Abstract: Sensor circuit device for measuring a bio-potential and/or a bio-impedance of a body, including a master circuit, and at least two active bi-electrodes connected to, and remotely powered by, the master circuit via single-wire first connector. The sensor circuit device further includes a single passive current electrode being connected to the master circuit via single-wire second connector. The sensor circuit device cooperates with a biological signal amplifier configured to measure a bio-potential and/or a bio-impedance. Each active bi-electrode is connectable to the biological signal amplifier via the first connector, such that a bio-potential of the body is measurable between the two active bi-electrodes when the active bi-electrodes and the single current electrode are in contact with a surface of the body.

Abstract: A sensor device for potential and/or impedance measurements on a body of a user, including a central electronic unit and at least a first sensor and a second sensor. Each sensor is connected to the central electronic unit by a one-wire connector. Each sensor includes a current electrode and a potential electrode destined to be in contact with a surface of the body. The master includes a master current source configured to circulate a master current in the one-wire connector, the current electrode of the at least first and second sensors and the body, when the sensors are in contact with a surface of the body. Each sensor includes a harvesting device configured to harvest energy from the circulating master current in a powering frequency band.

Abstract: A sensor for potential and/or impedance measurements on a body including at least one sensor connected to a master; the master including a power supply supplying a power signal transmitted to the at least one sensor; said at least one sensor including a first sensor fork sub-circuit configured to supply a positive current to a first circuit branch and a negative current to a second circuit branch; the at least one sensor further including a control circuit configured for controlling the positive and/or negative current in order to transmit an information signal to the master, and/or to control a first controlled signal to a first desired signal; and a second electrical connection connecting the at least one sensor to the master; the control circuit being further configured for harvesting energy from the alternating voltage supplied by the master to power the at least one sensor.

Abstract: A wearable measuring system configured for determining a blood pressure of a user, including: a first measuring unit including a PPG sensor, a first voltage measuring electrode and a first current injecting electrode; and a second measuring unit including a second voltage measuring electrode and a second current injecting electrode. The first measuring unit is removably attachable to a user's body first location such that a PPG signal can be measured by a PPG sensor at the first location, and the second measuring unit is removably attachable to a user's body second location, such that an ECG and an ICG signal can be measured between the first and second locations. The wearable measuring system further includes a signal processing module configured for processing the measured ECG, ICG and PPG signals to determine a blood pressure value.

Abstract: Measurement device for measuring a bio-impedance and/or a bio-potential of a human or animal body and adapted to be worn on the body, including: at least two electrode sensors. Each of the at least two electrode sensors includes a first electrical contact configured to be in electrical contact with the skin of the body when the system is worn, and a second electrical contact. A single electrical connector electrically connects the at least two electrode sensors with each other via the second electrical contact. An active device is configured to cooperate with a subset of the at least two electrode sensors such that the potential of the electrical connector is substantially equal to a projected potential determined from the potential of the first electrical contact of each electrode sensor of the subset when the measurement device is worn.

Abstract: Method for bio impedance measurement on a skin surface of a living body, using a bio impedance measurement device having a sensing electrode and a pilot electrode, includes the steps of placing the sensing electrode and pilot electrode on the surface of the body; providing a guard electrode adapted to separate the surface in at least two zones, among which a sensing zone including the sensing electrode and a current injection zone including the pilot electrode; providing a controller, electrically connected to the electrodes, adapted to control the current source; and controlling the potential of the guard electrode, at least at given stopping frequencies, in order to stop current from flowing from one zone to the other.

Abstract: Body electrode system including a set of standalone electrodes units for measuring physiological signals of a body part and/or electrically stimulate a body part. A connecting garment provides electrical connection between each standalone unit of the set. Each unit of the set is individually positionable at a specific chosen position onto the body to be sensed and/or stimulated. The garment is electrically connectable to said units, preferably after placement of said set onto the body.

Abstract: Measurement device for measuring a bio-impedance and/or a bio-potential of a human or animal body and adapted to be worn on the body, including: at least two electrode sensors. Each of the at least two electrode sensors includes a first electrical contact configured to be in electrical contact with the skin of the body when the system is worn, and a second electrical contact. A single electrical connector electrically connects the at least two electrode sensors with each other via the second electrical contact. An active device is configured to cooperate with a subset of the at least two electrode sensors such that the potential of the electrical connector is substantially equal to a projected potential determined from the potential of the first electrical contact of each electrode sensor of the subset when the measurement device is worn.

