34 results about "Blood volume pulse" patented technology

A blood glucose monitoring system is disclosed which provides for inducing an active pulse in the blood volume of a patient. The induction of an active pulse results in a cyclic, and periodic change in the flow of blood through a fleshy medium under test. By actively inducing a change of the blood volume, modulation of the volume of blood can be obtained to provide a greater signal to noise ratio. This allows for the detection of constituents in blood at concentration levels below those previously detectable in a non-invasive system. Radiation which passes through the fleshy medium is detected by a detector which generates a signal indicative of the intensity of the detected radiation. Signal processing is performed on the electrical signal to isolate those optical characteristics of the electrical signal due to the optical characteristics of the blood.

Methods for remotely measuring or monitoring one or more physiological parameters in a subject, such as blood volume pulse, heart rate, respiratory wave, or respiration rate, are provided. The methods include capturing a series of images of the subject, and processing the images to obtain physiological parameters of interest. These methods can be used to analyze single channel signals, including signals obtained from active night vision cameras. As a result, these methods can be used to measure or monitor one or more physiological parameters in both daylight and low-light conditions. Also provided are methods of removing false positives. Systems for remotely measuring or monitoring one or more physiological parameters in a subject, as well as methods of using thereof, are also provided.

The invention belongs to the technical field of non-invasive blood pressure detection and particularly relates to a non-invasive blood pressure continuous detection device and a non-invasive blood pressure continuous detection method. The non-invasive blood pressure continuous detection device comprises a volume pulse wave image detection module, an electrocardiogram detection module and a signal analysis processing module; the volume pulse wave image detection module is used for acquiring a direct current component and an alternate current component in a blood volume pulse wave; the electrocardiogram detection module is used for acquiring an electrocardiosignal of a human body; and the signal analysis processing module is used for acquiring PWV (Pulse Wave Velocity) information according to the electrocardiosignal acquired by the electrocardiogram detection module and the alternate current component detected by the volume pulse wave image detection module, acquiring blood vessel radius information according to the alternate current component and the direct current component and acquiring continuous blood pressure information according to the PWV information and the blood vessel radius information. Due to implementation of the non-invasive blood pressure continuous detection device and the non-invasive blood pressure continuous detection method which are disclosed by the invention, influence of variation of the blood vessel radius on the blood pressure in the long-term non-invasive blood pressure measurement process is removed, accuracy of long-term detection is improved, and times of continuously calibrating the blood pressure are reduced.

The invention discloses a method and device for identity authentication. The method includes the steps that a biological characteristic image of a person to be authenticated is obtained through a camera device, the obtained biological characteristic image of the person to be authenticated is matched with a pre-stored biological characteristic image, bio-assay is carried out on the person to be authenticated on the basis of a blood volume pulse signal of the person to be authenticated, and the person to be authenticated passes the identity authentication when the obtained biological characteristic image of the person to be authenticated is successfully matched with the pre-stored biological characteristic image and the person to be authenticated passes the bio-assay on the basis of the blood volume pulse signal. According to the method and device, biological identification is combined with the bio-assay carried out on the person to be authenticated through the blood volume pulse signal; when the camera device is used for obtaining the biological characteristic image of the person to be authenticated for biological identification, the bio-assay is carried out through the blood volume pulse signal, and safety and reliability of biological identification are improved.

The invention provides a physiological parameter sensing system (50) and method in which physiological information indicative of at least one physiological parameter is derived. The approach of the invention is based on constructing multiple pulse signals from different weighted combinations of at least two detection signals, derived from detected electromagnetic radiation directed onto or through a subjects skin region. The weightings are based on different of a set of various blood volume pulse vectors. A quality indication value is derived for each generated pulse signal, where this is based on a derived relationship between an obtained heart rate signal for the patient and the pulse signal. The blood volume pulse vector resulting in the pulse signal having the highest quality indicator value and/or from the derived pulse signal itself is used to derive the physiological parameter information.

The invention relates to an endothelial cell function screening and diagnosing apparatus, which is equipment for screening and diagnosing endothelial cell functions and belongs to a medical instrument. The endothelial cell function screening and diagnosing apparatus comprises a peripheral circulation blood volume pulse wave digitalized detector, an automatic brachial artery pressurizing device, an embedded system with an expanded diagnosis function, an arithmetic module, a touch screen, a printing and expanding port and the like. The total endothelial cell function screening and diagnosing apparatus is a portable floor-mounted machine, and realizes spectrum analysis of peripheral circulation blood volume pulse waves under a flow-mediated condition, and a result of the spectrum analysis is excellently relevant to the endothelial cell functions. The endothelial cell function screening and diagnosing apparatus has the advantages that brachial artery blockage time is short, screening and diagnosing are simple, convenient and fast, a total process of recovering to a normal state from vasodilation caused by the flow-mediated condition can be observed, and the endothelial cell function screening and diagnosing apparatus is fine in reproduction, high in precision, low in cost and easy in popularization, and has the expanded diagnosis function.

An optical vital signs sensor (100) is provided, which comprises a PPG sensor (102), a force transducer (130) configured to measure a force applied via the PPG sensor (102) to a skin (1000) of the user and a processing unit (140) configured to extract information regarding a blood volume pulse from the output of the PPG sensor (102) and to map the extracted information to the blood pressure value at a specific force applied to the PPG sensor (102).

A system for determining a physiological signal of a person supported by a person support apparatus using signals from force transducers is described herein. Force transducers communicate with a controller to transmit signals indicative of weight acting on them. The controller determines blood volume pulse information from the signals received from the force transducers. Heart rate and respiratory rate information is derived from the blood volume pulse information.

A system is configured to diagnose sleep comprising an apparatus configured to be attached to a patient; the apparatus comprises: i) an optical sensor configured to measure a blood volume pulse of the patient; and ii) a wireless communication interface configured to wirelessly transmit the measured blood volume pulse. The system further comprises means for performing: i) obtaining the wirelessly transmitted measured blood volume pulse; and ii) deriving from the blood volume pulse the peripheral arterial tone; iii) determining occurrences of sleep events from changes in the peripheral arterial tone.

The invention discloses a non-contact detection method for the heart rate. The method comprises the following steps that a forehead glabellar periphery of an examinee in a video is selected as an interested area, and a blood volume pulse signal is extracted; each frame of image of the shot video is decomposed into different spatial resolutions, the color change is amplified, through an image synthesis technology, a final image is obtained through synthesis, a gray average of each frame of the interested area image of the synthesized final image is acquired through solution, a change waveform of a gray average frame follow-up series is drawn, and a blood volume pulse wave waveform is obtained; the obtained blood volume pulse wave waveform is subjected to noise removal reconstruction throughthe wavelet basis function, and the reconstructed blood volume pulse wave waveform is subjected to FFT transformation to obtain a spectrogram of the waveform, and a frequency, corresponding to the largest energy, in the frequency domain is a frequency of the heart rate. According to the non-contact detection method for the heart rate, non-contact detection of a common industrial camera or a camera is achieved, the measurement result is high in accuracy, detection is conveniently conducted, and the demand for daily heart rate detection can be met.

The invention belongs to the technical field of data information processing, and discloses a controller work fatigue monitoring method and system, computer equipment and a medium. The controller work fatigue monitoring method comprises the steps that a blood volume pulse sensor transmits collected and processed heart rate variability signals to a data analysis platform, and the data analysis platform compares and analyzes the collected and processed heart rate variability signals with a set threshold value; and displaying the lamps with different colors based on the comparative analysis result. According to the invention, on one hand, the blood volume pulse sensor (PPG) is clamped on the earlobe of the controller, so that the data can be accurately acquired, and the normal work of the blood volume pulse sensor is not influenced; on the other hand, whether the airplane is fatigue or not and the fatigue level are prompted through red light, yellow light and green light, and the fatigue state can be prompted while a controller is not affected to command the airplane to operate in a voice communication mode. In conclusion, the application prospect is very wide.

A heart rate detection method based on a multi-scale video comprises the following steps that 1, a video pyramid is established, specifically, on the basis of an original tracking box, the size of anROI is reduced downwards, and the size of the ROI is increased upwards; step 2, blood volume pulse BVP signal extraction: a blood volume pulse signal needs to be extracted from a multi-scale channel,a multi-scale signal fusion algorithm is used for promotion and optimization of a skin tone orthogonal plane method, and when the scale feature of a pyramid is only on one layer, the proposed heart rate extraction method is the skin tone orthogonal plane method; and step 3, multi-scale signal fusion: signal fusion is performed on heart rate signal characteristics of multiple scale channels by adopting Gaussian prior convex combination, and signal processing is performed on multi-scale fusion signals to finally obtain a heart rate value. According to the method, rich heart rate features on different scales are extracted by changing the frequency, and the features are fused to improve the heart rate detection precision.

The invention relates to a human body physiological health parameter measuring device and method, in particular to a human body heart rate, respiration and blood oxygen comprehensive measuring deviceand method. The invention aims to solve the problems that in the prior art, the size is large, operation is complex, the authenticity of a test signal is affected, the error is large, the function issingle, and the waveform of the blood volume pulse wave is not displayed, and provides the human body heart rate, respiration and blood oxygen comprehensive measurement device and method. A display screen mounting groove is formed in the top of a shell arranged on a base, and a fixing piece mounting groove is formed in the side face; a capacitive display screen is mounted in the display screen mounting groove; a light source camera fixing piece is mounted in the fixing piece mounting groove; a light source mounting hole is formed in the bottom of the light source camera fixing piece, and a camera mounting hole is formed in the top; an LED compound color light source is mounted in the light source mounting hole, and a color camera is mounted in the camera mounting hole; a development boardis located in the shell; and the development board is connected with an external power supply through a power adapter. The method is carried out by using the device.

