Failures associate with bad hand pieces and blade failures in an ultrasonic surgical system are distinguished by monitoring the rate of change of the resonance frequency and the rate of change of the resonance impedance of the hand piece/blade as the drive frequency is changed. As the system reaches...http://www.google.es/patents/US6756909?utm_source=gb-gplus-sharePatente US6756909 - Method for detecting blade breakage using rate and/or impedance information
Method for detecting blade breakage using rate and/or impedance information
