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Devices designed to provide electrical energy at one or more frequencies in the range between 10 kHz and 3 GHz (i.e., radiofrequency [RF]); RF generators used in clinical applications usually provide output energy at several levels and waveforms in a frequency range of 10 kHz to less than 100 MHz. These devices typically consist of electronic circuits that convert the input energy either from the power line (typically at 50 or 60 Hz) or, less frequently, from a battery into an RF signal; the generators are typically an integral part of specialized equipment. Dedicated RF generators are used in equipment that either directly delivers RF energy to the body (e.g., electrosurgical units, RF therapy systems) or converts RF energy into another form of energy (using an appropriate transducer), such as ultrasound (e.g., ultrasonic scanning systems, ultrasonic lithotripters) and heat (e.g., electrothermal cautery units, thermal angioplasty). Some generators with a set of appropriate connectors and/or couplers can be used for several of these tasks. RF generators are also available as independent units for device testing, communication services, and other ancillary tasks.
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