Patent ID: 11864885
Assignee: NATIONAL UNIVERSITY CORPORATION CHIBA UNIVERSITY
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A biological state monitoring system for monitoring a biological state of a subject on a bed over a predetermined monitoring period, the system comprising:
a plurality of load detectors each configured to detect a load value of the subject on the bed; and
a controller configured to:
successively obtain and output estimated values of a respiratory rate of the subject, based on a temporal variation of the load value detected over time by at least one of the plurality of load detectors;
obtain a center of gravity position of the subject based on the load value detected by each of the plurality of load detectors;
obtain a respiratory waveform of the subject based on a temporal variation of the center of gravity position of the subject; and
determine whether or not the subject has a body motion based on a comparison between a threshold value and a standard deviation of the temporal variation of the load value of the subject detected by at least one of the plurality of load detectors,

wherein the controller is configured to compensate the standard deviation to be used in the comparison by dividing the standard deviation by an amplitude of the respiratory waveform, and
wherein the controller is configured to output, from a body motion occurrence time until passing of a predetermined period after a body motion ending point, a last estimated value of the respiratory rate of the subject which is the latest among the estimated values of the respiratory rate of the subject obtained prior to the body motion occurrence time, the body motion occurrence time being a time point at which the controller determines that the subject has the body motion, the body motion ending point being a time point at which the controller determines that the subject has no body motion for the first time after the body motion occurrence time.