Abstract: A blood pressure measurement device includes an outer case; a base; a pump provided on the base such that the pump is shifted from a center of the outer case and located on one side as viewed in a circumferential direction of a living body; a drive unit provided on the base and located on one side of the pump as viewed in a direction orthogonal to the circumferential direction; an on-off valve provided on another side of the pump as viewed in the direction orthogonal to the circumferential direction; a pressure sensor provided on said another side of the pump as viewed in the direction orthogonal to the circumferential direction; and packing provided between the on-off valve and the pressure sensor and the base.

Abstract: The present disclosure generally relates to user interfaces for navigating and providing physical activity information.

Abstract: A method for determining a sharpness index of a pulse wave signal includes receiving a pulse wave signal; determining a first reference line starting point and a second reference line starting point on the basis of a curvature of the pulse wave signal; determining a first reference line connecting the first reference line starting point and a first reference line ending point by determining the first reference line ending point by applying an intersecting tangent method to the first reference line starting point, and determining a second reference line connecting the second reference line starting point and a second reference line ending point by determining the second reference line ending point by applying the intersecting tangent method to the second reference line starting point; and determining a sharpness index by using a peak point of the pulse wave signal, the first reference line, and the second reference line.

Abstract: An aspect of some embodiments of the invention relate to a system for tissue characterization using an acousto-electric effect comprising: at least one ultrasonic waveform generator; at least one waveform generation controller; at least one set of electrodes; at least one electric signal amplification circuitry connectable to at least one of said at least one set of electrodes to generate an amplified signal; and at least one signal processing unit for analyzing said amplified signal and to generate information related to properties of multiple locations within a target tissue; wherein at least one of said multiple location has no direct contact with any electrode, and wherein said properties of said multiple locations are obtained within up to 10 milliseconds per location on average.

Abstract: A physiological detection device includes system including a first array PPG detector, a second array PPG detector, a display and a processing unit. The first array PPG detector is configured to generate a plurality of first PPG signals. The second array PPG detector is configured to generate a plurality of second PPG signals. The display is configured to show a detected result of the physiological detection system. The processing unit is configured to convert the plurality of first PPG signals and the plurality of second PPG signals to a first 3D energy distribution and a second 3D energy distribution, respectively, and control the display to show an alert message.

Abstract: The present disclosure relates to a computer-implemented process for evaluating user activity, user preference, and/or user habit via one or more personal devices and providing precisely timed and situationally targeted prompts and stimuli for encouraging lifestyle choices and reinforcing health habits. It is an object of the present disclosure to provide a technological solution to the long felt need in health management services caused by the technical problem of procuring timely health management by encouraging healthy choices.

Abstract: A medical device for measuring blood flow through a blood vessel of a mammal includes a conductive elastomer having a variable resistance. A frame is at least partially surrounding at least a portion of the conductive elastomer, the conductive elastomer is suspended within the frame. A mechanical amplification element is slidably engaged to the conductive elastomer, the mechanical amplification element being configured to slide within the frame and to contact skin of the mammal over the blood vessel when the frame is positioned over the blood vessel, the mechanical amplification element being configured to be displaced when the artery pulsates and changes the resistance of the elastomer.

Abstract: The present disclosure relates to a pair of intelligent glasses and a glasses box. The intelligent glasses can include a frame assembly having an inner frame portion and an outer frame portion that is arranged around the inner frame portion, a detection component configured to detect physiological characteristics of a wearer, a control component connected with the detection component and configured to acquire a control signal generated according to the physiological characteristics and a treatment component, connected with the control component and configured to output treatment signals according to the control signal. One or more accommodating spaces are formed between the inner frame portion and the outer frame portion. The treatment signals include at least one of a phototherapy signal, a sonic wave signal, a sound wave signal, magnetic waves, or electromagnetic waves. The detection component, the control component and the treatment component are located in the accommodating spaces.

Abstract: A pulse wave measurement device includes an electrode unit and a pulse wave measurement unit including pairs of current applying electrodes and voltage measuring electrodes. The electrode unit includes a substrate with insulating properties, measurement electrodes, connection electrodes electrically connected to the measurement electrodes in a 1-to-1 manner, and an adhesive layer. The pulse wave measurement unit includes a belt member configured to wrap around a living body and cover the electrode unit attached to a body surface. The pair of current applying electrodes and the pair of voltage measuring electrodes are disposed on an inner circumferential surface of the belt member so that, when the belt member is in a wrapped state around a living body, each one of the pair of current applying electrodes and each one of the pair of voltage measuring electrodes come into contact with any one of the connection electrode.

Abstract: The present disclosure relates to a computer-implemented process for generating and providing simulated user absorption information pertaining to users and based on target profiles and target situations, thereby providing user targeted and situationally targeted content recommendations. It is an object of the present disclosure to provide a technological solution to the long felt need in small scale content recommendation systems caused by the technical problem of generating situationally targeted and user profile targeted content recommendations for users of an interactive electronic system.

Abstract: A blood pressure monitor including a manually operable pressurizer is disclosed. The blood pressure monitor may include a cuff configured to apply a pressure to a target portion of a body of a user, a pressurizer, a depressurizer, and a sensor to measure a blood pressure. The pressurizer may include a rotator, and be configured to supply a fluid to the cuff, to cause the cuff to apply the pressure, through rotation of the rotator caused by an external rotational force applied to the blood pressure monitor to rotate the rotator. The depressurizer may be configured to reduce the applied pressure applied by the cuff to the target portion.

Abstract: The present disclosure relates to a computer-implemented process for evaluating user activity, user preference, and/or user habit via one or more personal devices and providing precisely timed and situationally targeted content recommendations. It is an object of the present disclosure to provide a technological solution to the long felt need in small scale content recommendation systems caused by the technical problem of generating situationally targeted and user preference targeted content recommendations for users of an interactive electronic system.

Abstract: Disclosed are devices and methods for non-invasively measuring arterial stiffness using pulse wave analysis of photoplethysmogram data. In some implementations, wearable biometric monitoring devices provided herein for measuring arterial stiffness have the ability to automatically and intelligently obtain PPG data under suitable conditions while the user is engaged in activities or exercises. In some implementations, wearable biometric monitoring devices are provided herein with the ability to remove PPG data variance caused by factors unrelated to arterial stiffness. In some implementations, wearable biometric monitoring devices have the ability to perform PWA while accounting for the user's activities, conditions, or status.

Abstract: A method for utilizing a multi-disciplined learning tool regarding a topic includes generating a fundamental illustrative model based on illustrative assets of a lesson that includes learning objects. The method further includes modifying the fundamental illustrative model to illustrate first and second sets of teaching assets of a first learning object to produce first and second learning illustrative models. When enabled, the method further includes modifying the fundamental illustrative model to illustrate third and fourth sets of teaching assets of a second learning object to produce third and fourth learning illustrative models. The method further includes outputting at least the first and second learning illustrative models.

Abstract: Disclosed are methods for determining physiological parameters of an individual including blood pressure, arterial compliance, flow velocity, and pressure wave velocity. A noninvasive method for determining the blood pressure of a patient is based on measurements of flow velocity, pulse wave velocity and arterial compliance. A noninvasive method for determining the arterial compliance of a patient is based on measurements of blood pressure, flow velocity, and pulse wave velocity.

Abstract: Disclosed is a biosensor arrangement structure, including: a plurality of biosensors that is disposed in a seat for supporting an occupant and that measures a health condition of the occupant. The seat includes: a seat body for holding the occupant; and an auxiliary supporter for supporting a body part of the occupant except for a torso and thighs. At least one of the plurality of biosensors is disposed at the auxiliary supporter.

Abstract: A capacitive sensing system is adapted for noninvasive measurement of blood pulse (hear rate). A capacitive sensor is located near a skin pulse point exhibiting pulse displacement of skin tissue from vascular pulsation (for example, the temple area of the head), and includes a sensor electrode disposed over and spaced from the skin pulse point, such that the distance between sensor electrode and the skin pulse point cycles between a proximal and a distal displacement distance based on vascular pulsation.

Abstract: The present disclosure relates to a computer-implemented process for evaluating user activity, user preference, and/or user habit via one or more personal devices and providing precisely timed and situationally targeted prompts and stimuli for encouraging lifestyle choices and reinforcing health habits. It is an object of the present disclosure to provide a technological solution to the long felt need in health management services caused by the technical problem of procuring timely health management by encouraging healthy choices.

Abstract: A surface of a vehicle component can be dynamically deformable surface. The dynamically deformable surface can be configured to undergo deformations to dynamically form a dynamic button or other user interface element on demand. The dynamically deformable surface can include one or more biosensors. When a user engages the dynamic button with a portion of the body, the one or more biosensors can acquire user biodata. The user biodata can be used by the vehicle as input for various purposes. For instance, the vehicle can operate as a health-monitoring and/or comfort monitoring system. As a result of these arrangements, buttons and other user interface elements can appear and disappear depending on the need and/or application, providing a cleaner vehicle cockpit interface and greatly expanding the possibilities of where such buttons can be located at and how many things can be controlled by the driver using physical interfaces.

