Method and apparatus for sensing R-waves using both near field and far field sensing simultaneously
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United States of America Patent
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Apr 14, 1998
Grant Date -
N/A
app pub date -
Oct 24, 1995
filing date -
Oct 24, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a R-wave sensing system for an implantable cardiac arrythmia therapy device. In particular the present invention is a system having local detection electrodes for sensing a local electrical signal representing cardiac activity in a local area of a patient's heart and having global detection electrodes for sensing a global electrical signal representing cardiac activity in a global area of the patient's heart. First and second amplifiers for amplifying the local and global electrical signals detected are provided as are first and second filters for filtering the detected signals. A converter is provided for converting the local electrical signal detected by the local detection electrodes into a digital signal so as to generate a masking pulse. Finally, a multiplier is provided for combining the masking pulse with the filtered global electrical signal to produce a correlation signal which represents a more accurate sensing of the R-waves based on a combination of the local and global electrical signals.
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