A photoplethysmography (PPG) device includes an equipment module which includes a photodetector and first and second light emitting diodes (LED's) adapted to emit light of first and second wavelengths, respectively. The PPG device also includes a mask covering the patient facing extremity of the equipment module so that when the device is applied to a patient the mask is situated between the patient and the patient facing extremity. A processor is adapted to control drive current and/or operating time of the second LED to achieve an elevated localized body tissue temperature of a patient to which the PPG device is applied.

Various examples are described for detecting heart rate and respiratory rate by using measurements of light applied to skin through an article. For example, a sensor application obtains a set of measurements of light. The application compensates for a contribution of the article based on one or more known optical properties of the article. The sensor application further determines, from the set of measurements of light, a periodic change in amplitude. The sensor application identifies the periodic change in amplitude as a heart rate having an identical periodicity. The sensor application identifies a respiratory rate as equal to the rate of change of the heart rate.

Each accessory device in a set of accessory devices may establish a respective communication link between the accessory device and an ear-wearable device. A particular accessory device in the set of accessory devices may receive data via the communication link between the particular accessory device and the ear-wearable device. The data comprise information generated based on sensor signals from sensors that monitor a user of the ear-wearable device. The accessory devices perform a health monitoring activity based on the data.

The present application describes a PHHM of the type described in WO 2013/002165, WO 2014/125431 and International Patent Application No. PCT/EP2015/079888 with improved aspects to find indicators of health, and other improvements that facilitate its construction and calibration.

Embodiments of the present disclosure relate to a system and method for determining a risk, onset, or presence of hypovolemia based on one or more features of a plethysmographic waveform during a patient breathing cycle. For example, a hypovolemic patient may exhibit characteristic changes in pulse amplitude or stroke volume during inhalation and exhalation relative to a healthy patient. Further, a trend or pattern of such features may be used to assess the patient's fluid condition.

The present invention relates to a device and method for detecting light allowing retrieval of a physiological parameter of a user carrying said device. To improve the efficiency of light capturing, the device (1, 2, 3, 4) comprises a light source (10) arranged for emitting light of at least a first wavelength into tissue of the subject, a wavelength converter (20) arranged for receiving at least part of the emitted light after interaction of the emitted light with the tissue and for converting the received light into at least a second wavelength different from the first wavelength, and a light sensor (30) arranged for receiving light converted by said wavelength converter.

A wearable device is provided. The wearable device includes a first sensor having a light-emitting part and a light-receiving part, a second sensor having at least one electrode, and at least one processor electrically connected to the first sensor and the second sensor, wherein the at least one processor acquires PPG signal data by using the first sensor for a first time while the wearable device is worn on a user's body, acquires ECG signal data by using the second sensor for the first time for which the PPG signal is acquired, determines an inter-beat interval calculation model, based on the result of a comparison between the PPG signal data and the ECG signal data, and acquires, based on the determined inter-beat interval calculation model, an inter-beat interval of the user from PPG signal data measured for a second time after the first time.

Disclosed herein is a device for continuous physiological monitoring as well as systems and methods for interpreting data from such a device. The systems and methods may include automatically detecting, assessing, and analyzing exercise activity, physical recovery states, sleep states, and the like. The acquisition of continuous physiological data may facilitate automated recommendations concerning changes to sleep, recovery time, exercise routines, and the like.

An apparatus includes the following: a photoplethysmogram sensor head including a light emitter and a photo detector, wherein the photo detector is disposed in a diagonal orientation with respect to a light path from the light emitter to the light detector; and an opaque mask over the photo detector, wherein the mask covers at least partially that half of the photo detector that is at a greater distance from the light emitter and leaves a remaining half of the photo detector exposed.

An ear-worn device includes a speaker, an optical emitter, an optical detector, a processor, and a housing configured to be positioned within an ear of a subject, wherein the housing encloses the speaker, optical emitter, optical detector, and processor. The housing includes at least one window that exposes the optical emitter and optical detector to the ear of the subject, and the housing includes at least one aperture through which sound from the speaker can pass. Light transmissive material is located between the optical emitter and the at least one window and is configured to deliver light emitted from the optical emitter to an ear region of the subject at one or more predetermined locations. Light transmissive material is positioned between the optical detector and the at least one window and is configured to collect light external to the housing and deliver the collected light to the optical detector.