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Method and apparatus for sensing R-waves using both near field and far field sensing simultaneously

  • US 5,738,105 A
  • Filed: 10/24/1995
  • Issued: 04/14/1998
  • Est. Priority Date: 10/24/1995
  • Status: Expired due to Fees
First Claim
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1. An R-wave sensing system for an implantable cardiac arrythmia therapy device, the system comprising:

  • local detection electrodes that sense a local electrical signal representing cardiac activity in a local area of a patient'"'"'s heart;

    global detection electrodes that sense a global electrical signal representing cardiac activity in a global area of the patient'"'"'s heart;

    a first filter that filters the local electrical signal so as to generate a masking pulse;

    a second filter that filters the global electrical signal; and

    means for combining the masking pulse with the filtered global electrical signal to produce a correlation signal representative of an R-wave sensed in the patient'"'"'s heart.

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