Ultrasound application device

Applicator for use in a high power ultrasound application device, which is couplable with a power source and comprises:

• a converter element for converting electric signals into ultrasound waves;
• a treatment head configured to apply ultrasound waves from the converter element to a subject to be treated;
• a handle for holding and manipulating the applicator;
• and
• an oscillator circuit arranged in the applicator and comprising one or more electronic components configured to be energized by a power source and to generate an output signal to drive the converter element;
• wherein spaces between an inner layer of the handle and one or more electronic components that are filled with one or more thermal conductors, such that the oscillator circuit is in thermal contact with the handle and a heat conductive channel is provided between at least a portion of the circuit and an outer layer of the handle configured to direct heat from at least a portion of the circuit towards an operator holding the outer layer of the handle during operation.