it is believed that the surgical ultrasound in the frequency range of 20-50 khz exploits the direct effects of mechanical vibrations. based on the assumption that the behaviour of soft tissue is viscoelastic, a model with a linear spring and a dashpot connected in parallel is employed to explain theoretically the mechanisms of tissue fragmentation produced by ultrasonic magnetostrictively driven probes. in addition a prototype motor-driven vibrating probe has been developed in our laboratory to investigate experimentally the mode of action of ultrasonic surgical devices. (author)
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