A blood pressure monitoring system is for mounting around a body limb or digit, in which an array of electroactive material actuators provides an inward force. One or more electroactive material actuators are identified which are best located for performing blood pressure monitoring and these are then used to apply a pressure. By performing pulse monitoring while controlling the identified one or more electroactive material actuators, the blood pressure may be determined.

Method and systems are provided for reliable, convenient, self-administered, and cost-effective determination of central venous pressure. The noninvasive method and apparatus use changes in transmural pressure to create detectable changes in peripheral venous vascular volume for the determination of central venous pressure. Transmural pressure changes can be manifested by intravascular or extravascular pressure changes. The system is noninvasive and uses optical measurements of venous volume in the presence of transmural pressure changes. The relationship between the transmural pressure change and the change in vascular venous volume is combined with anatomical measurements to determine the central venous pressure of the subject. Central venous pressure can be used to determine hemodynamic status of the subject to include fluid overload in the heart failure patient.

The present disclosure generally relate s to blood pressure monitoring. In some embodiments, methods and devices for measuring a mean arterial pressure and/or for monitoring blood pressure changes of a user are provided. Blood pressure measured by one or more pressure sensors may be adjusted using one or more correction factors. The use of the one or more correction factors disclosed herein may allow for more compact, convenient, and/or accurate wearable blood pressure measurement devices and methods. In particular, wrist-worn devices may be provided which are less bulky than current devices and may facilitate more frequent and accurate blood pressure monitoring.

The method serves to determine at least one physiological parameter (P) of a patient. A pulse measurement signal of a pulse pressure wave propagating within the blood vessels and emanating from the heart is acquired at a pulse measurement point. A corrected pulse measurement signal is produced from the acquired pulse measurement signal by means of signal processing. The at least one physiological parameter is ascertained on the basis of the corrected pulse measurement signal. For the purposes of producing the corrected pulse measurement signal, the acquired pulse measurement signal is subjected to adaptive filtering with a dynamically adapting filter characteristic in order to compensate the influence of a reflected component of the pulse pressure wave.

One embodiment is a method comprising collecting photoplethysmography (PPG) data associated with a user using a biometric monitoring device; extracting a signal quality metric (SQM) from the collected PPG data; classifying the PPG data signal based on the extracted SQM into one of a plurality of signal quality levels; and determining based on the classification whether to increase, decrease, or maintain a power level of an LED of the biometric monitoring device.

A device, method and system for calculating, estimating, or monitoring the blood pressure of a subject. A first signal representing heart activity of a subject may be received. A plurality of second signals representing time-varying information on at least one pulse wave of the subject may be received from a plurality of body locations of the subject. A first feature of the first signal may be identified. For each of the plurality of second signals, a second feature may be identified. A pulse transit time based on a difference of the first feature and at least one of the second features may be computed. A blood pressure of the subject may be calculated according to a model based on the computed pulse transit time. The model may include a compensation term relating to the plurality of second signals or the second features thereof.

The present disclosure relates to a device, method and system for calculating, estimating, or monitoring the blood pressure of a subject based on physiological features and personalized models. At least one processor, when executing instructions, may perform one or more of the following operations. A first signal representing a pulse wave relating to heart activity of a subject may be received. A plurality of second signals representing time-varying information on a pulse wave of the subject may be received. A personalized model for the subject may be designated. Effective physiological features of the subject based on the plurality of second signals may be determined. A blood pressure of the subject based on the effective physiological features and the designated model for the subject may be calculated.

To easily and accurately acquire an electrocardiogram waveform in a device for simultaneously measuring blood pressure, an electrocardiogram, and other vital signs. A vital sign measurement device 100 is provided with a blood pressure measurement cuff 20 for pressing on a certain measurement part of a subject, one or a plurality of biosignal sensors 30, 40 for detecting a biosignal of a separate measurement part of the subject, a plurality of electrodes 51-54 for contacting the skin of the subject and detecting physical electrical potentials, and a device body 10. The device body 10 measures blood pressure of the subject by increasing and decreasing the cuff pressure in the cuff 20, measures vital signs other than the blood pressure and electrocardiogram of the subject on the basis of biosignals detected by the biosignal sensors 30, 40, and measures the electrocardiogram of the subject on the basis of the physical electrical potentials detected by the plurality of electrodes 51-54. At least one of the plurality of electrodes is provided to the cuff 20, and at least one of the plurality of electrodes is provided to the biosignal sensors 30, 40.

The invention relates to a method of operating a long-term blood pressure measurement device having a measurement sensor for detecting a pulse wave signal, having a measurement sensor for body current signals, having a pressure cuff for a non-invasive determination of the blood pressure, having a control and evaluation unit for determining blood pressure values, on the one hand from signals acquired by means of the pressure cuff (pressure cuff signals), and, on the other hand from a pulse wave transit time that is derived from body current signals and pulse wave signals, and having a memory for storing blood pressure values.

Disclosed is finger cuff that is connectable to a patient's finger to aid in measuring the patient's blood pressure. The finger cuff may comprise: a shell, a bladder, and a clamping mechanism. The shell may have a finger cavity. The finger cavity of the shell may be placed under a patient's finger to receive the patient's finger. Further, the finger cavity may include a light emitting diode (LED)photodiode (PD) pair. The bladder may include a pair of openings and the bladder may be mountable within the finger cavity such that the pair of openings surround the LED-PD pair, respectively. The clamping mechanism may be used to suitably clamp the patient's finger received in the finger cavity of the shell against the bladder mounted within the finger cavity of the shell.