| abstract |
(57) [Summary] [PROBLEMS] To provide a stethoscope that is simple, always portable, and capable of accurate diagnosis. SOLUTION: Irradiation / reception fiber 11 as a probe part is irradiated noninvasively with a near infrared ray to an affected part, for example, a change in cerebral circulation blood flow is searched, and the change amount is discriminated as a pulse modulation of a sound to change a brain function. Examining the For example, λ = 760,800,830 from the semiconductor laser light source 22 The affected part is irradiated with three wavelengths of nm, the reflected data from the affected part is processed by the control device 21, the change is pitched, and the receiver 32 diagnoses the frequency change of the sound with a constant volume by the doctor's ear. |