Ultrasonic transducer assembly for a surgical instrument and method of assembling the same

A method of assembling an ultrasonic transducer assembly, comprising:

• arranging a piezoelectric stack, a horn, a proximal end mass, and a rod to form an assembly whereby a distal end portion of the rod is secured to the horn, the piezoelectric stack is disposed about the rod proximally of the horn, and the end mass is disposed about the rod proximally of the piezoelectric stack;
• applying a longitudinal compressive force at least one of distally from the proximal end mass or proximally from the horn to compress the piezoelectric stack between the proximal end mass and the horn;
• and
• securing a proximal end portion of the rod to the proximal end mass to maintain a compression force on the piezoelectric stack between the proximal end mass and the horn.