US 12,433,987 B2
Photodynamic therapy device
Shinpei Kajiwara, Hirakata (JP); and Fumito Kikuchi, Hirakata (JP)
Assigned to OTSUKA ELECTRONICS CO., LTD., Hirakata (JP)
Appl. No. 17/433,792
Filed by OTSUKA ELECTRONICS CO., LTD., Hirakata (JP)
PCT Filed Feb. 25, 2019, PCT No. PCT/JP2019/007128
§ 371(c)(1), (2) Date Aug. 25, 2021,
PCT Pub. No. WO2020/174547, PCT Pub. Date Sep. 3, 2020.
Prior Publication US 2022/0134126 A1, May 5, 2022
Int. Cl. A61M 1/36 (2006.01); A61N 5/06 (2006.01)
CPC A61M 1/3683 (2014.02) [A61N 5/062 (2013.01); A61M 2205/18 (2013.01); A61N 2005/0628 (2013.01); A61N 2005/0652 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A photodynamic therapy device, comprising:
a light emitting unit including a plurality of light sources each belonging to any one of a plurality of groups;
a photodetector configured to output an electrical signal corresponding to an amount of light received from the plurality of light sources;
a light emission control unit configured to sequentially cause the plurality of light sources to emit light for each group; and
a computing unit configured to calculate, based on a distance coefficient related to a distance between the photodetector and one or more of the plurality of light sources belonging to the each group, and on a value of the electrical signal output by the photodetector in accordance with light emitted from the one or more of the plurality of light sources belonging to the each group, a group light amount value related to a light amount of the plurality of light sources belonging to the each group,
wherein a ratio of a first group light amount value of one of the groups to a second group light amount value of another one of the groups is set as the distance coefficient of said another one of the groups, and
wherein the computing unit is further configured to control the plurality of light sources to emit light in response to the group light amount value satisfying a reference condition, to thereby perform photodynamic therapy on a treatment target.