Systems and methods for activity level pacing
First Claim
1. An implantable medical device (IMD) implantable within a patient'"'"'s heart, the IMD comprising:
- two or more sensors including a motion sensor;
a controller operatively coupled to the two or more sensors, the controller configured to;
identify a plurality of heart beats using one or more of the sensors, each of the plurality of heart beats having a systole phase and diastole phase;
identify each of two or more of the plurality of heart beats as an intrinsically initiated heart beat or a pace initiated heart beat;
identify a calibration time window, and during the calibration time window;
identify a baseline intrinsic motion level by identifying a motion level of the IMD using the motion sensor during N intrinsically initiated heart beats, where N is greater than two;
identify a baseline pace motion level by identifying a motion level of the IMD using the motion sensor during N pace initiated heart beats, where N is greater than two;
determine an offset based at least in part on the baseline intrinsic motion level and the baseline pace motion level;
after the calibration time window;
for an intrinsically initiated heart beat that immediately follows a pace initiated heart beat, identify a motion level of the IMD using the motion sensor and apply the offset, and compare the identified motion level of the IMD with the applied offset to a motion level of the IMD identified for the immediately preceding pace initiated heart beat, and identify a motion level of the patient based at least in part on the comparison; and
set a pacing rate parameter based at least in part on the identified motion level of the patient.
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Accused Products
Abstract
Systems, devices, and methods for pacing a heart of a patient are disclosed. An illustrative method may include determining a motion level of the patient using a motion sensor of an implantable medical device secured relative to a patient'"'"'s heart, and setting a pacing rate based at least in part on the patient'"'"'s motion level. The patient'"'"'s motion level may be determined by, for example, comparing the motion level sensed by the motion sensor during a current heart beat to a motion level associated with one or more previous heart beats. Noise may occur in the motion level measurements during those heart beats that transition between an intrinsically initiated heart beat and pace initiated heart beat. Various techniques may be applied to the motion level measurements to help reduce the effect of such noise.
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Citations
20 Claims
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1. An implantable medical device (IMD) implantable within a patient'"'"'s heart, the IMD comprising:
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two or more sensors including a motion sensor; a controller operatively coupled to the two or more sensors, the controller configured to; identify a plurality of heart beats using one or more of the sensors, each of the plurality of heart beats having a systole phase and diastole phase; identify each of two or more of the plurality of heart beats as an intrinsically initiated heart beat or a pace initiated heart beat; identify a calibration time window, and during the calibration time window; identify a baseline intrinsic motion level by identifying a motion level of the IMD using the motion sensor during N intrinsically initiated heart beats, where N is greater than two; identify a baseline pace motion level by identifying a motion level of the IMD using the motion sensor during N pace initiated heart beats, where N is greater than two; determine an offset based at least in part on the baseline intrinsic motion level and the baseline pace motion level; after the calibration time window; for an intrinsically initiated heart beat that immediately follows a pace initiated heart beat, identify a motion level of the IMD using the motion sensor and apply the offset, and compare the identified motion level of the IMD with the applied offset to a motion level of the IMD identified for the immediately preceding pace initiated heart beat, and identify a motion level of the patient based at least in part on the comparison; and set a pacing rate parameter based at least in part on the identified motion level of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for identifying an activity level of a patient using a motion sensor implanted within the patient'"'"'s heart, the method comprising:
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identifying a plurality of heart beats using the motion sensor, each of the plurality of heart beats having a systole phase and diastole phase; identifying each of two or more of the plurality of heart beats as an intrinsically initiated heart beat or a pace initiated heart beat; identifying a calibration time window, and during the calibration time window; identifying a baseline intrinsic motion level by identifying a motion level of the IMD using the motion sensor during N intrinsically initiated heart beats, where N is greater than two; identifying a baseline pace motion level by identifying a motion level of the IMD using the motion sensor during N pace initiated heart beats, where N is greater than two; determining an offset based at least in part on the baseline intrinsic motion level and the baseline pace motion level; and after the calibration time window; for an intrinsically initiated heart beat that immediately follows a pace initiated heart beat, identifying a motion level of the IMD using the motion sensor and apply the offset, and comparing the identified motion level of the IMD with the applied offset to a motion level of the IMD identified for the immediately preceding pace initiated heart beat, and identifying a motion level of the patient based at least in part on the comparison. - View Dependent Claims (14, 15, 16, 17)
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18. A leadless cardiac pacemaker (LCP) implantable within a patient'"'"'s heart, the LCP comprising:
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a housing; two or more electrodes secured relative to the housing, the two or more electrodes are configured to sense electrical signals of the patient'"'"'s heart; an accelerometer situated inside of the housing; circuitry situated inside of the housing and operatively coupled to the two or more electrodes and the accelerometer, the circuitry is configured to; identify a plurality of heart beats using two or more of the electrodes, each of the plurality of heart beats having a systole phase and diastole phase; identify each of two or more of the plurality of heart beats as an intrinsically initiated heart beat or a pace initiated heart beat; identify a calibration time window, and during the calibration time window; identify a baseline intrinsic motion level by identifying a motion level of the LCP using the accelerometer during the systole phase of N intrinsically initiated heart beats, where N is greater than two; identify a baseline pace motion level by identifying a motion level of the LCP using the accelerometer during the systole phase of N pace initiated heart beats, where N is greater than two; identify an offset based at least in part on the baseline intrinsic motion level and the baseline pace motion level; after the calibration time window; for an intrinsically initiated heart beat that immediately follows a pace initiated heart beat, identify a motion level of the LCP using the accelerometer during the systole phase of the intrinsically initiated heart beat and apply the offset, and compare the identified motion level of the LCP with the applied offset to a motion level of the LCP identified for the immediately preceding pace initiated heart beat, and identify a motion level of the patient based at least in part on the comparison; for a pace initiated heart beat that immediately follows an intrinsic initiated heart beat, identify a motion level of the LCP using the accelerometer during the systole phase of the pace initiated heart beat and apply the offset, and compare the identified motion level of the LCP with the applied offset to a motion level of the LCP identified for the immediately preceding intrinsically initiated heart beat, and identify a motion level of the patient based at least in part on the comparison; for an intrinsically initiated heart beat that immediately follows an intrinsically initiated heart beat, identify a motion level of the LCP using the accelerometer during the systole phase of the intrinsically initiated heart beat, and compare the identified motion level of the LCP to a motion level of the LCP identified for one or more previous intrinsically initiated heart beats, and identify a motion level of the patient based at least in part on the comparison; for a pace initiated heart beat that immediately follows a pace initiated heart beat, identify a motion level of the LCP using the accelerometer during the systole phase of the pace initiated heart beat, and compare the identified motion level of the LCP to a motion level of the LCP identified for one or more previous pace initiated heart beats, and identify the motion level of the patient based at least in part on the comparison; and set a pacing rate parameter based at least in part on the identified motion level of the patient. - View Dependent Claims (19, 20)
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Specification