Detection of finger-tip blood vessel pulsation using CoSiB thin amorphous wire CMOS-IC SI sensor

Finger-tip blood vessel pulsation (FTP) with a capillary blood vessel pressure of few milligrams was accurately detected using a CoSiB amorphous wire stress-impedance (SI) sensor which shows a giant strain-gauge factor of about 4000. The incisura in a FTP waveform was clearly observed for young aged subjects, while the incisura slightly appeared in the FTP waveform for older subjects after sports. The blood vessel pulsation speed was measured between the elbow and the wrist V/sub ew/, and also between the wrist and the finger-tip V/sub wf/, and the authors found that V/sub ew/ was faster than V/sub wf/. It is concluded that the FTP sensing will be useful for diagnosis of the circulatory system and the health state.