Method and apparatus for locating vibrating devices

A - Human Necessities – 61 – B

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A61B 8/00 (2006.01) A61B 5/06 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2185335

An ultrasonic imaging system (10) which includes a display (12) for guiding a user in the placement of a needle (20) within the body includes a vibrating element (22) which transmits vibratory mechanical oscillation at a predetermined frequency of vibration to the interventional medical device. The medical device completes am oscillation during each vibratory period. An imaging transducer (16) sequentially transmits ultrasonic waves down a selected image line into the imaging region in pulses which are separated by a time interval determined as a function of the vibratory period so that they coincide with maximum displacement of a given point on the interventional device. Return signals received after each pulse are processed to eliminate static and non-static tissue components so that a bright image of the vibrating element is obtained.

Un système d'imagerie ultrasonore (10) comportant un affichage (12) pour guider un utilisateur dans le positionnement d'une aiguille (20) au sein d'un corps comprend un élément vibrant (22) qui transmet au dispositif médical d'intervention des oscillations mécaniques vibratoires à une fréquence prédéterminée de vibrations. Ce dispositif médical effectue une oscillation pendant chaque période vibratoire. Un transducteur d'imagerie (16) transmet séquentiellement des ondes ultrasonores qui descendent le long d'une ligne d'images sélectionnées pour aboutir dans la région d'imagerie, sous forme d'impulsions qui sont séparées par un intervalle de temps déterminé en fonction de la période vibratoire de sorte qu'elles coïncident avec le déplacement maximal d'un point donné sur le dispositif d'intervention. Les signaux de retour reçus après chaque impulsion sont traités pour éliminer les composantes correspondant aux tissus statiques et non statiques de manière à obtenir une image claire de l'élément vibrant.

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