公开(公告)号：EP0424685B1

公开(公告)日：1995-05-10

申请号：EP90118666.8

申请日：1990-09-28

Applicant: STORZ INSTRUMENT COMPANY

Inventor： Williams, Daniel L, Jr. ,  Kepley, Kevin P. ,  Painter, John A.

IPC: B06B1/02 ,  A61F9/00

CPC classification number: B06B1/0253 ,  A61B2017/00725 ,  A61B2017/00973 ,  A61F9/00745 ,  B06B2201/40 ,  B06B2201/76

公开(公告)号：EP0424685A2

公开(公告)日：1991-05-02

申请号：EP90118666.8

申请日：1990-09-28

Applicant: STORZ INSTRUMENT COMPANY

Inventor： Williams, Daniel L, Jr. ,  Kepley, Kevin P. ,  Painter, John A.

IPC: B06B1/02 ,  A61F9/00

CPC classification number: B06B1/0253 ,  A61B2017/00725 ,  A61B2017/00973 ,  A61F9/00745 ,  B06B2201/40 ,  B06B2201/76

Abstract: An electronic control system for determining the resonant frequency of and driving ultrasonic transducers in a phacoemulsification probe used for ophthalmic surgery. The control system includes a voltage control led oscillator, power amplifier, power monitor, and automatic gain control circuit operating under the direction of command signals received from a microprocessor-based control console. The control system operates in a constant apparent power, direct drive mode with closed loop feedback maintaining the electrical power provided to the primary of a RLC transformer at the constant level requested by the command signals from the console. The frequency of the drive signal is held at the dominant resonant frequency of the ultrasonic transducer which is being driven by the control system. This resonant frequency is determined via a calibration procedure performed when the probe is first attached to the control system. During this procedure a constant voltage drive signal is swept through a range of frequencies and the electrical power consumed by the transducer is measured and stored at selected intervals such as 100 Hertz increments. The resonant frequency is also determined in part by looking for the frequency at which maximum power is consumed by the probe. The stored data is also subjected to other tests to cheok that the peak is indeed a resonant frequency and that the probe has selected output power characteristics about this resonant frequency thus helping to ensure that the probe is capable of operating satisfactorily when driven by the control system.

Abstract translation: 一种用于确定用于眼科手术的晶状体乳化探针中的超声换能器的谐振频率和驱动超声换能器的电子控制系统。 该控制系统包括电压控制LED振荡器，功率放大器，功率监视器和自动增益控制电路，其工作方式是从基于微处理器的控制台接收到的命令信号。 控制系统以恒定的视在功率运行，具有闭环反馈的直接驱动模式，保持提供给来自控制台的命令信号所要求的恒定电平的RLC变压器的主电源。 驱动信号的频率保持在由控制系统驱动的超声换能器的主谐振频率上。 该谐振频率通过首先连接到控制系统时所执行的校准程序确定。 在此过程中，恒定电压驱动信号被扫过频率范围，并且以选定的间隔（例如100赫兹增量）测量和存储换能器消耗的电功率。 谐振频率也通过寻找探头消耗最大功率的频率来部分确定。 存储的数据也经受其他测试，以确定峰值确实是谐振频率，并且探头已经选择了关于该谐振频率的输出功率特性，从而有助于确保探头能够在由控制系统驱动时令人满意地运行 。

公开(公告)号：EP0424685A3

公开(公告)日：1992-02-26

申请号：EP90118666.8

申请日：1990-09-28

Applicant: STORZ INSTRUMENT COMPANY

Inventor： Williams, Daniel L, Jr. ,  Kepley, Kevin P. ,  Painter, John A.

IPC: B06B1/02 ,  A61F9/00

CPC classification number: B06B1/0253 ,  A61B2017/00725 ,  A61B2017/00973 ,  A61F9/00745 ,  B06B2201/40 ,  B06B2201/76

Abstract: An electronic control system for determining the resonant frequency of and driving ultrasonic transducers in a phacoemulsification probe used for ophthalmic surgery. The control system includes a voltage control led oscillator, power amplifier, power monitor, and automatic gain control circuit operating under the direction of command signals received from a microprocessor-based control console. The control system operates in a constant apparent power, direct drive mode with closed loop feedback maintaining the electrical power provided to the primary of a RLC transformer at the constant level requested by the command signals from the console. The frequency of the drive signal is held at the dominant resonant frequency of the ultrasonic transducer which is being driven by the control system. This resonant frequency is determined via a calibration procedure performed when the probe is first attached to the control system. During this procedure a constant voltage drive signal is swept through a range of frequencies and the electrical power consumed by the transducer is measured and stored at selected intervals such as 100 Hertz increments. The resonant frequency is also determined in part by looking for the frequency at which maximum power is consumed by the probe. The stored data is also subjected to other tests to cheok that the peak is indeed a resonant frequency and that the probe has selected output power characteristics about this resonant frequency thus helping to ensure that the probe is capable of operating satisfactorily when driven by the control system.