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Pulse detection apparatus, software, and methods using patient physiological signals

  • US 8,744,577 B2
  • Filed: 08/07/2012
  • Issued: 06/03/2014
  • Est. Priority Date: 09/30/1999
  • Status: Expired due to Fees
First Claim
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1. An electrotherapy device, comprising:

  • a first sensor, that is adapted to be external to and adapted to be placed on a patient, and configured to sense a photodetection signal in a patient that includes a pulse oximetry signal;

    a second sensor, that is adapted to be external to and adapted to be placed on a patient, and configured to receive an impedance-sensing signal from the patient;

    an electrotherapy generator, that is external to the patient, and is configured for delivering pacing stimuli to the patient through skin of the patient; and

    processing circuitry, that is adapted to be external to the patient, and configured to analyze the photodetection signal for features indicative of a cardiac pulse and to analyze the impedance-sensing signal for a fluctuation due to a cardiac pulse, the processing circuitry also configured to average the analyzed photodetection signal and the analyzed the impedance-sensing signal, and determine, based on the averaged photodetection signal and the averaged impedance-sensing signal, whether the cardiac pulse occurred in the patient following the delivery of a pacing stimulus of the pacing stimuli of the patient, the processing circuitry increasing the current of further pacing stimuli to be delivered to the patient if a cardiac pulse did not occur in the patient following the delivery of the pacing stimulus.

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