Ultrasound catheter system having modulated output with...

A - Human Necessities – 61 – N

Patent

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A61N 7/00 (2006.01) A61B 17/22 (2006.01) A61B 17/00 (2006.01) A61B 18/12 (2006.01) A61M 3/02 (2006.01)

Patent

CA 2173446

A method and apparatus for driving an ultrasound transducer (14) coupled to an ultrasound disposed within an elongate catheter (10) has a modulated output and utilizes feedback control. A modulating signal varying in amplitude and continuous in duration modulates an ultrasound transducer drive signal. The resulting modulated ultrasound drive signal is likewise continuous in duration such that it lacks the abrupt accelerations which cause stress to be applied to the ultrasound transmission member in prior art devices. The current of the modulated drive signal is monitored and the voltage thereof is varied in response to changes in the current in order to provide feedback control. A transmission member breakage alarm provides an indication of transmission member breakage in the event that any comparison of the drive energy to the feedback control signal indicates that the desired ultrasonic vibration has been reached at a drive energy level less than the minimum drive energy level typically desired for such desired ultrasound vibration when the ultrasound transmission member is intact.

Procédé et dispositif servant à commander un transducteur à ultrasons (14) couplé à une transmission à ultrasons située à l'intérieur d'un cathéter allongé (10), permettant d'obtenir un signal de sortie modulé et utilisant une régulation par réaction. Un signal de modulation à amplitude variable et à durée continue module un signal de commande du transducteur à ultrasons. Le signal de commande modulé est également d'une durée continue, de telle manière qu'il est exempt des accélérations abruptes provoquant l'application de contraintes à l'élément de transmission ultrasonore dans les dispositifs correspondant à l'état actuel de la technique. Le courant du signal de commande modulé est surveillé et sa tension est modifiée en réaction à des modifications du courant, afin de produire une régulation par réaction. Une alarme indique la rupture dudit élément au cas où toute comparaison de l'énergie de commande avec le signal de régulation par réaction indique que la vibration ultrasonore souhaitée est atteinte à un niveau d'énergie de commande inférieur au niveau d'énergie de commande minimum normalement souhaité pour ladite vibration ultrasonore, quand l'élément de transmission ultrasonore est intact.

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