A reactive gas application apparatus including an instrument (10) which includes: a plasma generating unit (12); and an outlet (1a) for blowing out a reactive gas activated by plasma, the plasma generating unit (12) including: a tubular dielectric (3) to which a plasma generation gas is introduced; an inner electrode (4) provided inside the tubular dielectric (3), and extending in a tube axis direction (O1) of the tubular dielectric (3); and an outer electrode (5) provided outside the tubular dielectric (3) and faces the inner electrode (4) through the tubular dielectric, wherein the inner electrode (4) has a shaft portion extending in the tube axis direction and a spiral ridge formed on an outer peripheral surface of the shaft portion.

The active electrode assembly for an electrosurgical device includes an electrically conductive shaft having opposed proximal and distal ends, the proximal end being adapted for connection to a conventional electrosurgical device. An electrically insulating sheath partially covers the distal end of the electrically conductive shaft. The electrically insulating sheath has a cut-out portion or recess formed therein, such that a portion of the distal end of the electrically conductive shaft is exposed therethrough. The exposed portion of the distal end defines an application surface for applying electrical current to the patient's tissue. The area surrounding the application surface remains covered by the electrically insulating sheath, thus providing electrically insulating protection for both the patient and the surgeon.

A method is disclosed for delivering energy to a region of tissue within a patient's body using a medical treatment system. The medical treatment system comprises an energy delivery device coupled to an energy source and the method includes steps of delivering energy, measuring an energy delivery parameter, determining distance of the energy delivery device from a conductive object and optionally adjusting a position of the energy delivery device based on the determined distance.

An electrosurgical generator includes an electrosurgical energy output configured to deliver electrosurgical energy to a bipolar end effector assembly in a conductive fluid environment for treating tissue. A controller having a processor is configured to control a waveform of the electrosurgical energy such that the waveform oscillates between a cut phase for initiating and sustaining tissue cutting, wherein the waveform includes a cut energy greater than the energy needed to create and sustain arcing, and a hemostasis phase, for desiccating/coagulating tissue, wherein the waveform includes a hemostasis energy less than the energy needed to sustain arcing.

An electrosurgical device for recognizing tissue by means of spectral analysis of the light generated at an electrode. An acoustic or optical indicator device displays the tissue type permanently or when detecting certain tissue. Indicators, in particular optical indicators, are arranged in the application field of view, so as to support the user in response to making an incision.

An electrosurgical resection instrument for applying to biological tissue radiofrequency electromagnetic energy has a protective hull comprising a shaped piece of dielectric material mounted to cover an underside of an instrument tip of the instrument. The protective hull acts as a shield to protect tissue that may lie under the instrument tip from damage during treatment. The instrument may be particularly useful in procedures performed in a gastrointestinal tract, where bowel perforation is a concern, or in the pancreas, where damage to the portal vein or the pancreatic duct may occur when a tumor or other abnormality is being resected, dissected or removed.

The disclosed systems and methods relate to controlling the application of electrosurgical energy by an electrosurgical instrument to minimizing arcing and subsequent wear of electrosurgical instruments. An electrosurgical generator in accordance with the present disclosure includes a processor and a memory storing instructions executable by the processor. When the instructions are executed, they cause the generator to provide an indicated treatment energy to the instrument, where the indicated treatment energy is set by a user and having a corresponding current limit, receive signals from the instrument over time relating to a load impedance between the active electrode and the return electrode of the instrument, determine based on the signals that the active electrode and the return electrode are currently shorted together, and prior to the short, the instrument was grasping tissue between the active electrode and the return electrode, and based on the determination, reduce a current limit of treatment energy being provided to the instrument to below the corresponding current limit.

A tissue cutting device has an outer sleeve with a distal window and an inner cutting sleeve which moves past the window to cut tissue. The inner cutting sleeve has a lumen which may have a larger proximal diameter than distal diameter. A perimeter of the window may comprise a dielectric material. A distal edge of the inner sleeve may be displaced inwardly.

A cutting device includes an elongated shaft that extends between a proximal end and a distal end. A distal arm extends from the distal end of the elongated shaft. The distal arm includes an inner surface defining a cavity and an outer surface defining a blunt tip. At least one proximal arm extends from the distal end of the elongated shaft at a position proximal to the distal arm. The at least one proximal arm having an inner surface defines a cavity including a cutting portion configured to cut tissue.

An electrode assembly is provided. The electrode assembly includes a proximal end that is adapted to connect to an electrosurgical instrument including a housing defining a longitudinal axis therethrough and an electrosurgical energy source. A distal end includes a cutting electrode having a loop configuration configured to cut tissue. The distal end includes a return electrode operably disposed adjacent the cutting electrode. A dielectric shield is operably disposed between the cutting electrode and return electrode. The dielectric shield extending distally past the cutting electrode to hinder current flow to the return electrode when the dielectric shield, cutting electrode and return electrode are submersed in a conductive solution and the cutting electrode is energized, thereby concentrating current density at the cutting electrode.