Method and system for controlling output of RF medical generator
First Claim
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1. An electrosurgical system comprising:
- an electrosurgical generator adapted to supply electrosurgical energy to tissue;
a microprocessor configured to generate a target impedance trajectory having at least one slope, wherein the target impedance trajectory includes a plurality of target impedance values, the microprocessor also configured to drive tissue impedance along the target impedance trajectory by adjusting the output level to substantially match tissue impedance to a corresponding target impedance value, the microprocessor further configured to compare tissue impedance to a threshold impedance value and adjust output of the electrosurgical generator when the tissue impedance is equal to or greater than the threshold impedance; and
an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue, such that the tissue impedance is monitored in real-time in one or more closed loop control configurations by at least one control module that regulates the electrosurgical energy received from the generator, the one or more closed loop control configurations being an inner control loop configuration for controlling a first set of variables, the first set of variables selectively used to derive a second set of variables and an outer control loop configuration for providing additional control of a subset of at least one of the first and second sets of variables of the inner control loop.
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Abstract
An electrosurgical generator is disclosed. The generator includes a microprocessor configured to generate a target impedance trajectory having at least one slope. The target impedance trajectory includes a plurality of target impedance values. The microprocessor is configured to drive tissue impedance along the target impedance trajectory by adjusting the output level to substantially match tissue impedance to a corresponding target impedance value. The microprocessor is further configured to compare tissue impedance to a threshold impedance value and adjust output of the electrosurgical generator when the tissue impedance is equal to or greater than the threshold impedance.
1244 Citations
18 Claims
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1. An electrosurgical system comprising:
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an electrosurgical generator adapted to supply electrosurgical energy to tissue; a microprocessor configured to generate a target impedance trajectory having at least one slope, wherein the target impedance trajectory includes a plurality of target impedance values, the microprocessor also configured to drive tissue impedance along the target impedance trajectory by adjusting the output level to substantially match tissue impedance to a corresponding target impedance value, the microprocessor further configured to compare tissue impedance to a threshold impedance value and adjust output of the electrosurgical generator when the tissue impedance is equal to or greater than the threshold impedance; and an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue, such that the tissue impedance is monitored in real-time in one or more closed loop control configurations by at least one control module that regulates the electrosurgical energy received from the generator, the one or more closed loop control configurations being an inner control loop configuration for controlling a first set of variables, the first set of variables selectively used to derive a second set of variables and an outer control loop configuration for providing additional control of a subset of at least one of the first and second sets of variables of the inner control loop. - View Dependent Claims (2, 3, 4, 5)
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6. A method for performing an electrosurgical procedure comprising the steps of:
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applying electrosurgical energy at an output level to tissue from an electrosurgical generator; generating a target impedance trajectory, wherein the target impedance trajectory includes a plurality of target impedance values; driving tissue impedance along the target impedance trajectory by adjusting the output level to match tissue impedance to a corresponding target impedance value; and comparing tissue impedance to a threshold impedance value and adjusting output of the electrosurgical generator when the tissue impedance is equal to or greater than the threshold impedance, such that the tissue impedance is monitored in real-time in one or more closed loop control configurations by at least one control module that regulates the electrosurgical energy received from the generator, the one or more closed loop control configurations being an inner control loop configuration for controlling a first set of variables, the first set of variables selectively used to derive a second set of variables and an outer control loop configuration for providing additional control of a subset of at least one of the first and second sets of variables of the inner control loop. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. An electrosurgical generator comprising:
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an RF output stage adapted to supply electrosurgical energy to tissue; and a microprocessor configured to generate a target impedance trajectory having at least one slope, wherein the target impedance trajectory includes a plurality of target impedance values, the microprocessor also configured to drive tissue impedance along the target impedance trajectory by adjusting the output level to substantially match tissue impedance to a corresponding target impedance value, the microprocessor further configured to compare tissue impedance to a threshold impedance value and adjust output of the electrosurgical generator when the tissue impedance is equal to or greater than the threshold impedance, such that the tissue impedance is monitored in real-time in one or more closed loop control configurations by at least one control module that regulates the electrosurgical energy received from the generator, the one or more closed loop control configurations being an inner control loop configuration for controlling a first set of variables, the first set of variables selectively used to derive a second set of variables and an outer control loop configuration for providing additional control of a subset of at least one of the first and second sets of variables of the inner control loop. - View Dependent Claims (15, 16, 17, 18)
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Specification