In various embodiments, the present disclosure provides devices and systems for detecting the blood pressure of a user. In one embodiment, an optoelectronic device includes an array of avalanche photodiodes operating in Geiger mode. A tunable optical filter is optically coupled to the array and receives a light beam reflected from a vascularized tissue of the user, in response to the vascularized tissue being illuminated by an optical source.

This document describes assessing cardiovascular function using an optical sensor, such as through sensing relevant hemodynamics understood by pulse transit times, blood pressures, pulse-wave velocities, and, in more breadth, ballistocardiograms and pressure-volume loops. The techniques disclosed in this document use various optical sensors to sense hemodynamics, such as skin color and skin and other organ displacement. These optical sensors require little if any risk to the patient and are simple and easy for the patient to use.

A sensor that detects a heart rate and/or a blood oxygen content includes a radiation source and a photodetector, wherein the radiation source includes a light-emitting diode array, the light-emitting diode array includes a plurality of emission regions, the emission regions each include a first light-emitting diode and a second light-emitting diode, the first light-emitting diode includes a first wavelength, the second light-emitting diode includes a second wavelength, and a distance between the first light-emitting diode and the second light-emitting diode within the emission regions is 100 micrometers or less.

Examples of monolithic integrated emitter-detector array in a flexible substrate for biometric sensing and associated devices and methods are disclosed. One disclosed example device includes a flexible substrate; a first array of emitters embedded in the flexible substrate, the first array of emitters configured to emit first electromagnetic (EM) signals; a first array of detectors embedded in the flexible substrate, the first array of detectors configured to detect reflections of the first EM signals; a first scanning circuit coupled to the first array of emitters, the first scanning circuit configured to selectively activate individual emitters of the first array of emitters; and a first sensing circuit coupled to individual detectors of the first array of detectors, the first sensing circuit configured to receive a detection signal from at least one of the detectors of the first array of detectors.

A pulse oximetry system including a housing operable to interface with a digit of a user, a light emitter, and first and second light receivers. The light emitter is positioned adjacent to an inside surface of the housing and operable to emit a light, the light configured to transmit through tissue of the digit of the user, wherein some of the light is scattered by or reflected off the tissue of the digit of the user. The first light receiver is positioned adjacent to an inside surface of the housing opposite from the previously mentioned inside surface and operable to detect light that is transmitted through the tissue of the digit of the user. The second light receiver adjacent to an inside surface of the housing and operable to detect light that is scattered by or reflected off the tissue of the digit of the user.

An intraoral monitoring device includes a plurality of sensors integrated on a flexible substrate. The plurality of sensors includes first and second photoplethysmography (PPG) sensors. The first PPG sensor is coupled along an anterior portion of the flexible substrate and adapted to be located intraorally along a first anatomical location defined along a mid-line of a maxilla, facing the labial mucosa, directly at a septal branch of a superior labial artery in a front lip to consistently provide a plurality of first PPG signal, relating to a plurality of cardiorespiratory parameters. Further, the second PPG sensor is coupled to a rear portion of the flexible substrate, adapted to be located intraorally along a second anatomical location defined along the interior part of an oral cavity facing outward toward the labial mucosa to consistently provide a plurality of second PPG signals, relating to a plurality of muscular parameters.

A breathing sequence may define a suggested breathing pattern. Based on signal data collected by a user device, an initial breathing pattern that includes a cyclic pattern may be estimated. A first period of the breathing sequence may be initiated by generating a breathing sequence element based on a synchronization of the cyclic pattern with the breathing sequence. The breathing sequence element may fluctuate during a second period of the breathing sequence in accordance with a breathing profile associated with the suggested breathing pattern.

There is provided a method for use in determining whether a subject is allergic to a substance. The method comprises: receiving a first set of spatially distributed light intensity values covering a skin region of the subject including a location at which the substance has been applied; wherein the light intensity values in the first set are intensities of visible light; receiving a second set of spatially distributed light intensity values covering the skin region, wherein the light intensity values in the second set are intensities of infrared, IR, light; generating a first spatial distribution of photoplethysmogram, PPG, pulse amplitudes based on the first set of light intensity values; generating a second spatial distribution of PPG pulse amplitudes based on the second set of light intensity values; comparing the first spatial distribution to the second spatial distribution, and to the location at which the substance has been applied; and outputting an indication of whether the subject is experiencing an allergic reaction to the substance based on the comparing.

A wearable member may include a plurality of energy transmitters that are arranged on a surface of the wearable member, each of the energy transmitters being configured to project energy into tissue of a user. A wearable member may include a plurality of energy receivers each of which is configured to generate a signal based on a received portion of the energy that is projected by one or more of the energy transmitters and reflected by the tissue of the user, wherein at least one of the energy transmitters and the energy receivers are multi-dimensionally arranged on the wearable member such that energy reflected by the tissue of the user at locations that are multi-dimensionally different is incident on the plurality of energy receivers. The processor may be configured to calculate a biological metric based on signals generated by at least part of the plurality of energy receivers.

According to the present invention, in a configuration in which a biological signal is received from an attachment-type device including one or more light emitting means and two or more light receiving means, information on a living body is acquired with high accuracy. A modulation unit (110) dims the one or more light emitting means with a specific frequency, a receiving unit (120) receives a biological signal based on the light received from a living body through the two or more light receiving means, and an adjusting unit (130) adjusts the intensity of the biological signal acquired from each light receiving means on the basis of the component of a specific frequency of the biological signal.