# US 2019/0167154 A1 · Device, system and method for caloric intake detection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0167154 A1 - Document ID: US20190167154A1 - Status: Published application - Kind: A1 - Application number: 16/323,982 - Filed: 2017-08-14 - Published: 2019-06-06 - Earliest claimed: 2016-08-18 - Assignees: Koninklijke Philips N.V. - Applicants: Koninklijke Philips N.V. - Inventors: FRANCESCO SARTOR; GABRIELE PAPINI; ZIHAN WANG - Web page: https://patentgrep.com/patent/US20190167154A1 ## CPC - A61B 5/113: occurring during breathing - A61B 5/0806: {by whole-body plethysmography} - A61B 5/0816: {Measuring devices for examining respiratory frequency (measuring frequency of electric signals G01R23/00)} - A61B 5/11: Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb {(A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721)} - A61B 5/1118: {Determining activity level} - A61B 5/4866: {Evaluating metabolism (using breath test A61B5/083)} - A61B 5/6831: {Straps, bands or harnesses} - A61B 5/721: {using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured} - A61B 5/7267: {involving training the classification device} - A61B 5/1135: {by monitoring thoracic expansion} - A61B 5/6824: {Arm or wrist} - G16H 50/70: for mining of medical data, e.g. analysing previous cases of other patients - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA ## Abstract The present invention relates to a device, system and method for automatic and unobtrusive caloric intake detection. The device comprises a respiration input for obtaining a respiration signal indicating the subject's respiration, and an analysis unit for analyzing the obtained respiration signal in the frequency domain by determining one or more respiration signal features from the obtained respiration signal in the frequency domain related to changes in oxidation and by detecting changes of the one or more determined respiration signal features to detect periods of caloric intake by the subject. ## Claims ### Claim 1 Device for caloric intake detection due to digestion, said device comprising: a respiration input for obtaining a respiration signal indicating the subject's respiration, an analysis unit for analyzing the obtained respiration signal by determining one or more respiration signal features from the obtained respiration signal detecting one or more changes of the one or more determined respiration signal features over time, wherein said changes include changes of the group of changes including an increase in respiration frequency, an increase of the amplitude of the respiration signal, a decrease of the inter-breath interval, an increase of the amplitude of the dominant frequency in the frequency spectrum of the respiration signal, and a changed in the respiratory variability, and detecting a period as a periods of caloric intake due to digestion by the subject if one or more of said changes has been detecting during said period. ### Claim 2 (depends on 1) Device as claimed in claim 1, wherein said analysis unit is configured to detect a period as a period of caloric intake due to digestion by the subject if at least two of said changes have been detected during said period. ### Claim 3 (depends on 1) Device as claimed in claim 1, wherein said analysis unit is configured to use one or more feature thresholds for detecting changes of the one or more determined respiration signal features. ### Claim 4 (depends on 1) Device as claimed in claim 1, wherein said analysis unit is configured to select subsequent time windows, in particular overlapping time windows, of the obtained respiration signal for the analysis by the analysis unit and to detect changes of the one or more determined respiration signal features among selected subsequent time windows. ### Claim 5 (depends on 4) Device as claimed in claim 4, further comprising an activity input for obtaining activity data indicating a subject's physical activity, wherein said analysis unit is configured to select time windows for the analysis based on the activity data. ### Claim 6 (depends on 5) Device as claimed in claim 5, wherein said analysis unit is configured to select time windows in which the activity data indicate no activity or an activity related to caloric intake or an activity below a predetermined intensity. ### Claim 7 (depends on 5) Device as claimed in claim 5, wherein said analysis unit is configured to determine the duration of the time windows based on the intensity and duration of a detected activity. ### Claim 8 (depends on 1) Device as claimed in claim 1, wherein said analysis unit is configured to detect pre-prandial and post-prandial periods based on the detected changes of the one or more determined respiration signal features. ### Claim 9 (depends on 8) Device as claimed in claim 8, wherein said analysis unit is configured to determine the inter-breath interval length as one respiration signal feature and to detect a post-prandial period if the inter-breath interval length decreases. ### Claim 10 (depends on 8) Device as claimed in claim 8, wherein said analysis unit is configured to determine the dominant frequency as one respiration signal feature and to detect a post-prandial period if the dominant frequency increases. ### Claim 11 (depends on 1) System for caloric intake detection, said system comprising: a respiration sensor for detecting a subject's respiration and for generating a respiration signal indicating the subject's respiration, and a device as defined in claim 1 for caloric intake detection based on the generated respiration signal. ### Claim 12 (depends on 11) System as claimed in claim 11, wherein said respiration sensor comprises a wearable sensor, in particular a respiration belt, a wrist worn sensor, an ECG sensor, or a contact photoplethysmography sensor, or a remote sensor, in particular a remote photoplethysmography sensor or a camera. ### Claim 13 (depends on 11) System as claimed in claim 11, further comprising an activity sensor, in particular an accelerometer or a remote camera, for acquiring activity data indicating a subject's physical activity, wherein said device is configured to use the acquired activity data in detecting caloric intake of the subject. ### Claim 14 (depends on 1) Method for use by a computer, processor or device as claimed in claim 1 for automatic caloric intake detection due to digestion, said method comprising: obtaining a respiration signal indicating the subject's respiration, analyzing the obtained respiration signal by determining one or more respiration signal features from the obtained respiration signal detecting one or more changes of the one or more determined respiration signal features over time, wherein said changes include changes of the group of changes including an increase in respiration frequency, an increase of the amplitude of the respiration signal, a decrease of the inter-breath interval, an increase of the amplitude of the dominant frequency in the frequency spectrum of the respiration signal, and a change in the respiratory variability, and detecting a period as a period of caloric intake due to digestion by the subject if one or more of said changes has been detecting during said period. ### Claim 15 (depends on 14) Computer program comprising program code means for causing a computer to carry out the steps of the method as claimed in claim 14 when said computer program is carried out on the computer.