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Method and apparatus for determining electrode/tissue contact

  • US 5,836,990 A
  • Filed: 09/19/1997
  • Issued: 11/17/1998
  • Est. Priority Date: 09/19/1997
  • Status: Expired due to Term
First Claim
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1. A method for determining electrode/tissue contact comprising the following steps:

  • choosing a constant current pulsed signal or a constant voltage pulsed signal, said chosen pulsed signal comprising a series of signal pulses;

    applying said series of signal pulses to an electrode, each said signal pulse having a leading edge portion and a following portion;

    placing the electrode into contact with a tissue site;

    the placing step taking place with an ionic liquid covering the tissue site; and

    determining when the electrode contacts the tissue by monitoring a chosen electrical characteristic at the electrode during a period of time before, during, and after the electrode contacts the tissue.

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