A delivery device (10, 110, 210) for a collapsible prosthetic heart valve, the delivery device comprising: an operating handle (20, 120, 220), including: a housing (30, 130, 230) defining a movement space therein; a carriage assembly (40, 240) moveable in a longitudinal direction within the movement space and including a body (41, 141, 241) and a toothed rack (36, 136, 236) extending from the body; a deployment actuator (21, 121, 221) coupled to the housing (30, 130, 230) and rotatable relative to the housing, the deployment actuator including a knob rotatable about a central axis that extends transverse to the longitudinal direction; and a coupling assembly (60, 260) configured to rotate with the deployment actuator (21, 121, 221), the coupling assembly having an engaged position with the toothed rack (36, 136, 236) in which rotation of the deployment actuator moves the carriage assembly (40, 240) in the longitudinal direction, and a disengaged position from the toothed rack in which rotation of the deployment actuator does not move the carriage assembly in the longitudinal direction; and a catheter assembly (16, 116, 216), including: a first shaft around which a compartment (23, 123, 223) is defined, the first shaft being operatively connected to the housing (30, 130, 230), the compartment being adapted to receive the valve in an assembled condition; and a distal sheath (24, 124, 224) operatively connected to the carriage assembly (40, 240), the distal sheath being moveable between a closed condition covering the compartment (23, 123, 223) and an open condition uncovering the compartment for deployment of the valve, wherein movement of the carriage assembly (40, 240) in the longitudinal direction in the movement space moves the distal sheath between the closed condition and the open condition. an operating handle (20, 120, 220), including: a housing (30, 130, 230) defining a movement space therein; a carriage assembly (40, 240) moveable in a longitudinal direction within the movement space and including a body (41, 141, 241) and a toothed rack (36, 136, 236) extending from the body; a deployment actuator (21, 121, 221) coupled to the housing (30, 130, 230) and rotatable relative to the housing, the deployment actuator including a knob rotatable about a central axis that extends transverse to the longitudinal direction; and a coupling assembly (60, 260) configured to rotate with the deployment actuator (21, 121, 221), the coupling assembly having an engaged position with the toothed rack (36, 136, 236) in which rotation of the deployment actuator moves the carriage assembly (40, 240) in the longitudinal direction, and a disengaged position from the toothed rack in which rotation of the deployment actuator does not move the carriage assembly in the longitudinal direction; and a housing (30, 130, 230) defining a movement space therein; a carriage assembly (40, 240) moveable in a longitudinal direction within the movement space and including a body (41, 141, 241) and a toothed rack (36, 136, 236) extending from the body; a deployment actuator (21, 121, 221) coupled to the housing (30, 130, 230) and rotatable relative to the housing, the deployment actuator including a knob rotatable about a central axis that extends transverse to the longitudinal direction; and a coupling assembly (60, 260) configured to rotate with the deployment actuator (21, 121, 221), the coupling assembly having an engaged position with the toothed rack (36, 136, 236) in which rotation of the deployment actuator moves the carriage assembly (40, 240) in the longitudinal direction, and a disengaged position from the toothed rack in which rotation of the deployment actuator does not move the carriage assembly in the longitudinal direction; and a catheter assembly (16, 116, 216), including: a first shaft around which a compartment (23, 123, 223) is defined, the first shaft being operatively connected to the housing (30, 130, 230), the compartment being adapted to receive the valve in an assembled condition; and a distal sheath (24, 124, 224) operatively connected to the carriage assembly (40, 240), the distal sheath being moveable between a closed condition covering the compartment (23, 123, 223) and an open condition uncovering the compartment for deployment of the valve, a first shaft around which a compartment (23, 123, 223) is defined, the first shaft being operatively connected to the housing (30, 130, 230), the compartment being adapted to receive the valve in an assembled condition; and a distal sheath (24, 124, 224) operatively connected to the carriage assembly (40, 240), the distal sheath being moveable between a closed condition covering the compartment (23, 123, 223) and an open condition uncovering the compartment for deployment of the valve, wherein movement of the carriage assembly (40, 240) in the longitudinal direction in the movement space moves the distal sheath between the closed condition and the open condition.