Importance

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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. The transducer is mounted within the handpiece at a location that corresponds to a vibration node common to both the first frequency and the second frequency. Also claimed is a method for use, including the steps of: developing an ultrasonic resonance at a first frequency; developing an ultrasonic resonance at a second frequency which is approximately three times greater than the first frequency; resonating an ultrasonic transducer at the first frequency concurrently with the second frequency; and supporting the transducer where the nodes of vibration at the first frequency are substantially coincident with the nodes of vibration at the second frequency.

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First Claim