Patent ID: 8608663
Filing Date: 2013-12-17
Classification: A61B

Abstract:
1. A pulse wave period measuring apparatus comprising: a pulse wave detecting unit configured to detect a pulse wave of a subject; a value detecting unit configured to detect a maximum value and a minimum value in a predetermined period of the pulse wave; a reference value calculating unit configured to calculate one or more reference values between the maximum value and the minimum value in the predetermined period, based on one or more internally dividing ratios common to plural predetermined periods of the pulse wave; a time calculating unit configured to calculate two or more times in the predetermined period, the time calculating unit calculating the two or more times at which the pulse wave intersects with the one or more reference values; a pulse wave period calculating unit configured to calculate a time period between each calculated time in the predetermined period and a corresponding calculated time in a last period before the predetermined period, as a pulse wave period of the pulse wave; a variation calculating unit configured to calculate a variation of pulse wave periods, for two or more pulse wave periods calculated between the predetermined period and the last period before the predetermined period; and a stability calculating unit configured to calculate, based on the variation of the pulse wave periods, the stability of measuring the pulse wave periods.