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; and
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 patient status indicator using information related to the acceleration correlative to the S1 heart sound;
wherein the patient status indicator indicates at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle; and
wherein the device is configured to detect an auxiliary physiological signal in conjunction with detection of the acceleration correlative to the S1 heart sound, the control circuit configured to use the auxiliary physiological signal in determining the patient status indicator, the auxiliary physiological signal including a motion-related acceleration.
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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.
134 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; and 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 patient status indicator using information related to the acceleration correlative to the S1 heart sound; wherein the patient status indicator indicates at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle; and wherein the device is configured to detect an auxiliary physiological signal in conjunction with detection of the acceleration correlative to the S1 heart sound, the control circuit configured to use the auxiliary physiological signal in determining the patient status indicator, the auxiliary physiological signal including a motion-related acceleration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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; determining a patient status indicator using information about the acceleration correlative to the S1 heart sound, wherein the patient status indicator indicates at least one of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle; and detecting an auxiliary physiological signal in conjunction with detection of the acceleration correlative to the S1 heart sound, the auxiliary physiological signal being used in determining the patient status indicator, wherein the auxiliary physiological signal includes a motion-related acceleration. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A device comprising:
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a transducer configured to convert an acceleration correlative to a S1 heart sound into an electrical signal; and 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 indicates at least on of contractility or a maximum time rate of change of pressure within a ventricle of a heart during a cardiac cycle; and wherein the device is configured to alter an electrode site selection parameter based on the contractility or the maximum time rate of change of pressure within the ventricle of the heart during the cardiac cycle.
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Specification