| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent effect of noise from a power source in a continuous hemomanometer for measuring a blood pressure of a subject by vibrating a blood vessel to analyze vibration transmitted through the blood vessel. SOLUTION: This apparatus is provided with a vibrator 102 which is mounted on a subject 101 to vibrate a blood vessel by a signal from an oscillator 103, aa vibration sensor 104 to detect vibration propagated through the blood vessel and a processor 107 which detects the phase of a signal from the vibration sensor to calculate changes in the phase. A control is performed so that the oscillation frequency of the oscillator 103 gives a frequency other than an avoiding frequency with respect to a frequency, an integer multiple of a power source frequency, from a frequency minus the band width of a phase detection filter to that plus the band width of the phase detection filter in a processor 107.</p> |
