating handle coupled to the catheter assembly, the operating handle including: a housing (20, 21, 22) defining a movement space therein, the movement space extending in an elongation direction; a first elongated element fixedly coupled to the proximal segment of the distal sheath and moveable in first and second opposite longitudinal directions within the movement space; a second elongated element coupled to the distal segment of the distal sheath and moveable in the first and second longitudinal directions within the movement space, at least a portion of the first and second elongated elements (30, 32) overlapping in the elongation direction, each of the first and second elongated elements being independently longitudinally slidable relative to the other of the first and second elongated elements; a first actuator coupled to the housing (20, 21) and moveable relative to the housing, the first actuator being operatively engaged with the first elongated element; and a second actuator coupled to the housing (21, 22) and moveable relative to the housing and relative to the first actuator, the second actuator being operatively engaged with the second elongated element, wherein the first elongated element is a first lead screw and the second elongated element is a second lead screw, the first actuator is a first knob and the second actuator is a second knob, and the first and second knobs are threadedly engaged with the first and second lead screws (30, 32), respectively, and wherein one of the first and second lead screws has a rib (32a, 32b) extending in the first and second longitudinal directions and the other of the first and second lead screws has a slot (30a, 30b) extending in the first and second longitudinal directions, the rib being engaged in the slot. a catheter assembly including an inner shaft around which a compartment is defined, and a distal sheath having a proximal segment and a distal segment together configured to enclose the compartment; and an operating handle coupled to the catheter assembly, the operating handle including: a housing (20, 21, 22) defining a movement space therein, the movement space extending in an elongation direction; a first elongated element fixedly coupled to the proximal segment of the distal sheath and moveable in first and second opposite longitudinal directions within the movement space; a second elongated element coupled to the distal segment of the distal sheath and moveable in the first and second longitudinal directions within the movement space, at least a portion of the first and second elongated elements (30, 32) overlapping in the elongation direction, each of the first and second elongated elements being independently longitudinally slidable relative to the other of the first and second elongated elements; a first actuator coupled to the housing (20, 21) and moveable relative to the housing, the first actuator being operatively engaged with the first elongated element; and a second actuator coupled to the housing (21, 22) and moveable relative to the housing and relative to the first actuator, the second actuator being operatively engaged with the second elongated element, a housing (20, 21, 22) defining a movement space therein, the movement space extending in an elongation direction; a first elongated element fixedly coupled to the proximal segment of the distal sheath and moveable in first and second opposite longitudinal directions within the movement space; a second elongated element coupled to the distal segment of the distal sheath and moveable in the first and second longitudinal directions within the movement space, at least a portion of the first and second elongated elements (30, 32) overlapping in the elongation direction, each of the first and second elongated elements being independently longitudinally slidable relative to the other of the first and second elongated elements; a first actuator coupled to the housing (20, 21) and moveable relative to the housing, the first actuator being operatively engaged with the first elongated element; and a second actuator coupled to the housing (21, 22) and moveable relative to the housing and relative to the first actuator, the second actuator being operatively engaged with the second elongated element, wherein the first elongated element is a first lead screw and the second elongated element is a second lead screw, the first actuator is a first knob and the second actuator is a second knob, and the first and second knobs are threadedly engaged with the first and second lead screws (30, 32), respectively, and wherein one of the first and second lead screws has a rib (32a, 32b) extending in the first and second longitudinal directions and the other of the first and second lead screws has a slot (30a, 30b) extending in the first and second longitudinal directions, the rib being engaged in the slot.