Abstract: The present disclosure relates to a computer-implemented process for generating and providing simulated user absorption information pertaining to users and based on target profiles and target situations, thereby providing user targeted and situationally targeted content recommendations. It is an object of the present disclosure to provide a technological solution to the long felt need in small scale content recommendation systems caused by the technical problem of generating situationally targeted and user profile targeted content recommendations for users of an interactive electronic system.

Abstract: A method of controlling an analysis of electromagnetic (EM) signal of a human subject. The method comprises positioning an EM transducer unit in front of a skin area above a target intrabody volume of a human subject, the EM transducer unit having at least one EM transducer, a pressure applying unit that applies a variable pressure on the skin area, and a pressure sensor, measuring at least one pressure parameter indicative of the variable pressure using the pressure sensor, capturing EM signal using the at least one EM transducer, and performing an analysis of the EM signal to infer at least one intrabody parameter of the target intrabody volume. The analysis is controlled according to the at least one pressure parameter.

Abstract: A time sequenced series of optical images of a patient is obtained at a rate faster than cardiac frequency, wherein the time sequenced series of images capture one or more physical properties of intrinsic contrast. A cross-correland signal from the patient is obtained. A cross-correlated wavelet transform analysis is applied to the time sequenced series of optical images to yield a spatiotemporal representation of cardiac frequency phenomena. The cross-correlated wavelet transform analysis comprises performing a wavelet transform on the time-sequenced series of optical images to obtain a wavelet transformed signal, cross-correlating the wavelet transformed signal with the cross-correland signal to obtain a cross-correlated signal, filtering the cross-correlated signal at cardiac frequency to obtain a filtered signal, and performing an inverse wavelet transform on the filtered signal to obtain a spatiotemporal representation of the time sequenced series of optical images.

Abstract: The present disclosure relates to a computer-implemented process for evaluating user activity, user preference, and/or user habit via one or more personal devices and providing precisely timed and situationally targeted content recommendations. It is an object of the present disclosure to provide a technological solution to the long felt need in small scale content recommendation systems caused by the technical problem of generating situationally targeted and user preference targeted content recommendations for users of an interactive electronic system.

Abstract: A pulse sensor is capable of measuring a pulse rate of a wearer at a peripheral artery. In an embodiment, the pulse sensor includes a magnet supported to move responsive to an arterial pulse and a magnetometer configured to detect changes in a magnetic field produced by the magnet. The magnet may include a plurality of ferromagnetic particles disposed in or on a flexible substrate configured to be held adjacent to human skin subject to arterial palpation and a magnetic sensor configured to sense movement of the ferromagnetic particles. A system and method may measure hydration includes using a pulse sensor to measure pulse rate and modulation. The wearer is prompted when the pulse rate and pulse modulation indicate a response to dehydration of the wearer.

Abstract: An electronic device includes a sensor configured to acquire a pulse wave of a subject and a controller configured to analyze, based on the pulse wave of the subject acquired by the sensor, the rate of change in the pulse wave at a predetermined time after the point in time exhibiting a peak of the pulse wave and to estimate the blood glucose level of the subject based on the rate of change.

Abstract: A device for generating a projected image based on an activity related parameter includes a first sensor for detecting the activity related parameter, a second sensor for detecting an orientation of the device, a processor coupled to the first sensor for creating information from the detected activity related parameter, a light source for emitting a light beam from the device to project the created information as an image onto a surface outside the device and at least a first actuator for adjusting a relative direction of the light beam with respect to the detected orientation of the device. The surface outside the device is a ground surface and a distance between the device and the projected image is a function of the detected activity related parameter.

Abstract: A pressurizing/depressurizing section (4) performs at least one of air feeding to a cuff (20) by way of an air way (3) and air discharging by way of the air way (3) to thereby increase or decrease an internal pressure of the cuff (20). A first controlling section (5) causes the pressurizing/depressurizing section (4) to initiate the air feeding while performing the air discharging to thereby cause the internal pressure to transit from a pressure transient state to a pressure steady state or from the pressure steady state to the pressure transient state. A determining section (6) determines Whether the internal pressure has transited to the pressure steady state by way of the pressure transient state. A second controlling section (7) causes the pressurizing/depressurizing section (4) to suppress or stop the air discharging while continuing the air feeding, in accordance with determination made by the determining section (6).

