Patents
Literature
40 results about "Velocity waveform" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Method and apparatus for the noninvasive determination of arterial blood pressure
InactiveUS6514211B1Blood flow measurement devicesEvaluation of blood vesselsUltrasonic sensorTransmural pressure
Owner:TENSYS MEDICAL INC
Method and apparatus for the noninvasive determination of arterial blood pressure
InactiveUS6471655B1Blood flow measurement devicesEvaluation of blood vesselsTransmural pressureUltrasonic sensor
A method and apparatus for determining the mean arterial blood pressure (MAP) of a subject during tonometric conditions. In one embodiment, the apparatus comprises one or more pressure and ultrasound transducers placed over the radial artery of a human subject's wrist, the latter transmitting and receiving acoustic energy so as to permit the measurement of blood velocity during periods of variable compression of the artery. During compression, the ultrasound velocity waveforms are recorded and processed using time-frequency analysis. The time at which the mean time-frequency distribution is maximal corresponds to the time at which the transmural pressure equals zero, and the mean pressure read by the transducer equals the mean pressure within the artery. In another aspect of the invention, the ultrasound transducer is used to position the transducer over the artery such that the accuracy of the measurement is maximized. In yet another aspect of the invention, a wrist brace useful for measuring blood pressure using the aforementioned apparatus is disclosed.
Owner:TENSYS MEDICAL INC
Electronic cam control device and electronic cam curve generation method
An electronic cam control device is provided with an electronic cam curve generation unit which generates an electronic cam curve so as to pass through a plurality of designated coordinates that define a relationship between major axis positions and minor axis positions, and an output unit which outputs minor axis positions corresponding to the major axis positions as position instructions to an external device according to the electronic cam curve. The electronic cam curve generation unit generates an electronic cam curve in which a cam velocity waveform, in which the electronic cam curve has been differentiated with regard to the major axis positions, has intervals with a uniform cam velocity for each area that is between designated coordinates, and has monotonic acceleration / deceleration intervals connecting together intervals with a uniform cam velocity by accelerating or decelerating while monotonically increasing or monotonically decreasing between neighboring areas.
Owner:MITSUBISHI ELECTRIC CORP
Hemodynamics and signal analysis system and method of carotid arterial system
The invention provides a simple and convenient method and a simple and convenient system for evaluating hemodynamic indexes and characteristic parameters of a blood signal of a carotid arterial system through non-invasive detection on blood pressure of brachial arteries and an axial blood velocity signal of a common carotid artery. The method comprises the following steps: detecting the waveform and a numerical value of an axial blood velocity of the common carotid artery by using a continuous Doppler blood velocity waveform detecting module, detecting diastolic pressure and systolic pressure of a human body by using an arm-type electronic blood pressure detecting module, and then calculating hemodynamic parameters of the carotid arterial system by a simplified method; and selecting Morlet mother wavelet for wavelet analysis on the waveform of the blood velocity of the common carotid artery, and calculating the characteristic parameters of the blood signal. The method is an analysis method which combines the hemodynamic principle and wavelet transformation; compared with the method adopted by the conventional cerebral hemodynamic analysis device, the signal acquisition and analysis method is simpler; and to a great extent, the defects that the conventional analysis device is complicated in structure, huge in volume, complex in operation, high in price and the like are overcome.
Owner:DALIAN UNIV OF TECH +1
Method and apparatus for predicting material hypertension during pregnancy using coherence analysis of material and fetal blood velocity waveforms
InactiveUS20050065439A1Blood flow measurement devicesHeart/pulse rate measurement devicesPregnancyObstetrics
An embodiment of a method of predicting maternal hypertension during pregnancy is disclosed. The method may include measuring a maternal blood velocity waveform and measuring a fetal blood velocity waveform. The method may further include the calculation of a coherence value using a magnitude-squared coherence function between the maternal and fetal blood velocity waveforms and comparing the coherence value to a predetermined threshold value.
Owner:UNIV OF UTAH RES FOUND
Movement analysis display apparatus and movement analyzing method
A movement analysis display apparatus includes a analyzing unit for analyzing waveform data of a time series which is acquired from a movement sensor, and a display unit for displaying an analysis result that is analyzed by the analyzing unit. The analyzing unit includes a movement waveform generating section for generating a movement waveform from the waveform data, an energy balance value calculating means for calculating a movement energy ratio in opposed movement directions in a velocity waveform, an envelope curve generating section for generating an envelope curve at a given time width in a distance waveform, and a time integration curve analyzing section for integrating a movement waveform with respect to time.
Owner:HITACHI LTD
Method and apparatus for predicting material hypertension during pregnancy using coherence analysis of material and fetal blood velocity waveforms
InactiveUS7374539B2Blood flow measurement devicesHeart/pulse rate measurement devicesObstetricsPregnancy
An embodiment of a method of predicting maternal hypertension during pregnancy is disclosed. The method may include measuring a maternal blood velocity waveform and measuring a fetal blood velocity waveform. The method may further include the calculation of a coherence value using a magnitude-squared coherence function between the maternal and fetal blood velocity waveforms and comparing the coherence value to a predetermined threshold value.
Owner:UNIV OF UTAH RES FOUND
Vascular disease examining system and bypass vascular diagnosing device
InactiveUS7309313B2Diagnosing nosovascular diseasesBlood flow measurement devicesEvaluation of blood vesselsWaveform analysisFourier transform on finite groups
Disclosed are a vascular disease examination system capable of examining and diagnosing vascular diseases such as arterial obliteration by determining the feature quantities of blood flow velocity waveforms or blood pressure waveforms or blood flow rates, and a bypass vascular diagnosing system. A blood flow velocity or blood pressure at a target location of the body is measured A waveform analysis unit 4 determines the feature quantity of a blood flow waveform (or blood pressure waveform), for displaying on an output unit 5. The feature quantity includes a time constant, Fourier transform value, differentiated value, integrated value, rise / fall time, and sharpness or gradient of rise. Feature quantity of a blood flow velocity waveform (or blood pressure waveform) indicated in numeric value enables a correct examination / diagnosis.
Owner:CYBERDYNE INC
Haemodynamic Data Estimation Apparatus and Method of Use
ActiveUS20170181642A1Reduce pressureEffect blood flowBlood flow measurement devicesEvaluation of blood vesselsDiseaseKinetic information
A system and method for deriving information on disease in vascular segments for example mean pressure, drop in mean pressure and / or hydraulic resistance, from such measured waveforms is described. The waveforms can, for example, be measured non-invasively using Doppler ultrasound or magnetic resonance techniques. Form Factors (Vff, Pff) for the velocity waveform and the central arterial pressure are determined. Lesions may be detected and located using the estimated non-invasive hemodynamic information
Owner:BLUEDOP MEDICAL
Measuring device and method of laser vibration measuring instrument step response
InactiveCN106382979AAvoiding the Difficulties of High-Quality Step SignalsShort rise timeSubsonic/sonic/ultrasonic wave measurementUsing wave/particle radiation meansMeasurement deviceMeasuring instrument
The present invention relates to a measuring device and method of laser vibration measuring instrument step response and belongs to the photoelectric measurement technical field. The measuring device of the present invention comprises a measured laser vibration measuring instrument, a polarizer P1, a polarizer P2, a polarizing reflector M1, a semi-transmitting and semi-reflection mirror M2, an acousto-optic modulator AOM1, an acousto-optic modulator AOM2, an FM signal source, a square wave signal source, a sinusoidal signal source, a semi-transmitting and semi-reflection mirror M3, reflectors M4, M5, M6 and M7, a semi-transmitting and semi-reflection mirror M8, a photoelectric detector and the like. Optical frequency modulation signals are down-converted into a radio frequency range through beat-frequency processing; a signal waveform sequence is obtained by means of high-speed data acquisition and quantization technologies; instantaneous frequency accurate demodulation of laser frequency modulation signal waveforms is realized through a digitization mode, so that standard motion velocity waveforms and motion acceleration waveforms can be obtained; and problems in accurate measurement and value traceability of the step response of the laser vibration measuring instrument can be solved.
Owner:BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
Method for converting blasting-vibration acceleration into velocity
ActiveCN102346809AAvoid driftingConvenient guidanceSpecial data processing applicationsTime domainDecomposition
The invention discloses a method for converting blasting-vibration acceleration into velocity, which comprises the following steps: firstly, carrying out empirical mode decomposition, low-frequency processing and high-frequency threshold noise reduction processing on an acceleration data sequence; then, obtaining a velocity data sequence through time-domain integration; and finally, respectively carrying out piecewise least-squares correction on components having the drift phenomenon so as to obtain a high-precision velocity data sequence. By using the method for converting blasting-vibration acceleration into velocity disclosed by the invention, the problem of drifting can be effectively solved, and the similarity between a velocity waveform obtained by using the method and an actually-measured velocity waveform is more ideal, therefore, the method can guide the blasting construction better, and is beneficial for popularization.
Owner:ENG COLLEGE OF ENG CORPS PLA UNIV OF SCI & TECH
System and Method For Phase-Contrast MRI with Hybrid One-and Two-sided Flow Encoding and Velocity Spectrum Separation (HOTSPA)
ActiveUS20190053735A1Reduce temporal sampling period temporalReduce temporal temporal footprintImage enhancementImage analysisComputational physicsCondensed matter physics
Owner:RGT UNIV OF CALIFORNIA
Acoustic emission simulation method and system based on discrete element method
ActiveCN112487698AIncrease authenticityCalculation speedDesign optimisation/simulationCAD numerical modellingMonitoring siteDiscrete element method
The invention relates to an acoustic emission simulation method and system based on a discrete element method. The simulation method comprises the steps of: arranging monitoring points on the surfaceof a calculation model; monitoring the speed waveform of the monitoring point; and analyzing the speed waveform to obtain an acoustic emission number, energy and a b value. According to the method, the problems that a traditional acoustic emission simulation method is inconsistent in principle, poor in authenticity and too high in computing resource occupation can be solved.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Movement analysis display apparatus and movement analyzing method
A movement analysis display apparatus includes a analyzing unit for analyzing waveform data of a time series which is acquired from a movement sensor, and a display unit for displaying an analysis result that is analyzed by the analyzing unit. The analyzing unit includes a movement waveform generating section for generating a movement waveform from the waveform data, an energy balance value calculating means for calculating a movement energy ratio in opposed movement directions in a velocity waveform, an envelope curve generating section for generating an envelope curve at a given time width in a distance waveform, and a time integration curve analyzing section for integrating a movement waveform with respect to time.
Owner:HITACHI LTD
Blood flow velocity waveform automatic identification method based on an ultrasonic image
ActiveCN109615624AEasy extractionShorten the timeImage enhancementImage analysisImaging processingSonification
The invention discloses a blood flow velocity waveform automatic identification method based on an ultrasonic image, and belongs to the field of image processing algorithms. The method comprises the following steps: carrying out graying and binarization preprocessing on an image based on an acquired or shot clinical ultrasonic image containing a blood flow velocity waveform; based on the binarizedimage, carrying out transverse segmentation on the image by adopting a dichotomy, and segmenting a high-gray-value region below the blood flow velocity waveform; traversing upwards from the last lineof the segmented region as a whole, and identifying the boundary of the waveform, namely the blood flow velocity waveform when the maximum gray level gradient is experienced and no high-brightness gray level exists in the upward region with a certain length; and finally, traversing from the middle position of the waveform to two ends to remove non-waveform interferences such as figures and frames, and outputting a digital waveform. According to the method, automatic identification and digital output of the blood flow velocity waveform in the image are realized, and a foundation is laid for analysis work of the blood flow velocity waveform when waveform source data of the ultrasonic equipment cannot be obtained.
Owner:BEIJING UNIV OF TECH
Hemodynamic parameter estimation
PCT designated stageWO2026073761A1Blood flow measurement devicesOrgan movement/changes detectionArterial diameterHematological test
A method for non-invasive hemodynamic monitoring of patients. The method comprises using ultrasound to obtain a continuous blood velocity signal and continuous arterial diameter signal. The method further comprises extracting waveform features from these two signals which can be used to estimate hemodynamic parameters. A transfer function is used to convert values of a pre-defined set of waveform features into values of one or more hemodynamic parameters. To enhance accuracy, ultrasound data is acquired over a time window and an ensemble average blood velocity waveform is computed from a series of waveforms detectable in the blood velocity-time signal over said time window.
Owner:KONINKLIJKE PHILIPS NV
Evaluation System of Peripheral Artery Vascular Elasticity Based on Double Triangle Blood Flow Model
ActiveCN110141196BRealize functionCatheterDiagnostic recording/measuringVascular sclerosisBlood arterial
Owner:NORTHEASTERN UNIV LIAONING
A method and system for assessing car-t treatment-related neurotoxicity based on behavioral characteristics
ActiveCN121003418BDiagnostic signal processingEnsemble learningCross correlation analysisComputational physics
The application discloses a method and system for evaluating CAR-T treatment related neurotoxicity based on behavior characteristics, relates to the technical field of medical behavior analysis, and provides the following scheme, which comprises the following steps: synchronously collecting angular velocity time series data of double upper limbs of a patient and electromyographic signals corresponding to muscle surfaces of the double upper limbs; performing frequency band optimization filtering on the angular velocity time series data of the double upper limbs respectively; generating angular velocity waveforms; taking a wave peak time point of the angular velocity waveform as a reference; extending forward for a preset time length; and calculating an energy integral curve of the electromyographic signals. The angular velocity time series data of the double upper limbs is processed through frequency band optimization to generate angular velocity waveforms, the energy integral curve of the electromyographic signals is extracted forward based on the wave peak time point of the angular velocity, candidate time points are obtained, and local cross-correlation analysis is enabled to locate and intercept points when the wave peak value is lower than a preset threshold, so that the problem of missing weak tremor signals is solved, effective detection and reliable interception of low-amplitude tremors are realized, and weak signal features are avoided from being lost.
Owner:SUN YAT SEN UNIV
Method to Quantify the Hemodynamic and Vascular Properties in Vivo from Arterial Waveform Measurements
InactiveUS20200229711A1Sufficient complianceEvaluation of blood vesselsCatheterPeripheral pulsesPulse pressure
Disclosed herein are in vivo non-invasive methods and devices for the measurement of the hemodynamic parameters, such as blood pressure, cardiac output, stroke volume and vascular tone, of a subject, and the mechanical anelastic in vivo properties of the subject's arterial blood vessels. An exemplary method requires obtaining the peripheral pulse volume waveform (PVW), the peripheral pulse pressure waveform (PPW), and the peripheral pulse velocity wavefcirm. (PUW) from the same artery; calculating the time phase shift between the PPW and FM, and the plot of pulse pressure versus pulse volume; and determining the blood pressures and power law components of the anelastic model from the waveforms PPW and PVW, the cardiac output from the waveforms PPW and PUW, and the quality factor of the artery based. upon the calculations. The disclosed methods and devices can be used to diagnose and treat cardiovascular disease in a subject in need thereof.
Owner:HOCKING GRANT
Cargo throwing height identification method and system
PendingCN113850156AEffective throw heightThrowing height recognition is effectiveCharacter and pattern recognitionDesign optimisation/simulationWave shapeClassical mechanics
The invention discloses a cargo throwing height identification method and system. The identification method comprises the following steps: acquiring three-axis acceleration data of a cargo, and processing the three-axis acceleration data to obtain a vector acceleration waveform; judging a collision reason of the cargo based on the vector acceleration waveform; when the collision reason is judged to be throwing, determining a throwing interval section and a weightlessness interval section based on the vector acceleration waveform, and determining upward throwing time and falling time according to the throwing interval section and the weightlessness interval section; and according to the upward throwing time and the falling time, respectively calculating the upward throwing height and the falling height.
Owner:GREE ELECTRIC APPLIANCES INC
Haemodynamic data estimation
ActiveUS10966617B2Magnetic measurementsBlood flow measurement devicesDiseaseDecreased mean arterial pressure
Techniques exist for measuring local blood velocity of flow rate waveforms in, for example, mammalian vascular segments. A method and system for deriving information on disease in vascular segments, for example mean pressure, drop in mean pressure and / or hydraulic resistance, from such measured waveforms is described. The waveforms can, for example, be measured non-invasively using Doppler ultrasound or magnetic resonance techniques. Form factors (Vff, Pff) for the velocity waveform and the central arterial pressure are determined. Stenosis may be detected by detecting changes e.g in Vff / Pff.
Owner:BLUEDOP MEDICAL
Real-time reconstruction method of broadband coseismic velocity waveform based on fusion data of cascaded filtering
ActiveCN116449418BImprove experienceBand widthSeismic signal processingICT adaptationAccelerometer dataCarrier signal
The application provides a fusion data broadband coseismic velocity waveform real-time reconstruction method based on cascade filtering, which uses cascade filtering to fuse high-frequency GNSS original Doppler data, high-frequency GNSS carrier phase data and accelerometer data to realize broadband coseismic velocity waveform real-time reconstruction, and the realization process comprises the following steps: high-frequency GNSS / accelerometer co-located station real-time acquisition of high-frequency GNSS observation data, broadcast ephemeris and original acceleration data, and sending to a ground computing center; the ground computing center real-time calculation of high-frequency GNSS TDCP average velocity and high-frequency GNSS RD instantaneous velocity; the ground computing center zero offset correction of the real-time received original acceleration data to obtain zero offset correction acceleration data; and the ground computing center real-time reconstruction of the broadband coseismic velocity waveform of the high-frequency GNSS / accelerometer co-located station according to the high-frequency GNSS TDCP average velocity, the high-frequency GNSS RD instantaneous velocity and the zero offset correction acceleration data by using cascade filtering.
Owner:WUHAN UNIV
Acceleration monitoring device, acceleration monitoring method, and program
ActiveUS12560434B2Navigation by speed/acceleration measurementsTesting/calibration of speed/acceleration/shock measurement devicesWave shapeRemote sensing
Owner:MITSUBISHI HEAVY IND LTD
An acoustic emission simulation method and system based on discrete element method
ActiveCN112487698BIncrease authenticityCalculation speedDesign optimisation/simulationCAD numerical modellingMonitoring siteDiscrete element method
The invention relates to an acoustic emission simulation method and system based on a discrete element method. The simulation method includes: arranging monitoring points on the surface of a calculation model; monitoring the velocity waveform of the monitoring point; analyzing the velocity waveform to obtain the acoustic emission Emission number, energy, and b-value. The above-mentioned method in the present invention can solve the problems of inconsistent principles, poor authenticity, and high occupation of computing resources in the traditional acoustic emission simulation method.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
System and method for phase-contrast MRI with hybrid one-and two-sided flow encoding and velocity spectrum separation (HOTSPA)
ActiveUS10973434B2Reduce temporal sampling period and temporal footprintSave spaceImage enhancementImage analysisComputational physicsCondensed matter physics
A system and method is provided for acquiring flow encoded data from a subject using a magnetic resonance imaging (MRI) system. The method includes acquiring flow encoded (FE) data with alternating encoding polarities and along two of three orthogonal directions through the subject over at least two cycles of the flow within the subject; and separating the FE data into directional FE datasets using a temporal filter that separates the FE data based on temporal modulation of the FE directions caused by the alternating encoding polarities extending over the at least two cycles of the flow within the subject that shift the Fourier spectrum of velocity waveforms corresponding to the FE data. The method also includes using the directional FE datasets to generate an image of the subject showing flow within the subject caused by the at least two cycles of flow within the subject.
Owner:RGT UNIV OF CALIFORNIA
An automatic identification method of blood flow velocity waveform based on ultrasound image
ActiveCN109615624BEasy extractionShorten the timeImage enhancementImage analysisImaging processingClinical ultrasound
The invention relates to an automatic identification method of blood flow velocity waveform based on an ultrasonic image, which belongs to the field of image processing algorithms. The method is based on the collected or photographed clinical ultrasound images containing blood flow velocity waveforms, and performs grayscale and binarization preprocessing on the images; The area of high gray value below the waveform; traverse upwards from the last line of the segmented area as a whole, and when the maximum gray gradient is experienced and there is no high-brightness gray in a certain length of area that continues upward, the boundary of the waveform can be identified. That is, the blood flow velocity waveform; finally, it traverses from the middle position of the waveform to both ends to remove the non-waveform numbers, borders and other interferences, and output the digital waveform. The invention realizes the automatic identification and digital output of the blood flow velocity waveform in the image, and lays a foundation for the analysis of the blood flow velocity waveform when the waveform source data of the ultrasonic equipment cannot be obtained.
Owner:BEIJING UNIV OF TECH
Deep learning-based blasting vibration velocity waveform simulation method and system
The invention provides a blasting vibration speed waveform simulation method and system based on deep learning, and relates to the technical field of engineering blasting, and the method comprises the steps: collecting blasting vibration speed waveform data of a plurality of different monitoring points and corresponding blasting parameters for multiple times, and carrying out the preprocessing, so as to construct a database for model training; constructing a Unet-VAE-GAN model, enabling the model to learn a nonlinear mapping relation between a blasting parameter and a blasting vibration speed waveform through training, and generating a potential vector; establishing a multi-layer perceptron model, and establishing a nonlinear mapping relationship between different blasting parameters and potential vectors of the Unet-VAE-GAN model through training; and inputting the actual blasting parameters into the trained multilayer perceptron model to output a corresponding potential vector, and inputting the output potential vector into the trained Unet-VAE-GAN model to generate a simulated blasting vibration speed waveform.
Owner:WUHAN UNIV OF TECH
Flexible ultrasonic patch for continuously monitoring multi-dimensional physiological parameters of blood vessel
PendingCN121533757AHeart/pulse rate measurement devicesInfrasonic diagnosticsNerve networkBlood vessel
The invention discloses a flexible ultrasonic patch for continuous monitoring of multi-dimensional physiological parameters of blood vessels, relates to the technical field of medical instruments, and utilizes a designed flexible ultrasonic array to extract high-resolution carotid artery wall velocity motion waveforms by parallelly collecting multi-channel data, so that the blood vessel multi-dimensional physiological parameters can be continuously monitored, and the blood vessel multi-dimensional physiological parameters can be continuously monitored. And signal delays among different array elements can be calculated to obtain local pulse wave velocities (PWV). Moreover, the speed waveform, the heart rate, the amplitude, the calculated PWV and other key physical parameters are jointly input into a PINN (Physical Information Neural Network) framework, and the cuff blood pressure is used as a gold standard for training. According to the method integrating physical information (PWV) and deep learning, the defects that a traditional physical model is too simplified and a pure black box model lacks generalization ability are overcome, and the blood pressure prediction result is more accurate and robust and has a physical basis.
Owner:BEIJING INST OF TECH +1
Haemodynamic data estimation apparatus and method of use
A system and method for deriving information on disease in vascular segments for example mean pressure, drop in mean pressure and / or hydraulic resistance, from such measured waveforms is described. The waveforms can, for example, be measured non-invasively using Doppler ultrasound or magnetic resonance techniques. Form Factors (Vff, Pff) for the velocity waveform and the central arterial pressure are determined. Lesions may be detected and located using the estimated non-invasive hemodynamic information
Owner:BLUEDOP MEDICAL LTD
Inertia identification method, system and storage medium based on velocity interpolation
ActiveCN112398395BHigh precisionElectronic commutation motor controlVector control systemsSquare waveformAlgorithm
The invention belongs to the technical field of inertia identification, and discloses an inertia identification method, system and storage medium based on speed interpolation, and uses different improved MRAS inertia identification algorithms for inertia identification based on different input speed waveforms. Determine whether the input speed waveform is a triangle wave or square wave; when the input speed waveform is a triangle wave, select the improved MRAS inertia identification algorithm based on the triangle wave input for MRAS inertia identification; when the input speed waveform is a square wave, select the improved MRAS based on the square wave input. The inertia identification algorithm performs the MRAS inertia identification. The present invention uses triangular wave and square wave as the input speed signal to perform inertia identification, which has the problem of low precision. A targeted and improved MRAS inertia identification algorithm is proposed to improve the accuracy of inertia identification results. Compared with other improved solutions of MRAS, the present invention has the characteristics of less computational burden and more practicality.
Owner:GUANGDONG TOPSTAR TECH +1