Covidien LP

Eximis Surgical, LLC

Tyco Healthcare Group LP

Steven C Rupp

Robert B Smith

Daniel A Friedrichs

James A Gilbert

Kristin D Johnson

William N Gregg

Dirk Johnson

Patrick J Digmann

A generator is configured to output two or more waveforms at different frequencies. In particular, the generator is configured to provide an ultrasonic waveform, which may be suitable for driving a transducer of an ultrasonic surgical instrument, and electrosurgical radiofrequency energy, which may be suitable for electrosurgical instruments.

Ultrasonic and radiofrequency energy production and control from a single power converter

A tissue segmentation device, controller, and methods therefore are disclosed. The device has an active electrode, a return electrode, a mechanical force application mechanism, voltage and current sensors, and a controller. The controller has a processing component, configured to assign a circuit status to a circuit comprising the at least one electrode. IF (PF≈0) and ((Vrms/Irms)≥T), THEN the circuit status is 'open'. IF (PF≈0) and ((Vrms/Irms)<T), THEN the circuit status is “short”. PF is a power factor of power applied to the electrosurgical device. T is a threshold value.

Electrosurgical device and methods

A tissue segmentation device, controller, and methods therefore are disclosed. The device has an active electrode, a return electrode, a mechanical force application mechanism, voltage and current sensors, and a controller. The controller has a processing component, configured to assign a circuit status to a circuit comprising the at least one electrode. IF (PF&#x2248;0) and ((Vrms/Irms)&#x2265;T), THEN the circuit status is 'open'. IF (PF&#x2248;0) and ((Vrms/Irms)&#x3c;T), THEN the circuit status is 'short'. PF is a power factor of power applied to the electrosurgical device. T is a threshold value.

An electrosurgical generator includes a power supply configured to output a DC waveform, a current or voltage source coupled to the power supply and a power converter coupled to the current or voltage source, the power converter including at least one power switching element and a power inductor having an inductance value during switching of the at least one power switching element. The electrosurgical generator further includes a zero voltage switching (ZVS) inducing circuit coupled to the power converter at a switching node, the ZVS inducing circuit including an inductor having an inductance which is greater than the inductance value of the power inductor of the at least one power switching element.

Ancillary circuit to induce zero voltage switching in a power converter

An electrosurgical generator is provided. The electrosurgical generator includes: a non-resonant radio frequency output stage configured to output a substantially square electrosurgical waveform; and a controller coupled to the non-resonant radio frequency output stage, the controller configured to adjust a crest factor of the substantially square electrosurgical waveform on a cycle-by-cycle basis.

Electrosurgical generator with continuously and arbitrarily variable crest factor

A system and method for return electrode monitoring are provided. The system includes an isolation circuit, a first controller, a second controller, and a detection circuit. The isolation circuit includes a transformer having a primary winding and a secondary winding. The first controller is coupled to the primary winding. The second controller and the detection circuit are coupled to the secondary winding. The detection circuit includes an interrogation signal circuit, a resonant tank filter, and a current-to-voltage converter. The interrogation signal circuit provides an interrogation signal to at least one electrode pad. The resonant tank filter filters a response signal received from the electrode pad. The current-to-voltage converter generates a voltage signal based on a current value of the response signal. The second controller generates a digital impedance value based on the voltage signal, and provides the digital impedance value to the first controller by way of the isolation circuit.

System and method for return electrode monitoring

An electronic device includes: a multilayered dielectric substrate including a plurality of dielectric layers; a planar magnetic device disposed on at least one internal dielectric layer of the plurality of dielectric layers; and an overlapping shield assembly including a first shield layer and a second shield layer separated by at least one of the plurality of dielectric layers.

Electrostatic shielding of planar magnetic devices of electrosurgical generators

A controller for an electrosurgical device and related methods and devices are disclosed. The controller has a processing component to: (a) derive a power factor of power applied to the electrosurgical device; and (b) responsive to the deriving a power factor, assign a circuit status to a circuit comprising the electrosurgical device. IF (PF&#x2248;0) and ((Vrms/Irms)&#x2265;T), THEN the circuit status is 'open'. IF (PF&#x2248;0) and ((Vrms/Irms)&#x3c;T), THEN the circuit status is 'short'. PF is the power factor. Vrms is the root mean square of a voltage associated with the power applied to the at electrosurgical device. Irms is the root mean square of a current associated with the power applied to the electrosurgical device. T is a threshold value.

An electrosurgical generator includes: a power supply configured to output a direct current; an energy metering stage including at least one metering switching component operated by a metering switching waveform, the energy metering stage configured to generate a metered energy packet from the direct current; a power converter coupled to the energy metering stage, the power converter including at least one power switching element operated by a power switching waveform, the power converter configured to generate a radio frequency half cycle based on the metered energy packet; and a controller coupled to the power converter, the controller is configured to modulate the metering switching waveform and the power switching waveform.

Electrosurgical generator with half-cycle power regulation

An electrosurgical generator includes: a power supply configured to output a DC waveform; a current or voltage source coupled to the power supply and configured to output current; and a power converter coupled to the current source. The power converter includes at least one power switching element operated at a switching waveform and configured to generate a radio frequency waveform based on the energy from the current or voltage source. The radio frequency waveform includes at least one pulse having an overshoot peak. The electrosurgical generator further includes a clipper circuit coupled to the current source and the power converter, the clipper circuit configured to generate a clipping voltage to clip the overshoot peak; and a controller coupled to the power converter and configured to modulate the switching waveform to generate the radio frequency waveform.

Variable active clipper circuit to control crest factor in an AC power converter

A thermal management system and method for electronic devices is provided. The system includes an electronic device, a heat sink, and a thermally conducting and electrically insulating thermal bridge that is interposed between the electronic device and the heat sink. The thermal bridge thermally couples the electronic device to the heat sink and electrically isolates the electronic device from the heat sink. The electronic device, the heat sink, and the thermal bridge are mounted on a same planar surface of a printed circuit board.

System and method for thermal management of electronic devices

The electrosurgical systems and methods of the present disclosure monitor power dosage delivered to tissue being treated with improved speed and accuracy. The electrosurgical systems include an output stage, sensors, analog all-pass filters, an analog multiplier, an average power calculation circuit, and a controller. The output stage generates electrosurgical energy to treat tissue. The plurality of sensors sense voltage and current waveforms of the generated electrosurgical energy. The plurality of analog all-pass filters filter the sensed voltage and current waveforms. The plurality of analog all-pass filter may have lagging or leading phase. The analog multiplier multiplies the filtered voltage and current waveforms to obtain a real power waveform. The average power calculation circuit calculates a real average power based on the real power waveform. The controller then generates a control signal to control the output stage based on the real average power.

Electrosurgical systems and methods for monitoring power dosage

A tissue segmentation device, controller, and methods therefore are disclosed. The device has an active electrode, a return electrode, a mechanical force application mechanism, voltage and current sensors, and a controller. The controller is configured to control a power output of the segmentation device. The controller has a processing component, responsive to the sensors, configured to execute the following: (a) derive a power factor of power applied to the at least one electrode; and (b) responsive to the deriving a power factor, assign a circuit status to a circuit comprising the at least one electrode. IF (PF&#x2248;0) and ((Vrms/Irms)&#x2267;T), THEN the circuit status is 'open'. IF (PF&#x2248;0) and ((Vrms/Irms)&#x3c;T), THEN the circuit status is 'short'. PF is the power factor. T is a threshold value.

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Arvada, CO, United States of America

Steven C Rupp