DEVICE, SYSTEM AND METHOD FOR DETERMINING VITAL SIGNS OF A SUBJECT

摘要

The present invention relates to a device, system and method for determining vital signs of a subject. To balance accuracy and reliability with unobtrusiveness, the device comprises an interface (30) for receiving input signals from a detection unit (18) that is configured for contactless detection of radiation reflected from a subject (14) in response to illumination by an illumination source (22), a processing unit (32) for deriving photoplethysmography, PPG, signals from the received input signals, an analysis unit (34) for deriving a desired vital sign from the PPG signals, and a control unit (36) for controlling one or more parameters of the illumination source (22), the detection unit (18) and/or the analysis unit (34) in dependence on the physical state of the subject, the quality of the input signals or the derived vital sign and/or the value of the vital sign.

主权项

1. Device for determining vital signs of a subject comprising:
an interface for receiving input signals from a detection unit that is configured for contactless detection of radiation reflected from a subject in response to illumination by an illumination source, a processing unit for deriving photoplethysmography, PPG, signals from the received input signals, an analysis unit for deriving a desired vital sign from the PPG signals, a control unit for switching the illumination source between at least a safety mode and a comfort mode and for controlling one or more parameters of the illumination source according to the respective mode, in dependence on the health state of the subject,wherein said control unit is configured to switch the illumination source into the safety mode, in which one or more derived vital signs can be derived with increased accuracy and reliability compared to the comfort mode, in case of a decreasing health state of the subject and to switch the illumination source into the comfort mode, in which the illumination has increased unobtrusiveness compared to the safety mode, in case of a stable or increasing health state of the subject.