Activity sensor processing for phrenic nerve activation detection
First Claim
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1. An implantable medical device, comprising:
- a pulse generator configured to deliver cardiac pacing to a heart;
an accelerometer configured to generate an acceleration signal at an accelerometer output terminal;
a first filter channel configured to attenuate first frequencies of the acceleration signal to produce a first physiological signal, wherein the first physiological signal provides a measure of a patient'"'"'s respiration;
a second filter channel, separate from the first filter channel, the second filter channel configured to attenuate second frequencies of the acceleration signal to produce a second physiological signal indicative of phrenic nerve activation; and
circuitry configured to;
determine one or more characteristics of a patient'"'"'s state based at least in part on the first physiological signal, identify a phase of respiration of the patient using the first physiological signal, to detect phrenic nerve activation in a time relation to the phase of respiration caused by cardiac pacing during the phase of respiration based at least in part on the second physiological signal, and to adjust a value of at least parameter of the cardiac pacing based on detected phrenic nerve activation.
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Abstract
An implantable cardiac device includes a sensor for sensing patient activity and detecting phrenic nerve activation. A first filter channel attenuates first frequencies of the sensor signal to produce a first filtered output. A second filter channel attenuates second frequencies of the accelerometer signal to produce a second filtered output. Patient activity is evaluated using the first filtered output and phrenic nerve activation caused by cardiac pacing is detected using the second filtered output.
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Citations
18 Claims
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1. An implantable medical device, comprising:
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a pulse generator configured to deliver cardiac pacing to a heart; an accelerometer configured to generate an acceleration signal at an accelerometer output terminal; a first filter channel configured to attenuate first frequencies of the acceleration signal to produce a first physiological signal, wherein the first physiological signal provides a measure of a patient'"'"'s respiration; a second filter channel, separate from the first filter channel, the second filter channel configured to attenuate second frequencies of the acceleration signal to produce a second physiological signal indicative of phrenic nerve activation; and circuitry configured to;
determine one or more characteristics of a patient'"'"'s state based at least in part on the first physiological signal, identify a phase of respiration of the patient using the first physiological signal, to detect phrenic nerve activation in a time relation to the phase of respiration caused by cardiac pacing during the phase of respiration based at least in part on the second physiological signal, and to adjust a value of at least parameter of the cardiac pacing based on detected phrenic nerve activation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical device, comprising:
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a pulse generator configured to deliver cardiac pacing; an accelerometer configured to generate an acceleration signal at an accelerometer output terminal; circuitry coupled to the accelerometer output terminal, the circuitry configured to have a first set of signal processing characteristics that produce a first physiological signal, the circuitry configured to have a second set of signal processing characteristics that produces a second physiological signal, the first physiological signal indicative of respiration and the second physiological signal indicative of phrenic nerve activation, wherein at least some of the first signal processing characteristics are different from at least some of the second signal processing characteristics; and the circuitry configured to;
determine one or more characteristics of a patient'"'"'s state based at least in part on the first physiological signal, identify a phase of respiration of the patient using the first physiological signal, to detect phrenic nerve activation in a time relation to the identified phase of respiration caused by cardiac pacing during the phase of respiration based at least in part on the second physiological signal. - View Dependent Claims (16)
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17. A method of operating an implantable medical device, comprising:
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sensing one or more characteristics of a patient using an accelerometer, and generating a sensor signal at a sensor output terminal of the accelerometer; filtering the sensor signal through separate filter channels to produce a first physiological signal and a second physiological signal, the separate filter channels comprising a first filter channel having first filter characteristics configured to attenuate a first set of frequencies from the sensor signal and a second filter channel having second filter characteristics configured to attenuate a second set of frequencies from the sensor signal; detecting one or more characteristics of respiration using the first physiological signal; detecting, in a time relation to an identified phase of respiration, phrenic nerve activation caused by cardiac pacing during the identified phase of respiration using the second physiological signal; and producing an output in response to detecting phrenic nerve activation. - View Dependent Claims (18)
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Specification