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Implantable medical devices and programmers adapted for sensing vector selection

  • US 7,623,909 B2
  • Filed: 05/26/2006
  • Issued: 11/24/2009
  • Est. Priority Date: 05/26/2006
  • Status: Active Grant
First Claim
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1. A method of directing operation of an implantable cardiac stimulus system, the system comprising an implantable device having operational circuitry coupled to a plurality of sensing electrodes disposed within a patient and defining a plurality of sensing vectors for performing cardiac event detection, the system further comprising a programmer adapted for communication with the implantable device, the method comprising:

  • the programmer directing data capture by the implantable device using at least one of the plurality of sensing vectors; and

    the programmer analyzing at least one of the plurality of sensing vectors to determine suitability for cardiac event detection by use of the following method;

    the programmer receiving captured signal data from the implanted device;

    the programmer defining a fixed detection floor and a refractory period, the fixed detection floor being established as a fraction of an estimated maximum detection floor that the signals captured using a given sensing vector do not cross;

    the programmer identifying a series of detected events that cross the fixed detection floor outside of refractory periods, wherein a refractory period starts each time a detected event is identified;

    the programmer observing whether intervals between consecutive detected events are greater than a predetermined interval threshold and, if so, identifying a peak during a refractory period following a detection as a QRS Peak, and a peak during a fixed time period following the refractory period as a Noise Peak;

    elsethe programmer performing analysis to determine whether individual detected events are likely QRS or Noise events;

    and either;

    a) determining that a sensing vector is suitable for cardiac event detection;

    orb) determining that operator input is needed to complete a sensing vector selection process based on an inability of the programmer to parse individual detected events into likely QRS or Noise events; and

    following a determination that a sensing vector is suitable or following operator input to complete a sensing vector selection process, the programmer directing communication to the implantable device instructing the implantable device to perform cardiac signal analysis using a selected sensing vector as a default vector.

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