US 12,226,204 B2
Body motion determination system and biological state monitoring system
Shigemi Masuda, Fukuroi (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Appl. No. 16/636,069
Filed by Minebea Mitsumi Inc., Nagano (JP)
PCT Filed Jul. 27, 2018, PCT No. PCT/JP2018/028208
§ 371(c)(1), (2) Date Feb. 3, 2020,
PCT Pub. No. WO2019/026782, PCT Pub. Date Feb. 7, 2019.
Claims priority of application No. 2017-151568 (JP), filed on Aug. 4, 2017.
Prior Publication US 2021/0153777 A1, May 27, 2021
Int. Cl. A61B 5/113 (2006.01); A61B 5/00 (2006.01); A61B 5/08 (2006.01); A61B 5/11 (2006.01)
CPC A61B 5/113 (2013.01) [A61B 5/0816 (2013.01); A61B 5/1115 (2013.01); A61B 5/4809 (2013.01); A61B 5/6892 (2013.01); A61B 5/7221 (2013.01); A61B 5/7278 (2013.01); A61B 5/7282 (2013.01); A61B 2560/0475 (2013.01); A61B 2562/0252 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A body motion determination system for determining whether a body motion of a subject on a bed presents or not, the system comprising:
a load detector configured to detect a load of the subject on the bed;
a display; and
a controller configured to control the body motion determination system to:
calculate non-negative-valued averages of a detection value of the load detector continuously in a period;
set a threshold value to be used in determining whether the body motion of the subject presents or not, based on a minimum value of the non-negative-valued averages calculated in the period;
calculate a standard deviation of the detection value of the load detector;
determine whether the body motion of the subject presents or not based on a comparison between the calculated standard deviation and the threshold value; and
cause the display to display a result of the determining of whether the body motion of the subject presents or not to a user of the system, or cause an auditory device to perform a notification based on the result of the determining of whether the body motion of the subject presents or not,
wherein the controller is further configured:
to newly set the threshold value when the controller determines that the body motion of the subject presents, based on the minimum value of the non-negative-valued averages calculated in the period after a determination that the body motion of the subject presents; and
then continue to use the newly set threshold value until the controller determines that the body motion of the subject presents next and another threshold value is determined.