Patent ID: 7285895

Claim:
An ultrasonic surgical device comprising: a transducer assembly adapted to vibrate at an ultrasonic frequency in response to electrical energy, the transducer assembly comprising: alternating annular positive and negative electrodes and annular piezoelectric elements in alternating relationship with the electrodes to form a stack having a longitudinal axis; a mounting device having a first end and a second end, the mounting device adapted to receive ultrasonic vibration from the stack and to transmit the ultrasonic vibration form the first end to the second end of the mounting device; a bolt comprising a head and a shaft, the shaft threadedly engaged with the mounting device; and a deformable pressure element comprising a substantially central opening sized to permit insertion of the shaft therethrough, the deformable pressure element having a convex side facing the bolt head and a concave side facing the stack in a non-deformed state, the deformable pressure element, in a deformed state, applying compression forces to the stack based on the deformation; a transmission rod having a first end and a second end, the transmission rod adapted to receive ultrasonic vibration form the transducer assembly and to transmit the ultrasonic vibration from the first end to the second end of the transmission rod; and an end effector having a first end and a second end, the end effector adapted to receive the ultrasonic vibration from the transmission rod and to transmit the ultrasonic vibration from the first end to the second end of the end effector.