Method and apparatus for calculating blood pressure with signal transformation
First Claim
1. A method for calculating blood pressure, comprising:
- acquiring a plurality of frequency domain pulse wave (PW) maximum amplitude values and associated pressure measurements from respective frequency domain representations of time domain PW pressure signals obtained at different respective measurement pressures, wherein acquiring a PW maximum amplitude and associated pressure measurement comprises;
setting a pressure measurement device to a determined measurement pressure,receiving a pressure signal and a set of PW pressure signals from the pressure measurement device, wherein the set of PW pressure signals are received over a predetermined time period,constructing a PW time sequence comprising the set of PW pressure signals,calculating a frequency domain representation of the PW time sequence, andidentifying a PW maximum amplitude value and PW frequency value in the frequency domain representation of the PW time sequence; and
calculating a blood pressure value using the plurality of frequency domain PW maximum amplitude values and associated pressure values.
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Abstract
A method and an apparatus for calculating blood pressure with signal transformation are provided, wherein said apparatus comprises: a pressure sensor, a pressure and pulse wave amplification circuit, an A/D converter, a microprocessor, a control circuit, an air pump and a valve component connected with the cuff gas circuit, a signal processing module and a ratio analysis module; and the method includes the steps of carrying out signal transformation of a time sequence of a sampled PW digital signal, calculating a maximum amplitude value and a corresponding frequency value based on the transformed signal, taking the maximum amplitude value as a amplitude value under the present pressure, carrying out continuously signal transformation of the time sequences of the PW digital signals at different pressure in order to constitute a PW amplitude-pressure curve and obtain an average pressure and a corresponding pulse rate from the PW amplitude-pressure curve, and finally calculating the systolic pressure and diastolic pressure with ratio method. With the method and apparatus according to the present invention, the measurement error can be reduced in case of the shiver, muscular fibrillation and the like of the human body being examined, and the measurement accuracy of blood pressure can be improved.
18 Citations
21 Claims
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1. A method for calculating blood pressure, comprising:
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acquiring a plurality of frequency domain pulse wave (PW) maximum amplitude values and associated pressure measurements from respective frequency domain representations of time domain PW pressure signals obtained at different respective measurement pressures, wherein acquiring a PW maximum amplitude and associated pressure measurement comprises; setting a pressure measurement device to a determined measurement pressure, receiving a pressure signal and a set of PW pressure signals from the pressure measurement device, wherein the set of PW pressure signals are received over a predetermined time period, constructing a PW time sequence comprising the set of PW pressure signals, calculating a frequency domain representation of the PW time sequence, and identifying a PW maximum amplitude value and PW frequency value in the frequency domain representation of the PW time sequence; and calculating a blood pressure value using the plurality of frequency domain PW maximum amplitude values and associated pressure values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for calculating a blood pressure, comprising:
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a pressure measurement device configured to acquire a plurality of sets of pulse wave (PW) pressure signals and associated pressure measurements, wherein each set of PW pressure signals and associated pressure measurements are acquired at different measurement pressures and for a predetermined time period; a signal processing module configured to calculate a PW time sequence for each of the plurality of sets of PW pressure signals, to transform each of the PW time sequences into a respective frequency domain representation, and to identify within each frequency domain representation a frequency domain PW maximum amplitude value; and a ratio analysis module configured to calculate a blood pressure value using the plurality of frequency domain PW maximum amplitude values and associated pressure values. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification