#$%^&*AU2016262713A120161215.pdf#####ABSTRACT A phacoemulsification tip includes a shaft having a proximal end and a distal end, and a cutting edge portion at the distal end of the shaft. The cutting edge portion includes at least a first and a second bend. A geometry of the shaft and the at least first and second bend is configured to result in a lateral displacement of the shaft, perpendicular to the shaft, during ultrasonic torsional vibration of the tip, of less than approximately 5 to 25% of the lateral displacement at a distal end point of the tip throughout a shaft portion that extends from the proximal end of the shaft to the first bend of the cutting edge portion. The shaft length is selected to tune a twisting vibrational mode such that the twisting vibration is in resonance with an ultrasonic driving mechanism to increase twisting displacement at the distal end point of the tip.
