An ultrasound treatment device , for the treatment of veins, in particular a HIFU treatment device, the device comprising: - a probe head comprising an ultrasound transducer for delivering treatment ultrasound waves focused onto a target (T) within an object (O) and an imaging device for imaging of the object (O), - a compression device for applying a compression force to the object (O), wherein the compression device is formed by one of a balloon and a moving mechanism of the probe head , and - a controller unit connected at least to the probe head and the compression unit, wherein the device is adapted to switch between at least two operating modes (I, II), wherein - in a first operating mode (I) the compression force applied to the object (O) by the compression unit is maintained at a first compression force value (CF1), and - in a second operating mode (II) the compression force applied to the object (O) by the compression unit is maintained at a second compression force value (CF2), higher than the first compression force value (CF1), characterized in that in the first operating mode (I) the controller unit controls the imaging device to perform imaging of the object (O), and in the second operating mode (II) the controller unit controls the ultrasound transducer to emit at least one pulse of treatment ultrasound waves wherein the second operating mode is adapted for partial, preferably total, collapsing of a vein and/or to stop blood flow for the treatment of the vein. treatment device, the device comprising: - a probe head comprising an ultrasound transducer for delivering treatment ultrasound waves focused onto a target (T) within an object (O) and an imaging device for imaging of the object (O), - a compression device for applying a compression force to the object (O), wherein the compression device is formed by one of a balloon and a moving mechanism of the probe head , and - a controller unit connected at least to the probe head and the compression unit, wherein - a probe head comprising an ultrasound transducer for delivering treatment ultrasound waves focused onto a target (T) within an object (O) and an imaging device for imaging of the object (O), - a compression device for applying a compression force to the object (O), wherein the compression device is formed by one of a balloon and a moving mechanism of the probe head , and - a controller unit connected at least to the probe head and the compression unit, wherein the device is adapted to switch between at least two operating modes (I, II), wherein - in a first operating mode (I) the compression force applied to the object (O) by the compression unit is maintained at a first compression force value (CF1), and - in a first operating mode (I) the compression force applied to the object (O) by the compression unit is maintained at a first compression force value (CF1), and - in a second operating mode (II) the compression force applied to the object (O) by the compression unit is maintained at a second compression force value (CF2), higher than the first compression force value (CF1), characterized in that in the first operating mode (I) the controller unit controls the imaging device to perform imaging of the object (O), and in the second operating mode (II) the controller unit controls the ultrasound transducer to emit at least one pulse of treatment ultrasound waves <EOS>