Simultaneous detection of blood vessel pulsation waves at temple and finger tip using CoSiB amorphous wire CMOS IC Si sensor

Summary form only given. Detection of blood vessel pulsation (BVP) waves are important for estimation of circulatory system functions and diagnosis for circulatory organs. We have developed a highly sensitive stress sensor having a 4000 gauge factor named SI sensor using a 20 /spl mu/m diameter CoSiB amorphous wire and CMOS IC multivibrator utilizing the stress-impedance effect and applied to detect the finger-tip BVP waves in which effects of smoking and drinking are clearly detected. In this paper, a simultaneous detection of BVP waves at the temple and the finger-tip of a healthy subject using a pair of SI sensors for investigation of their relation on sleeping and awaking in which the temple BVP precedes except during deep sleep.