Electrosurgical generator

Patent metadata

Field	Value
Publication number	US-9844404-B2
Application number	US-201514808856-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Apr 10, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

An electrosurgical system for performing an electrosurgical procedure is provided and includes an electrosurgical generator and a calibration computer system. The electrosurgical generator includes one or more processors and a measurement module including one or more log amps that are in operative communication with the processor. The calibration computer system configured to couple to a measurement device and is configured to measure parameters of an output signal generated by the electrosurgical generator. The calibration computer system is configured to compile the measured parameters into one or more data look-up tables and couple to the electrosurgical generator for transferring the data look-up table(s) to memory of the electrosurgical generator. The microprocessor is configured to receive an output from the log amp(s) and access the data look-up table(s) from memory to execute one or more control algorithms for controlling an output of the electrosurgical generator.

First claim

What is claimed is:

1. A computer calibration system for calibrating measurement circuitry of an electrosurgical device, the computer calibration system comprising:
a measurement device configured to measure an output of the electrosurgical device, the measurement device including at least one log amp;
a memory that stores measurement data including a plurality of current and voltage values of the at least one log amp, a plurality of gain values of the log amp, a plurality of current and voltage values of the electrosurgical device, and a plurality of impedance values of a load coupled to the electrosurgical device;
a processor configured to execute at least one control algorithm to compile the measurement data into at least one data look-up table, to calculate a slope and a gain of the at least one log amp, and to correct a variation of the at least one log amp using a piece-wise linear fit of the gain relative to an output of the at least one log amp; and
a communication interface configured to transfer the at least one data look-up table to a memory of the electrosurgical device.

2. The computer calibration system according to claim 1 , wherein the at least one log amp is configured to receive an output from a sensor configured to sense an output of the electrosurgical device.

3. The computer calibration system according to claim 1 , wherein the measurement device is an RMS current sensing device, wherein the measurement device includes a current sensing toroid that is configured to measure an output current of the electrosurgical device.

4. The computer calibration system according to claim 1 , wherein the slope and the gain of the at least one log amp are calculated based on a dynamic operating range of the at least one log amp.

5. The computer calibration system according to claim 4 , wherein the at least one log amp is adjustable to obtain an optimum slope through the dynamic operating range.

Assignees

• Covidien Lp

Inventors

• Behnke Ii Robert J
• Heckel Donald W
• Smith Robert B
• Krapohl James E

Classifications

• A61B18/14

  Probes or electrodes therefor · CPC title

• A61B2018/00827

  Current · CPC title

• A61B2018/00648

  using more than one sensed parameter · CPC title

• A61B18/1445

  at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod · CPC title

• A61B2018/00892

  Voltage · CPC title