An electrosurgical system includes an end effector assembly including first and second jaw members each defining an electrically-conductive tissue-contacting surface. At least one of the jaw members is movable between spaced-apart and approximated positions for grasping tissue between the tissue-contacting surfaces. At least one temperature sensor is associated with the end effector assembly. An electrosurgical generator is configured to supply electrosurgical energy for treating tissue grasped between the tissue-contacting surfaces. The generator is configured to receive sensed data indicative of temperature from the temperature sensor and includes a controller configured, in real time, to control the supply of energy to tissue, predict thermal spread beyond the first and second jaw members based at least on the sensed temperature data, and modify, where it is determined that the predicted thermal spread is above a threshold thermal spread, the supply of energy to tissue to inhibit realization of the predicted thermal spread.

A surgical generator is disclosed including an ultrasonic generator module to provide at an ultrasonic drive signal for driving an ultrasonic surgical device and an electrosurgical generator module to provice an electrosurgical drive signal for driving an electrosurgical device. At least one of providing the ultrasonic drive signal or providing the electrosurgical drive signal includes recalling a waveform sample from a look-up table (LUT), modifying the waveform sample to generate a modified waveform based on voltage and current feedback information to pre-distort the waveform sample on a dynamic ongoing basis, indexing each stored voltage and current feedback data pair based on a corresponding LUT sample that was output when the voltage and current feedback data pair was acquired, synchronizing the LUT sample and the voltage and current feedback data pair to correct timing and stability of the pre-distorted waveform sample, and providing the modified waveform to an output stage.

A system for displaying characteristics of target tissue during an ablation procedure is provided that includes an electronic control unit (ECU) configured to receive data regarding electrical properties of the target tissue for a time period. The ECU is also configured to determine a value responsive to the data and indicative of at least one of a predicted depth of a lesion in the target tissue, a predicted temperature of the target tissue, and a likelihood of steam pop of the target tissue for the time period. The system further includes a display device operatively connected to the ECU. The display device is configured to receive the value and display a visual representation indicative of at least one of a predicted depth of a lesion in the target tissue, a predicted temperature of the target tissue, and a likelihood of steam pop of the target tissue for the time period.

An ablation system including an image database storing a plurality of computed tomography (CT) images of a luminal network and a navigation system enabling, in combination with an endoscope and the CT images, navigation of a locatable guide and an extended working channel to a point of interest. The system further includes one or more fiducial markers, placed in proximity to the point of interest and a percutaneous microwave ablation device for applying energy to the point of interest.

An exemplary ablation system is provided. The system is designed for safe and efficacious energy delivery into tissue by, for example, emitting energy in a controlled, repeatable manner that allows for feedback and energy emission titration based on sensed parameters (e.g., tissue temperature) measured during ablation. The system may include a switching antenna for both heating of target tissue and radiometry to monitor the temperature of the heated tissue. For example, the switching antenna may include a monopole formed by proximal and distal radiating elements, such that the proximal radiating element includes a short to defeat a choke action of the proximal radiating element. The system further includes a processor for calculating the temperature of the target tissue and estimating volume of the ablation lesion based on the target tissue temperature.

Various systems and methods for controlling an ultrasonic surgical instrument according to the location of tissue grasped within an end effector are disclosed. A control circuit can be configured to apply varying power levels, via a generator, to an ultrasonic transducer driving an ultrasonic electromechanical system to oscillate an ultrasonic blade. Further, the control circuit can measure impedances of the ultrasonic transducer corresponding to the varying power levels and determine a location of tissue positioned within the end effector according to a difference between the impedances of the ultrasonic transducer relative to a threshold.

Systems and methods for estimating tissue parameters, including mass of tissue to be treated and a thermal resistance scale factor between the tissue and an electrode of an energy delivery device, are disclosed. The method includes sensing tissue temperatures, estimating a mass of the tissue and a thermal resistance scale factor between the tissue and an electrode, and controlling an electrosurgical generator based on the estimated mass and the estimated thermal resistance scale factor. The method may be performed iteratively and non-iteratively. The iterative method may employ a gradient descent algorithm that iteratively adds a derivative step to the estimates of the mass and thermal resistance scale factor until a condition is met. The non-iterative method includes selecting maximum and minimum temperature differences and estimating the mass and the thermal resistance scale factor based on a predetermined reduction point from the maximum temperature difference to the minimum temperature difference.

This invention pertains a system and methods for ablation treatment of tissues. The invention aims to improve current models that allow predicting the volume and geometry of thermal ablations. Particularly the invention consists in a method that allows accounting for effects that occur when vapor that forms at the ablation site is able to seep in cavities that might encroach the ablation site and to deliver heat to the tissues of those cavities, creating an ablation geometry that is not described by current ablation models.

An ablation system including an image database storing a plurality of computed tomography (CT) images of a luminal network and a navigation system enabling, in combination with an endoscope and the CT images, navigation of a locatable guide and an extended working channel to a point of interest. The system further includes one or more fiducial markers, placed in proximity to the point of interest and a percutaneous microwave ablation device for applying energy to the point of interest.

A method is disclosed including immersing electrodes disposed on a distal end of an electrosurgical wand, the immersing in a cavity defined within walls of a first material, the cavity comprising a conductive fluid different than the first material, and the electrodes comprising a first electrode and a second electrode. The method further includes applying a voltage across the first electrode and the second electrode, the first and second electrode spaced apart on the distal end of the wand such that the conductive fluid resides between the first and second electrodes. The method further includes measuring an impedance of the conductive fluid between the first and second electrodes; and determining temperature of the conductive fluid based on the measured impedance. The method further includes forming plasma proximate to an active electrode distinct from the first and second electrode, the plasma created based on voltage applied to the active electrode.