Patent ID: 8229531

Claim:
An optical bioinstrumentation device for measuring hemodynamic changes in a head of a subject, comprising: a plural number of optical fibers configured to irradiate light onto the head of the subject; a plural number of optical fibers configured to detect light which is transmitted inside the head; a fixing member for holding tips of the plural number of optical fibers configured to irradiate and tips of the plural number of optical fibers configured to detect; and a plural number of holding members for fixing a first part of the optical fibers, other than the tips of the plural number of optical fibers configured to irradiate, and a first part of the optical fibers other than the tips of the plural number of optical fibers configured to detect, on the fixing member respectively to prevent movement of the optical fibers relative to the fixing member; wherein the fixing member is configured to be fixed on the head of the subject, and the holding members for fixing optical fibers are installed for each of the plural number of optical fibers configured to irradiate and the plural number of optical fibers configured to detect; and wherein the holding members for fixing optical fibers further comprises a second holding member for fixing optical fibers to fix a second part of the optical fibers other than the tip of the plural number of optical fibers configured to irradiate and a second part of the optical fibers other than the tip of the plural number of optical fibers configured to detect on a wearing member which the subject wears to prevent movement of the optical fibers relative to the wearing member, wherein each of the holding members has a hook or a protrusion, which entangles the part of the optical fibers other than the tip of the plural number of optical fibers configured to irradiate and the part of the optical fibers other than the tip of the plural number of the optical fibers configured to detect.