×

Implantable medical devices using heuristic filtering in cardiac event detection

  • US 7,623,913 B2
  • Filed: 08/01/2006
  • Issued: 11/24/2009
  • Est. Priority Date: 08/01/2006
  • Status: Active Grant
First Claim
Patent Images

1. A method of cardiac signal analysis comprising:

  • capturing a cardiac signal using implanted electrodes;

    conditioning and amplifying the signal;

    performing analog-to-digital conversion on the signal; and

    applying a heuristic filter to the captured cardiac signal by repeatedly performing the following at a predetermined interval;

    a) calculating an actual quiescent point of the analog-to-digital converted signal; and

    b) adjusting the analog-to-digital conversion of the signal to modify the actual quiescent point toward a desired quiescent point; and

    adjusting the predetermined interval by calculating a quiescent distance between the actual quiescent point and the desired quiescent point; and

    ;

    x) reducing the predetermined interval if the quiescent distance is greater than a first threshold;

    y) increasing the predetermined interval if the quiescent distance is less than a second threshold;

    orz) if the quiescent distance is between the first and second thresholds, making no adjustment to the predetermined interval.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×