MONITORING OF HEART SOUNDS
First Claim
1. A system comprising:
- an implantable heart sound sensor circuit configured to produce an electrical heart sound signal representative of a heart sound of a subject;
a respiration sensor configured to produce a respiration signal representative of respiration of the subject;
a processor circuit coupled to the heart sound sensor circuit and the second sensor circuit, wherein the processor circuit includes;
a detection circuit configured to detect a phase of the respiration cycle using the respiration signal;
a heart sound feature circuit configured to identify a heart sound feature in the electrical heart sound signal in relation to the detected phase of the respiration cycle; and
a trending circuit configured to trend a difference between the identified heart sound feature during the detected phase of the respiration cycle and outside the detected phase of the respiration cycle, andwherein the processor circuit is configured to generate an indication of a change in a physiologic condition of the patient according to the trend and provide the indication to a user or process.
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Accused Products
Abstract
A system comprises an implantable medical device (MID) including an implantableimplantabie heart sound sensor circuit configured to produce an electrical heart sound signal representative of a heart sound of a subject and a processor circuit. The processor circuit is coupled to the heart sound sensor circuit and includes a detection circuit, a heart sound feature circuit and a trending circuit. The detection circuit configured to detect a physiologic perturbation and the heart sound feature circuit is configured to identify a heart sound feature in the electrical signal. The processor circuit is configured to trigger the heart sound feature circuit in relation to a detected physiologic perturbation. The trending circuit is configured to trend the heart sound feature in relation to a recurrence of the physiologic perturbation. The processor circuit is configured to declare a change in a physiologic condition of the patient according to the trending.
3 Citations
20 Claims
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1. A system comprising:
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an implantable heart sound sensor circuit configured to produce an electrical heart sound signal representative of a heart sound of a subject; a respiration sensor configured to produce a respiration signal representative of respiration of the subject; a processor circuit coupled to the heart sound sensor circuit and the second sensor circuit, wherein the processor circuit includes; a detection circuit configured to detect a phase of the respiration cycle using the respiration signal; a heart sound feature circuit configured to identify a heart sound feature in the electrical heart sound signal in relation to the detected phase of the respiration cycle; and a trending circuit configured to trend a difference between the identified heart sound feature during the detected phase of the respiration cycle and outside the detected phase of the respiration cycle, and wherein the processor circuit is configured to generate an indication of a change in a physiologic condition of the patient according to the trend and provide the indication to a user or process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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sensing a respiration signal representative of respiration of the subject; detecting a phase of the respiration cycle using the respiration signal; sensing an electrical heart sound signal representative of a heart sound of a subject; identifying a heart sound feature in the electrical heart sound signal in relation to the detected phase of the respiration cycle; trending a difference between the identified heart sound feature during the detected phase of the respiration cycle and outside the detected phase of the respiration cycle; and generating an indication of a change in a physiologic condition of the patient according to the trend and provide the indication to a user or process. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification