Dual-use sensor for rate responsive pacing and heart sound monitoring
First Claim
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1. An implantable medical device, comprising:
- a sensing circuit configured to sense at least one electrogram;
a pacing circuit configured to deliver pacing pulses;
a dual-use sensor configured to sense a signal indicative of physical activities and heart sounds;
a preconditioning circuit configured to precondition the sensed signal, the preconditioning circuit including a preconditioning amplifier having a preconditioning gain, a preconditioning band-pass filter having a set of preconditioning cutoff frequencies, and an analog-to-digital converter (ADC) to produce the preconditioned sensed signal by amplifying, filtering, and digitizing the sensed signal;
a sensor processing circuit configured to produce an activity level signal and a heart sound signal using the preconditioned sensed 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;
a first gain suitable for producing the activity level signal;
a second set of cutoff frequencies suitable for producing the heart sound signal; and
a second gain suitable for producing the heart sound signal;
an implant controller coupled to the sensing circuit, the pacing circuit, and the sensor processing circuit, the controller configured to 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 sensing circuit, the pacing 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 sensing circuit configured to sense at least one electrogram; a pacing circuit configured to deliver pacing pulses; a dual-use sensor configured to sense a signal indicative of physical activities and heart sounds; a preconditioning circuit configured to precondition the sensed signal, the preconditioning circuit including a preconditioning amplifier having a preconditioning gain, a preconditioning band-pass filter having a set of preconditioning cutoff frequencies, and an analog-to-digital converter (ADC) to produce the preconditioned sensed signal by amplifying, filtering, and digitizing the sensed signal; a sensor processing circuit configured to produce an activity level signal and a heart sound signal using the preconditioned sensed 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; a first gain suitable for producing the activity level signal; a second set of cutoff frequencies suitable for producing the heart sound signal; and a second gain suitable for producing the heart sound signal; an implant controller coupled to the sensing circuit, the pacing circuit, and the sensor processing circuit, the controller configured to 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 sensing circuit, the pacing circuit, the sensor processing circuit, and the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. The method for operating an implantable medical device, the method comprising:
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sensing a signal indicative of physical activities and heart sounds using a single implantable sensor; preconditioning the sensed signal, the preconditioning including amplifying, filtering, and digitizing the sensed signal using a preconditioning circuit of the implantable medical device; producing an activity level signal by filtering the preconditioned sensed signal using first cutoff frequencies and amplifying the preconditioned sensed signal using a first gain; producing a heart sound signal by filtering the preconditioned sensed signal using second cutoff frequencies and amplifying the preconditioned sensed signal using a second gain; 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 (11, 12, 13, 14, 15)
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16. An implantable medical device, comprising:
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means for sensing a signal indicative of physical activities and heart sounds using a single implantable sensor; means for preconditioning the sensed signal, including means for amplifying, filtering, and digitizing the sensed signal; and means for controlling gains and cutoff frequencies for producing an activity level signal and a heart sound signal using the preconditioned sensed signal. - View Dependent Claims (17, 18, 19, 20)
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Specification