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Control circuit for an electrical device

  • US 4,123,673 A
  • Filed: 03/14/1977
  • Issued: 10/31/1978
  • Est. Priority Date: 03/14/1977
  • Status: Expired due to Term
First Claim
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1. A control circuit for a radiofrequency electrosurgical device including a radiofrequency generator, a handpiece, an active electrode means supported on the handpiece, and switch means mounted in the handpiece which comprises photovoltaic cell means and relay means connected in series with the switch means, means for illuminating the photovoltaic cell means, whereby closing of contacts of the switch means causes acturation of the relay means, and means connected to the relay means for causing the radiofrequency generator to power the active electrode, voltage at the switch means being limited by the voltage produced by the photovoltaic cell means.

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