Abstract: An electronic sphygmomanometer has a causing unit that causes a constant volume change in a cuff and a causing processing unit for controlling a drive of the causing unit for a period for which a first pressure control (for example, depressurization control) is made so as to execute a process for giving a constant volume change to the cuff. Further, the electronic sphygmomanometer includes a measurement control unit that controls based on a cuff pressure signal measurement of a pulse wave amplitude and a pressure change property with respect to the volume change. The electronic sphygmomanometer includes a correction processing unit that corrects the measured pulse wave amplitude based on the measured pressure change property and a blood pressure calculating unit that calculates a blood pressure value based on the corrected pulse wave amplitude.

Abstract: The present invention relates a cardiovascular monitoring device including a first housing and a second housing, a circuitry with at least a processor, distributed in the first and second housings to form a first unit and a second unit, for providing functions of blood pressure and electrocardiogram measurements, an inflatable cuff connected with the first housing for being used during blood pressure measurement, and at least two electrodes, at least one of which is a dry electrode and mounted on the second housing for contacting the user's hand. The processor can detect an activation of the functions of blood pressure and electrocardiogram measurements, and based on a detecting result, trigger the device to enter different operation modes. The processor can further provide diastolic and systolic blood pressures when the blood pressure measurement function is activated, and provide a heart rhythm information when the electrocardiogram measurement function is activated.

Abstract: The present invention provides a method for estimating central aortic pulse pressure by cuff pressure pulse wave oscillation signals, comprising: (I) providing an equation for estimating central aortic pulse pressure; (II) measuring pressure pulse wave oscillation signals in a cuff, which comprise a brachial systolic blood pressure, a diastolic blood pressure and a waveform of the pressure pulse wave oscillation signals in the cuff; (III) averaging the waveform of the pressure pulse wave oscillation signals and calibrating the averaged waveform by the systolic blood pressure and diastolic blood pressure; (IV) analyzing the calibrated pressure pulse wave oscillation signal waveform to obtain a plurality predicting variables; and (V) obtaining an estimate of central aortic pulse pressure by values of predicting variables in step (IV) and the equation in step (I). The present invention further provides a device for estimating central aortic pulse pressure by the method of the present invention.

Abstract: An improved method and apparatus for non-invasively assessing one or more hemodynamic parameters associated with the circulatory system of a living organism. In one aspect, the invention comprises a method of measuring a hemodynamic parameter (e.g., arterial blood pressure) by applanating or compressing portions of tissue proximate to the blood vessel of concern until a desired condition is achieved, and then measuring the hemodynamic parameter. Such applanation effectively mitigates transfer and other losses created by the tissue proximate to the blood vessel, thereby facilitating accurate and robust tonometric measurement. An algorithm adapted to maintain optimal levels of applanation is also described. Methods and apparatus for scaling such hemodynamic parameter measurements based on subject physiology, and providing treatment to the subject based on the measured parameters, are also disclosed.

Abstract: A system and method prevents and diagnoses deep vein thrombosis in a body limb by providing a pressure sleeve having a plurality of individually fillable cells, the pressure sleeve being configurable to be placed around a body limb. A source fills each fillable cell individually, and a pressure sensor measures a pressure in a fillable cell. A controller establishes a fill sequence of each individually fillable cell and a fill time for each individually fillable cell. The controller causes a first individually fillable cell of the pressure sleeve to be filled to a predetermined pressure and causes the pressure of first individually fillable cell of the pressure sleeve to be measured while a second individually fillable cell of the pressure sleeve is filled. The controller determines a presence of deep vein thrombosis in a body limb having the pressure sleeve therearound based upon a measured pressure change in the first individually fillable cell of the pressure sleeve.

Abstract: Provided are a pressurizing module and a blood pressure measuring device including the pressurizing module. The pressurizing module includes a driving block optionally discharging compressed air; and a bellows-type airbag formed to overlap with the driving block, and comprising an inner space accommodating the compressed air discharged from the driving block, a plurality of wrinkles flattened so as to expand the inner space, and a pressurizing surface formed at an end portion of the wrinkles and spaced apart from the driving block as the inner space expands.

