Pulse photometry probe

A pulse photometry probe comprising:

• a light emitter having a first face from which light is emitted toward a living body;
• a light receiver having a second face which receives the light from the living body;
• a surface sheet which faces the first face of the light emitter and the second face of the light receiver;
• a cover sheet in which at least one slit is formed, the light emitter and the light receiver which are disposed between the surface sheet and the cover sheet;
• and
• a lead wire which includes:
• a first lead wire connected to one of the light emitter and the light receiver;
• a second lead wire connected to the other one of the light emitter and the light receiver;
• and
• a basal portion at which the first lead wire and the second lead wire are bundled, wherein the second lead wire includes at least one slack portion between the basal portion and the other one of the light emitter and the light receiver,
• wherein the pulse photometry probe is configured to circumferentially wrap around an axis extending from a proximal end to a distal end of an appendage and,
• wherein the at least one slit is configured to reduce aperture formation and thereby reduce interference from ambient light when the pulse photometry probe is wrapped around the axis extending from the proximal end to the distal end of the appendage.