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;
for an intrinsically initiated heart beat, identify a motion level of the IMD using the motion sensor, and compare the identified motion level of the IMD to a motion level of the IMD 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, identify a motion level of the IMD using the motion sensor, and compare the identified motion level of the IMD to a motion level of the IMD 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.
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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; for an intrinsically initiated heart beat, identify a motion level of the IMD using the motion sensor, and compare the identified motion level of the IMD to a motion level of the IMD 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, identify a motion level of the IMD using the motion sensor, and compare the identified motion level of the IMD to a motion level of the IMD 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 (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, 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; for an intrinsically initiated heart beat, identifying a motion level of the IMD using the motion sensor, and comparing the identified motion level of the IMD to a motion level of the IMD identified for one or more previous intrinsically initiated heart beats and identifying the activity level of the patient based at least in part on the comparison; and for a pace initiated heart beat, identifying a motion level of the IMD using the motion sensor, and comparing the identified motion level of the IMD to a motion level of the IMD identified for one or more previous pace initiated heart beats and identifying the activity level of the patient based at least in part on the comparison. - View Dependent Claims (14, 15, 16)
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17. 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 patients 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 the two or more 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; for 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 but not any of the previous pace initiated heart beats, and identify an activity level of the patient based at least in part on the comparison; pace the patient'"'"'s heart at a pacing rate that is based at least in part on the identified activity level of the patient. - View Dependent Claims (18, 19, 20)
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Specification