Abstract: A vascular testing system includes a first pressure cuff assembly positionable about a limb of a patient and a controller. The first pressure cuff assembly includes a pressure bladder and a first array of acoustic sensors, the first array including a plurality of acoustic sensor elements arranged circumferentially relative to the pressure bladder. The controller is configured to concurrently sense vascular data at two or more discrete testing locations utilizing at least two different sets of the acoustic sensors of the first array each positioned at or near one of the discrete testing locations. Each set of the acoustic sensors includes one or more of the plurality of acoustic sensor elements.

Abstract: A cuff of a pulse wave meter equipped with an arteriosclerosis degree judgment device has air bags for compressing a living body having a double structure along an artery including an avascularization air bag and a pulse-wave measuring air bag. Provided at outer circumferential sides of these air bags are a curler for integrally pressing these air bags against an upper arm, and an air bag for pressing the curler from the outer circumferential side. A member for suppressing vibrations is provided between a curler-compressing air bag and the pulse-wave measuring air bag, and suppresses propagation of vibrations from the curler-compressing air bag to the pulse-wave measuring air bag. The pulse wave meter measures a pulse wave based on changes in internal pressure in the pulse-wave measuring air bag while the avascularization air bag provides avascularization at the peripheral side.

Abstract: The present disclosure relates generally to patient monitoring systems and, more particularly, to signal analysis for patient monitoring systems. In one embodiment, a method of analyzing a detector signal of a physiological patient sensor includes obtaining the detector signal from the physiological patient sensor, and determining a ratio of the signal between two or more channels. A distribution of the angles between the points of the ratio over time may be used to determine a true ratio or a ratio of ratios for use in the determination of a physiological parameter.

Abstract: A system and method for non-invasively detecting intracranial pressure (ICP) of a living being by detecting impedance mismatches between carotid arteries and cerebral vessels via a reflection of the carotid pressure waveform using a pressure sensor positioned against the palpable carotid artery, as well as analyzing the reflection and comparing the analysis with known cerebral vasculature data, to calculate ICP non-invasively. A remote blood pressure waveform can also be used to compensate for blood system impedance.

Abstract: A method, system and computer program product are provided for evaluating whether an oscillometric signal representative of pressure oscillations in the vasculature of a patient is associated with special conditions that may lead to inadvertently identifying the signal as being indicative of peripheral arterial disease or non-analyzable. In one embodiment, the method includes obtaining an oscillometric signal at a location on an extremity of the patient, determining a ratio using a value associated with a first frequency component of the oscillometric signal and a value associated with a second frequency component of the oscillometric signal, comparing the ratio to a threshold value, associating a first diagnostic class with the oscillometric signal when a first outcome results from comparing the ratio to a threshold value, and associating a second diagnostic class with the oscillometric signal when a second outcome results from comparing the ratio to a threshold value.

Abstract: The present invention relates to a device and a method for estimating central systolic blood pressure based on oscillometric signals from brachial artery by the use of a pressure cuff.

Abstract: An electronic sphygmomanometer, which measures blood pressure in accordance with the volume compensation method, detects a cuff pressure inside a cuff attached to a measurement site of the blood pressure. An arterial volume detection circuit detects an arterial volume signal of the measurement site. A drive control unit, after setting the cuff pressure to an initial cuff pressure, servo-controls a cuff pressure adjustment unit so that a volume of an artery becomes constant, based on the detected arterial volume signal. While the servo control is being performed, an arterial volume change amount is detected based on the detected arterial volume signal.

Abstract: The present invention proposes a method and a device for long-term monitoring of the arterial vascular stiffness and vascular calcification on a particular patient, wherein a characteristic variable for the arterial vascular stiffness is determined exclusively from the shape and/or the characteristic of at least one pressure pulse wave caused by a cardiac contraction as a function of time and is stored as a time series for the particular patient. In particularly preferred embodiments, the characteristic variable is represented as a trend and serves the physician as a basis for long-term monitoring of the arterial vascular stiffness.

