Abstract: The invention relates to a device for therapeutical treatment of a blood vessel. It comprises in combination a stent, a balloon catheter for the insertion of the stent into a blood vessel, and a generator for generating ultrasound. The stent can be expanded radially and is of such construction that it is caused to vibrate and/or develop heat when exposed to ultrasound. Inserted into the blood vessel the stent can be expanded by means of the balloon catheter to engage the inside surface of the blood vessel in order to be left in the expanded condition as an inside lining in the blood vessel after the balloon catheter having been withdrawn from the blood vessel. Energy is transferred wirelessly by means of ultrasound generated by the generator, from an extra-corporeal position to the stent as located in the blood vessel engaging the inside surface thereof.