MEASUREMENT OF PHYSIOLOGICAL SIGNALS

摘要

A system includes an optical sensor and a signal processing module The optical sensor is configured to be positioned on an area of skin of a patient The optical sensor includes a light source for illuminating a capillary bed in the area of skin and a photodetector The photodetector is configured to receive an optical signal from the capillary bed resulting from the illumination and to convert the optical signal into an electrical signal, the optical signal characterizing a fluctuation in a level of blood in the capillary bed The signal processing module is configured to process the electric signal using a nonstationary frequency estimation method to obtain a processed signal related to at least one of a heart rate and a respiration rate of the patient Another aspect relates to obtaining a quantity related to the blood pressure of the patient