Abstract: A system for processing oscillometric data from a plurality of pressure steps to determine the blood pressure of a patient as disclosed herein. A heart rate monitor connected to the patient acquires the patient's heart rate. A time to frequency domain converter receives oscillometric data and converts the oscillometric data into the frequency domain. A harmonic frequency calculator is connected to the heart rate monitor and derives at least the heart rate fundamental frequency. A filter connected to the time to frequency domain converter and the harmonic frequency calculator that produces a filter frequency domain oscillometric signal. A reconstruction calculator receives the filtered frequency domain oscillometric signal and reconstructs a time domain oscillometric signal. A method of computing an oscillometric envelope for use in determining the blood pressure of a patient is also disclosed herein.

Abstract: A blood pressure measuring device disclosed in the present invention comprises a base, a reel-type cuff and at least one stopper. The reel-type cuff is elastically and recoverably reeled in the base with one end, and is freely extended out from the base with the other end. The stopper, after being operated, can limit at least one determined length that the reel-type cuff is extended out from the base.

Abstract: A device may include a vibration sensor configured to sense blood flow in a lumen of a person; a cuff coupled to the vibration sensor and configured to contact a limb of the person; a cuff pressurizer coupled to the cuff, the cuff pressurizer configured to adjust a compressive force of the cuff on the lumen; and an energy-generating apparatus coupled to the cuff, the energy-generating apparatus configured to generate energy from a depressurization of the cuff.

Abstract: Systems and methods for correlating diagnostic readings obtained by at least two medical devices can include a pressure offset correction parameter that is calculated for the purpose of correlating oscillometric blood pressure readings between a “home” blood pressure monitor and an “office” blood pressure monitor. The offset correction parameter is used to adjust blood pressure readings of the “home” or “office” blood pressure monitor such that these readings can be validly compared with blood pressure readings obtained using the other blood pressure monitor. In this manner, a more complete and reliable blood pressure trend may be developed and used for managing blood pressure related medical conditions.

Abstract: A device can include a vibration sensor configured to sense blood flow in a lumen of a person; a cuff coupled to the vibration sensor and configured to contact a limb of the person; a mechanical cuff tensioner coupled to the cuff, the mechanical cuff tensioner configured to adjust a compressive force of the cuff on the lumen; a tension sensor operably coupled to the mechanical cuff tensioner, the tension sensor configured to measure a first tension value of the cuff during a first sense by the vibration sensor and to measure a second tension value of the cuff during a second sense by the vibration sensor; and a recorder mechanism configured to record the first tension value, the first measurement by the vibration sensor, the second tension value, and the second measurement by the vibration sensor.

Abstract: Adaptive attachments used in combination with a blood pressure cuff enable various blood pressure measurements to be taken in a hospital or other setting having various single and/or dual lumen manual or electronic blood pressure measuring equipment with a single, patient-worn cuff.

Abstract: A medical device system and method that includes receiving an A2 heart sound signal from a first external acoustic sensor, receiving a P2 heart sound signal from a second external acoustic sensor, determining at least one A2 heart sound signal parameter from the A2 heart sound signal, determining at least one P2 heart sound signal parameter from the P2 heart sound signal, and based on the at least one P2 heart sound signal parameter, estimating pulmonary arterial pressure.

Abstract: A blood pressure measurement apparatus includes a blood pressure measurement unit, a bio-information acquisition unit, a depth calculation unit, a storage unit and a decision unit. The bio-information acquisition unit continuously acquires bio-information of a subject. The depth calculation unit repeatedly calculates depth indices each indicating a sleep stage of the subject on the basis of the acquired bio-information. The storage unit stores the calculated depth indices. The decision unit decides whether the sleep stage of the subject in sleep satisfies a starting condition, on the basis of a first depth index stored in the storage unit and a second depth index calculated by the depth calculation unit. The blood pressure measurement unit measures blood pressure data of the subject when the sleep stage is decided to satisfy the starting condition.

Abstract: A sphygmomanometer includes a central control unit having a pulse wave detecting section, a pulse wave amplitude calculation section, a pace change calculation section, and a pulse wave amplitude correction section. The pulse wave detecting section detects pulse waves, and the pulse wave amplitude calculation section calculates an amplitude of a pulse wave. The pace change calculation section calculates the amount of change of the increasing/decreasing pace of the cuff pressure between pulse waves based on the difference between the increasing/decreasing pace of the cuff pressure during a period of the pulse wave and the increasing/decreasing pace of the cuff pressure during a period of a preceding pulse wave. The pulse wave amplitude correction section corrects the amplitude of the pulse wave based on the amount of change of the increasing/decreasing pace of the cuff pressure. A blood pressure value is determined based on the corrected amplitude of the pulse wave.

Abstract: A CPU of a blood pressure information measurement device calculates blood pressure from a change in internal pressure of an air bladder used to measure the blood pressure. AI (augmentation index) and Tr (traveling time to reflected wave) are calculated from a pulse wave waveform. A path difference calculation unit of the CPU stores a correction equation to correct a pulse wave propagation distance that is stored in advance, and, by substituting the calculated blood pressure value, AI and the like into the correction equation, corrects the pulse wave propagation distance stored in advance and approximates the pulse wave propagation distance stored in advance to an actual pulse wave propagation distance. A PWV (pulse wave velocity) calculation unit calculates the PWV using the corrected distance.

Abstract: It is an object to provide a blood pressure monitor, wherein the noise caused by the friction of overlapping parts of a cuff can be inhibited during automatic elevation in the cuff pressure, and reliability in the automatic elevation of cuff pressure can be significantly enhanced. A cuff (1) is used in a blood pressure monitor to measure a blood pressure in a rolled condition where one end of the cuff (1) is wound within the other end thereof, wherein a cushion member (6) made of a raised fabric (61) is provided in at least one of surfaces at one end and the other end of the cuff (1) which rub against each other.

Abstract: A system for monitoring a patient includes an inflatable cuff configured to at least partially occlude an artery of the patient, and a sensor configured to determine a first parameter associated with the at least partially occluded artery and to generate an output signal indicative of the first parameter. The system also includes a processor configured to receive the output signal and information indicative of an occlusion efficiency of the cuff. The processor is configured to determine a hemodynamic parameter of the patient based on the output signal and the information.

Abstract: A battery-free electronic blood pressure measuring apparatus comprising a cuff (40), an airbag (22) to push air into the cuff (40), a power generation unit which has a generator (42) and an operating handle (28) coupled with the wall of the airbag (22) to generate electrical power, and a display device (44) to receive electrical power from the power generation unit, detect a blood pressure signal from the cuff (40), generate and display a blood pressure measurement. A method for electronically measuring blood pressure with a battery-free sphygmomanometer comprises pressing an airbag and a generator-driving structure attached to the airbag wall, which leads to electrical power generation and cuff inflation by the airbag at the same time, and measuring the blood pressure with the generated electrical power.

Abstract: The systems, devices, and methods described herein provide for the estimation and monitoring of cerebrovascular system properties and intracranial pressure (ICP) from one or more measurements or measured signals. These measured signals may include central or peripheral arterial blood pressure (ABP), and cerebral blood flow (CBF) or cerebral blood flow velocity (CBFV). The measured signals may be acquired noninvasively or minimally-invasively. The measured signals may be used to estimate parameters and variables of a computational model that is representative of the physiological relationships among the cerebral flows and pressures. The computational model may include at least one resistive element, at least one compliance element, and a representation of ICP.

Abstract: In device for side impact recognition in a vehicle, at least one pressure sensor system that produces a signal is provided in a side part of the vehicle, and an evaluation circuit is provided that recognizes a side impact as a function of the signal. In addition, a test device is provided for the at least one pressure sensor system, the at least one test device being configured such that the at least one test device oversamples the signal and then filters it in order to produce a test signal, the test device comparing the signal with a reference value and, as a function of this comparison, recognizing the operability of the at least one pressure sensor system.

Abstract: A blood pressure measuring method which can measure blood vessel elasticity, so that that the blood vessel elasticity can be commonly applied to all subjects, calculating pulse transit time at the time when no pressure is applied, calculating pulse transit time in an area where the pressure is changed by the cuff, and then calculating the elasticity of a blood vessel, using the pulse transit times.

Abstract: Apparatus, systems and methods are provided for analyzing relative compliance in the peripheral vasculature. Such apparatus, systems and methods generally involve generating a plethysmograph (PG) signal, generating one or more pressure waveforms and comparing the pressure waveform(s) relative to the PG signal to determine compliance indexes associated particular regions of the vasculature. A relative compliance ratio may also be determined by comparing arterial and venous relative compliance indexes. Apparatus, systems and methods are also provided for analyzing a PG waveform. Such apparatus, systems and methods generally involve generating a plethysmograph (PG) signal and comparing amplitude modulation of the PG signal relative to baseline modulation of the PG signal to estimate a relationship between left ventricular end diastolic pressure and stroke volume.

Abstract: A CPU of a blood pressure information measurement device calculates blood pressure from a change in internal pressure of an air bladder used to measure the blood pressure. AI (augmentation index) and Tr (traveling time to reflected wave) are calculated from a pulse wave waveform. A path difference calculation unit of the CPU stores a correction equation to correct a pulse wave propagation distance that is stored in advance, and, by substituting the calculated blood pressure value, AI and the like into the correction equation, corrects the pulse wave propagation distance stored in advance and approximates the pulse wave propagation distance stored in advance to an actual pulse wave propagation distance. A PWV (pulse wave velocity) calculation unit calculates the PWV using the corrected distance.

Abstract: A portable emergency medical device capable of communicating with a remote location preferably as a cellular telephone that can measure one or more human vital parameters such as pulse rate, body temperature, skin moisture, blood pressure, ECG or blood chemistry and can receive symptoms from a user either by voice recognition or by keypad and can provide an expert medical diagnosis. The device can store a complete medical history for one or more users and can use an expert system to make the diagnosis. The device can make an emergency medical call either on command or automatically requesting help and optionally supplying medical information and/or GPS location information.

Abstract: A method of deriving central aortic systolic pressure comprises (a) creating a set having a predetermined number of blood pressure measurements, the set representative of an arterial waveform; (b) determining an integer interval value; (c) averaging a series of consecutive blood pressure measurement readings in the set equal to the integer interval value commencing from the fth blood pressure measurement in the set; (d) storing the averaged value in a central aortic systolic pressure set; and (e) setting the central aortic systolic pressure as the highest value in the central aortic pressure set. Steps (c) and (d) are repeated with the value of f being incremented by 1 each time until the value of f plus the integer interval value equals the predetermined number of blood pressure measurements in the set.

Abstract: This invention describes a method for dividing a substantial cycli cardiovascular signal into segments by determining the characteristics of said cyclic signal, wherein each cycle in said signal comprises at least two characteristic segments and wherein the method comprises the steps o identifying segments in a cycle based on prior knowledge of said segment characteristics and the step of verifying said identified segments based on a number of statistical parameters obtained from prior knowledge relating to said cyclic signal. Furthermore, the invention describes a system adapted to perform the above-described method.

Abstract: In an ultrasound blood pressure monitor, a blood pressure diameter measurement section measures blood pressure diameter of a radial artery which is a measurement target based on reception results of ultrasound from an ultrasound sensor. In addition, a pressurizing section adds a pressure from a body surface so that the radial artery is pressed. Then, a correlation formula, which expresses a relationship between blood vessel diameter and blood pressure of the radial artery under pressurization by the pressurizing section, is found and stored in a storage section. Then, a blood pressure calculation section calculates blood pressure using the blood vessel diameter which is measured under pressurization and storage data in the storage section by controlling the pressurization operation of the pressurizing section.

