Probe unit

A probe unit used to measure hemoglobin dynamics inside a subject, the probe unit comprising:

• a main body having flexibility;
• a first probe attached to the main body and having a first face from which a first light emitting portion configured to irradiate the subject with light is exposed, the first light emitting portion having a first emission axis;
• a second probe attached to the main body to face the first probe and having a second face from which a first light incidence portion configured to detect light propagated inside the subject is exposed, the first light incidence portion having a first incidence axis;
• a first light shielding member having light shielding properties, containing an elastic material, and attached to the first face to surround the first emission axis of the first light emitting portion;
• and
• a second light shielding member having light shielding properties, containing an elastic material, and attached to the second face to surround the first incidence axis of the first light incidence portion,
• wherein:
• the first face of the first probe further exposes a second light incidence portion configured to detect light propagated inside the subject, the second light incidence portion having a second incidence axis;
• the second face of the second probe further exposes a second light emitting portion configured to irradiate the subject with light, the second light emitting portion having a second emission axis;
• the first light shielding member is attached to the first face to surround the first emission axis of the first light emitting portion and the second incidence axis of the second light incidence portion;
• and
• the second light shielding member is attached to the second face to surround the first incidence axis of the first light incidence portion and the second emission axis of the second light emitting portion.