Patent ID: 7172420

Claim:
Ultrasonic shaping instrument including: a mount structure ( 10 ), a sonotrode ( 14 ) elastically mounted on the mount structure ( 10 ), a tool ( 16 ) fixed to the sonotrode ( 14 ) for carrying out shaping operations, and a control unit ( 12 ) for controlling and powering the sonotrode ( 14 ), characterized in that it is dimensioned such that: the assembly formed by the sonotrode ( 14 ) and the tool ( 16 ) has an ultrasonic resonant frequency fo, in a mode selected from among traction-compression and torsion, capable of varying between a lower limit fomin and an upper limit fomax, and it does not itself have any other resonant frequency within a range comprised between a frequency fpmin <fomin and a frequency fpmax> fomax, and in that the control unit ( 12 ) is of the type generating a sinusoidal signal frequency modulated by a quasi-random signal, so as to apply a passband electric signal comprised between a minimum frequency femin and a maximum frequency femax, femin being comprised in the interval fpminâ€“fomin and femax in the interval fomaxâ€“fpmax.