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Method and apparatus for measuring blood pressure by instantaneous comparison of multiple frequency-range components of Korotkoff noise
Method and apparatus for measuring blood pressure by instantaneous comparison of multiple frequency-range components of Korotkoff noise
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机译:通过瞬时比较科罗特科夫噪声的多个频率范围分量来测量血压的方法和设备
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摘要
To improve the accuracy of blood pressure measurement by utilizing the Korotkoff noises, the frequency spectrum of the Korotkoff noises is analyzed, either by a plurality of filters (16, 17, 18; FIG. 1) or by a Fast Fourier Transform (FFT) system (54, 55; FIG. 2). If a plurality of filters are used (FIG. 1), which may be analog or digital, then the output amplitudes are rectified (19, 20, 21) and quotients are formed. If the quotients have a predetermined relationship, as determined by a discriminator (27, 28), a control logic provides output signals to a manometer (31) to indicate, respectively, systolic and diastolic blood pressure. For Fast Fourier Transform, a microprocessor can be used which, simultaneously, can provide clock sources to digitize output from the microphone coupled to the cuff of the blood pressure measuring instrument.
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