Semiautomatic defibrillator with heart rate alarm driven by shock advisory algorithm

  • US 5,391,187 A
  • Filed: 02/22/1994
  • Issued: 02/21/1995
  • Est. Priority Date: 02/22/1994
  • Status: Expired due to Term
First Claim
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1. A semiautomatic cardiac defibrillator for receiving an ECG signal from a patient, providing an advisory indication to an operator, and allowing the operator to initiate delivery of a defibrillating shock to a patient through electrodes applied to the patient'"'"'s chest, said defibrillator comprising:

  • an input circuit for receiving an ECG signal from the patient;

    processing circuitry connected to the input circuit for processing the ECG signal to determine an average QRS rate and to determine whether to issue a shock advisory indication recommending delivery of a shock;

    a display for displaying the advisory indication to the operator;

    energy storage circuitry for generating a defibrillating shock for delivery to the patient;

    an output circuit for delivering the defibrillating shock to the electrodes;

    a manually operable switch controlling the output circuit, the switch being capable of being moved by the operator to a position in which a shock is delivered to the electrodes if there is an advisory indication recommending delivery of a shock; and

    a heart rate alarm circuit in which the inputs comprise an averaged QRS rate and the shock advisory indication.

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