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Surgical generator for ultrasonic and electrosurgical devices

  • US RE47,996 E1
  • Filed: 10/26/2017
  • Issued: 05/19/2020
  • Est. Priority Date: 10/09/2009
  • Status: Active Grant
First Claim
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1. A surgical device, the surgical device comprising:

  • an end effector to act on tissue; and

    a control circuit configured for communication with a surgical generator, the control circuit comprising;

    a conductor pair to communicate with the surgical generator;

    a first circuit portion comprising;

    a first switch configured to switch between an open state and a closed state;

    a first resistor coupled in parallel with the first switch;

    a second switch configured to switch between an open state and a closed state; and

    a second resistor coupled in parallel with the second switch, wherein a combination of the first switch and the first resistor is coupled in series with a combination of the second switch and the second resistor;

    a voltage reference coupled in parallel with the first circuit portion,wherein the control circuit is configured to receive from the generator and over the conductor pair an interrogation signal, wherein a state of at least one of the first switch or the second switch is determined from at least one characteristic of the interrogation signal;

    a capacitor coupled in parallel with the first circuit portion;

    a resistor coupled in series parallel with the first circuit portion; and

    a memory device coupled to the first circuit portion.

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