Patent ID: 6802815
Filing Date: 2004-10-12
Classification: A61B

Abstract:
A noninvasive continuous blood pressure measuring apparatus comprising:oscillating means for generating an oscillation signal of which frequency is controlled; an exciter responsive to said oscillation signal for inducing an exciter waveform in an artery and blood in said artery of a living body; a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and outputting detection signal; calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body; frequency determining means responsive to said sensor for controlling said oscillating means to successively control said frequency at different frequencies, determining one of said different frequencies in accordance with said detection signal outputted at different frequencies, and then, controlling said oscillating means to continuously generating said oscillation signal at said one of said different frequencies; calculating means responsive to said frequency determining means for receiving absolute values from said calibration hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal at said one of said different frequencies and said absolute values; and displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means.