Abstract: Arrangements are provided for destroying tumor cells. According to one aspect, an arrangement includes a device having at least one high-frequency ultrasound generator for generating a thermally active, high-frequency oscillation, a plurality of first low-frequency ultrasound generators for generating a therapeutically active low-frequency oscillation, wherein the first low-frequency ultrasound generators each generate a different frequency, and a control system connected to the high-frequency ultrasound generator and to the first low-frequency ultrasound generators in such a way that the tumor cells are subjected to a high-frequency oscillation acting thermally on the tumor cells and to a low-frequency oscillation.

Abstract: The invention relates to an apparatus for destroying tumor cells or pathogens in the blood stream, comprising at least one ultrasonic frequency generator (11) and a device for forming an extracorporeal blood circulation (1) which encompasses at least one heat exchanger (3), at least one blood circulation pump (2, 2?), and a treatment vessel (6) for holding blood. The treatment vessel (6) is mounted downstream of the heat exchanger (3), forms a treatment chamber (13), and is connected to at least one ultrasonic transducer head (8) which is coupled to the ultrasonic frequency generator (11) such that a low-frequency ultrasonic vibration can be introduced into the treatment chamber (13).