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Defibrillation pacing circuitry

  • US 20050288714A1
  • Filed: 06/07/2005
  • Published: 12/29/2005
  • Est. Priority Date: 11/05/2001
  • Status: Active Grant
First Claim
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1. A circuit configured for placement inside an implantable cardiac stimulus device and operating from battery power, the circuit comprising:

  • an H-bridge circuit including first and second high side switches and first and second low side switches, each of the switches including an input, an output, and a control terminal, the output of the first high side switch electrically coupled to the input of the first low side switch at a node coupled to a first output for the device, the output of the second high side switch electrically coupled to the input of the second low side switch at a node coupled to a second output for the device;

    a resistor coupled in parallel to an opt-out switch placed in series with the output of the first low side switch; and

    control circuitry coupled to the control terminal of the first low side switch and taking a feedback signal from the output of the first low side switch, the control circuitry configured such that;

    when a pulse is applied with the opt-out switch closed to short out the resistor, the first low side switch operates as an “

    ON”

    switch; and

    when a pulse is applied with the opt-out switch open, the first low side switch causes a constant current to run through the patient.

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