Portable digital heart rate meter/ stethoscope

Details Portable digital heart rate meter/ stethoscope Portable digital heart rate meter/ stethoscope

A - Human Necessities

61

B

326/13.2

A61B 5/02 (2006.01) A61B 5/024 (2006.01) A61B 7/04 (2006.01)

Patent

CA 1143014

ABSTRACT OF THE DISCLOSURE Electrical signals corresponding to heart sounds detected by a pulse/sound transducer are filtered in a narrow bandpass filter whose pass band is centred on a characteristic heart sound frequency of 33Hz. The filter improves signal-to-noise ratio and enables the transducer to be used over a patient's clothing. The unfiltered signal is amplified and fed to bi- naural leads to provide the function of an electronic stethoscope. In addition, the filtered signal is converted into pulses in response to which a count corresponding to the detected heart rate is established in a counter and displayed as a digital heart rate indication.

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