Sensing rate of change of pressure in the left ventricle with an implanted device
First Claim
1. A device comprising:
- a transducer configured to convert an acceleration correlative to a S1 heart sound into an electrical signal;
a control circuit coupled to the transducer, the control circuit configured to receive the electrical signal, identify the acceleration correlative to the S1 heart sound, determine a maximum amplitude of the acceleration correlative to the S1 heart sound and a minimum amplitude of the acceleration correlative to the S1 heart sound, and determine a patient status indicator using an indication of a peak-to-peak difference between the maximum amplitude of the acceleration correlative to the S1 heart sound and the minimum amplitude of the acceleration correlative to the S1 heart sound, wherein the patient status indicator is correlative to at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle, wherein the control circuit is configured to use an auxiliary physiological signal to select the accelerations used in the determination of the patient status indicator, the auxiliary physiological signal indicative of at least one of physical activity or respiration.
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Abstract
An implantable device and method for monitoring S1 heart sounds with a remotely located accelerometer. The device includes a transducer that converts heart sounds into an electrical signal. A control circuit is coupled to the transducer. The control circuit is configured to receive the electrical signal, identify an S1 heart sound, and to convert the S1 heart sound into electrical information. The control circuit also generates morphological data from the electrical information. The morphological data relates to a hemodynamic metric, such as left ventricular contractility. A housing may enclose the control circuit. The housing defines a volume coextensive with an outer surface of the housing. The transducer is in or on the volume defined by the housing.
130 Citations
20 Claims
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1. A device comprising:
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a transducer configured to convert an acceleration correlative to a S1 heart sound into an electrical signal; a control circuit coupled to the transducer, the control circuit configured to receive the electrical signal, identify the acceleration correlative to the S1 heart sound, determine a maximum amplitude of the acceleration correlative to the S1 heart sound and a minimum amplitude of the acceleration correlative to the S1 heart sound, and determine a patient status indicator using an indication of a peak-to-peak difference between the maximum amplitude of the acceleration correlative to the S1 heart sound and the minimum amplitude of the acceleration correlative to the S1 heart sound, wherein the patient status indicator is correlative to at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle, wherein the control circuit is configured to use an auxiliary physiological signal to select the accelerations used in the determination of the patient status indicator, the auxiliary physiological signal indicative of at least one of physical activity or respiration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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using a transducer to detect an acceleration correlative to an S1 heart sound; converting the acceleration correlative to S1 heart sound into an electrical signal using the transducer; using the electrical signal to determine a maximum amplitude of the acceleration correlative to the S1 heart sound and a minimum amplitude of the acceleration correlative to the S1 heart sound; and determining a patient status indicator using an indication of a peak-to-peak difference between the maximum amplitude of the acceleration correlative to the S1 heart sound and the minimum amplitude of the acceleration correlative to the S1 heart sound, wherein the patient status indicator is correlative to at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle, wherein an auxiliary physiological signal is used to select the accelerations used in the determination of the patient status indicator, the auxiliary physiological signal indicative of at least one of physical activity or respiration. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A non-transitory device-readable medium including instructions that, when performed by the device, comprise:
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using a transducer to detect an acceleration correlative to an S1 heart sound; converting the acceleration correlative to S1 heart sound into an electrical signal using the transducer; using the electrical signal to determine a maximum amplitude of the acceleration correlative to the S1 heart sound and a minimum amplitude of the acceleration correlative to the S1 heart sound; and determining a patient status indicator using an indication of a peak-to-peak difference between the maximum amplitude of the acceleration correlative to the S1 heart sound and the minimum amplitude of the acceleration correlative to the S1 heart sound, wherein the patient status indicator is correlative to at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle, wherein an auxiliary physiological signal is used to select the accelerations used in the determination of the patient status indicator, the auxiliary physiological signal indicative of at least one of physical activity or respiration. - View Dependent Claims (19, 20)
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Specification