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Energy delivery system for vessel sealing

  • US 5,827,271 A
  • Filed: 09/19/1995
  • Issued: 10/27/1998
  • Est. Priority Date: 09/19/1995
  • Status: Expired due to Term
First Claim
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1. An electrosurgical energy delivery system for sealing interior passageways of vessels of a patient, the system comprising:

  • a generator capable of delivering electrosurgical power by producing an output voltage and an output current, the generator having means for substantially terminating the power delivery to the surgical tool when the output current drops below approximately 200 milliamperes RMS;

    a surgical tool electrically connected to the generator for receiving the electrosurgical power, the surgical tool having electrically conductive members arranged for grasping the vessels of the patient and for transmitting the electrosurgical power thereto, the surgical tool having means for maintaining a closure force between the members sufficient to substantially close the interior passageways, anda power control circuit in the generator for automatically sequencing the electrosurgical power delivered to the surgical tool while the output voltage is kept below one-hundred-sixty volts RMS, wherein the sequence includes raising the output current to a maximum amplitude greater than about two amperes RMS while the surgical tool is applying the closure force, thereafter lowering the electrosurgical power to desiccate the vessels without charring, and hereafter terminating the electrosurgical power to the surgical tool.

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