42 results about "Cuff pressure" patented technology

The invention relates to the field of physiological signal detection, and discloses a blood pressure measurement system based on brachial artery cuff pressurization and finger PPG detection, which comprises a pressure control module, a PPG acquisition module and a central processing unit. The central processing unit is configured to extract a multi-dimensional PPG feature vector from the PPG signal in real time; dynamically adjusting the change mode of the cuff pressure applied by the pressure control module in a closed-loop manner based on the change of the PPG feature vector; constructing a dynamic response map based on the synchronously recorded cuff pressure and PPG feature vector; and determining a blood pressure value based on the overall analysis of the dynamic response map. Determining the blood pressure value specifically includes identifying a systematic distorted phase transition point in the atlas to determine systolic pressure. Through closed-loop adaptive excitation and global trajectory analysis, blood pressure determination is established on the basis of hemodynamic state transition, dependence on isolated event points is avoided, and measurement robustness and accuracy are improved.

This invention, which offers the advantage of an automatic repetitive blood pressure measurement that minimizes discomfort for the subject while continuously measuring blood pressure regardless of the subject's movement, thereby enhancing the reliability of the measurement results, which leads to the development of an automatic repetitive blood pressure measurement device and method for a smart blood pressure monitor, relates to blood pressure measurement technology, involving periodically repeating the inflation and deflation of a cuff a set number of times upon receiving a single operation signal input. The method includes the steps of detecting arterial wall vibrations when the cuff pressure is between the systolic and diastolic pressures of the artery during cuff inflation and deflation, recognizing the point where maximum vibration is detected as the systolic blood pressure based on the detection results, recognizing the diastolic blood pressure if the vibration decrease exceeds a threshold, and providing measurement results sequentially, including the recognized systolic and diastolic blood pressure values during the repeated inflation and deflation of the cuff a set number of times.

The embodiment of the invention provides equipment, a method and a device for measuring blood pressure based on a boosting process. The equipment comprises a cuff with an inflatable air bag, a pressure signal acquisition unit, a piezoelectric signal acquisition unit and a processor, the piezoelectric signal acquisition unit is arranged on the side, attached to the arm, of the cuff, and the pressure signal acquisition unit acquires pressure signals in the cuff in the air bag inflation stage when the equipment is used for measuring blood pressure; the piezoelectric signal acquisition unit is used for synchronously acquiring piezoelectric signals generated by brachial artery pulsation in an air bag inflation stage; and the processor is used for processing the piezoelectric signal to obtain the signal position of the effective Korotkoff sound signal, and obtaining a blood pressure measurement result based on the signal amplitude of the pressure signal at the signal position. In the blood pressure measurement process, the air bag can be inflated slowly and evenly, pressurization is stopped immediately when it is detected that the pressure reaches a target value, the use comfort of the device is improved, meanwhile, Korotkoff sound is accurately detected, and the blood pressure measurement accuracy is improved.

The present invention comprises a cuff (20), a cuff pressure adjustment unit (32, 33), and a pressure sensing unit (31) that senses cuff pressure. During a pressure release process, the time at which a waveform feature point of a pulse beat was generated for each pulse of a pulse wave indicated by an artery passing through a measurement target site is recorded. During the pressure release process, a memory (51) is caused to sequentially store, as a data pair, the time at which the waveform feature point of the pulse beat was generated and the cuff pressure at that time. The cuff pressure is displayed on an indicator (50).In the pressure release process, an observer listening for a Korotkoff sound with a stethoscope while observing the cuff pressure displayed on indicator (50) operates an operating unit (52B) and inputs a time signal indicating the time at which the observer judged that the generation of the Korotkoff sound had ceased. A data pair corresponding to one pulse beat preceding a data pair corresponding to the time is specified, and a cuff pressure contained within the specified data pair is recorded as a corrected diastolic blood pressure value.

A blood pressure measuring device includes: a cuff to be wrapped around a measurement target site; a pressure sensing unit configured to detect cuff pressure; a pressure control unit configured to control the cuff pressure; a blood pressure calculation unit configured to perform blood pressure calculation processing based on the cuff pressure;and a winding strength determination unit configured to perform winding strength determination processing to determine a winding strength of the cuff at the target measurement location, wherein the pressure control unit performs constant pressure control to maintain the cuff pressure at a constant target pressure value from the start of an increase in cuff pressure until the end of the winding strength determination processing, and performs constant rate pressurization control to increase the cuff pressure at a constant rate to calculate the blood pressure after completion of the winding strength determination processing, and wherein the winding strength determination unit determines the winding strength during the constant pressure control.

Various patient monitoring systems, devices, and methods are disclosed for monitoring physiological parameters of a patient. A noninvasive blood pressure monitor can include an inflatable cuff, a pressure transducer, an air pump, and a plurality of air paths connecting the inflatable cuff, the pressure transducer, and the air pump. The monitor can also include an acoustic filter provided along at least one of the air paths. In some cases, the monitor can include first and second air pumps, as well as a processor to independently control operating characteristics of the air pumps. The processor can also control the air pumps so as to provide a first inflation rate for the inflatable cuff during a non-measurement portion of an inflation phase and a second, higher inflation rate during a measurement portion of the inflation phase.

A blood purification device (10) comprises: a measurement unit (44) that uses a cuff (54) for pressurizing a blood vessel of a patient undergoing blood purification treatment to measure the patient's blood pressure values and the patient's pulse wave amplitude values corresponding to cuff pressures; and a prediction unit (50) that receives, as input, time-series data including the blood pressure values and the pulse wave amplitude values measured in the blood purification treatment, and outputs the patient's blood pressure prediction value.

The utility model relates to a tracheal catheter capable of monitoring air bag pressure, which comprises an air guide tube, an air bag sleeved outside the air guide tube, an inflation tube used for inflating and deflating the air bag and a pressure measuring device capable of monitoring the air bag pressure, and the pressure measuring device comprises a pressure indicating bag arranged outside the air bag and a liquid storage bag sleeved outside the pressure indicating bag. The pressure indication bag is communicated with the air bag through an inflation tube, and indication liquid used for displaying expansion and contraction changes of the pressure indication bag is arranged in the liquid storage bag. After the technical scheme is adopted, the liquid storage bag is arranged outside the air bag, the liquid storage bag is located outside the human body during use, safety is higher, risks caused by accidental leakage are avoided, the pressure indicating bag and the liquid storage bag are used for monitoring the pressure change of the air bag, simplicity and intuition are achieved, and even if the pressure change is small, the liquid storage bag can not be used. The liquid level sensor has the advantage of being convenient to monitor.

The invention relates to the field of intelligent wearing and blood pressure detection, in particular to a novel blood pressure detection method combining photoelectric pulse waves and a wrist cuff. The system comprises a wrist cuff, an air pump, a barometer, an analog-to-digital conversion module, a photoelectric pulse wave detection module, an MCU calculation unit, a display module and a cloud data module. The cuff pressurization process is started, and meanwhile photoelectric pulse wave detection is started, that is to say, blood pressure data in the cuff pressurization process can be obtained, and data of photoelectric pulse waves can also be obtained at the same time. Particularly, a photoelectric pulse wave detection module needs to be placed behind a cuff pressurization physical blocking line, and the purpose is to solve the problems that a wrist type cuff is small, pressurization saturation is fast, and once the volume of the cuff is full, the pressure value of the cuff is not in linear correlation. For people with hypertension, blood flow cannot be linearly blocked, a blood pressure value cannot be accurately calculated, photoelectric pulse wave data are increased to solve the problem that hypertension cannot be accurately measured due to the fact that a wrist cuff is small, and meanwhile the blood pressure measuring range of the wrist cuff is increased.

The invention relates to a blood pressure measuring method and device, computer equipment and a storage medium, and the method comprises the steps that a cuff pressurizing module is started, and an air pump assembly is used for inflating the cuff pressurizing module until the pressure of the cuff pressurizing module exceeds the systolic pressure of a measured person; in the process that the air pump assembly inflates the cuff pressurization module based on the preset inflation rate, cuff pressure data detected by the pressure sensor and PPG data collected by the PPG sensor module are obtained; and performing fusion calculation on the cuff pressure data and the PPG data by using a preset blood pressure calculation model to obtain a blood pressure measurement result. The blood pressure measuring precision and the air inflation rate can be improved, the measuring time is shortened, and then the problem that in the air inflation process, a measured person is pressed by the cuff for a long time, and consequently discomfort is caused can be solved.

The invention discloses a pneumatic pressurization control method and system for an electronic sphygmomanometer and a related device, which are used for improving the comfort of a tested person and the measurement safety and improving the measurement efficiency of a blood pressure measurement process on the whole. The method comprises the following steps: carrying out component separation on a photoelectric volume pulse wave signal to obtain a pulsation component reflecting the periodic change of arterial blood flow, and constructing an amplitude feature sequence updated along with a pressurization process; calculating the attenuation rate of the amplitude feature sequence relative to the reference sequence in the current pressure interval; constructing a nonlinear response trend model of the pulse amplitude to the pressurization process; whether the far-end artery blood flow enters a blocking critical state or not is judged in combination with a preset background noise base; if yes, the cuff is controlled to stop continuous pressurization, and the self-adaptive pressurization upper limit parameter measured this time is determined according to the cuff pressure at the corresponding moment; and controlling the sphygmomanometer to be switched from the pressurization control process to the deflation measurement process based on the self-adaptive pressurization upper limit parameter.

Provided is a sphygmomanometer capable of achieving high-precision blood pressure measurement even with a small amount of teacher data. This sphygmomanometer is provided with: a cuff wound around the arm of a person to be measured; a control unit for controlling the pressure of the cuff on the arm; a detection unit that detects a cuff pressure applied to the cuff from the arm; a measuring unit for measuring the blood pressure of the subject by oscillography using the time-series change in the cuff pressure; a correction model, which is constructed by machine learning for a plurality of subjects, and which has, as an explanatory variable, waveform information relating to a time-series change in the cuff pressure, and which has, as a target variable, an error in the blood pressure measured by the measurement unit with respect to the blood pressure used as a true value; a correction unit that corrects the blood pressure measured by the measurement unit on the basis of an error output by the correction model by inputting, to the correction model, the information of the waveform relating to the time-series change in the cuff pressure detected by the detection unit; and an output unit that outputs the blood pressure corrected by the correction unit.

A biological information measuring device includes: a blood pressure measuring section that measures blood pressure of a subject, the blood pressure measuring section having a cuff that compresses a measured site of the subject, a pump that supplies gas into the cuff, an exhaust valve that adjusts discharge of the gas from the cuff, a pressure detecting section that detects a cuff pressure as a pressure in the cuff, a cuff pressure control section that controls the pump and the exhaust valve, and a blood pressure operation section that calculates the blood pressure of the subject; an electrocardiogram measuring section that measures an electrocardiogram waveform by processing an electrical signal acquired by a plurality of electrodes, the plurality of electrodes including an electrode provided on a side of the measured site of the cuff and capable of contacting a skin of the subject; and an electrocardiogram storage section that stores information of the measured electrocardiogram waveform in association with time, the biological information measuring device including an interval specifying section that specifies an interval of the information of the electrocardiogram waveform from the information of the electrocardiogram waveform stored in the electrocardiogram storage section based on a progress of the measurement of the blood pressure of the subject in parallel with the measurement of the electrocardiogram waveform.

An endotracheal tube or tracheostomy tube with a cuff assembly comprises a cuff pressure regulator and a leak detection system. A pressure sensor monitors and measures the tracheal wall pressure and the pressure within the cuff assembly. When the measured value of the pressure sensor is abnormal, the cuff pressure adjustment process is initiated. The leak detection system detects air leakage from the seal between the cuff assembly and the tracheal wall. A scented film with a predetermined scent is placed on the lower portion of the cuff assembly distal to the seal with the tracheal wall. If a predetermined scent is detected in the air within the trachea proximal to the cuff assembly, it indicates an air leak. An air circulation device can generate an air flow within the trachea and sample and inspect a new batch of air. When an air leak is detected, the cuff pressure adjustment process is initiated.

The invention belongs to the technical field of hemostasis instruments, and provides a method for measuring blood vessel locking pressure by an orthopedic surgery hemostasis instrument, which comprises the following steps of: inflating a cuff wound on a limb until a blood vessel is completely locked, and controlling the cuff to release pressure at a constant speed, the pressure sensor and the independent pulse vibration sensor synchronously and independently collect a cuff pressure value and a pulse wave signal, the pulse wave signal is processed to obtain the trend that the amplitude of the pulse wave signal changes along with the pressure, and the amplitude is converted from a stable baseline state representing vascular atresia to the corresponding cuff pressure when the amplitude continuously rises for the first time. And the critical opening pressure of the blood vessel is accurately judged and is used as an individualized blood vessel locking pressure measurement value. The invention also discloses steps for carrying out hemostasis operation by using the method and a hemostasis instrument for realizing the method. The problem that in the prior art, measurement is not accurate due to the fact that pressure or pressure pulsation signals depend on experience is solved, and accurate measurement of the vascular locking pressure is achieved.

According to one aspect, there is provided a method of estimating the reliability of a cardiac output, CO, measurement obtained for a subject using an arterial waveform analysis, AWA, technique. The AWA technique is calibrated using a CO measurement obtained using a thermodilution CO measurement technique. The method comprises: (a) during a first time period in which a first CO measurement is obtained for the subject using the thermodilution CO measurement technique: (i) initiating (203) inflation of a cuff at a first location on the subject; (ii) obtaining (205) a first cuff pressure signal comprising measurements of pressure inside the cuff during inflation; (iii) analysing (207) the first cuff pressure signal to derive a relationship between oscillations in the volume of an artery under the cuff and pressure in the artery; and (iv) estimating (209) a first arterial compliance of the artery for a range of cuff pressures based on the determined relationship; (b) during a second time period after the first time period, repeating (211) steps (i)-(iv) to estimate a second arterial compliance of the artery; and (c) using (213) the results of a comparison of the first arterial compliance and the second arterial compliance to determine the reliability of a CO measurement obtained during the second time period using the AWA technique.

The invention relates to a multi-parameter analysis method integrated with arteriosclerosis assessment and a health monitoring system, and the method comprises the steps: determining a pressure oscillatory wave signal based on a cuff pressure signal through synchronously collecting the cuff pressure signal and electrocardiosignals and photoelectric volume pulse wave signals of two-side finger tips; calibrating a blood pressure analysis process of the pressure oscillatory wave signal based on a systolic pressure calibration reference determined by the photoelectric volume pulse wave signal, and determining a blood pressure value; calculating a vascular function evaluation result including the arteriosclerosis degree based on a heartbeat time sequence reference determined by the electrocardiosignal, the cuff pressure signal and the photoelectric volume pulse wave signal; performing multi-parameter correlation analysis on the blood oxygen signal and the electrocardiosignal extracted from the photoelectric volume pulse wave signal to obtain a multi-parameter analysis result; the blood pressure value, the blood vessel function evaluation result and the multi-parameter analysis result are integrated, and a comprehensive health evaluation report is generated; according to the invention, integration of multi-parameter acquisition, accurate calculation and deep analysis can be realized, and comprehensive and reliable health assessment support is provided.

The invention provides a medical inflation device. The medical inflation device comprises an air storage chamber, a constant pressure chamber, a pressure detection module and a plurality of airflow control modules. The air inlet end of the constant pressure chamber is connected with the air outlet end of the air storage chamber through a first controllable flow path, and the air outlet end of the constant pressure chamber is a cuff air supply outlet; the gas inlet end of the gas storage chamber is connected with various gas sources through a second controllable flow path; the air outlet end of the constant pressure chamber is also connected with external atmosphere through a third controllable flow path; airflow control modules are arranged on the first controllable flow path, the second controllable flow path and the third controllable flow path; the airflow control module is used for regulating and controlling airflow on-off and flow; the system has the functions of multi-gas-source redundancy, real-time detection and correction and gas safety guarantee, and the pressure of the cuff can be automatically adjusted in real time through pressure feedback.

The present disclosure relates to a method and corresponding system for a non-invasive determination of a physiological parameter, the method (400) comprising: applying (410) a first pressure cuff (150) to a limb of a living subject, in particular of a human being; applying (420) a second pressure cuff (104) distally to the first pressure cuff (150) to the limb of the subject; inflating (430) the first pressure cuff (150) to a pressure value exceeding a first threshold value; monitoring (440) a pressure signal of the second pressure cuff (104) after the step of inflating the first pressure cuff (150); deriving (450) a measure indicative of mean systemic filling pressure, MSFP, from the monitored pressure signal of the second pressure cuff (104).

A blood pressure measurement device includes a cuff to be wrapped around a measurement target site, a pressure detection unit configured to detect a cuff pressure, a pressure control unit configured to control the cuff pressure, a blood pressure calculation unit that calculates based on the cuff pressure, and a wrapping strength determination unit configured to determine a wrapping strength of the cuff, in which the pressure control unit performs a constant-pressure control to maintain the cuff pressure at a constant target pressure value from a start of an increase in the cuff pressure to an end of a wrapping strength determination processing, and performs a constant-speed pressurization control to increase the cuff pressure at a constant speed for calculating a blood pressure after the end of the wrapping strength determination processing, and the wrapping strength determination unit determines the wrapping strength during the constant-pressure control.

The invention provides a method, a device, a storage medium, a computer program product and an external defibrillation monitor for processing blood pressure measurement signals and blood pressure storage data. A method for processing a blood pressure measurement signal includes: determining a characteristic of each pulsation in a pressure measurement as a function of time; comparing the characteristics of the pulsations and determining a first number of consistent pulsations in the pressure measurements, the first number being greater than or equal to two, the difference between the characteristics of the consistent pulsations being less than a predetermined characteristic threshold; calculating a pulsation amplitude ratio between the average pulsation amplitude and a preceding average pulsation amplitude and comparing it to a predetermined pulsation amplitude ratio threshold; in response to the pulsation amplitude ratio being less than a pulsation amplitude ratio threshold, storing the cuff pressure value and an average pulsation amplitude; repeating the steps for each deflation; and calculating an average arterial pressure, systolic pressure, and diastolic pressure using the plurality of cuff pressure values and the plurality of average pulsation amplitudes for the successive deflation.

According to the non-invasive blood pressure estimation method based on multiple measurement pulse wave fusion, multiple cuff measurements are conducted on the same object, quality evaluation is conducted on the pulse wave oscillation sequence obtained through multiple measurements, all irregular oscillation waveforms are deleted, it is ensured that the reserved waveforms are regular waveforms, and the accuracy of blood pressure estimation is improved. All amplitude data are mapped to the same coordinate system through pressure values in the cuff pressure curve; due to the fact that all irregular waveforms are deleted, stable and high pulse wave amplitude data can be obtained after all reserved pulse wave segments are spliced, a unified oscillation envelope is formed by means of the overlapping performance of multiple pulse waves on a pressure axis, and then the blood pressure is obtained through the unified envelope.

Provided is a sphygmomanometer capable of measuring blood pressure with high accuracy as much as possible without performing data collection for parameter setting of a blood pressure measurement algorithm and calibration of measurement results. This sphygmomanometer is provided with: a cuff wound around the arm of a person to be measured; an inspection unit that inspects the cuff pressure received by the cuff from the arm; a decomposition unit that acquires, on the basis of the cuff pressure, a first waveform indicating a time-series change in a characteristic quantity relating to the blood pressure of the subject, and that decomposes the first waveform into a plurality of second waveforms indicating two or more different characteristic quantities; a learning model constructed by machine learning using the second waveforms for the plurality of subjects as explanatory variables and blood pressure measured by auscultation as target variables; a measurement unit that inputs the plurality of second waveforms into the learning model to measure the blood pressure of the subject; and an output unit that outputs the blood pressure measured by the measurement unit.

The invention discloses a double-channel fused high-precision blood pressure measurement device and a blood pressure value estimation method. The device comprises an air bag cuff, an air bag pressure sensor, an array type skin pressure sensor and a micro-processing unit, the air bag pressure sensor obtains air pressure data in the air bag, the array type skin pressure sensor obtains pulse pressure data, and the microprocessing unit is used for receiving the data and conducting fusion processing to obtain a final blood pressure estimation value. The skin pulse signal pressure sensing array is introduced on the basis of cuff pressure detection, local pulse waveforms can be directly collected, external noise interference is reduced, and signal stability is improved; besides, by means of double-channel fusion, air bag pressure signals and skin pulse array signals are combined, blood pressure estimation refers to cuff pressure changes and is combined with continuous pulse waveforms, adaptability to different individuals and high-precision blood pressure measurement are achieved, meanwhile, the recognition capacity of weak pulse signals is improved, and the measurement failure or error probability is reduced.

Blood pressure measuring device (1) which features: a cuff (40) which, when worn on a blood pressure measuring surface, pressurizes an artery in the measuring surface at the pressure of a fluid in the cuff; a piezoelectric pump (31) which increases the pressure inside the cuff (40); an air outlet unit (32) which reduces the pressure inside the cuff (40); a pressure detection unit (33) which detects the cuff pressure, which is the pressure inside the cuff (40); and a control unit (20), wherein the control unit (20) includes: a determining device which determines an amplitude and a frequency of a voltage which is applied to the piezoelectric pump (31) (step S112, step S113); a control device for the applied voltage, which performs the control so that a voltage at the amplitude and frequency determined by the determining device is applied to the piezoelectric pump (31) (step S114); and a blood pressure measuring device (1) which calculates a blood pressure value based on the cuff pressure detected by the pressure detection unit (33) during inflation when the cuff pressure is increased by the piezoelectric pump (31) (step S115), and wherein the determining device determines a first control frequency (fo1) as the first driving control frequency at which a pump efficiency of the piezoelectric pump is maximal in the case in which the fluid is supplied to the cuff (40) at a required flow velocity during inflation, using a previously determined first voltage (Vo1) as the voltage (step S112); wherein the determining device determines a second control voltage (Vo2) at which the pump efficiency is at its maximum, in the case in which the fluid is supplied to the cuff (40) at a required flow velocity during inflation, wherein a previously determined second frequency (fo2) is used as the second driving frequency (fo2) (step 113); The control device of the applied voltage performs a first control, which applies a voltage at the amplitude of the previously determined first voltage (Vo1) and at the first control frequency (fo1), which is determined by the determining device from the beginning of the inflation until a previously determined time, halfway through the inflation process, and The control device of the applied voltage performs a second control, which applies the previously determined second frequency (fo2) and the second control voltage (Vo2), which is determined by the control device, from the previously determined time until the end of the inflation (step S114).

The purpose of the present invention is to acquire blood pressure with high accuracy even if pulse waves contain noise. This sphygmomanometer is provided with: a cuff wound around the arm of a person to be measured; the control part is used for controlling the pressure of the cuff on the arm; a detection unit that detects a cuff pressure applied to the cuff from the arm; a generation unit that generates a first waveform image that includes a first image of a first pulse waveform that indicates a pressure change caused by pulsation of a blood flow flowing in the artery of the subject, and that indicates the cuff pressure by means of a feature amount of the first image, the first pulse waveform being acquired from a time-series change in the cuff pressure, and the first pulse waveform indicating a pressure change caused by pulsation of the blood flow flowing in the artery of the subject; and a calculation model that is constructed by machine learning that uses a second waveform image including a second image of a second pulse waveform as an explanatory variable and blood pressure of the subject as a target variable, and that shows the cuff pressure on the basis of a feature amount of the second image. The second pulse waveform is acquired from a time-series change with respect to the cuff pressure of the subject and shows a pressure change caused by pulsation of the blood flow flowing in the artery of the subject; and an acquisition unit that inputs the first waveform image into the calculation model and acquires the blood pressure of the subject from the calculation model.

The present application relates to the technical field of blood vessel health detection, and discloses a family blood vessel hardness and blood pressure combined detection method and system based on four-cuff pressure wave and finger clip dual-wavelength PPG fusion. The method collects pressure signals through synchronous inflation and deflation of four limb cuffs, and synchronously collects dual-wavelength PPG signals, pre-processes multi-channel signals, detects feature points, and aligns time, calculates blood pressure, ankle-brachial index and pulse wave velocity, and based on pulse wave velocity, ankle-brachial index and PPG waveform characteristics, weighted calculation or rule determination is carried out to obtain blood vessel hardness evaluation results. When the signal quality does not meet the preset condition, a retest prompt or a detection result with a confidence mark is output.

The application provides a non-invasive blood pressure waveform detection method and a blood pressure measuring device. A cuff is used to be bound on a subject's limb. An inflation device is communicated with the cuff through an air path to inflate the cuff. A deflation device is communicated with the cuff through an air path to deflate the cuff. A cuff pressure sensor is located on the communication air path between the inflation device and the deflation device and the cuff to detect the gas pressure in the cuff in real time and obtain a pressure oscillation waveform. A controller is electrically connected with the inflation device, the deflation device and the cuff pressure sensor. The controller controls the inflation device, the deflation device and the cuff pressure sensor to perform the inflation and deflation process on the cuff according to the non-invasive blood pressure waveform detection method and generate an envelope curve of blood pressure. The scheme shortens the cycle time of blood pressure measurement.

Systems and methods for measuring blood pressure. In some embodiments, the system includes a speckle plethysmography sensor and processing circuitry. The system may be configured to: perform blood flow measurements and measurements of cuff pressure of a subject using a speckle plethysmography sensor when the cuff pressure of a cuff worn by the subject changes; and calculating a first blood pressure from the blood flow measurement and the cuff pressure measurement.