A device having an impedance measurement circuit that allows for reduction of flicker noise can be implemented in a variety of applications. A carrier suppression technique can be implemented that substantially removes the carrier signal with removal of noise artifacts associated with the carrier signal from sidebands of the carrier signal. Carrier suppression in an AC impedance measurement circuit can be implemented by sensing a carrier signal of the measurement circuit at a transmit location of the measurement circuit and subtracting a weighted version of the carrier signal at a receive location of the measurement circuit. One or more compensation impedances can be used such that the sidebands of the carrier signal are received with the carrier signal suppressed with respect to the receive location.

A method and system for multi-electrode monitoring of an internal electrical impendance of a biological object using placing two arrays of electrodes on opposite sides of the biological object, wherein each of said two arrays comprise at least two spaced apart electrodes; performing session of measurements comprising imposing and alternating electrical current between pairs of said electrodes and obtaining voltage signals representative of a voltage drop thereon; calculating values of skin-electrode resistance for all said electrodes; comparing said calculated values of skin-electrode resistance therebetween, wherein result of the comparison exceeding a predetermined threshold value being representative of a potential failure in at least one of said electrodes.

A method and system for multi-electrode monitoring of an internal electrical impendance of a biological object using placing two arrays of electrodes on opposite sides of the biological object, wherein each of said two arrays comprise at least two spaced apart electrodes; performing session of measurements comprising imposing and alternating electrical current between pairs of said electrodes and obtaining voltage signals representative of a voltage drop thereon; calculating values of skin-electrode resistance for all said electrodes; comparing said calculated values of skin-electrode resistance therebetween, wherein result of the comparison exceeding a predetermined threshold value being representative of a potential failure in at least one of said electrodes.

A system for monitoring blood pressure includes an implantable medical device (IMD) and an external device (ED). The IMD senses an electrogram (EGM) signal, identifies a feature thereof indicative of a ventricular depolarization, and transmits a conductive communication signal through patient tissue indicating when the ventricular depolarization occurred. The ED is worn against skin and configured to receive the conductive communication signal. The ED is also configured to sense a plethysmography (PG) signal and identify a feature thereof indicative of when a pulse wave responsive to the ventricular depolarization reaches a region of the patient adjacent the ED, and determine a delay time (TD) indicative of how long it takes the pulse wave to travel from the patient's heart to the region of the patient adjacent to the ED. The TD is a surrogate of the patient's blood pressure and useful for monitoring the patient's blood pressure and/or changes therein.

The present invention relates to an inductive plethysmography vest for a mammal having a mass less than 6 kg, comprising: a tube (10) made of elastic textile configured to surround the trunk of said mammal, said tube (10) extending along a longitudinal axis (X) parallel to the spinal column of said mammal; at least one inductive winding formed of a strand (20) of electrically conductive wire arranged in the form of wavelets along the circumference of said tube (10); said vest being characterised in that it comprises at least one strip (11) made of elastic textile, arranged along the circumference of the tube, defining a plurality of longitudinal loops (111), each wavelet being formed by the passage of the strand (20) of conductive wire successively in each loop (111).

The present invention relates to an inductive plethysmography vest for a mammal having a mass less than 6 kg, comprising: a tube (10) made of elastic textile configured to surround the trunk of said mammal, said tube (10) extending along a longitudinal axis (X) parallel to the spinal column of said mammal; at least one inductive winding formed of a strand (20) of electrically conductive wire arranged in the form of wavelets along the circumference of said tube (10); said vest being characterised in that it comprises at least one strip (11) made of elastic textile, arranged along the circumference of the tube, defining a plurality of longitudinal loops (111), each wavelet being formed by the passage of the strand (20) of conductive wire successively in each loop (111).

A contactless system for measuring and continuously monitoring arterial blood pressure includes a light source configured to illuminate light having at least one predetermined wavelength at a predetermined area of a human subject having an artery therein. A detector responsive to reflected light from the predetermined area to continuously acquire images of the artery in the predetermined area. A processor processes the images and determines when an image at a proximal location of the predetermined area is darker indicating transition of a pulse wave into the artery at the proximal location and at a proximal time and when an image at a distal location of the predetermined area is darker indicating transition of the pulse wave into the artery at a distal location at a distal time to contactlessly and continuously calculate the arterial blood pressure for each cardiac cycle of the human subject.

Provided is a blood pressure measurement system including a pulse wave measurement sensor unit that measures an arterial wave from an artery, and a blood pressure calculation unit that calculates blood pressure from an arterial wave detected by the pulse wave measurement sensor unit, and a blood pressure measurement method using the blood pressure measurement system. The pulse wave measurement sensor unit measures a first arterial wave under a constant pressure and measures a second arterial wave under a variable pressure, and the blood pressure calculation unit calculates a mapped arterial wave by mapping the first arterial wave measured under the constant pressure to the second arterial wave measured under the variable pressure and calculates blood pressure by using the mapped arterial wave.

A breathing monitor has ECG, PPG, or bioimpedance sensors feeding a neural network to provide inspiratory and expiratory phases of breathing and tidal volume (TV), filters for the inspiratory and expiratory phases of breathing and TV; and apparatus configured to provide measurements of breathing rate (RR), and fractional inspiratory time (FIT). In embodiments, the device uses the RR, FIT, and TV to estimate spirometric parameters such as lung obstruction severity, forced expiratory volume in one second (FEV1), forced expiratory volume (FEV), forced vital capacity (FVC), FEV1/FEV ratio, and FEV1/FVC ratio. A method of determining a classification of lung obstruction from heart signals includes feeding heart signals into a neural network to determine TV and inspiratory and expiratory classes used to determine FIT and RR; and using FIT, RR, and TV to determine lung obstruction classification of mild, moderate, severe, or very severe obstructive symptoms.

An aspect of the present invention is a consciousness disorder mitigation apparatus, including: a first estimation unit configured to estimate body fluid volume information, the body fluid volume information being information on a body fluid volume present in a head of a user; a second estimation unit configured to estimate oxygen supply volume information, the oxygen supply volume information being information on an oxygen supply volume representing an amount of oxygen in a brain of the user; a pressurization unit configured to be attached to the user and to apply a pressure corresponding to an estimation result of the first estimation unit and an estimation result of the second estimation unit; and an oxygen supply unit configured to supply oxygen to the user based on the estimation result of the second estimation unit.