Method for detecting presence of a blade in an ultrasonic...

A - Human Necessities – 61 – B

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A61B 17/32 (2006.01) G01N 29/22 (2006.01) A61B 17/00 (2006.01)

Patent

CA 2359140

The type of blade installed in a hand piece of an ultrasonic system is determined and the information used to adjust the fault detection threshold of the generator by using an impedance diagram to determine the type of blade which is connected to the hand piece. A check is performed to determine the magnitude of the blade impedance at resonance. If the hand piece is bare (i.e. no blade is attached), the magnitude of the impedance at resonance is typically less than 125 ohms. If on the other hand, a blade is connected, the impedance will be greater that 125 ohms. This value is used to indicated the presence or absence of a blade.

L'invention permet de déterminer le type de lame installée dans une pièce à main d'un système à ultrasons, et l'information est utilisée pour ajuster le seuil de détection des défauts du générateur au moyen d'un diagramme d'impédance afin de déterminer le type de lame qui est reliée à la pièce à main. Une vérification est effectuée pour déterminer l'ampleur de l'impédance de la lame en résonance. Si la pièce à main est brute (c.-à-d., aucune lame n'y est attachée), l'ampleur de l'impédance en résonance est généralement de moins de 125 ohms. Si, par contre, une lame est reliée, l'impédance sera supérieure à 125 ohms. Cette valeur est utilisée pour indiquer la présence ou l'absence d'une lame.

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