A device (30) for serial treatment of hollow bodies including: a transport member (32); a treatment rod (38) mounted slidably relative to the transport member (32); controlled elements for moving each treatment rod (38) between a retracted position and an extended position in which the treatment rod (38) is intended for being inserted axially into the transported hollow body; wherein the controlled elements consist of an electric actuator (42) controlled by an electronic control unit (44) for stopping the treatment rod (38) in the extended position thereof. A method for serial treatment of preforms using the treatment device is also described.
