Method for differentiating between burdened and cracked...

A - Human Necessities – 61 – B

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A61B 17/32 (2006.01) A61F 9/007 (2006.01) G01H 15/00 (2006.01) A61B 17/00 (2006.01)

Patent

CA 2359142

A method for differentiating between ultrasonically tuned blades which are broken or cracked, and blades which are gunked by evaluating measured impedance differences when a system is first excited with a low displacement signal and then with a high displacement signal. The method is performed irrespective of the age of the hand piece/blade, the temperature or specific type of hand piece or blade, and is not affected by self healing effects of slightly cracked blades. Moreover, the method facilitates the quantifiable determination of the amount of gunk on the blade. Absolute impedance measurements of the transducer or blade are unnecessary. Instead, only relative impedance measurements are required, which greatly simplifies the measuring criteria. This provides a way to measure the amount of gunk accumulation, and thereby a way to calculate/estimate the amount of heat generated at the sheath, as well as a way to calculate/estimate the amounts of degradation to the load curve of the ultrasonic system.

Une méthode de différenciation entre des lames accordées aux ultrasons qui sont brisées ou fendues et celles qui sont chargées (dépôts), par évaluation des différences d'impédance mesurées lorsque le système est d'abord excité à l'aide d'un signal à faible déplacement, puis à l'aide d'un signal à déplacement plus grand. La méthode est exécutée sans tenir compte de l'âge de l'instrument de coupe/lame, de la température ou du type particulier d'instrument de coupe/lame, et sans qu'elle soit touchée par les effets de régénération naturelle de lames légèrement fissurées. De plus, la méthode facilite la détermination quantifiable de la quantité de dépôt sur la lame. La mesure absolue de l'impédance du transducteur ou de la lame est superflue. € la place, seule la mesure relative de l'impédance est requise, ce qui simplifie considérablement les critères de mesure. On peut ainsi mesurer la quantité de dépôts accumulés et donc calculer/estimer la quantité de chaleur générée à la gaine, ainsi que le degré de dégradation par rapport à la courbe de charge du dispositif à ultrasons.

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