Please download the dossier by clicking on the dossier button x
×

Methods and apparatus for controlling a pacing system in the presence of EMI

  • US 20030144705A1
  • Filed: 05/10/2002
  • Published: 07/31/2003
  • Est. Priority Date: 01/29/2002
  • Status: Active Grant
First Claim
Patent Images

1. In a cardiac pacing system operating in a pacing mode by:

  • timing out a pacing escape interval that establishes a pacing rate;

    delivering a pacing pulse to a heart chamber upon time-out of the pacing escape interval;

    sensing a characteristic feature of the electrogram of the heart in the heart chamber during time-out of the pacing escape interval and generating a sense event; and

    restarting the pacing escape interval upon generation of a sense event, a method of operating the pacing system to respond to the presence of electromagnetic interference tending to corrupt the features of the electrogram comprising;

    accumulating data from the sense events and delivered pacing pulses over a predetermined time interval and deriving a mean heart rate from the accumulated data;

    detecting electromagnetic interference tending to corrupt the features of the electrogram and declaring an interference state;

    adjusting the pacing escape interval to provide an interference state pacing rate exceeding the mean heart rate by a predetermined increment; and

    operating the pacing system in the interference state pacing mode at the interference state pacing rate, whereby the patient'"'"'s heart is paced while minimizing occurrences of parasystole.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×