Patent ID: 8795184

Claim:
A wireless plethysmogram sensor unit capable of obtaining a plethysmogram from a living tissue of a measuring object and of transmitting the obtained plethysmogram to a processing unit outside the wireless plethysmogram sensor unit, the processing unit being capable of receiving plethysmogram of a plurality of measuring objects obtained by a plurality of wireless plethsymogram sensor units, respectively, comprising: a light source provided inside the wireless plethysmogram sensor unit and arranged to emit measuring light into the living tissue; a light receiving element provided inside the wireless plethysmogram sensor unit and arranged to receive light emerging from the living tissue which is the measuring light in origin and accompanied by pulsation caused by absorption by arteries in the living tissue; a memory provided inside the wireless plethysmogram sensor unit and arranged to store a plethysmogram obtained in accordance with the light received by the light receiving element; a short range wireless communicator provided inside the wireless plethysmogram sensor unit and arranged to transmit the plethysmogram stored in the memory to the processing unit; a power source provided inside the wireless plethysmogram sensor unit to power elements provided inside the wireless plethysmogram sensor unit; and a controller provided inside the wireless plethysmogram sensor unit and arranged to control the elements provided inside the wireless plethysmogram sensor unit, wherein the short range wireless communicator is arranged to transmit information for identifying the plethysmogram sensor to the processing unit, and wherein the short range wireless communicator is arranged to transmit information for identifying the measuring object to the processing unit, the information for identifying the plethysmogram sensor unit and the information for identifying the measuring object allowing the processing unit to distinguish a specific combination of the wireless plethysmogram sensor unit and the measuring object from other combinations among the plurality of wireless plerhismogram sensor units and the plurality of the measuring objects.