Abstract: A method and apparatus is disclosed herein for monitoring vital signs using a health monitor embedded into a mobile device. In one embodiment, the apparatus comprises a mobile device having an embedded health monitor to take measurements of vital signs of an individual, to determine vital sign parameters from the measurements, and to transfer the vital sign parameters; and a computing system communicably coupled to the mobile device to store the vital sign parameters and to perform trend analysis on stored vital sign parameters and to provide feedback to the user or user specified persons and generate alarms.

Abstract: A blood pressure measurement device includes a measurement air bladder for being wrapped around a body part to be measured, a compression member that compresses the measurement air bladder from the outside of the measurement air bladder against the body part to be measured; an inflation member for inflating the measurement air bladder, a deflation member for deflating the measurement air bladder, a blood pressure determination unit that determines a blood pressure during the inflation by the inflation member or during the deflation by the deflation member, and a control unit that causes the compression member to apply a pressure that is higher than or equal to an atmospheric pressure to the measurement air bladder when an internal pressure of the measurement air bladder reaches or falls below a certain pressure due to the deflation by the deflation member.

Abstract: Method and apparatus for measuring a pulse transit time (PTT) value of a subject, comprising: measuring a first arterial pressure pulse arrival time (PAT) and measuring a second PAT value; calculating a PTT value from the difference between the first PAT value and the second PAT value; processing a sequence of electrical impedance tomography (EIT) images to identify at least one region of interest (ROI); and estimating at least one of the first and second PAT value from the variation of impedance value determined from said at least one ROI. The method allows for the non-invasive and continuous measurement of the PTT value and arterial blood pressures.

Abstract: An ABPI measurement system includes two cuffs for each ankle and two cuffs for each arm of a patient. Each cuff has chambers. The four cuffs are applied to each limb (or finger or toe), each chamber is inflated simultaneously to a pressure until a Pneumo Arterial Plethysmography (PAPG) signal related to the arterial flow in the limb is detected at the chambers. The chambers are then simultaneously inflated until the PAPG signals are extinguished in each limb, the inflation of chambers continuing for 10 mmHg to 20 mmHg above that pressure. The chambers are then deflated and the pressure at which the PAPG signal returns in the first chamber is recorded for each limb and this value of the pressure is used to calculate the ABPI. The ABPI is displayed or sent to a remote site.

Abstract: A high-accuracy blood pressure value deriving method that is hardly influenced by individual differences of a person to be measured is provided. A blood pressure measuring apparatus includes a cuff member comprising a compression air bladder, a sub air bladder, and a pulse wave detection air bladder, pressure control means for pressurizing or depressurizing each air bladder, a pressure sensor which senses the internal pressure of each air bladder, pulse wave signal extracting means for extracting time-series data of a pulse wave signal superposed on a cuff internal pressure, in the process during which the pressure control means pressurizes or depressurizes each air bladder, and blood pressure value deriving means for deriving a systolic blood pressure value and/or a diastolic blood pressure value based on a change in feature amount of the pulse wave signal and a cuff internal pressure at a point of time of the change.

Abstract: A blood pressure measuring apparatus includes a cuff member (2) which can be attached to and detached from a blood pressure measurement portion, and a cuff main body (1) including a compression air bladder (8) for pressing the blood pressure measurement portion, a sub air bladder (7), and a pulse wave detection air bladder (5). After pressurization is performed by compression air bladder pressurizing/depressurizing means (22, 23) and sub air bladder pressurizing/depressurizing means (27, 26), depressurization is controlled at the same depressurization rate, thereby reducing the cuff-edge effect and obtaining a pulse wave signal.

Abstract: Improved tourniquet apparatus for measuring a patient's limb occlusion pressure includes an inflatable tourniquet cuff for encircling a limb at a location and to which a tourniquet instrument is releasably connectable.

