A delivery device for a collapsible prosthetic heart valve may include a catheter assembly and an operating handle. The catheter assembly may include an inner shaft around which a compartment is defined, and a distal sheath having proximal and distal segments configured to enclose the compartment. The operating handle may include a first lead screw fixedly coupled to the proximal segment, a second lead screw coupled to the distal segment, a knob rotatable relative to a housing of the operating handle and threadedly engaged with the first lead screw, and a coupling assembly. The coupling assembly may have a first condition in which rotation of the knob in one direction moves the first lead screw but not the second lead screw, and a second condition in which rotation of the knob in the one direction simultaneously moves the first lead screw and the second lead screw.
