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Determining onset of cardiac depolarization and repolarization waves for signal processing

  • US 9,737,223 B2
  • Filed: 07/31/2015
  • Issued: 08/22/2017
  • Est. Priority Date: 05/13/2015
  • Status: Active Grant
First Claim
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1. A system for use in monitoring cardiac signals comprising:

  • a memory;

    an electrode apparatus comprising a plurality of electrodes configured to be located proximate tissue of a patient;

    display apparatus comprising a graphical user interface, wherein the graphical user interface is configured to present information for use in assisting a user in determining accurate onset data for depolarization of a heart;

    computing apparatus coupled to the electrode apparatus and display apparatus, wherein the computing apparatus is configured to;

    a) determine whether a signal acquired from a channel associated with an electrode from the plurality of electrodes is valid and sufficiently strong;

    b) eliminate one or more channels that acquire invalid signals;

    c) determine whether one or more remaining channels acquire sufficiently strong signals to allow onset data to be calculated;

    d) in response to determining one or more remaining channels acquire sufficiently strong signals;

    (1) determine beat information including first local maximum for each beat;

    (2) store the first local maximum for each beat into said memory;

    (3) determine whether a square of a first derivative of a signal is smaller than a preselected percentage of the first local maximum for the beat; and

    e) in response to determining whether a square of a first derivative is smaller than the preselected percentage of the first local maximum, update the onset data for the beat.

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