Patent ID: 11918373
Assignee: RESMED PTY LTD
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A method for a medical screening device for estimating a total sleep time of a patient during a monitoring session the medical screening device comprising a plurality of sensors including an actigraph, the medical screening device being configured to be mounted, when in use, on the patient's body during sleep, the method performed by one or more processors of the screening device and/or in communication with the screening device and comprising:
receiving, by the one or more processors, an actigraphy signal generated by the actigraph during the monitoring session;
determining, by the one or more processors, an activity count for each epoch of a plurality of overlapping epochs of the monitoring session, from the actigraphy signal, wherein the plurality of overlapping epochs includes at least one overlapping epoch that overlaps a previous epoch and a succeeding epoch;
determining, by the one or more processors, a sleep/wake state of the patient during each epoch of the plurality of overlapping epochs of the monitoring session by processing the actigraphy signal; and
computing an estimate, by the one or more processors, of the total sleep time from the determined sleep/wake state of the patient during each epoch of the monitoring session, wherein the determining, by the one or more processors, the sleep/wake state of the patient during each epoch comprises:
determining a result of comparing, by the one or more processors, a ratio of the activity count of two overlapping epochs, to a first activity threshold, the ratio of the activity count of two overlapping epochs being a ratio of the activity count for an overlapping epoch to the activity count for a previous epoch that immediately precedes and overlaps with the overlapping epoch, and
determining, by the one or more processors, the sleep/wake state of the patient during the overlapping epoch based at least in part on the result of the comparing.