Power control for beam-type electrosurgical unit
Patent 4901720 Issued on February 20, 1990. Estimated Expiration Date: 
July 26, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 26, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesElectrosurgical method and apparatus for initiating an electrical discharge in an inert gas flow Electrosurgical method and apparatus for establishing an electrical discharge in an inert gas flow Electrosurgical conductive gas stream technique of achieving improved eschar for coagulation Patent #: 4781175 InventorApplicationNo. 224301 filed on 07/26/1988US Classes:606/40, Coagulation219/121.54, Control systems219/121.57Arc ignitionExaminersPrimary: Cohen, Lee S.Attorney, Agent or FirmInternational ClassA61B 017/39AbstractAn electrosurgical generator in an electrosurgical unit (ESU) controls the repetition rate and the energy content of bursts of RF energy delivered to a gas jet supplied by the ESU, in order to maintain RF leakage current within acceptable limits while still achieving a sufficient state of ionization in the gas jet to reliably initiate the conduction of arcs to the tissue. The repetition rate of the RF bursts is substantially reduced in an inactive state when no arcs are delivered. A relatively small number of the RF bursts delivered during the inactive state have an increased or boosted energy content to assure an adequate ionization state in the gas jet.Other References
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