Techniques for determining average value of an arterial blood pressure parameter of an examined subject are disclosed. A pressure device is used to apply changing pressure conditions over a body part of a subject and generate pressure measurement data indicative of the pressure applied. A first measuring unit measures blood-pressure-pulse related signals in the pressure-affected body part, and generate blood-pressure-pulse related measurement data indicative thereof, and a second measuring unit measures blood-pressure-pulse related signals in a pressure-free body part of the examined subject, and generate reference blood-pressure-pulse related measurement data indicative thereof. A control unit is used to operate the pressure device to apply the changing pressure conditions over the pressure-affected body part and simultaneously operate the first and second measuring units, determine an initial blood pressure parameter value of the subject based on the measurement data from the pressure device and from the first measuring unit, determine a correction factor based on the measurement data from the second measuring unit and from the first measuring unit, and determine the average blood pressure parameter of the examined subject based on the initial blood pressure parameter value and the correction factor.

To calibrate a differential pressure measurement to a geodetic height difference of (approximately) zero, a reference position determination part is led close up to the blood pressure measuring device where a calibration signal is triggered if a minimum distance is not reached between two respective points defined at the reference position determination part and a blood pressure measuring device. A control device integrated in or connected to the blood pressure measuring device performs the calibration measurement in response to the trigger signal. The triggering means are implemented, e.g., as an RFID tag on the reference position determination part-side and an associated near-field communication reader on the blood pressure measuring device-side. If the near-field communication reader detects the correctly encoded RFID tag in the reference position determination part, it triggers the calibration signal.

The invention relates to a measuring device for continuously determining the intra-arterial blood pressure in a finger of a hand, the measuring device comprises a base part and a cuff part. A light source for near-infrared light and a photodetector are provided for the finger. The light sources and the photodetectors are connected to an associated optical emission surface or optical collector surface via a respective so-called light pipe for coupling emitted light into the finger tissue or decoupling non-absorbed light from the finger tissue. The cuff-side and base-part-side sections of the light pipes are connected to one another via separable optical contact points at the interface between the cuff part and the base part. On the base-part side, a cover glass closes flush with the housing of the base part and is attached to the contact points.

A device (110), method and system (100) for calculating, estimating, or monitoring the blood pressure of a subject. At least one processor, when executing instructions, may perform one or more of the following operations. A first signal representing heart activity of the subject may be received. A second signal representing time-varying information on at least one pulse wave of the subject may be received. A first feature in the first signal may be identified. A second feature in the second signal may be identified. A pulse transit time based on a difference between the first feature and the second feature may be computed. The blood pressure of the subject may be calculated according to a first model based on the computed pulse transit time and a first set of calibration values, the first set of calibration values relating to the subject.

Disclosed herein is a base device with a pump device for applying pressure to a working fluid and a body contact device that can be detachably coupled to one another. A housing of the base device has a contact surface for the body contact device where the contact surface has a passage which can be closed by means of a closing member of a valve device. A spring is provided for applying spring force to move the closing member into a position that closes the passage. The body contact device has a pressure applicator, which can be acted upon by the working fluid, to apply pressure to the finger and a sealing element for creating a fluid connection with the base device. The body contact device has a deflecting means for deflecting the closing member against the spring force in the operating configuration.

Methods and systems for express estimation of the arterial elasticity in a subject are presented. The methods and systems provide simplicity in measurement and the opportunity to measure the arterial elasticity through HRV. The method includes imposing a rhythmical stimulation at a frequency between about 0.06 Hz and 0.081 Hz to cause an oscillation on the cardiovascular system of a subject. The method further include measuring a response associated with the oscillation on the cardiovascular system and determining the arterial elasticity of the subject based on a level of the response associated with the oscillation.

Devices and methods for non-invasive capillary blood pressure measurement are provided. An device can comprise a front end in contact with the body to compress and decompress the capillaries in the tissue, a pressure control module for regulating the contact pressure between the front end and the tissue, a pressure transducer coupled to the front end for measuring the contact pressure, a capillary sensing module for detecting the capillaries pulsations under the contact pressure modulation, and an algorithm for determining the capillaries pressures from the traces of capillary pulsation signals and the contact pressure signal. The methods include an oscillometric method for intermittent arterial and capillary blood pressure measurement and a volume-clamp method for continuous capillary blood pressure measurement.

An electronic device may a main body; a sensor part disposed on a side of the main body; and a processor configured to control a display to display a first graphical object related to a contact state of a finger based on information related to the contact state of the finger received from the sensor part before measurement of a bio-signal; and control the display to display a second graphical object related to a contact force of the finger based on information related to the contact force of the finger received from the sensor part during measurement of the bio-signal.

The invention relates to a method and an apparatus for validating a continuously measuring, non-invasive blood pressure measuring system equipped with a plethysmographic system capable of obtaining—in a measuring phase—a plethysmographic signal v(t) at an extremity, having a control mechanism to which the signal v(t) from the plethysmographic system is fed, which varies the contact pressure p.sub.C(t) at the extremity via a control value u(t), and having an evaluation unit which continuously determines the arterial blood pressure curve p.sub.A(t) based on the resulting contact pressure p.sub.C(t). According to the invention, the blood pressure measuring system has a coupling interface via which—in a validation or test phase—a signal derived from a previously recorded blood pressure curve can be input into the blood pressure measuring system.

A blood pressure measuring module is provided and includes at least one module body, at least one gas transportation device, at least one sensor. The module body is connected to an airbag, so as to control inflation and deflation operation of the airbag. The gas transportation device controls gas to flow. The sensor measures the variety of the gas pressure in the airbag or the pressure in contact with the user's skin. Gas transportation is formed as the gas transportation device is driven. The gas is guided into the module body and then is concentrated in the airbag, so that the airbag is inflated to perform the blood pressure measurement. The sensor measures the gas pressure accumulated in the airbag or the pressure in contact with the user's skin, and the user's blood pressure information is calculated.