Patent ID: 11883326
Assignee: JOHNSON & JOHNSON SURGICAL VISION, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A phacoemulsification system, comprising:
a phacoemulsification probe comprising:
a probe body;
a vibrating portion disposed at least partially in the probe body, wherein the vibrating portion comprises a needle coupled with a horn and wherein the needle is configured to be inserted into an eye; and
a piezoelectric actuator disposed in the probe body and configured to vibrate the horn and the needle in a direction having a stroke length with respect to the probe body;
a signal generator configured to generate a drive signal to drive a vibration of the piezoelectric actuator;
a stroke measurement apparatus at least partially disposed in the probe body, the stroke measurement apparatus configured to measure the stroke length of the needle over time; and
a controller configured to perform respective adjustments of a frequency of the drive signal so as to maximize the stroke length and maintain mechanical resonance of the needle responsively to the provided measured stroke length.