Ultrasonic handpiece

摘要

An ultrasonic handpiece is used for augmenting a screw. The handpieces comprise a housing, an ultrasonic converter shiftingly accommodated in the housing, and a sonotrode connected to one end of the ultrasonic converter. The sonotrode protrudes from the housing into the screw. An adjusting element is adjustably connected to the housing. A spring is provided the ends of which are supported by the ultrasonic converter and the housing, respectively. The ultrasonic converter is preloaded in the direction away from the adjuster wheel by setting the adjusting element, thereby the sonotrode is urged with a selected force into the screw and the augmentation material is pressed out of the screw and into the bone.