47 results about "Mean blood pressure" patented technology

The apparatus and methods of the present invention provide a non-invasive measurement of blood pressure with a frequency that approximates a continuous measurement. Blood pressure measurement provides information that is both clinically and diagnostically significant. In accordance with an aspect of the present invention, a method for providing a non-invasive measurement of blood pressure, includes obtaining a first input signal and a second input signal indicative of occlusive measurements of systolic blood pressure and diastolic blood pressure, respectively; tracking a signal indicative of pulse pressure; continuously measuring a third signal indicative of mean blood pressure; and processing the signals to obtain a measurement indicative of systolic and diastolic blood pressure, wherein at least a portion of the measurement indicative of systolic and diastolic blood pressure is continuous. The second input signal indicative of diastolic blood pressure is analyzed to identify a maximum amplitude of the signal, the maximum amplitude being indicative of the diastolic blood pressure measurement.

Oscillometry or another method is employed to initially determine a mean blood pressure and a diastolic blood pressure. There is a similarity between an intra-arterial pressure waveform exactly representing blood pressure and a pulse wave form generated when a cuff occludes a site to be measured. This similarity is utilized to obtain blood pressure. More specifically, the cuff occludes a site to be measured, while a pulse wave is detected. From the detected pulse wave's maximum amplitude an estimated mean arterial pressure is obtained. The obtained estimated mean arterial pressure and the pulse wave's minimum value are regarded as a mean blood pressure and a diastolic blood pressure, respectively. From the pulse wave's maximum value a systolic blood pressure is obtained by an arithmetic operation.

The invention relates to an individualized correction method and a device used for continuous measurement and estimation of arterial blood pressure by pulse wave. The PWTT (Pulse Wave Translation Time) of a measured person is recorded in real time, the mean blood pressure BP1 is acquired and recorded, the PWTT1 at the corresponding time is obtained, and the two data are taken as a first set of data. Then, the PWTT of the measured person is continuously monitored and recorded and at each time of monitoring that the absolute value of a difference between the present PWTT value and the PWTT value in the set of data recorded previously is larger than a domain value, an oscillography blood pressure instrument is triggered to measure the present mean blood pressure value BPn of the measured person. In this way, two or more sets of PWTT values and corresponding mean BP values are sequentially acquired in a monitoring time section, and two or more sets of data are taken as calculating data to calculate the individualized regression coefficients a and b of an equation A. The method and the device are easy in operation and implementation, and can enable the calculated regression coefficients to more agree with the actual conditions of measured individuals.

The invention provides a device for measuring pulse waves and blood pressures. The device comprises a wrist strap, a pulse wave sensor, a balloon, a gas source, a pressure sensor, a collection unit and a calculation unit, wherein the wrist strap is used for wrapping the wrist of the human body, and the balloon is arranged in the wrist strap and capable of being pressurized and depressurized. The pulse wave sensor is arranged on the wrist strap, and acquires first pulse waves through directly collecting pulse vibration pressure from the radial artery in real time. The gas source supplies gas with the pressure controllable to the balloon. The pressure sensor is arranged on a conveying pipeline of the gas source and the balloon and used for detecting gas pressures in the wrist strap. The collection unit collects the first pulse waves and the gas pressures. The calculation unit is connected with the collection unit and calculates the mean blood pressure, the systolic pressure and the diastolic pressure according to the gas pressures with the pulse waves as correction parameters.

A method for measuring systolic blood pressure includes raising the cuff pressure in such a manner that two conditions are satisfied: (1) The cuff air pressure takes sufficient time to reach the SBP value to avoid blood pressure in the arteries under the PPG sensor being too low, thereby avoiding collapse of the arterioles under the PPG sensor; and (2) The increase of the cuff air pressure between the DBP value and the SBP value is not overly slow in a manner which would cause a relatively high mean blood pressure in the arteries distal to the cuff, and could lead to reduced sensitivity in detecting the restart of blood flow when the cuff air pressure decreases to just below SBP value.

In an electronic blood pressure monitor, a data storing portion stores data of a blood pressure obtained by blood pressure measurement in a memory in association with a condition at the time of the blood pressure measurement. An average value calculation portion calculates average blood pressure data based on a blood pressure data group measured after getting up in the memory, and also calculates average blood pressure data based on a blood pressure data group measured before going to bed in the memory. A display control portion displays a relation between the calculated average blood pressure data on a display portion in a prescribed display manner.

A blood pressure monitor and a method for calculating blood pressure thereof are revealed. The blood pressure monitor includes a cuff, an air pump, an air escape valve, a pressure sensor, a processing circuit, and an arithmetic circuit. The cuff is arranged a a body to be detected while and the air pump inflates the cuff and the air escape valve is for releasing air from the cuff. The pressure sensor is disposed on the cuff for detecting cuff pressure to generate analog pressures sensing signals. The processing circuit processes the analog pressure sensing signals and generates digital pressure sensing signals. A slope of each digital pressure sensing signal is calculated by the arithmetic circuit. A pressure value of the digital pressure sensing signal corresponding to a maximum slope is an average blood pressure. Then find a second derivative of each digital pressure sensing signal. A pressure value of the digital pressure sensing signal corresponding to a largest maximum value of the second derivative is systolic pressure while a pressure value of the digital pressure sensing signal corresponding to a smallest minimum value of the second derivative is diastolic pressure.

The invention discloses a method for non-invasively measuring blood pressure. The method includes pressure detection, pulse wave oscillation and a blood pressure calculation process based on detected pressure and oscillated pulse wave. The blood pressure calculation process includes: calculating mean blood pressure according to oscillated pulse wave; segmenting blood pressure to be calculated according to the mean blood pressure; using corresponding preset signal feature templates to match each segment; and calculating blood pressure according to matched signal feature templates. The invention further discloses a device for non-invasively measuring blood pressure. By applying template matching to segments, approximation to real comparison objects is achieved, and accuracy of blood pressure calculation is improved.

The invention relates to a blood pressure real-time measurement device which comprises a first position pulse wave induction module, a second position pulse wave induction module and a signal processing module, wherein the first position pulse wave induction module comprises a first position first pulse wave induction module and a first position second pulse wave induction module; the second position pulse wave induction module comprises a second position first pulse wave induction module and a second position second pulse wave induction module; the signal processing module is used for calculating a first transmission signal difference delta tA between a first pulse wave signal A1 and a second pulse wave signal A2 of the first position and a second transmission signal difference delta tB between a first pulse wave signal B1 and a second pulse wave signal B2 of the second position, and obtaining mean blood pressure (MBP) of each cardiac cycle according to a difference delta t between the first transmission signal difference delta tA and the second transmission signal difference delta tB. The invention further relates to a method for measuring the mean blood pressure.

A blood pressure detection apparatus includes a pressure sensor (12), a press mechanism (10) that applies pressure to a blood vessel by pressing a living body, and can gradually decrease the pressure, and a blood pressure calculation section that determines the pressure when a given waveform pattern appears in a waveform of pulse waves obtained by the pressure sensor to be a maximal blood pressure, determines the pressure when the waveform has a maximum amplitude to be a mean blood pressure, and calculates a minimal blood pressure using the maximal blood pressure and the mean blood pressure.

A biological analysis device includes an average blood pressure calculation unit that calculates an average blood pressure index related to an average blood pressure of a biological body in accordance with a blood vessel diameter index related to a blood vessel diameter of the biological body and a blood flow index related to a blood flow of the biological body and calculated from an intensity spectrum related to a frequency of light reflected and received from an inside of the biological body through radiation of a laser beam.

A self-calibrating human blood pressure measurement method provided by the present invention comprises the following steps: collecting human blood pressure signals, and performing ADC sampling on the collected human blood pressure signals; performing system error elimination processing on the ADC sampling data; sampling according to the elimination of system errors The pulse wave envelope is formed by data fitting, and the average blood pressure of the human body and the inflection points on both sides of the peak of the pulse wave envelope are determined through the pulse wave envelope; The proportional coefficient between the amplitude and the amplitude of the pulse wave envelope corresponding to the average blood pressure of the human body; judge the position of the inflection point on both sides of the peak of the pulse wave envelope line, and according to the position of the inflection point and the pulse wave envelope corresponding to the systolic blood pressure and the diastolic blood pressure of the human body The proportional relationship between the amplitude of the curve and the amplitude of the pulse wave envelope corresponding to the average blood pressure of the human body determines the systolic blood pressure and the diastolic blood pressure of the human body; it can effectively eliminate the systematic error in the blood pressure sampling data; it reduces the difficulty of hardware design and the complexity of operation Degree, reduce product cost.

In a sphygmomanometer for measuring blood pressure according to a volume compensation method, an upper arm V0 equivalent cuff pressure representing a cuff pressure in a state where an inner pressure and an outer pressure of an artery of an upper arm are in equilibrium is specified based on a cuff pressure signal of the upper arm. For example, the upper arm V0 equivalent cuff pressure is detected as an average blood pressure obtained from the cuff pressure signal of the upper arm. After a control target value and an initial cuff pressure in the volume compensation are detected, a difference between the initial cuff pressure and the upper arm V0 equivalent cuff pressure is calculated as a correction value, and the blood pressure value in the volume compensation method is corrected with the calculated correction value.

An augmentation-index determining apparatus (10), including a cuff (12), a cuff-pressure changing device (16,18,24,50), a pulse-wave extracting device (28), means (54) for determining the times of occurrence of the peak points of the incident and reflected wave components during cuff-pressures higher than the systolic blood pressure, and lower than the mean blood pressure of the subject, and means (56) for determining an augmentation-index based on the magnitudes and times of occurrence of the determined peaks.

The invention provides a blood pressure detection method for extracting pulse waves based on videos and a terminal. The method comprises the steps that parameters of a nonlinear blood pressure calculation model are initialized; using a camera to shoot videos of neck and facial artery pulsation regions of the subject; amplifying a weak neck artery pulse signal and a weak facial artery pulse signal in the two regions by using a motion amplification technology; respectively selecting neck and facial artery pulsation point regions with obvious pulsation, and calculating to obtain pulse wave conduction time between the two point regions; a nonlinear blood pressure calculation model is adopted, and the average blood pressure value of the subject in the shooting time is obtained through calculation. According to the method, the neck and facial artery regions are collected through the camera, the pulse wave conduction time of the neck and facial artery pulsation points is obtained through signal amplification extraction and calculation, finally, the blood pressure value is obtained through calculation in combination with a nonlinear blood pressure calculation model, and non-invasive, non-contact and non-inductive blood pressure measurement is achieved while time delay errors are avoided.

A method of measuring the instantaneous arterial blood pressure and compliance and the device thereof are disclosed. The method identifies a critical depth under the skin. At this critical position, the arterial mean blood pressure is equivalent to the mean blood pressure obtained on the skin. The variation in the arterial mean blood pressure is tracked and controlled to maintain the equivalence between the mean blood pressure measured on the skin and the arterial mean blood pressure. In this case, the compliance of the muscle tissues remains invariant. Therefore, the variation measured on the skin is simply the behavior of the blood vessel. Using the skin-artery correlation, the invention can obtain the instantaneous blood pressure after some computation and the dynamic compliance at the critical position.

The embodiment of the invention relates to a method and device for predicting blood pressure based on synchronized signals. The method comprises the steps of acquiring PPG signal data and ECG signal data synchronized therewith; carrying out signal sampling processing on the PPG signal data and the ECG signal data separately according to a data sampling frequency threshold to generate a PPG one-dimensional data sequence and an ECG one-dimensional data sequence; carrying out blood pressure CNN input data fusion processing on the PPG one-dimensional data sequence and the ECG one-dimensional datasequence to generate an input data four-dimensional tensor; carrying out multilayer convolution pooling calculation by using a blood pressure CNN model according to a convolution layer number threshold to generate a feature data four-dimensional tensor; constructing a blood pressure ANN input data two-dimensional matrix; carrying out feature data regression calculation by using a blood pressure ANN model to generate a blood pressure regression data two-dimensional matrix; acquiring a prediction mode identifier; generating a mean blood pressure prediction data pair when the prediction mode identifier is mean prediction; and generating a dynamic blood pressure prediction one-dimensional data sequence when the prediction mode identifier is dynamic prediction.

The present invention discloses a method of predicting a blood pressure trend by blood pressure measurements, and the method allows users to select a number of times for measuring blood pressures as a cycle according to a doctor's recommendation or a personal preference, and automatically calculates and stores an average of blood pressures of the cycle (including systolic and diastolic blood pressures). With the variation of average blood pressures of previous and next cycles, users can know about the variation of the trends of their systolic and diastolic blood pressures quickly and easily. The trend of blood pressures is provided as a reference for users to adjust their living habits and for medical professionals to diagnose a patient's condition in hope of resuming the normal blood pressure of the patient.

The invention relates to a control target value automatic detection device based on a blood pressure beat-to-beat detection device and a detection method of the control target value automatic detection device and belongs to the field of blood pressure continuous detection of a radial artery. The invention solves the problems that an existing blood pressure detection device cannot detect a servo control target value at any time; due to reasons such as variation of vascular tone or position offset of an oversleeve, the variation of a target value is caused and the blood pressure cannot be continuously and accurately detected; and when a new target value is to be determined, system operation needs to be interrupted so as to cause fault and loss of important monitoring data. The control target value automatic detection device further comprises a wavelet filter and amplification module, a control target value I0 calculating module and a high frequency pressure wavelet generating module. When a control target value needs to be detected, a mean blood pressure signal output switch of a pressure output and calculation module is switched on, the high frequency pressure wavelet generating module generates a high frequency pressure wave which takes a mean blood pressure value as the center; the current control target value I0 is obtained by the control target value I0 calculating module; and the current control target value I0 is compared with PGdc which is detected in real time and the pressure of a cuff is regulated so as to obtain a pressure waveform and a blood pressure value at the moment. The control target value automatic detection device and the detection method thereof are used in the field of blood pressure detection.

The invention discloses an application of des-O-methyllasiodiplodin in preparation of a medicament for treating hypertension. Experimental studies show that the des-O-methyllasiodiplodin can well reduce caudal arterial blood pressure, central aortic systolic blood pressure, central aortic diastolic blood pressure, central aortic mean blood pressure and pulse wave velocity of spontaneously hypertensive rats (SHR), improve the artery elastic function, reduce the aortic media thickness and vascular wall collagen fibers and increase the inside diameters of blood vessels, and has a good effect of preventing and treating the hypertension. Obvious adverse response is avoided in the experimental process, and the des-O-methyllasiodiplodin is expected to be developed into a new-generation safe and effective medicament for preventing and treating the hypertension.

The present invention provides a sphygmomanometer system, including a measurement device pressed against a predetermined part to be measured so that the part to be measured is held down, and a blood pressure measurement device to measure blood pressure based on information from the measurement device. The measurement device includes an average blood pressure detection unit to obtain information on pressure applied to the measurement device, and a blood pressure change amount detection unit to detect a minute change of the part to be measured when the blood pressure change amount detection unit contacts with the part to be measured. The processor of the blood pressure measurement device calculates the average blood pressure, the highest blood pressure, and the lowest blood pressure based on information on pressure obtained from the blood pressure change amount detection unit and the average blood pressure detection unit.

The invention relates to a pressure measuring integrated external counterpulsation heart auxiliary device beside a main artery. The auxiliary device is formed by a hollow main body cavity placed extracorporeally, the main body cavity is composed of a first inner cavity and a second inner cavity, a diaphragm is arranged between the first inner cavity and the second inner cavity, the first inner cavity is provided with a valvula-less opening and coincides with the main artery through a rigid artificial blood vessel, and the second inner cavity is provided with an air inlet and an air outlet and connected with a gas driving device through a pipe. The auxiliary device has the advantages that pressure changes can be monitored synchronously, blood of the main artery is sucked into the auxiliary device during a systole period, systolic pressure is reduced obviously, afterload of the heart is reduced, and myocardial oxygen consumption is reduced; during a diastole period, the blood in the auxiliary device is led to a large vessel, mean blood pressure and diastolic blood pressure of the main artery are improved obviously, and perfusion of a coronary artery and other tissues is improved so as to achieve the goal of effectively assisting circulation.

Blood pressure measurements are represented aurally. An audio synthesizer (15) receives a signal representative of blood pressure information, and synthesizes an audio output from the signal. Both the duration and pitch of the synthesized audio output are dependent on the value of the blood pressure information, according to a linear scale or a non-linear scale such as stepped scale. The blood pressure information includes at least one of arterial or pulmonary arterial systolic, diastolic and mean blood pressure measurements, and the audio output includes an earcon comprising a tone or sequence of tones, the tone(s) being representative of a respective type of blood pressure measurement. The earcon may also include one or more static or dynamic beacons.

A method for issuing an alert which includes the following steps:—carry out an R analysis on two or more physiological variable inputs;—carry out an N analysis on a primary physiological variable input;—issue an alert if the R analysis confirms a trend for each of the physiological variable inputs and the N analysis shows a statistically significant change in the primary physiological variable input; where the two or more physiological variable inputs include systolic or mean blood pressure and pulse volume, and the primary physiological variable input is systolic or mean blood pressure; such that the alert is a visual, audio, vibratory, tactile or a combination of two or more of these or an alert signal to an output unit configured to output the alert in one of those forms.