公开(公告)号：US20250046442A1

公开(公告)日：2025-02-06

申请号：US18780763

申请日：2024-07-23

Applicant: Alcon Inc.

Inventor： Guangyao Jia ,  Kurt D. Leukanech ,  Satish Yalamanchili

IPC: G16H40/60 ,  A61B17/00

Abstract: A controller for an ultrasonic handpiece having a load in the form of at least one piezoelectric drive crystal includes a processor and a computer-readable storage memory on which is recorded a computer-readable instruction set. Execution of the instruction set during real-time operation of the handpiece causes the processor to perform an associated method, during which the processor calculates a load capacitance of the load and a dissipation factor of the load capacitance. The processor also records the load capacitance and dissipation factor in memory over time as a recorded capacitance history. The processor then executes a control action of the handpiece using the recorded capacitance history and possibly one or more additional recorded electrical parameters such as estimated resistance, estimated inductance, and/or measured temperature, or correlations of the same with resonant frequency over time.

公开(公告)号：US20230270591A1

公开(公告)日：2023-08-31

申请号：US18173864

申请日：2023-02-24

Applicant: Alcon Inc.

Inventor： James Y. Chon ,  Ahmad Salehi ,  Kurt D. Leukanech ,  Satish Yalamanchili ,  Dan Teodorescu ,  Ho Man Michael Fong

IPC: A61F9/007

CPC classification number: A61F9/00745 ,  A61B2017/00402

Abstract: An ultrasonic handpiece includes a piezoelectric element assembly. Control signals drive the piezoelectric element assembly simultaneously in a first mode of oscillation and a second mode of oscillation. Feedback of a resulting oscillation of the piezoelectric element assembly in the first mode and the second mode is generated. Based on the feedback, the frequency of each of the first mode and second mode is independently adjusted, as needed, so that the resulting oscillation of each of the first mode and the second mode is each approximately at its respective resonant frequency.

公开(公告)号：US20250041116A1

公开(公告)日：2025-02-06

申请号：US18782278

申请日：2024-07-24

Applicant: Alcon Inc.

Inventor： Guangyao Jia ,  Ho Man Michael Fong ,  Kurt D. Leukanech ,  Collin Shane Wasson ,  Satish Yalamanchili

IPC: A61F9/007 ,  A61B17/00 ,  A61B90/00 ,  G16H20/40 ,  G16H40/63

Abstract: Embodiments of the present disclosure generally relate to systems and methods for measuring intraocular pressure (IOP) during ophthalmic surgery. In some embodiments, a method for measuring IOP is provided. The method includes measuring fluid pressure in a fluid flow path of a handpiece device using a pressure sensor disposed therein to obtain a fluid pressure measurement, determining a sensor temperature measurement of the pressure sensor, determining a predicted sensor zero offset based on the sensor temperature measurement using a determined zero offset correlation function, and adjusting the fluid pressure measurement with the predicted sensor zero offset to obtain an adjusted fluid pressure measurement.