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  • Devices designed for the performance of surgery using ultrasonic energy; the heating effect that causes tissue cutting and coagulation is provided by friction when tissue comes into contact with a vibrating blade. These units typically include a high-frequency generator (frequencies of 23.5 and 55.5 kHz are typical), a handpiece in which electrical energy is transformed into mechanical ultrasonic vibration, and blades (e.g., shears) to apply the ultrasonic energy to the target tissue. Ultrasonic surgical units are used mostly in laparoscopic surgery procedures (e.g., splenectomy) to coagulate and cut tissue, providing proper hemostasis in vessels up to 3 mm in diameter without significant desiccation or charring. Dedicated units intended for dental treatments are also available.
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