An acoustic measurement device for the blood flow in a portion of the cardiovascular system of an individual, in particular for operations of decompression bubble detection, the device comprising: an acoustic emitter comprising at least one acoustic transducer suited for emitting an ultrasound beam and detecting a reflected ultrasonic signal, and a case in which the acoustic emitter is received, characterized in that the case comprises an emission surface, substantially flat or convex, coming to cap the acoustic emitter to protect it from an outside environment and to assure the transmission of the ultrasound beam and the reflected ultrasound signal, the emission surface extending substantially in a plane of vertical extension (Y, Z) comprising a transverse direction and a perpendicular vertical direction so as to be able to come into contact with the skin of an individual along a longitudinal direction substantially perpendicular to the plane vertical extension (Y, Z), the emission surface being terminated at one end along the vertical direction by a clavicular contact portion substantially perpendicular to the emission surface and suited for coming to rest against a clavicle bone of the individual, the emission surface being terminated at one end along the transverse direction by a shoulder contact portion substantially perpendicular to the emission surface and suited for coming to rest against a bone of the shoulder of the individual, a vertical distance between the middle of the active zone of the emission surface and the clavicular contact portion being less than 20 mm, and a transverse distance between the middle of the active zone of the emission surface and the shoulder contact portion being included between 20 and 50 mm. an acoustic emitter comprising at least one acoustic transducer suited for emitting an ultrasound beam and detecting a reflected ultrasonic signal, and a case in which the acoustic emitter is received, characterized in that the case comprises an emission surface, substantially flat or convex, coming to cap the acoustic emitter to protect it from an outside environment and to assure the transmission of the ultrasound beam and the reflected ultrasound signal, the emission surface extending substantially in a plane of vertical extension (Y, Z) comprising a transverse direction and a perpendicular vertical direction so as to be able to come into contact with the skin of an individual along a longitudinal direction substantially perpendicular to the plane vertical extension (Y, Z), the emission surface being terminated at one end along the vertical direction by a clavicular contact portion substantially perpendicular to the emission surface and suited for coming to rest against a clavicle bone of the individual, the emission surface being terminated at one end along the transverse direction by a shoulder contact portion substantially perpendicular to the emission surface and suited for coming to rest against a bone of the shoulder of the individual, a vertical distance between the middle of the active zone of the emission surface and the clavicular contact portion being less than 20 mm, and a transverse distance between the middle of the active zone of the emission surface and the shoulder contact portion being included between 20 and 50 mm.