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 and a secondary winding coupled to a load;
a driver configured to generate a sensor signal;
a primary converter configured to generate a primary converted signal as a function of the sensor signal;
a secondary converter configured to generate a secondary converted signal as a function of the sensor signal; and
a controller configured to determine a fault condition based on the primary and secondary converted signals.
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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 and a secondary winding coupled to a load; a driver configured to generate a sensor signal; a primary converter configured to generate a primary converted signal as a function of the sensor signal; a secondary converter configured to generate a secondary converted signal as a function of the sensor signal; and a controller configured to determine a fault condition based on the primary and secondary converted signals. - View Dependent Claims (2, 3, 4, 5, 6)
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- 7. The impedance monitoring circuit according to claim 1, wherein the controller is configured to determine a short circuit condition based on an amplitude of the primary converted signal being approximately 0 V.
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7-1. An impedance monitoring circuit for an electrosurgical generator, the monitoring circuit comprising:
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an isolation transformer coupled to an output stage of an electrosurgical generator, wherein the isolation transformer includes a primary winding and a secondary winding coupled to a load; a driver configured to generate a sensor signal; a primary converter configured to generate a primary converted signal as a function of the sensor signal; a reference resistor having a predetermined resistance coupled in series with the primary converter; a secondary converter configured to generate a secondary converted signal as a function of the sensor signal; and a controller configured to determine a fault condition based on the primary and secondary converted signals.
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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 through a reference resistor having a predetermined resistance coupled in series with a primary converter; detecting a primary converted signal and a secondary converted signal as a function of the sensor signal; 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