US 12,484,807 B2
Wearable sensor, perspiration analysis device and method
Yuki Hashimoto, Tokyo (JP); Takako Ishihara, Tokyo (JP); and Kei Kuwabara, Tokyo (JP)
Assigned to NTT, INC., Tokyo (JP)
Appl. No. 17/635,888
Filed by NTT, Inc., Tokyo (JP)
PCT Filed Aug. 28, 2019, PCT No. PCT/JP2019/033727
§ 371(c)(1), (2) Date Feb. 16, 2022,
PCT Pub. No. WO2021/038758, PCT Pub. Date Mar. 4, 2021.
Prior Publication US 2022/0287599 A1, Sep. 15, 2022
Int. Cl. A61B 5/145 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/14517 (2013.01) [A61B 5/486 (2013.01); A61B 5/6801 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A perspiration analysis device, comprising:
a wearable sensor comprising:
a base member that includes a through hole serving as a flow path of liquid and a first recess connected to a first end portion of the through hole;
a water absorbing structure disposed on a first surface of the base member to come into contact with the liquid flowing into the first recess from a first opening of the through hole on the first end portion;
a light emitting element configured to radiate light toward the liquid flowing into the first recess from the first opening of the through hole,
wherein a second end portion of the through hole is disposed on a side of the base member facing a skin of a wearer when the base member is attached to a body of the wearer;
and a light receiving element configured to receive light emitted from the light emitting element;
and wherein the received light is one of (1) transmitted through the liquid, or (2) reflected by the liquid;
and a perspiration amount calculation device configured to calculate an amount of perspiration of the wearer of the wearable sensor based on characteristics of the light received by the light receiving element,
wherein in a case in which the light receiving element receives the light transmitted through the liquid, the perspiration amount calculation device is configured to set, as the amount of perspiration, a value obtained by multiplying a presumed volume of a droplet of the liquid flowing from the through hole into the first recess by a number of times an amount of received light of the light receiving element is equal to or less than a threshold or the number of times the amount of received light is a minimum value,
and in a case in which the light receiving element receives the light reflected by the liquid, the perspiration amount calculation device, as the amount of perspiration, a value obtained by multiplying the presumed volume of the droplet of the liquid flowing from the through hole into the first recess by the number of times the amount of received light of the light receiving element is equal to or greater than the threshold or the number of times the amount of received light is a maximum value.