Pulse wave analysis apparatus and pulse wave analysis program product for automatically extracting characteristic points of pulse wave
First Claim
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1. A pulse wave analysis apparatus comprising:
- a pressure sensor for detecting a pulse wave;
a digital conversion unit for converting a pressure signal from said pressure sensor into a digital signal;
a fourth derivative filter having an adjustable frequency characteristic for obtaining a fourth derivative wave of an original waveform based on said digital signal generated by the conversion by said digital conversion unit;
a local extremum calculation unit for calculating local extrema of said fourth derivative wave in a section of the pulse wave corresponding to one beat; and
a characteristic point calculation unit for calculating a characteristic point of said pulse wave, whereinsaid characteristic point calculation unit includes;
a first calculation unit for calculating an early systolic component based on said local extrema of said fourth derivative wave; and
a second calculation unit for calculating a late systolic component based on said local extrema of said fourth derivative wave.
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Abstract
A pressure sensor for detecting a pulse wave, a digital conversion unit for converting a pressure signal from the pressure sensor into a digital signal, and a fourth derivative filter having an adjustable frequency characteristic for obtaining a fourth derivative wave of an original waveform based on the digital signal generated by the conversion by the digital conversion unit are provided. Local extrema of the fourth derivative wave in a section of the pulse wave corresponding to one beat are calculated. Based on the calculated local extrema, an early systolic component and a late systolic component are calculated.
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Citations
22 Claims
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1. A pulse wave analysis apparatus comprising:
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a pressure sensor for detecting a pulse wave; a digital conversion unit for converting a pressure signal from said pressure sensor into a digital signal; a fourth derivative filter having an adjustable frequency characteristic for obtaining a fourth derivative wave of an original waveform based on said digital signal generated by the conversion by said digital conversion unit; a local extremum calculation unit for calculating local extrema of said fourth derivative wave in a section of the pulse wave corresponding to one beat; and a characteristic point calculation unit for calculating a characteristic point of said pulse wave, wherein said characteristic point calculation unit includes; a first calculation unit for calculating an early systolic component based on said local extrema of said fourth derivative wave; and a second calculation unit for calculating a late systolic component based on said local extrema of said fourth derivative wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pulse wave analysis program product on a computer readable medium for a computer to execute an analysis program of a pulse wave that is a composite wave of a first waveform and a second waveform,
said analysis program comprising: -
an obtaining step for obtaining a fourth derivative wave from the pulse wave corresponding to one beat; an extracting step for extracting local extrema of said obtained fourth derivative wave; a first calculation step for calculating said first waveform based on said extracted local extrema; and a second calculation step for calculating said second waveform based on said extracted local extrema. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification