System and Method for Augmented Impedance Sensing
First Claim
1. An impedance monitoring circuit for an electrosurgical generator, the monitoring circuit comprising:
- an isolation transformer coupled to at least one of an active terminal and a return terminal of an electrosurgical generator, wherein the isolation transformer includes a primary winding coupled to a reference resistor and a secondary winding coupled to a load;
a driver configured to transmit a sensor signal to the reference resistor and the load;
a primary converter coupled to the reference resistor and the load and configured to detect a primary converted signal as a function of the sensor signal passing through the reference resistor and the load;
a secondary converter coupled to the driver and configured to detect a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load; and
a controller including a preprogrammed offset value, wherein the controller is configured to determine a fault condition based on the primary and secondary converted signals and the offset value.
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Accused Products
Abstract
An impedance monitoring circuit for an electrosurgical generator is disclosed. The monitoring circuit includes an isolation transformer coupled to at least one of an active terminal and a return terminal of an electrosurgical generator, wherein the isolation transformer includes a primary winding coupled to a reference resistor and a secondary winding coupled to a load. The monitoring circuit also includes a driver configured to transmit a sensor signal to the reference resistor and the load, a primary converter coupled to the reference resistor and the load and configured to detect a primary converted signal as a function of the sensor signal passing through the reference resistor and the load. The monitoring circuit further includes a secondary converter coupled to the driver and configured to detect a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load and a controller configured to determine a fault condition based on the primary and secondary converted signals.
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Citations
18 Claims
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1. An impedance monitoring circuit for an electrosurgical generator, the monitoring circuit comprising:
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an isolation transformer coupled to at least one of an active terminal and a return terminal of an electrosurgical generator, wherein the isolation transformer includes a primary winding coupled to a reference resistor and a secondary winding coupled to a load; a driver configured to transmit a sensor signal to the reference resistor and the load; a primary converter coupled to the reference resistor and the load and configured to detect a primary converted signal as a function of the sensor signal passing through the reference resistor and the load; a secondary converter coupled to the driver and configured to detect a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load; and a controller including a preprogrammed offset value, wherein the controller is configured to determine a fault condition based on the primary and secondary converted signals and the offset value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An impedance monitoring circuit for an electrosurgical generator, the monitoring circuit comprising:
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an isolation transformer coupled to at least one of an active terminal and a return terminal of an electrosurgical generator, wherein the isolation transformer includes a primary winding coupled to a reference resistor and a secondary winding coupled to a load; a driver configured to transmit a sensor signal to the reference resistor and the load; a primary converter coupled to the reference resistor and the load and configured to detect a primary converted signal as a function of the sensor signal passing through the reference resistor and the load; a secondary converter coupled to the driver and configured to detect a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load; and a controller configured to determine a fault condition based on the primary and secondary converted signals. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for detecting a fault in an impedance monitoring circuit, the method comprising the steps of:
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transmitting a sensor signal to a reference resistor coupled to a primary winding of an isolation transformer and a load coupled to a secondary winding of the isolation transformer; detecting a primary converted signal as a function of the sensor signal passing through the reference resistor and the load; detecting a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load; and determining a fault condition based on the primary and secondary converted signals. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification