12 results about "Pulse Transit Time" patented technology

A system for measuring the propagation time of light pulses between at least two cells. The presented system further enables the calculation of the distance between at least two units (101a, 101b), and the successive derivative of the distance with respect to time, in different configurations. Bidirectional light time transfer between the two cells is used to calculate the propagation time of the light pulses generated by the light source of each cell.

A system and method for determining blood flow using multi-wavelength photoplethysmography is provided. The method including: receiving the photoplethysmography signals from an optical input sensor positioned to capture the photoplethysmography signals from the skin of a user, the photoplethysmography signals including at least two different optical wavelengths; determining arteriolar pulse transit time using time delays determined between the photoplethysmography signals of different wavelengths; determining skin blood flow as a function of the determined arteriolar pulse transit time; and outputting the skin blood flow.

The present invention provides a method and a device for calibrating a blood pressure estimation model for determining tonoarteriogram (TAG) signals, which relates to a cross field between biomedicine and scientific engineering. The method comprises: after applying a first pressure to a first preset location, determining individual pulse transit time (PTT) of a respective pulse wave at a preset region during a preset movement process in a plurality of preset time periods; for each of the preset time period, acquiring a first pressure at the respective first moment of time and a first height difference of the first preset location relative to a heart location; acquiring a second pressure according to the first pressure at all of the first moment of time; determining a sample blood pressure information within the preset time period according to the second pressure and the first height difference to calibrate the blood pressure estimation model, and obtaining a continuous beat-to-beat blood pressure information according to the blood pressure estimation model, obtaining TAG signals according to the beat-to-beat blood pressure information and a target PPG signal. The present invention calibrates the blood pressure estimation model without the need of a cuff-type blood pressure measurement device, and a high-precision TAG signals can be obtained.

This application relates to a method and device for monitoring vascular parameters. The method includes: acquiring finger pressure information and finger arterial physiological information during a monitoring period; obtaining the actual value of the oscillation envelope using the finger arterial physiological information, and obtaining the actual value of the pulse transit time using the finger arterial physiological information; obtaining a first model; obtaining a second model; and simultaneously optimizing the objective function using the first and second models to obtain estimated values ​​of vascular parameters during the monitoring period. The objective function is generated based on a first error and a second error, where the first error is obtained from the actual value of the oscillation envelope and the estimated value of the oscillation envelope generated based on the first model, and the second error is obtained from the actual value of the pulse transit time and the estimated value of the pulse transit time generated based on the second model. This method can improve the accuracy and robustness of vascular parameter estimation.

The application discloses an old person emotional accompanying and health management large model for fusing child voice synthesis, and relates to the technical field of intelligent old people care and emotional accompanying. The system continuously collects physiological data such as blood pressure, heart rate and pulse transit time of the old person, calculates the deviation degree of each physiological characteristic parameter and combines the deviation degree into a physiological deviation vector; converts the deviation degree into an objective condition description text, generates a care feeling description text from the child's perspective by using a lightweight language model; analyzes the emotional tone and concern degree score from the text, and maps to generate voice emotional control parameters containing speech speed factors and fundamental frequency offset; after the dialogue is triggered, the child character reply text, the child voiceprint embedding vector and the voice emotional control parameters are input into the voice synthesis engine, and the child digital avatar voice suitable for the real-time physical condition of the old person is output. The application synchronizes the emotional expression of the child voice with the health condition of the old person, and improves the realism and empathy effect of the digital avatar accompanying.

The present disclosure describes a system for detecting abnormal blood pressure or blood volume in a user, the system comprising a processing system; a pulse transit time (PTT) detection system for providing a PTT signal indicative of a PTT of the user to the processing system, wherein PTT of the user is used as a surrogate for a blood pressure (BP) of the user; and an electrodermal activity (EDA) detection system for providing an EDA signal indicative of an EDA of the user to the processing system; wherein the processing system processes the PTT signal and the EDA signal to determine an index indicative of an abnormal blood pressure or blood volume of the user.

In one embodiment, a method includes acquiring a motion signal by an IMU sensor of a wearable device and acquiring a PPG signal by a PPG sensor of the wearable device, where the PPG sensor is synchronized with the IMU sensor. The method further includes determining, from the IMU signal, an AVO of a wearer of the wearable device; determining from the PPG signal, a pulse arrival time of the wearer; and estimating, based on (1) the AVO determined from the IMU signals and (2) the pulse arrival time determined from the PPG signal, a PTT of the wearer.

A self-training system is provided, including: a respiration measurement unit, a blood oxygen measurement unit, a blood pressure measurement unit, an electrode unit, an audio stimulation unit, a display unit and a control unit. The display unit displays a virtual image including a plurality of display areas when the display unit is in a normal mode. Said display areas respectively correspond to a pulse transit time data, a brainwave signal, a heart rate variability data, a breathing signal, a heart rate data, a blood pressure data and a blood oxygen saturation signal. The control unit controls the said display areas to display respective real-time display charts according to respective signals and data, and controls the audio stimulation unit to play a binaural beats with frequency following response so that the user can receive stimulations and guidance to lower blood pressure and relieve physiological and psychological stress.

A system for measuring the propagation time of optical pulses between at least two units. The presented system further enables the calculation of the distance between at least two units (101a, 101b), and the successive derivatives of said distance with respect to time, in various configurations. The bidirectional optical time transfer between two units is used for the calculation of the propagation time of optical pulses, which are generated by the optical source of each unit.

A hearing aid comprising a physiological sensor is disclosed, the hearing aid being comprised in a system comprising an input unit, an output unit, a signal-to-noise ratio estimator, a processing unit, a memory unit, at least a first and a second physiological sensor; the system being configured to: determine, based on the first physiological sensor, a first time point corresponding to a first maximum upstroke point of a first measured parameter; determine, based on the second physiological sensor, a second time point corresponding to a second maximum upstroke point of a second measured parameter; determine a current pulse transit time by calculating a time difference between the first time point and the second time point; and determine a current listening effort of a hearing aid user based on the current pulse transit time and a stored reference set of signal-to-noise ratios and pulse transit times.

In one embodiment, a method includes acquiring a motion signal by an IMU sensor of a wearable device and acquiring a PPG signal by a PPG sensor of the wearable device, where the PPG sensor is synchronized with the IMU sensor. The method further includes determining, from the IMU signal, an AVO of a wearer of the wearable device; determining from the PPG signal, a pulse arrival time of the wearer; and estimating, based on (1) the AVO determined from the IMU signals and (2) the pulse arrival time determined from the PPG signal, a PTT of the wearer.

In the field of medical imaging, suboptimal settings for contrast-enhanced scan sequences can lead to impaired images and in turn to less accurate diagnosis or the need for repeat scans. There is therefore provided a method for adapting a medical imaging procedure to patient characteristics. The method comprises: obtaining (302) at least one measurement of a patient-specific physiological parameter, comprising at least one measurement of pulse transit time of a patient; based on the at least one measurement of pulse transit time, determining (304) a setting for at least one patient-specific system-control parameter for carrying out the medical imaging procedure, wherein the at least one patient-specific system-control parameter comprises at least one substance administration parameter that relates to administration of a substance to the patient for facilitating the medical imaging procedure; and outputting (306) the determined setting for the at least one patient-specific system-control parameter for carrying out the medical imaging procedure. The method thus utilizes pulse transit time as a dynamic feedback parameter for system control in medical imaging, such as for sequence timing and the administration of substances such as contrast agents and beta blockers.