Sensor and biological signal measuring system

A sheet structure comprising:

• a light emitter configured to emit light toward a living tissue of a subject;
• a light receiver configured to receive reflected light or transmitted light from the living tissue of the subject;
• a first light transmitting member being a single-piece member made of a light transmitting material, the first light transmitting member having one end configured as a contact surface contacting the light emitter and another end forming a contact surface to contact the subject;
• a second light transmitting member being a single-piece member made of a light transmitting material, the second light transmitting member having one end configured as a contact surface contacting the light receiver and another end forming the contact surface to contact the subject;
• and
• a thin-film sheet configured to block light between the light emitter and the light receiver, the light emitter and the light receiver being provided on the thin-film sheet.

A biological signal measuring system comprising:

• a sensor;
• and
• a biological signal measuring apparatus configured to calculate a blood refill time of a subject,
• wherein the sensor comprises:
• a pressure applying portion configured to apply pressure on a living tissue of the subject;
• a light emitter configured to emit light toward the living tissue of the subject;
• a light receiver configured to receive reflected light or transmitted light from the living tissue of the subject;
• a first light transmitting member made of a light transmitting material, the first light transmitting member having one end configured as a contact surface contacting the light emitter and another end forming a contact surface to contact the subject;
• a second light transmitting member made of a light transmitting material, the second light transmitting member having one end configured as a contact surface contacting the light receiver and another end forming the contact surface to contact the subject;
• and
• a light blocking member configured to block light between the light emitter and the light receiver,
• wherein the biological signal measuring apparatus is configured to calculate the blood refill time based on an amount of light received by the sensor.

A biological signal measuring system comprising:

• a sensor configured as a cuff that is wrapped around a subject to be held onto the subject and configured to acquire a pressure change inside the cuff;
• and
• a biological signal measuring apparatus configured to calculate a blood refill time of the subject and a blood pressure of the subject,
• wherein the sensor comprises:
• a pressure applying portion comprising a bag configured to apply pressure on a living tissue of the subject when the bag is inflated;
• a light emitter configured to emit light toward the living tissue of the subject;
• a light receiver configured to receive reflected light or transmitted light from the living tissue of the subject;
• a first light transmitting member made of a light transmitting material, the first light transmitting member having one end configured as a contact surface contacting the light emitter and another end forming a contact surface to contact the subject;
• a second light transmitting member made of a light transmitting material, the second light transmitting member having one end configured as a contact surface contacting the light receiver and another end forming the contact surface to contact the subject;
• and
• a light blocking member configured to block light between the light emitter and the light receiver,
• wherein biological signal measuring apparatus is configured to calculate the blood refill time of the subject based on an amount of light received by the sensor, and to calculate the blood pressure of the subject based on the pressure change inside the cuff acquired by the sensor.

A sensor configured to measure a blood refill time of a living tissue of a subject, the sensor comprising:

• a pressure applying portion having a bag configured to apply pressure on the living tissue of the subject;
• a light emitter configured to emit light toward the living tissue of the subject;
• a light receiver configured to receive reflected light or transmitted light from the living tissue of the subject;
• a light blocking member arranged between the light emitter and the light receiver;
• a light transmitting material forming a contact surface to contact the subject;
• and
• an elastic film provided on a surface opposite to the contact surface to cover the bag,
• wherein the light emitter and the light receiver are attached to the living tissue of the subject via the light transmitting material,
• wherein the light blocking member has a second light transmission rate that is lower than a first light transmission rate of the light transmitting material, and
• wherein an elastic modulus of the elastic film is greater than an elastic modulus of the bag.