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US 11,684,785 B2Granted
Dynamic patient-specific filtering of an activity signal within a beating heart
AssigneeMedtronic, Inc.
InventorsTodd J. Sheldon, Wade M. Demmer, Karen J. Kleckner, Douglas A. Peterson, Paul R. Solheim
Life of this patent
Estimating the term…
Abstract
An implantable medical device includes an activity sensor, a pulse generator, and a control module. The control module is configured to determine activity metrics from the activity signal and determine an activity metric value at a predetermined percentile of the activity metrics. The control module sets a lower pacing rate set point based on the activity metric value at the predetermined percentile.
Claims20
An implantable cardiac device comprising:
- a housing configured to be implanted within a heart of a patient;
- an accelerometer positioned within the housing, the accelerometer configured to generate an accelerometer signal;
- and
- a control circuit configured to:
- determine, based on application of one or more thresholds to the accelerometer signal, a plurality of activity metrics based on a portion of the accelerometer signal over a first time period, wherein each activity metric of the plurality of activity metrics indicates an amount of motion of the accelerometer during a respective window of time within the first time period;
- identify a first set of activity metrics including each activity metric of the plurality of activity metrics that is less than a threshold activity metric, wherein the first set of activity metrics correspond to heart motion when the patient is at rest;
- identify a second set of activity metrics including each activity metric of the plurality of activity metrics that is greater than the threshold activity metric;
- filter, from the plurality of activity metrics, the first set of activity metrics corresponding to heart motion when the patient is at rest so that the filtered plurality of activity metrics includes the second set of activity metrics without including the first set of activity metrics, wherein the filtered plurality of activity metrics corresponds to the portion of the accelerometer signal over the first time period;
- determine, based on the filtered plurality of activity metrics, a pacing rate;
- and
- cause a pulse generator to generate pacing pulses over a second time period at the pacing rate, wherein the second time period occurs after the first time period.
8 more elements
A method comprising:
- determining, by a control circuit of an implantable cardiac device based on application of one or more thresholds to an accelerometer signal, a plurality of activity metrics based on a portion of the accelerometer signal over a first time period, wherein the implantable cardiac device comprises a housing configured to be implanted within a heart of a patient, and wherein the implantable cardiac device comprises an accelerometer positioned within the housing, the accelerometer configured to generate the accelerometer signal, wherein each of the plurality of activity metrics indicates an amount of motion of the accelerometer during a respective window of time within the first time period;
- identifying, by the control circuit, a first set of activity metrics including each activity metric of the plurality of activity metrics that is less than a threshold activity metric, wherein the first set of activity metrics correspond to heart motion when the patient is at rest;
- identifying, by the control circuit a second set of activity metrics including each activity metric of the plurality of activity metrics that is greater than the threshold activity metric;
- filtering, by the control circuit from the plurality of activity metrics, the first set of activity metrics corresponding to heart motion when the patient is at rest so that the filtered plurality of activity metrics includes the second set of activity metrics without including the first set of activity metrics, wherein the filtered plurality of activity metrics corresponds to the portion of the accelerometer signal over the first time period;
- determining, by the control circuit based on the filtered plurality of activity metrics, a pacing rate;
- and
- causing, by the control circuit, a pulse generator to generate pacing pulses over a second time period at the pacing rate, wherein the second time period occurs after the first time period.
4 more elements
A non-transitory computer-readable medium configured to store instructions that, when executed, cause one or more processors to:
- determine, based on application of one or more thresholds to an accelerometer signal generated by an accelerometer positioned within a housing of an implantable cardiac device, a plurality of activity metrics based on a portion of the accelerometer signal over a first time period, wherein the housing is configured to be implanted within the heart of the patient, wherein each of the plurality of activity metrics indicates an amount of motion of the accelerometer during a respective window of time within the first time period;
- identify a first set of activity metrics including each of the plurality of activity metrics that is less than a threshold activity metric, wherein the first set of activity metrics correspond to heart motion when the patient is at rest;
- identify a second set of activity metrics including each of the plurality of activity metrics that is greater than the threshold activity metric;
- filter, from the plurality of activity metrics, the first set of activity metrics corresponding to heart motion when the patient is at rest so that the filtered plurality of activity metrics includes the second set of activity metrics without including the first set of activity metrics, wherein the filtered plurality of activity metrics corresponds to the portion of the accelerometer signal over the first time period;
- determine, based on the filtered plurality of activity metrics, a pacing rate;
- and
- cause a pulse generator to generate pacing pulses over a second time period at the pacing rate, wherein the second time period occurs after the first time period.
4 more elements
Dependencies are inferred from the claim text.