Method and apparatus for sensing R-waves using both near field and far field sensing simultaneously
First Claim
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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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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Citations
20 Claims
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1. An R-wave sensing system for an implantable cardiac arrythmia therapy device, the system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An R-wave sensing system for an implantable cardiac arrythmia therapy device, the system comprising:
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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 amplifier that amplifies the local electrical signal; a second amplifier that amplifies the global electrical signal; a first filter that filters the local electrical signal; a second filter that filters the global electrical signal; a converter that converts the local electrical signal into a digital signal so as to generate a masking pulse; and a multiplier that multiplies 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. - View Dependent Claims (9, 10)
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11. An R-wave sensing system for an implantable cardiac arrythmia therapy device, the system comprising:
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local detection means for sensing a local electrical signal representing cardiac activity in a local area of a patient'"'"'s heart; global detection means for sensing a global electrical signal representing cardiac activity in a global area of the patient'"'"'s heart; a first filtering means for filtering the local electrical signal so as to generate a masking pulse; a second filtering means for filtering the global electrical signal; and multiplication means for multiplying 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. - View Dependent Claims (12, 13, 14, 15)
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16. A method of sensing R-waves in an implantable cardiac arrythmia therapy device, the method comprising the steps of:
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detecting local electrical signals of a patient'"'"'s heart representing cardiac activity in a local area of the heart; detecting global electrical signals representing cardiac activity in a global area of the patient'"'"'s heart; filtering the local electrical signals so as to generate a masking signal; filtering the global electrical signals; and combining the masking signal with the filtered global signals to produce a correlation signal representative of an R-wave sensed in the patient'"'"'s heart. - View Dependent Claims (17, 18, 19, 20)
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Specification