Abstract: The subject matter of the invention of the present application is non-invasive equipment for monitoring blood flows and/or respiratory cycles of a human or animal body, comprising at least one segment of conductive elastomer with variable resistance arranged so as to extend over the circumference of the body element and sensitive to the length of the circumference of said element, means for capturing said length by virtue of said variable resistance and supplying a signal representing said length, and means for processing said signal, comprising means for extracting parameters of the blood flows and/or respiratory cycles to be monitored.

Abstract: Input data, output data having a plurality of output parameters obtained by analyzing the input data, and a plurality of associations between the input data and the output data are stored. A division condition for dividing an output data distribution in which the output data is plotted for two axes corresponding to two parameters among the plurality of output parameters is extracted, the output data distribution is divided according to the division condition, and output data of the divided output data distribution is derived as first and second output data distribution rules corresponding to the two axes. First and second output data distribution region candidates are calculated by applying the first and second output data distribution rules to new input data, and an output data distribution region of the new input data is estimated by combining the first and second output data distribution region candidates with each other.

Abstract: A blood pressure measurement device according to one aspect includes: a blood pressure measurement unit configured to measure blood pressure at a measurement target site of a measurement target subject; a pulse transit time measurement unit configured to measure a pulse transit time at the measurement target site of the measurement target subject; a blood pressure value calculation unit configured to calculate a blood pressure value, on the basis of measurement results of the pulse transit time and a relational expression representing a correlation between the pulse transit time and the blood pressure; a posture instruction unit configured to instruct the measurement target subject to assume a plurality of postures in which height positions of the measurement target site with respect to a heart of the measurement target subject are different from each other; and a calibration unit configured to calibrate the relational expression, on the basis of the blood pressure measured by the blood pressure measurement u

Abstract: The method and apparatus disclosed herein determine a user cadence from the output of an inertial sensor mounted to or proximate the user's body. In general, the disclosed cadence measurement system determines the user cadence based on frequency measurements acquired from an inertial signal output by the inertial sensor. More particularly, a cadence measurement system determines a user cadence from an inertial signal generated by an inertial sensor, where the inertial signal comprises one or more frequency components. The cadence measurement system determines a peak frequency of the inertial signal, where the peak frequency corresponds to the frequency component of the inertial signal having the largest amplitude. After applying the peak frequency to one or more frequency threshold comparisons, the cadence measurement system determines the user cadence based on the peak frequency and the frequency threshold comparison(s).

Abstract: A user-specific workout can be generated by adjusting transform parameters of a user-agnostic training profile to conform to a user boundary specifying a user's ability to perform work. The user-agnostic training profile can be defined in a training space, specifying a power curve in a time domain whereas the user boundary can be defined in a boundary space, specifying amounts of user-produced work in a time window size domain. A training boundary can be generated based on the user-agnostic training profile by determining the largest area under the user-agnostic training profile power curve for various time window sizes, where each largest area under the user-agnostic training profile power curve produces a data point for the training boundary for that window size domain value. The training boundary can be transformed based on the user boundary, causing corresponding transformations to the user-agnostics training profile, converting it to a user-specific workout.

Abstract: Wrist-worn devices and methods for measuring blood oxygen saturation using a wrist-worn device compute blood oxygen saturation by processing an output signal from one or more photodetectors indicative of absorption of light by a finger interfaced with the one or more photodetectors. A method includes transmitting a first wavelength light into a finger from a first light emitter mounted to a wrist band of the wrist-worn device. A second wavelength light is transmitted into the finger from a second light emitter mounted to the wrist band. An output signal indicative of absorption by the finger of the first wavelength light and the second wavelength light is generated by one or more photodetectors interfaced with the finger and disposed on a housing of the wrist-worn device. The output signal is processed with a processor disposed in the housing to compute blood oxygen saturation.

Abstract: Wearable pulse pressure wave sensing devices are presented that generally provide a non-intrusive way to measure a pulse pressure wave travelling through an artery using a wearable device. In one implementation, the device includes an array of pressure sensors disposed on a mounting structure which is attachable to a user on an area proximate to an underlying artery. Each of the pressure sensors is capable of being mechanically coupled to the skin of the user proximate to the underlying artery. In addition, there are one or more arterial location sensors disposed on the mounting structure which identify a location on the user's skin likely overlying the artery. A pulse pressure wave is then measured using the pressure sensor of the array closest to the identified location.