Abstract: To provide a non-invasive blood pressure estimation apparatus, which can accurately estimate systolic blood pressure from blood flow sound of a dialysis patient and continuously estimate systolic blood pressure by continuously picking up the blood flow sound. A blood pressure estimation apparatus creates a standard pulse curve by relating a start point and end point of a rising phase of a pulse wave to diastolic blood pressure and systolic blood pressure, respectively, creates a correspondence curve between blood flow sound power and estimated blood pressure by contrasting the standard pulse curve with the blood flow sound power curve obtained from blood flow sound at a shut site, with the two curves plotted on the same time axis, derives a systolic blood pressure estimation linear function from the correspondence curve, inputs a measured maximum value of the blood flow sound power into the linear function, and thereby estimates systolic blood pressure.

Abstract: A device for non-invasive measurement of blood pressure includes a blood pressure cuff, a plethysmographic electrode for acquiring an impedance plethysmogram distal to the cuff and a processing device to inflate and deflate the cuff, generate the impedance plethysmogram and to determine the systolic and diastolic blood pressures. It is determined when the cuff is completely occluding the extremity, e.g., by detecting pulses at a second, partially occluded cuff or by a photoplethysmogram attached to the big toe. The device can be used to measure systolic or diastolic blood pressure or both. It can also be used to take ankle-brachial measurements. An autocorrelation technique can be used to correct noise.

Abstract: A sphygmomanometer cuff is provided for measuring the blood pressure over a blood vessel. The sphygmomanometer cuff has at least one inflatable cuff part (3), which can be filled with a fluid for exerting pressure on the blood vessel, wherein the inflatable cuff part (3) has different widths at at least two points (I, II) along its longitudinal direction.

Abstract: A vital sign measurement device includes a sensor fixation device, an optical sensing system, and an output unit. The sensor fixation device is adapted to be placed against an anatomical location of a subject, within which is an artery. The optical sensing system includes an optical source device and an optical detector, both of which are held by the sensor fixation device and move with movement of the sensor fixation device. The optical source device is configured to produce a speckle pattern output. The optical detector is positioned to detect at least a portion of the speckle pattern output and generate therefrom the detected portion of the speckle pattern output. The optical sensing system can sense an arterial pulse from the movement, bending, or compression of at least one portion of the optical sensing system relative to other portions of the optical sensing system resulting in a change in the optical signal received within the detected portion of the speckle pattern output.

Abstract: A system and method of digital control for a blood pressure measurement system is provided. According to at least one embodiment, a photo-plethysmographic (PPG) system produces a frequency signal that corresponds to the measured light in the PPG system. Such light may be indicative of blood volume in a vein or artery. The frequency signal may be used to control one or more pressure valves of the system in order to measure blood pressure and hold the frequency signal constant.

Abstract: This invention provides a method and device for inflating a cuff of a non-invasive blood pressure measurement apparatus. The method comprises: obtaining a plurality of pressure values of the cuff at a plurality of time points; calculating a first inflation speed parameter on the basis of the plurality of pressure values, a plurality of target pressure values of the cuff at the plurality of time points and a plurality of inflation speed parameters corresponding to each time interval between every two adjacent time points of the plurality of time points; and inflating the cuff at a speed corresponding to the first inflation speed parameter from a last time point of the plurality of time points to a first time point after the plurality of time points. In this way, uniform cuff inflation can be achieved when the target pressure values of the cuff change uniformly, so that the over-voltage phenomenon or the condition of low-speed cuff inflation can be reduced or eliminated.

Abstract: Apparatus and a calibration method for measurement of blood pressure are used to determine personal PIP's for a given subject and to store the personal PIP's for future personal use in blood pressure measurement in the subject. The apparatus comprises at least one button communicating with a MPU unit for entering information used to determine the personal PIP's of the subject. The method comprises the steps of obtaining information required to determining the PIP's of a subject, determining the personal PIP's of the subject, and storing the personal PIP's of the subject for future personal use for the subject.