The Application of Ultrasonic Vibration Drills in Traumatology

The dynamics of ultrasonic vibration drills having the common source of rotational and reciprocal movement of the driven element has been examined. The method, the mathematical model and the specific software for the calculation of the dynamic characteristics of the drills have been developed, with regard to the power limitation of the source, namely the rod ultrasonic vibrating system. The load point dependences of the useful power and the number of revolutions of the driven element have been found for the two schemes of excitation of the piezoelectroacoustic transformer of ultrasonic vibrating system: in particular, from the voltage and current generators. The occurrence of the two extremes on the power curve has been demonstrated to be the criterion characterizing the upper limit of the useful power taken from the transformer for rotating the specific ultrasonic vibrating system. In this case, the additional power takeoff for ultrasonic tissue processing will be accompanied by the significant power reduction necessary for the rotational movement. The possibility of the synthesis of vibration drills both with soft and hard load characteristics due to the change in such parameters as the setting angle of pushers, the average radius of their adjustment, the length and the width of the pusher, as well as the changes in the scheme of excitation of the electro-acoustic transformer (voltage and current generators, respectively), has been shown.