Provided herein are systems, devices and methods for the correction of spinal deformities with the use one or more implantable rods configured to apply a corrective force to the spine. The actuator can include a button and a spring coupled to the marker. The modulation at frequency fmod shifts the signal to side bands about the modulation frequency. The compressed high-humidity air and the regenerating air are guided to dehumidifying-and-regenerating components of the dehumidifying-and-regenerating unit by a shunt rotor of the air distribution unit to complete the dehumidification of the compressed air and the regeneration of the dehumidifying-and-regenerating components. The wires are guided towards one another, by way of the torch tubes, wherein at the outlet and in the region of the electric arc, the electric arc of the electrodes wires, which is arranged in the contact region of the wires, is arranged in the region of the flow of the discharged process has, referred as the main gas arranged transversely to the main transporting direction of the wires. Each of selected ones of the elongated elements comprise a first conductive element.