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Biphasic defibrillation isolation circuit and method

  • US 5,674,266 A
  • Filed: 06/27/1996
  • Issued: 10/07/1997
  • Est. Priority Date: 06/27/1996
  • Status: Expired due to Fees
First Claim
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1. An external defibrillator high voltage patient isolation circuit for selectively delivering and isolating high voltage biphasic waveform defibrillation pulses, the patient isolation circuit comprising:

  • a biphasic pulse generating circuit;

    a diode bridge circuit having diodes connected between an input terminal and an output terminal and having a pair of intermediate terminals, wherein one of the input and output terminals is connected to the biphasic pulse generating circuit and the other of the input and output terminals is adapted for connection to defibrillation electrodes;

    a pair of solid state switching devices connected together in series across the pair of intermediate terminals; and

    a pair of resistors, with each one of the pair of resistors connected across one of the pair of switching devices to balance voltages across the switching deviceswherein the isolation circuit will provide a high impedance to block biphasic high voltages at either of the input or output terminal from appearing at the other of the input or output terminal when the switching devices are OFF, and a low impedance between the input and output terminals to provide a path for biphasic defibrillation pulses between the biphasic pulse generating circuit and the terminal adapted for connection to defibrillation electrodes when the switching devices are ON.

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