Abstract: The present disclosure relates to a computer-implemented process for evaluating user activity, user preference, and/or user habit via one or more personal devices and providing precisely timed and situationally targeted content recommendations. It is an object of the present disclosure to provide a technological solution to the long felt need in small scale content recommendation systems caused by the technical problem of generating situationally targeted and user preference targeted content recommendations for users of an interactive electronic system.

Abstract: An ergonomically designed smart wristband for clinical-grade multiparameter monitoring is disclosed. The smart wristband incorporates multiple sensors including custom-designed reflective arterial pulse sensors, a thermopile sensor, and electrocardiogram (ECG) electrodes. When the smart wristband is worn on the wrist, the biosensors contact the skin. The smart wristband may tether wirelessly to a mobile or any other computing device to continuously acquire and stream information like arterial pulse waveform and temperature data. Algorithms running on the computing device or onboard microprocessor analyze the acquired data to report parameters like blood pressure, body temperature, respiration, and blood oxygen. The device can also operate in a fully-standalone mode to accomplish continuous multiparameter physiological monitoring, analysis, and reporting.

Abstract: A blood pressure measurement apparatus includes a measuring device that includes a plurality of pressure sensors and is for measuring blood pressure information for each heartbeat in a measurement target, and an arrangement state inferring unit for extracting a feature quantity from an output waveform of each of the pressure sensors for each heartbeat, and inferring an arrangement state of the measuring means relative to an artery that is the measurement target based on a distribution profile of values of the feature quantity for the plurality of pressure sensors. The apparatus also includes a reliability calculating unit for calculating a reliability of the blood pressure information measured by the measuring means, based on the inferred arrangement state.

Abstract: Method and systems provide for reliable, convenient, and cost-effective personalized assessment of hemodynamic status in the ambulatory heart failure patient. The method and apparatus use pulse contour analysis of data obtained through observation of the patient for determination of hemodynamic status, and for determination of day-to-day changes in hemodynamic status. Observational assessment of the patient includes monitoring during activities of daily living including sleeping, sitting and standing. These activities create changes in venous return that are used to evaluate cardiac function or changes in cardiac function. The method and system infer body position by using position and motion information obtained by the system. Changes in cardiac function over time or due to changes in body pose are evaluated for the assessment of hemodynamic status, with a focus on changes resulting from fluid overload.

Abstract: A belt to be mounted around a measurement site; first pulse wave sensor and second pulse wave sensor mounted on the belt, separated from each other, configured to detect pulse waves in an artery passing through the measurement site; and pressing member mounted on the belt, capable of pressing first pulse wave sensor and second pulse wave sensor against the measurement site while varying pressing force. Time difference between first and second pulse wave signals is acquired as pulse transit time. Blood pressure is calculated based on the pulse transit time acquired by the measurement processing unit by using a predetermined correspondence equation between pulse transit time and blood pressure. Pulse transit time is acquired with the measurement processing unit while pressing force by pressing member is changed in resting state, and corresponding equation is calibrated based on plurality of pulse transit times corresponding to plurality of respective pressing forces.

Abstract: Disclosed are a heart rate detection system and a wearable device using the same. The heart rate detection system includes a light emitting unit, a light sensor and a processor. The light emitting unit emits a light to a human body. The light sensor senses a reflected light of the light and accordingly generates a first electric signal. The processor calculates the low-frequency noise signal and the high-frequency noise signal of the first electric signal, and removes them. After that, the processor executes a peak detection with respect to the first electric signal to calculate peak values of the first electric signal, and calculate a heart rate based on the time intervals among the peak values.

Abstract: A blood volume monitor includes a carrier mountable on a subject's body part. A measuring arrangement is mounted on the carrier. The measuring arrangement provides data relating to a change in volume of the body part, and outputs signals representative of the change. A control unit is in communication with the measuring arrangement to process data output by the measuring arrangement to determine, using the volume data, the volume of the body part and determines blood volume in the body part. The control unit uses the response signals received from the measuring arrangement and the determined volume of the part of the body to determine the blood volume.

