A device system and method for the non-invasive ultrasound measurement of the intravascular blood pressure is presented, wherein the blood pressure measurements are performed by means of the registration of the distances changes between the surface of the active piezoelectric transducer radiating an ultrasound beam into the localization area of the blood vessel or the heart chamber and the surface elements of the passive ultrasound beam reflector implanted into the blood vessel or the heart chamber. The invention is applicable to any medium transparent for ultrasound waves with the need to measure pressure changes of the liquid.
