Abstract: A single ultrasonic surgical apparatus can provide a substantial cutting effect on tissue, a substantial coagulation effect on tissue, and an appropriate blend of simultaneous cutting and coagulation effects on tissue. The ultrasonic surgical apparatus is comprised of a handpiece which incorporates a transducer and a surgical tool, a source of electrical energy, a controller, and a switch. The apparatus may be operated at two frequencies within the ultrasonic spectrum, where the first frequency is selected at the low end of the spectrum for enhanced tissue cutting performance, and the second frequency is approximately three times higher for enhanced tissue coagulation performance. The two frequencies may be operated selectively or concurrently, and may be independently adjustable as to amplitude. The transducer may be composed of magnetostrictive or piezoelectric elements. The surgeon to set the desired amplitude of the mechanical vibrations.