Method and apparatus for third heart sound detection
First Claim
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1. A heart sound detection system, comprising:
- an acoustic signal input adapted to receive an acoustic signal indicative of heart sounds; and
a heart sound detector coupled to the acoustic signal input, the heart sound detector including;
an S2 detector adapted to detect second heart sounds (S2) using the acoustic signal;
an S3 window generator adapted to generate an S3 window in response to each detection of S2;
an S3 detector adapted to detect third heart sounds (S3) using the acoustic signal and an S3 threshold during the S3 windows;
a measurement module adapted to detect an acoustic energy using the acoustic signal; and
an S3 threshold generator adapted to determine the S3 threshold using the acoustic energy.
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Abstract
A cardiac rhythm management system includes a heart sound detector providing for detection of the third heart sounds (S3). An implantable sensor such as an accelerometer or a microphone senses an acoustic signal indicative heart sounds including the second heart sounds (S2) and S3. The heart sound detector detects occurrences of S2 and starts S3 detection windows each after a predetermined delay after a detected occurrence of S2. The occurrences of S3 are then detected from the acoustic signal within the S3 detection windows.
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Citations
24 Claims
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1. A heart sound detection system, comprising:
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an acoustic signal input adapted to receive an acoustic signal indicative of heart sounds; and a heart sound detector coupled to the acoustic signal input, the heart sound detector including; an S2 detector adapted to detect second heart sounds (S2) using the acoustic signal; an S3 window generator adapted to generate an S3 window in response to each detection of S2; an S3 detector adapted to detect third heart sounds (S3) using the acoustic signal and an S3 threshold during the S3 windows; a measurement module adapted to detect an acoustic energy using the acoustic signal; and an S3 threshold generator adapted to determine the S3 threshold using the acoustic energy. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A heart sound detection method, comprising:
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receiving an acoustic signal indicative of heart sounds; detecting second heart sounds (S2) using the acoustic signal; generating an S3 window following each of the detected S2; detecting third heart sounds (S3) during the S3 windows by comparing the acoustic signal to an S3 threshold; detecting an acoustic energy using the acoustic signal; and dynamically adjusting the S3 threshold using the acoustic energy. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A heart sound detection system, comprising:
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an acoustic signal input to receive an acoustic signal indicative of heart sounds; and a heart sound detector coupled to the acoustic signal input, the heart sound detector including; an S2 detector adapted to detect second heart sounds (S2) using the acoustic signal; an S3 window generator adapted to generate an S3 window in response to each detection of S2; an S3 detector adapted to detect third heart sounds (S3) during the S3 windows using the acoustic signal and an S3 threshold; and an S3 threshold generator adapted to determine the S3 threshold using an estimated background sound level (μ
B) measured during a period between an occurrence of first heart sounds (S1) and an adjacent occurrence of S2. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A heart sound detection method, comprising:
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receiving an acoustic signal indicative of heart sounds; detecting second heart sounds (S2) using the acoustic signal; generating an S3 window following each of the detected S2; detecting third heart sounds (S3) during the S3 windows by comparing the acoustic signal to a dynamically adjustable S3 threshold; and dynamically adjusting the S3 threshold using an estimated background sound level (μ
B) measured during a period between an occurrence of first heart sounds (S1) and an adjacent occurrence of S2. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification