A method and apparatus for hemodynamically characterizing a neurological or fitness state by dynamic scattering light (DLS) is disclosed herein. In particular, a non-pulsatile blood-shear-rate-descriptive (BSRD) signal(s) is optically generated and analyzed. In some embodiments, the BSRD signal is generated dynamically so as to adaptively maximize (i.e. according to a bandpass or frequency-selection profile) a prominence of a predetermined non-pulsatile physiological signal within the BSRD. In some embodiments, the BSRD is subjected to a stochastic or stationary-status analysis. Alternatively or additionally, the neurological or fitness state may be computed from multiple BSRDs, including two or more of: (i) a [sub −200 Hz, ˜300 Hz] BSRD signal; (ii) a [˜300 Hz, ˜1000 Hz] signal; (iii) a [˜1000 Hz, ˜4000 Hz] signal and (iv) a [˜4000 Hz, z Hz] (z>=7,000) signal.

Example implementations relate to an implantable device that can accommodate a vessel of a living body and can detect light transmitted across the vessel. The implantable device transmits a wireless transmitter signal corresponding to the intensity of the detected light. The intensity of the detected light correlates to patency of the vessel.

An interchangeable sensor device for a functional near-infrared spectroscopy system (fNIRS) is a non-invasive device intended to detect changes in the concentration of hemoglobin species on any body surface area. The device includes a plurality of measurement units having different elastic configurations, each intended to be adapted to a specific area of the body, and a control unit for controlling any of the measurement units. Each of the measurement units is equipped with a first connector and the control unit is equipped with a second connector, which connectors allow the control unit to be interchangeably connected to any of the measurement units.

An apparatus for estimating a core body temperature of an object is provided. According to one embodiment, the apparatus includes a plurality of sensors configured to obtain data from an object and a processor configured to obtain a surface temperature, a heat flux, a skin blood flow rate, and a blood flow velocity by using the data obtained from the plurality of sensors, obtain a skin thermal conductivity based on the skin blood flow rate, and estimate a core body temperature of the object based on the surface temperature, the heat flux, the skin thermal conductivity, and the blood flow velocity of the object.

A thermal imaging extremity abnormal perfusion detector system includes a computer processor configured to receive, analyze and store thermal images and a thermal imaging camera communicatively coupled to the processor, and configured to take at least one of photograph and video thermal images and output the thermal images to the processor. The camera is configured to be secured adjacent a patient workspace that is shaped to contain a patient; and points the thermal imaging camera at the workspace such that, responsive to taking at least one thermal image, the at least one thermal image contains the patient who is placed within the workspace. The computer processor is configured to analyze the at least one thermal image and determine from the at least one thermal image a difference in thermal states indicating altered perfusion in an extremity of the patient.

A device is provided for diagnostic measurement by simultaneous multimodal analysis of a subject's head wherein the cerebral blood flow variations as well as the concentration level of oxygenation in the subject's blood are used to determine the presence and the pathophysiology of neurocognitive disorders, including the neurodegenerative disease referred to as Alzheimer's disease.

This fluid measuring device is provided with: an irradiation unit that irradiates a fluid with light; a light receiving unit that receives light scattered by the fluid; a detecting unit that detects a backflow of the fluid on the basis of a light reception signal from the light receiving unit; and a calculating unit that calculates, on the basis of the detection result by the detection unit and the light reception signal from the light receiving unit, estimated fluid information indicating the flow rate or flow speed of the fluid. Accordingly, even when a backflow of the fluid temporarily occurs, the flow speed of the fluid can be precisely measured.

According to one embodiment of the present disclosure, a biometric sensor includes a flexible substrate, a first light-emitting part disposed on one side of the flexible substrate to output first light toward the body, a second light-emitting part disposed on one side of the flexible substrate to output second light different from the first light toward the body, an elastomer disposed on one side of the flexible substrate in a shape surrounding the first light-emitting part and the second light-emitting part, and a light-receiving part disposed on the other side of the flexible substrate to receive third light corresponding to the first light and fourth light corresponding to the second light.

Coherent light (e.g., laser light) is emitted into a cranium through an optical fiber. A tissue sample (e.g., red blood cells, blood vessels, brain tissue) within the cranium diffuses the coherent light. Different tissue sample motion quantities generate different coherent light interference patterns. An image of a coherent light interference pattern is captured with an image sensor coupled to an optical element. The speckle contrast of the image quantifies coherent light interference pattern. A waveform of sequentially captured speckle contrast values over time has characteristics that reflect intracranial blood flow health. If waveform characteristics indicate poor or questionable intracranial blood flow heath, a notification message is displayed, played, or otherwise transmitted.

A method for characterizing a state of an end effector of an ultrasonic device is disclosed. The ultrasonic device including an electromechanical ultrasonic system defined by a predetermined resonant frequency. The electromechanical ultrasonic system further including an ultrasonic transducer coupled to an ultrasonic blade. The method including applying, by an energy source, a power level to the ultrasonic transducer, measuring, by a control circuit coupled to a memory, an impedance value of the ultrasonic transducer, comparing, by the control circuit, the impedance value to a reference impedance value stored in the memory; classifying, by the control circuit, the impedance value based on the comparison; characterizing, by the control circuit, the state of the electromechanical ultrasonic system based on the classification of the impedance value; and adjusting, by the control circuit, the power level applied to the ultrasonic transducer based on the characterization of the state of the end effector.