Electrocardiogram filter
First Claim
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1. A device comprising:
- a first digital filter that receives a digital signal representative of a signal from a body and generates a pacemaker signal as a function of pacing pulses supplied by a pace maker; and
a second digital filter that receives the digital signal and generates an electrocardiogram signal.
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Abstract
The invention presents techniques for identifying signals detected by electrodes on the body of a patient as part of a reading of the patient'"'"'s electrocardiogram. A signal processor digitally filters the signal from the body, resulting in an electrocardiogram signal and a signal that identifies the presence and timing of signals from a pacemaker in the body. Other signals, such as a signal that reflects the quality of the electrical connection of the electrode to the body, may also be obtained by digital filtering.
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Citations
26 Claims
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1. A device comprising:
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a first digital filter that receives a digital signal representative of a signal from a body and generates a pacemaker signal as a function of pacing pulses supplied by a pace maker; and
a second digital filter that receives the digital signal and generates an electrocardiogram signal. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
an anti-aliasing filter that receives an analog signal from the body and generates a filtered analog signal; and
an analog-to-digital converter that receives the filtered analog signal and generates the digital signal.
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7. The device of claim 6, further comprising:
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a first electrode in contact with the body;
a second electrode in contact with the body; and
a difference amplifier that supplies the analog signal to the anti-aliasing filter as a function of the potential difference between the first electrode and the second electrode.
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8. The device of claim 7, further comprising:
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a third electrode in contact with the body;
a fourth electrode in contact with the body; and
a second difference amplifier that supplies a second analog signal to a second anti-aliasing filter as a function of the potential difference between the third electrode and the fourth electrode.
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9. The device of claim 1, further comprising an analog-to-digital converter that receives a filtered signal and supplies the digital signal to the first digital filter and the second digital filter.
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10. The device of claim 1, further comprising a processing system that includes the first digital filter and the second digital filter.
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11. The device of claim 10, the processing system further comprising a digital signal processor that performs the functions of the first digital filter and the second digital filter.
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12. The device of claim 1, further comprising a defibrillator that delivers a shock to the body as a function of the electrocardiogram signal.
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2. The device of 1, wherein the first digital filter passes frequency components above 300 Hz.
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13. A method comprising:
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digitally filtering an electrical signal representative of a signal from a body to generate a pacemaker signal as a function of pacing pulses supplied by a pacemaker; and
digitally filtering the electrical signal to generate an electrocardiogram signal. - View Dependent Claims (14, 15, 16, 17)
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18. A device comprising:
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an analog-to-digital converter that receives an electrical signal from a body and generates a digital signal; and
a processor that receives the digital signal and that digitally filters the digital signal to generate a pacemaker signal as a function of pacing pulses supplied by a pacemaker and digitally filters the digital signal to monitor an electrocardiogram signal. - View Dependent Claims (19, 20, 21, 22, 23, 24)
a first electrode in contact with the body;
a second electrode in contact with the body; and
a difference amplifier that supplies the electrical signal to the anti-aliasing filter as a function of the potential difference between the first electrode and the second electrode.
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21. The device of claim 20, further comprising:
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a third electrode in contact with the body;
a fourth electrode in contact with the body; and
a second difference amplifier that supplies a second electrical signal to a second anti-aliasing filter as a function of the potential difference between the third electrode and the fourth electrode.
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22. The device of claim 18, wherein the processor further digitally filters the digital signal to monitor the quality of an electrical connection of an electrode to the body.
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23. The device of claim 18, further comprising an optical coupling that conveys the digital signal from the analog-to-digital converter to the processor.
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24. The device of claim 18, further comprising a defibrillator that delivers a shock to the body as a function of the electrocardiogram signal.
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25. A method comprising:
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digitally filtering an electrical signal representative of a signal from a body to generate an electrocardiogram signal; and
simultaneously digitally filtering the electrical signal to generate a second patient signal. - View Dependent Claims (26)
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Specification