DUAL-USE SENSOR FOR RATE RESPONSIVE PACING AND HEART SOUND MONITORING
First Claim
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1. An implantable medical device, comprising:
- a pacing circuit configured to deliver pacing pulses;
an accelerometer configured to sense an acceleration signal indicative of physical activities and heart sounds;
a preconditioning circuit coupled to the accelerometer and configured to digitize the acceleration signal;
a sensor processing circuit coupled to the preconditioning circuit and programmable for producing an activity level signal and a heart sound signal using the preconditioned acceleration signal, the activity level signal indicative of a level of the physical activities, the heart sound signal indicative of the heart sounds, the sensor processing circuit including a first set of cutoff frequencies suitable for producing the activity level signal and a second set of cutoff frequencies suitable for producing the heart sound signal;
a controller coupled to the pacing circuit and the sensor processing circuit, the controller configured to program the sensor processing circuit and control the delivery of the pacing pulses using the activity level signal and the heart sound signal; and
an implantable housing encapsulating at least the pacing circuit, the preconditioning circuit, the sensor processing circuit, and the controller.
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Abstract
An implantable medical device includes a dual-use sensor such as a single accelerometer that senses an acceleration signal. A sensor processing circuit processes the acceleration signal to produce an activity level signal and a heart sound signal. The implantable medical device provides for rate responsive pacing in which at least one pacing parameter, such as the pacing interval, is dynamically adjusted based on the physical activity level. The implantable medical device also uses the heart sounds for pacing control purposes or transmits a heart sound signal to an external system for pacing control and/or diagnostic purposes.
99 Citations
20 Claims
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1. An implantable medical device, comprising:
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a pacing circuit configured to deliver pacing pulses; an accelerometer configured to sense an acceleration signal indicative of physical activities and heart sounds; a preconditioning circuit coupled to the accelerometer and configured to digitize the acceleration signal; a sensor processing circuit coupled to the preconditioning circuit and programmable for producing an activity level signal and a heart sound signal using the preconditioned acceleration signal, the activity level signal indicative of a level of the physical activities, the heart sound signal indicative of the heart sounds, the sensor processing circuit including a first set of cutoff frequencies suitable for producing the activity level signal and a second set of cutoff frequencies suitable for producing the heart sound signal; a controller coupled to the pacing circuit and the sensor processing circuit, the controller configured to program the sensor processing circuit and control the delivery of the pacing pulses using the activity level signal and the heart sound signal; and an implantable housing encapsulating at least the pacing circuit, the preconditioning circuit, the sensor processing circuit, and the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating an implantable medical device, the method comprising:
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sensing an acceleration signal indicative of physical activities and heart sounds using an accelerometer; digitizing the acceleration signal; producing an activity level signal by filtering the digitized acceleration signal using a first set of cutoff frequencies, the activity level signal indicative of a level of the physical activities; producing a heart sound signal by filtering the digitized acceleration signal using a second set of cutoff frequencies, the heart sound signal indicative of the heart sounds; and controlling delivery of cardiac pacing pulses from the implantable medical device using the activity level signal and the heart sound signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An implantable medical device, comprising:
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means for sensing an acceleration signal indicative of physical activities and heart sounds using an accelerometer; means for digitizing the acceleration signal; means producing an activity level signal by filtering the digitized acceleration signal using a first set of cutoff frequencies and producing a heart sound signal by filtering the digitized acceleration signal using a second set of cutoff frequencies, the activity level signal indicative of a level of the physical activities, the heart sound signal indicative of the heart sounds; and means for controlling delivery of cardiac pacing pulses from the implantable medical device using the activity level signal and the heart sound signal. - View Dependent Claims (19, 20)
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Specification