A controller for an electrosurgical generator includes an RF inverter, a signal processor, a software compensator, a hardware compensator, and an RF inverter controller. The RF inverter generates an electrosurgical waveform and the signal processor outputs a measured value of at least one of a voltage, a current, or power of the electrosurgical waveform. The software compensator generates a desired value for at least one of the voltage, the current, or the power of the electrosurgical waveform, and the hardware compensator generates a phase shift based on the measured value and the desired value. The RF inverter controller generates a pulse-width modulation (PWM) signal based on the phase shift to control the RF inverter.

A cryosurgery system, comprising two or more cryoprobes is provided. Each cryoprobe includes a probe shaft having a distal section insertable in a patient and a proximal coupler. A connector interface with connection ports permits connections to a corresponding cryoprobe. Each connection port can have an isolating sleeve between the proximal coupler and the connection port when the proximal coupler of the respective cryoprobe is inserted in the connection port. The isolating sleeve can include an electrically insulating material so as to electrically isolate each cryoprobe connected to its corresponding connection port from other cryoprobes connected to their corresponding connection ports. An electrical measurement system can be connected to each connection port to detect electrical signals associated with the probe shaft. A control system can detect, based on the electrical signals detected by the electrical measurement system whether the probe shaft is electrically connected to the electrical heater.

An electrosurgical wand is disclosed for treating a plurality of tissues at a variety of tissue locations. The electrosurgical wand includes a handle on a proximal end and an elongate shaft with a combination active electrode at the distal end. The combination active electrode includes with a blade and screen portion; the blade portion extending along and laterally from the wand longitudinal axis, forming a dissecting tip. The screen portion extends from the blade portion at an obtuse angle and has at least one aspiration aperture through it. The wand also includes a second and third electrode, proximally spaced from the combination active electrode. The second electrode spans a portion of an outside surface of the wand adjacent the blade portion, while the third electrode spans a portion of the outside surface of the wand opposite the second electrode.

An ultrasonic surgical instrument and method for identifying tissue state and energizing the surgical instrument includes an end effector having an ultrasonic blade and an RF electrode, a shaft assembly, a body, and a power controller. A first ultrasonic energy input is configured to be actuated from a first unactuated energy input state to a first actuated energy input state. A trigger input is configured to be actuated from an unactuated trigger input state to an actuated trigger input state. The power controller is operatively connected to the ultrasonic blade, the RF electrode, the first ultrasonic energy input, and the trigger input and configured to direct at least one of the ultrasonic blade or the RF electrode to be selectively driven according to a predetermined drive function based on the tissue impedance, the state of the first energy input, and the state of the trigger input.

A medical apparatus includes a probe, which includes an insertion tube configured for insertion into a body cavity of a patient, and a distal assembly, which is connected distally to the insertion tube and includes a plurality of electrodes, which are configured to contact tissue within the body cavity. An electrical signal generator is configured to apply radio frequency (RF) signals simultaneously to the plurality of electrodes with energy sufficient to ablate the tissue contacted by the electrodes. A controller is coupled to measure time-varying voltage differences between the electrodes and to adjust the RF signals applied to the electrodes responsively to the measured time-varying voltage differences.

A method of performing an electrosurgical procedure includes activating an electrode of a surgical instrument by applying an output power signal with a first energy output profile from a generator to the electrode. An induced electrical parameter of a conductive component is monitored via one or more sensors, the induced electrical parameter being associated with a predetermined electrical parameter threshold. The induced electrical parameter includes a parasitic energy loss. When the induced electrical parameter measured from a conductive component of the surgical instrument meets or exceeds the predetermined electrical parameter threshold during the operation, the output power signal of the generator is adjusted from a first energy output profile to a second energy output profile. The adjustment is operable to reduce the induced electrical parameter measured from the conductive component of the surgical instrument; and to reduce the parasitic energy loss without ceasing delivery of energy to the electrode.

An electrosurgical system includes an instrument, an RF energy generator, and two ground pads. The instrument includes an electrode and a conductive shield that is configured to collect a capacitive coupling current that is induced by the application of RF energy to tissue by the electrode. A first electrical lead couples the first ground pad with the ground return of the conductive shield and the generator. The ground return is configured to divert a first portion of the capacitive coupling current to the generator via the first electrical lead. A second electrical lead couples the second ground pad with the ground return of the conductive shield and the generator. The ground return is configured to divert a second portion of the capacitive coupling current to the generator via the second electrical lead. The first and second portions of the capacitive coupling current are substantially equal.

A surgical instrument includes a shaft assembly, an end effector, a console, a conductor assembly, and voltage sensors. The shaft assembly has conductive components. The conductor assembly is configured to transfer power from the console to the end effector and includes a ground return path. Each of the conductive components is configured to couple with a corresponding one of the voltage sensors and with the ground return path. The voltage sensors are operable to measure a voltage potential difference of the coupled conductive component relative to a ground potential defined by the ground return path. The console is configured to determine whether the measured voltage potential difference exceeds a maximum threshold value. When the measured voltage potential difference exceeds the maximum threshold value, the console is further configured to initiate a corrective action.

A surgical system includes two instruments with corresponding end effectors that are operable to apply different types of energy to tissue of a patient. The system further includes one or more electrical power generators that are configured to generate first and second energy signals via corresponding generator outputs. A power monitor is configured to monitor a first energy parameter of the first energy signal and transmit the first energy parameter to the one or more electric power generators. The one or more electric power generators is configured to adjust a second energy parameter of the second energy signal, based at least in part on the transmitted first energy parameter, to avoid interactions between the first energy signal and the second energy signal.

An electrosurgical generator includes: a power supply configured to output a DC waveform; a power converter coupled to the power supply and configured to generate a radio frequency waveform based on the DC waveform; an active terminal coupled to the power converter and configured to couple to a first electrosurgical instrument and a second electrosurgical instrument; at least one sensor coupled to the power converter and configured to sense at least one property of the radio frequency waveform; and a controller coupled to the power converter. The controller is configured to: determine a first impedance associated with a first electrosurgical instrument and a second impedance associated with a second electrosurgical instrument based on the at least one property of the radio frequency waveform; and adjust at least one parameter of the radio frequency waveform based on the first impedance and the second impedance.