Dual-use sensor for rate responsive pacing and heart sound monitoring
First Claim
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1. A cardiac rhythm management system comprising:
- a sensing circuit to sense at least one electrogram;
a pacing circuit to deliver pacing pulses;
a dual-use sensor to sense a signal indicative of activities and heart sounds;
a sensor processing circuit programmed to produce an activity level signal and a heart sound signal from the sensed signal, the sensor processing circuit including an input to receive the sensed signal indicative of activities and heart sounds, a first output representative of the activity level signal, and a second output representative of the heart sound signal; and
a controller coupled to the sensing circuit and the pacing circuit, the controller including;
a rate responsive pacing algorithm execution module to receive the activity level signal and dynamically adjust at least a pacing interval based on at least the activity level signal; and
a sensor processing circuit programming module coupled to the sensor processing circuit, the sensor processing circuit programming module programmed to program gains and cutoff frequencies for producing the activity level signal and the heart sound signal.
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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.
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Citations
79 Claims
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1. A cardiac rhythm management system comprising:
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a sensing circuit to sense at least one electrogram; a pacing circuit to deliver pacing pulses; a dual-use sensor to sense a signal indicative of activities and heart sounds; a sensor processing circuit programmed to produce an activity level signal and a heart sound signal from the sensed signal, the sensor processing circuit including an input to receive the sensed signal indicative of activities and heart sounds, a first output representative of the activity level signal, and a second output representative of the heart sound signal; and a controller coupled to the sensing circuit and the pacing circuit, the controller including; a rate responsive pacing algorithm execution module to receive the activity level signal and dynamically adjust at least a pacing interval based on at least the activity level signal; and a sensor processing circuit programming module coupled to the sensor processing circuit, the sensor processing circuit programming module programmed to program gains and cutoff frequencies for producing the activity level signal and the heart sound signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A cardiac rhythm management system comprising:
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an accelerometer to sense an acceleration signal indicative of physical activities and heart sounds; and a processing circuit having an input to receive the acceleration signal, the processing circuit including; a first amplifier having a programmable gain; and a first band-pass filter having one or more cutoff frequencies programmable for producing an activity level signal during first time periods and producing a heart sound signal during second time periods; and a controller coupled to the processing circuit, the controller including a processing circuit programming module programmed to program the gain and the one or more cutoff frequencies. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A cardiac rhythm management system comprising:
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an accelerometer to sense an acceleration signal; a first processing circuit including; a first input to receive the acceleration signal; a first output indicative of a physical activity level; and a first gain-and-filter circuit, coupled between the first input and the first output, to provide for a first gain and a first set of cutoff frequencies; and a second processing circuit including; a second input to receive the acceleration signal; a second output indicative of heart sounds; and a second gain-and-filter circuit, coupled between the second input and the second output, to provide for a second gain and a second set of cutoff frequencies. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A method comprising:
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sensing a signal indicative of activities and heart sounds using a single implantable sensor; programming gains and cutoff frequencies for producing an activity level signal and a heart sound signal using the sensed signal; processing the sensed signal to produce the activity level signal and the heart sound signal; executing a rate responsive pacing algorithm dynamically adjusting at least one pacing parameter based on the activity level signal; and detecting at least one type of heart sounds from the heart sound signal. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. A method comprising:
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sensing an acceleration signal indicative of an activity level and heart sounds; programming an amplifier with a first gain suitable for sensing the activity level for a first time period; programming a band-pass filter with a first set of cutoff frequencies suitable for sensing an activity level for the first time period; amplifying and filtering the sensed acceleration signal to produce an activity level signal; programming the amplifier with a second gain suitable for sensing the heart sounds for a second time period; programming the band-pass filter with a second set of cutoff frequencies suitable for sensing heart sounds for the second time period; and amplifying and filtering the sensed acceleration signal to produce a heart sound signal. - View Dependent Claims (66, 67, 68, 69, 70)
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71. A method comprising:
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sensing an acceleration signal; and producing an activity level signal and a heart sound signal concurrently from the acceleration signal, including; amplifying the acceleration signal with a first gain suitable for producing the activity level signal; filtering the acceleration signal with a first set of cutoff frequencies suitable for producing the activity level signal; amplifying the acceleration signal with a second gain suitable for producing the heart sound signal; and filtering the acceleration signal with a second set of cutoff frequencies suitable for producing the heart sound signal. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78, 79)
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Specification