The invention relates to non-contact blood pressure measuring equipment based on a face video. The non-contact blood pressure measuring equipment comprises a face video acquisition terminal, a data enhancement module, a spatial feature processing module and a neural network calculation module, wherein the face video acquisition terminal is used for acquiring the face video and performing ROI splicing and feature extraction on each frame of image in the face video to obtain a feature sequence; the data enhancement module is used for enhancing dimension features of blood volume pulse wave related information in a color space by adopting a YUVT color space according to the feature sequence obtained by the face video acquisition terminal to obtain a video sequence after the dimension features are enhanced; the spatial feature processing module is used for calculating feature vectors of the video sequence after the dimension features are enhanced, splicing the feature vectors of all frames into a spatial-temporal feature map and performing spatial slicing on the spatial-temporal feature map to form a multi-time-domain spatial feature map; the neural network calculation module is used for performing high-dimensional feature extraction on the multi-time-domain spatial feature map and enhancing time-domain feature association of the extracted high-dimensional features by using LSTM to obtain a blood pressure measuring model.

Disclosed is a hand-held, medical, multi-channel biological information acquisition mobile terminal system, comprising two signal sensing gloves RL with a cable end embedded therein, for use in acquiring a variety of biological signals comprising multi-channel interconnected ECG, heart sounds, finger blood volume pulse, and skin impedance etc., the signal sensing gloves RL also comprising a signal acquisition device S, a signal transmission device C connected to the signal acquisition device S, and a mobile terminal T connected wirelessly or with a wired connection. The system has the characteristics of low power consumption, small size, low cost and fewer control channels needed for multi-channel connection; and the system can achieve on-site acquisition of a variety of biological information and the mobile function of electronic health records.

The invention relates to the technical field of interrogation, in particular to an intelligent interrogation research and judgment method. The method comprises the following steps: A) uninterruptedly acquiring face video data of a tested object through a camera, and performing face positioning and recognition on the video; collecting sound data of the tested object through a microphone; b) calculating the heart rate, the blood pressure, the respiration rate and the heart rate variability of the tested object by positioning and extracting the blood volume pulse signal of the tested object in the video; extracting sound emotion characteristic parameters of the tested object, and establishing an LSTM (Long Short Term Memory) model for the sound; and C) on the basis of the big data, calculating the heart rate, the blood pressure, the respiration rate and the heart rate variability of the tested object, and obtaining parameters. According to the method, the face video data and the sound data of the interrogated person are acquired, and the face video data and the sound data are calculated to assist the interrogation person in discrimination, so that the interrogation time can be effectively shortened, and the interrogation efficiency is improved.

The invention discloses a non-contact detection method for the oxyhemoglobin saturation. The method comprises the following steps that an industrial camera or a camera is started for recording a facevideo of an examinee; a forehead glabellar periphery of the examinee in the video is selected as an interested area, and a blood volume pulse wave signal is extracted; images, different in resolutionratio, of an interested frequency band and corresponding original images are added and synthesized to obtain a final image, the gray average change of the interested area is used for representing thechange of the illumination intensity of reflection light, and a blood volume pulse wave waveform is obtained; an interested frequency band signal is reconstructed, a reconstruction signal is used forobtaining a blood volume pulse wave alternating component waveform graph, peak valley value information of a pulse wave is extracted from the graph to obtain an average value through solution, and anoxyhemoglobin saturation value is obtained through calculation. According to the method, non-contact detection of a common industrial dual-camera with an optical filter is achieved, the measurement result is high in accuracy, detection is conveniently conducted, and the demand for daily oxyhemoglobin saturation detection can be met.

The invention discloses a dual-mode imaging method and system for skin blood perfusion characterization, which can be used for monitoring skin blood perfusion and solves the problems that in the prior art, when skin blood perfusion is monitored, skin blood flow velocity distribution and blood volume pulse waves cannot be obtained at the same time, and skin blood perfusion cannot be comprehensively evaluated. According to the dual-mode imaging method for skin blood perfusion characterization, two video imaging systems are adopted for synchronous control, blood volume and laser speckle video images are collected in real time and synchronously processed, blood flow velocity distribution and blood volume pulse waves are obtained at the same time, and real-time and comprehensive monitoring of blood perfusion of the skin to be detected is achieved. In order to achieve the method, the invention further provides a dual-mode imaging system for skin blood perfusion characterization, and the system comprises a laser light source, a collimation beam expander, a green light source, a beam splitter, a first optical filter, a first video imaging module, a second optical filter, a polaroid and a second video imaging module.