Abstract: A sensing component includes multiple piezoelectric pressure sensors. The piezoelectric pressure sensor includes a piezoelectric material layer, a thin film transistor array and an induced electrode. The piezoelectric material layer is configured to measure pulse at multiple positions to generate the corresponding multiple pulse signals. The thin film transistor array electrically coupled to the piezoelectric material layer includes multiple transistors. The transistor includes a first terminal, a second terminal and a control terminal. The first terminal is configured to receive one of the pulse signals. The second terminal coupled to a data line is configured to output a first sensing signal according to the one of the pulse signals. The control terminal is configured to receive a clock signal. The induced electrode coupled to the piezoelectric material layer is configured to receive another one of the pulse signals to output a second sensing signal.

Abstract: A biological information analysis device including: an indicator extraction unit that is configured to extract, from time-series data regarding blood pressure waveforms consecutively measured by a sensor that is configured to be worn on a body part of a user and to be capable of non-invasively measuring a blood pressure waveform for each heartbeat, data regarding blood pressure waveforms corresponding to a period of time in which a change in blood pressure occurs, and extract an indicator that is related to the functionality of respiratory organs of the user, based on characteristics of the blood pressure waveforms corresponding to the period of time; and a processing unit that performs processing that is based on the indicator thus extracted.

Abstract: A system, method and apparatus is disclosed, comprising a biomathetical model for optimizing cognitive performance in the face of sleep deprivation that integrates novel and nonobvious biomathematical models for quantifying performance impairment for both chronic sleep restriction and total sleep deprivation; the dose-dependent effects of caffeine on human vigilance; and the pheonotypical response of a particular user to caffeine dosing, chronic sleep restriction and total sleep deprivation in user-friendly software application which itself may be part of a networked system.

Abstract: The present disclosure relates to a computer-implemented process for evaluating user activity, user preference, and/or user habit via one or more personal devices and providing precisely timed and situationally targeted content recommendations. It is an object of the present disclosure to provide a technological solution to the long felt need in small scale content recommendation systems caused by the technical problem of generating situationally targeted and user preference targeted content recommendations for users of an interactive electronic system.

Abstract: A method and device is provided for the continuous estimation of the blood pressure using a noninvasive technique. The method involves sensing of the displacement signal generated by the palpation of the radial artery. The radial artery is modelled as a cylindrical voight type viscoelastic tissue for the estimation of the personalized blood pressure. The model includes the displacement signal and a set of parameters as an input. The set of parameters include a mean radius of the artery, a radius at zero mmHg, a viscoelastic damping parameter, an elasticity of the artery and a thickness of wall of artery. The method involves the optimization of the set of parameters using heuristic optimization techniques, which helps in the estimation of the systolic and diastolic blood pressure. The method and device can also be personalized for individualized monitoring and estimation of the blood pressure of the person.

Abstract: A physiological detection system including an array sensor and a processing unit is provided. The array sensor is configured to output array PPG signals. The processing unit is configured to construct a 3D energy distribution according to the array PPG signals to accordingly identify different microcirculation states.

Abstract: A monitoring device configured to be attached to a subject includes a sensor configured to detect and/or measure physiological information and a processor coupled to the sensor. The sensor includes at least one optical emitter and at least one optical detector. The processor receives and analyzes signals produced by the sensor, and the processor changes wavelength of light emitted by the at least one optical emitter in response to detecting a change in subject activity. For example, the processor instructs the at least one optical emitter to emit shorter wavelength light in response to detecting an increase in subject activity, and the processor instructs the at least one optical emitter to emit longer wavelength light in response to detecting an decrease in subject activity. Detecting a change in subject activity may include detecting a change in at least one subject vital sign and/or subject motion.

Abstract: A system for monitoring the fetal size of an expectant mother comprises an acoustic sensor for positioning over the belly of the expectant mother, the acoustic sensor configured to receive an acoustic signal generated by the fetal heartbeat and to generate a sensor output signal. A fetal size is determined from a sensor output signal strength. This system is based on the realization that certain acoustic signals generated by the fetal heart beat are strongly correlated with the fetus size.

Abstract: A viscoelastic characteristics acquisition device is a device that acquires viscoelastic characteristics of a blood vessel of an inspection target, and includes a pulse wave acquisition unit that acquires a time waveform corresponding to a volume pulse wave of the inspection target, a spectrum acquisition unit that acquires a volume pulse wave spectrum by performing Fourier transform on the time waveform, an input unit to which values corresponding to maximum blood pressure and minimum blood pressure of the inspection target are input, and an analysis unit that acquires the viscoelastic characteristics on the basis of the values corresponding to the maximum blood pressure and the minimum blood pressure and the volume pulse wave spectrum at a frequency equal to or higher than a frequency corresponding to the pulse of the inspection target.