System for measuring a characteristic of flow of liquid in a vessel of a patient comprising a transducer positioned in a vessel in a patient for supplying ultrasonic energy. The transducer produces a substantially uniform beam which encompasses the vessel. The transducer receives ultrasonic energy back...http://www.google.fr/patents/US5105818?utm_source=gb-gplus-shareBrevet US5105818 - Apparatus, system and method for measuring spatial average velocity and/or volumetric flow of blood in a vessel and screw joint for use therewith
Apparatus, system and method for measuring spatial average velocity and/or ...
