Patent ID: 8277462

Claim:
A phacoemulsification apparatus, comprising: a handpiece comprising: a cutting tip configured to emulsify a lens; and piezoelectric elements configured to deflect the cutting tip; a regulator electrically connected to the handpiece to receive an actual value which is proportional to a voltage induced on the piezoelectric elements when the handpiece is constantly oscillating at its natural frequency, the regulator being configured to compare the actual value with a prescribed target value to determine a controlled variable; and a power amplifier having its input connected to the regulator to receive the controlled variable, and the power amplifier having its output connected to the handpiece, wherein, at the same time that the actual value is received by the regulator, the handpiece can be actuated and power can be output to the handpiece, so that direct feedback can be achieved and the handpiece can constantly oscillate at its natural frequency with deflection of the cutting tip in line with the controlled variable.