Development of noninvasive measurement of peripheral circulation and its application for health care

最近，使用光电传感器和发光二极管(LED)非侵入性地测量动脉血氧饱和度、手指动脉压和指动脉弹性已经成为可能。光电传感器也被用来测量指动脉的机械特性和外周组织的血流量等指标。有各种外周循环指数是通过激光和LED的近红外光获得的。虽然这些指标可以无创或微创地通过施加短期压力来获得，但当施加袖带压力时，测量的连续性就会丧失。在这种方法中，仅用1个波长的光进行测量是不够的。如果使用两个波长，绝对值的测定可以提高。我们还进行了使用光传感器评估外周循环功能的初步检查。建立了指动脉组织血流量测量装置、测量原理、指动脉弹性和非线性特性的评价及组织血流量测量。

Recently, it has become possible to noninvasively measure the oxygen saturation level of arterial blood, finger arterial pressure, and the elasticity of digital arteries using photosensors and light-emitting diodes(LED). Photosensors have also been used to measure the mechanical properties of digital arteries and indices such as the blood volume in peripheral tissue.There are various peripheral circulatory indices that was obtained using a laser beam and near infrared light from LED. Though these indices can be obtained noninvasively or minimally invasively by application of short-term pressure, the continuity of measurement is lost when cuff pressure is applied. Measurement is insufficient using light of only 1 wavelength in this method. Determination of an absolute value can be improved if 2 wavelengths was used.We has also carried out preliminary examination of the assessment of peripheral circulatory function using photosensors. The apparatus, the principle involved in measurement, the assessment of elasticity and nonlinear characteristics of the digital arteries, the measurement of tissue blood volume was establishied.