A temperature measurement system for measuring a temperature of a measured surface includes: 1) a first temperature sensor; and 2) a reference surface including a second temperature sensor integrated therein. The first temperature sensor includes a field of view simultaneously covering both at least a portion of the measured surface and at least a portion of the reference surface, thus is configured for simultaneously taking a first measurement of both the portion of the measured surface and the portion of the reference surface. The first measurement of the reference surface taken by the first temperature sensor is compared to a second measurement taken by the second temperature sensor for use in calibrating the first temperature sensor.

A computer program product, apparatus, and method may include various operations. The operations may include calibrating a sensor device to identify a heading, wherein the sensor device includes an inertial measurement unit, receiving three-dimensional motion data from the sensor device secured to a body part of a person as the person performs an activity involving movement of the body part, and causing generation of output based on the three-dimensional motion data, wherein the output is based on the movement of the sensor device.

Methods and systems for sensor calibration and sensor glucose (SG) fusion are used advantageously to improve the accuracy and reliability of orthogonally redundant glucose sensor devices, which may include optical and electrochemical glucose sensors. Calibration for both sensors may be achieved via fixed-offset and/or dynamic regression methodologies, depending, e.g., on sensor stability and Isig-Ratio pair correlation. For SG fusion, respective integrity checks may be performed for SG values from the optical and electrochemical sensors, and the SG values calibrated if the integrity checks are passed. Integrity checks may include checking for sensitivity loss, noise, and drift. If the integrity checks are failed, in-line sensor mapping between the electrochemical and optical sensors may be performed prior to calibration. The electrochemical and optical SG values may be weighted (as a function of the respective sensor's overall reliability index (RI)) and the weighted SGs combined to obtain a single, fused SG value.

A system for continuous non-invasive blood pressure monitoring may include processing circuitry configured to determine calibration data for a continuous non-invasive blood pressure model at a calibration point, receive, from an oxygen saturation sensing device, a PPG signal at a particular time subsequent to the calibration point, derive values of the set of metrics for the patient from the PPG signal, and determine, using the continuous non-invasive blood pressure model and based at least in part on inputting the calibration data determined at the calibration point, the values of the set of metrics, and an elapsed time at the particular time since the calibration point into the continuous non-invasive blood pressure model, a blood pressure of the patient at the particular time.

A blood pressure detection method, an apparatus, and an electronic device are provided, having relatively accurate blood pressure detection results and are convenient to detect. The blood pressure detection method is applied to a blood pressure detection apparatus, and the method includes: acquiring blood pressure calibration information, the blood pressure calibration information being information obtained by processing according to a first pressure acting on a user and a first PPG signal when the first pressure acts on the user; acquiring a second PPG signal, and processing according to the second PPG signal to obtain the user's initial blood pressure; and calibrating the initial blood pressure according to the blood pressure calibration information, and using the blood pressure obtained by calibration as the blood pressure of the user. In this technical solution, there is no need to resort to an external device such as a blood pressure meter for assistance.

Provided are an MLA-OCT imaging catheter (3), a calibration method of the MLA-OCT imaging catheter, an MLA-OCT imaging system and an imaging method thereof. The MLA-OCT imaging catheter (3) comprises an inner tube (5), an outer tube (4) and a multi-core catheter connector (6), wherein the inner tube (5) comprises an optical fiber bundle (21) and a microlens array (7). In the MLA-OCT imaging system, a light source (14) is divided into a sample light and a reference light by an interferometer (15), wherein the sample light enters a signal arm to reach human tissue, while the reference light enters a reference arm to reach an optical delay line; the light returned from said two locations is respectively a first optical signal and a second optical signal, and the reference arm is provided with an optical delay line device. The MLA-OCT imaging method includes: adjusting the position of an optical delay line by a data processing device according to the signal-to-noise ratio of the interference signal until the signal-to-noise ratio is the highest, at this time the value of the delay time for the optical delay line of each optical fiber is the calibration value of the optical delay line which is stored in an MLA-OCT system; automatically setting the arm length of a reference arm by the MLA-OCT system based on the calibration value of the optical delay line, so as to detect the interference signal; and actuating an MLA-OCT imaging catheter (3) to move axially by a retracement controller to perform axial scanning, so as to generate a three-dimensional image of human tissue.

The present disclosure relates to a method for calibrating a blood glucose value in a continuous blood glucose measurement system. More particularly, blood glucose values can be accurately calibrated according to a calibration mode by differently selecting calibration modes for calibrating blood glucose values on the basis of whether the difference between a blood glucose value measured by a continuous blood glucose measurement system and a reference blood glucose value measured by a separate blood glucose meter is outside a set range. In addition, the blood glucose value of a user can be accurately calibrated by activating, to be scrolled on an input window, only the ranges of the blood glucose value and a reference blood glucose value calculated on the basis of a preset critical range, or by forcibly or automatically calibrating the blood glucose value by a second calibration mode which uses multiple reference blood glucose values, when a reference blood glucose value outside the reference blood glucose value range is input.

Various embodiments enable calibrating a non-invasive blood pressure measurement device by determining multiple parameters defining a stress-strain relationship of an artery of a patient. The device may obtain output signals from a blood pressure sensor at two or more measurement elevations. The obtained measurement signals may be filtered into AC and quasi-DC components, and results fit to exponential functions to calculate an arterial time constant and a veinous time constant related to vein draining/filling rates. The arterial and veinous time constants may be used to calculate an infinity ratio. The infinity ratio and the obtained sensor output may be used to calculate values for multiple parameters defining a stress-strain relationship of a measured artery. Once defined, this stress-strain relationship may be stored and applied to future sensor output signals (e.g., blood pressure measuring sessions) to infer patient blood pressure.

Apparatus and methods are operative to probe the condition of a sensor either initially, at any point thereafter or continuously during a continuous sensor operation for measuring an analyte in a bodily fluid (such as performed by, e.g., a continuous glucose monitoring (CGM) sensor). Results of the probe may include calibration indices determined from electrical signals obtained during the probe. The calibration indices may indicate whether in-situ adjustment of the sensor's calibration should be performed either initially and/or at random check points. Probing potential modulation parameters also may be used during analyte calculations to reduce the effects of lot-to-lot sensitivity variations, sensitivity drift during monitoring, temperature, interferents, and/or the like. Other aspects are disclosed.

Methods and devices to monitor an analyte in body fluid are provided. Embodiments include continuous or discrete acquisition of analyte related data from a transcutaneously positioned in vivo analyte sensor automatically or upon request from a user. The in vivo analyte sensor is coupled to an electronics unit holding a memory with instruction to cause processing circuitry to initiate a predetermined time period that is longer than a predetermined life of the sensor, during the predetermined time period, convert signals from the sensor related to glucose to respective corresponding glucose levels, without relying on any post-manufacture independent analyte measurements from a reference device, and at the expiration of the predetermined time period, disable, deactivate, or cease use of one or more feature.