Abstract: Method for bio impedance measurement on a skin surface of a living body, using a bio impedance measurement device comprising a sensing electrode and a pilot electrode, comprising the following steps: placing said sensing electrode and pilot electrode on the surface of said body; providing a guard electrode adapted to separate the surface in at least two zones, among which a sensing zone including the sensing electrode and a current injection zone including the pilot electrode; providing a controller, electrically connected to said electrodes, adapted to control the current source; controlling the potential of said guard electrode, at least at given stopping frequencies, in order to stop current from flowing from one zone to the other.

Abstract: A follower amplifier with power supply biased by a controlled voltage source such that the power supply potentials are, for the frequencies of interest, as close as possible to the potential of the follower output. There is proposed a front-end electronic circuit for biopotential and impedance measurements with outstanding performances (very high input impedance and gain very close to unity). Preferably, the explicit guard electrode and the explicit electronic unit at the belt are no longer necessary; all electronics is embedded in units placed directly at the measurement sites. Moreover, the proposed front-end electronic circuit allows a drastic simplification of the cabling and connectors since all units are connected to only one wire (the theoretical minimum) for potential reference and current return. Preferably, this wire does not even require an electrical isolation and can be easily embedded in the textile of a shirt, in a garment, mesh, belt, etc.

Abstract: A physical gas sensor of thermal type capable of determining the concentrations of a gas mixture even in the presence of humidity by measuring the thermal diffusivity and conductivity includes a cell with thermal conductivity whose frequency response to the gases is known, in particular in respect of humidity, delivering a signal Vm representative of the concentration of the gas. This cell is excited by a pulsed signal so that a processing can be carried out at different analysis frequencies: at low frequency and at higher frequency. The output signals from the two processing chains are combined in the circuit (60) so as to provide the levels of concentration of the gas and the concentration of the water vapour. The signals obtained may also be re-combined together with components of the signal Vm of various passbands.

Abstract: In general, one aspect of the subject matter described in this specification features a torquer apparatus that includes a rotor with magnetic poles such that, when radially projected on a concentric octahedron, the same symmetrical pattern is obtained on all faces of the octahedron, the polarity of the poles projected on two adjacent faces of the octahedron being opposite. A stator with at least twenty poles magnetized with coils and such that, when radially projected on a concentric icosahedron, the same symmetrical pattern is obtained on all faces of the icosahedron, the stator being-in nominal position-concentric with the rotor. Real-time measurements, or equivalent information, of the position of the rotor with respect to the stator, and real-time measurements, or equivalent information, of exported torque from the stator, or of the orientation of the rotor with respect to the stator can be obtained.

Abstract: A follower amplifier with power supply biased by a controlled voltage source such that the power supply potentials are, for the frequencies of interest, as close as possible to the potential of the follower output. There is proposed a front-end electronic circuit for biopotential and impedance measurements with outstanding performances (very high input impedance and gain very close to unity). Preferably, the explicit guard electrode and the explicit electronic unit at the belt are no longer necessary; all electronics is embedded in units placed directly at the measurement sites. Moreover, the proposed front-end electronic circuit allows a drastic simplification of the cabling and connectors since all units are connected to only one wire (the theoretical minimum) for potential reference and current return. Preferably, this wire does not even require an electrical isolation and can be easily embedded in the textile of a shirt, in a garment, mesh, belt, etc.

Abstract: A physical gas sensor of thermal type capable of determining the concentrations of a gas mixture even in the presence of humidity by measuring the thermal diffusivity and conductivity includes a cell with thermal conductivity whose frequency response to the gases is known, in particular in respect of humidity, delivering a signal Vm representative of the concentration of the gas. This cell is excited by a pulsed signal so that a processing can be carried out at different analysis frequencies: at low frequency and at higher frequency. The output signals from the two processing chains are combined in the circuit (60) so as to provide the levels of concentration of the gas and the concentration of the water vapour. The signals obtained may also be re-combined together with components of the signal Vm of various passbands.

Abstract: A torquer apparatus generally comprises a reaction-gyro sphere consisting of a concentric assembly of a substantially spherical rotor and a substantially spherical stator. This is implemented in the present invention as a rotor with magnetic poles such that, when radially projected on a concentric octahedron, the same symmetrical pattern is obtained on all faces of said octahedron, the polarity of the poles projected on two adjacent faces of said octahedron being opposite and a stator with at least twenty poles magnetized with coils and such that, when radially projected on a concentric icosahedron, the same symmetrical pattern is obtained on all faces of said icosahedron, said stator being-in nominal position-concentric with said rotor. Real-time measurements, or equivalent information, of the position of the rotor with respect to the stator are obtained together with exported torque from the stator, or the orientation of the rotor with respect to the stator.

Abstract: The present invention concerns an optical based pulse oximetry device comprising: first, second and third light emitting means, for placement on the skin surface of a body part to inject light in a tissue of said part, the wavelengths of the light emitted by said second and third means being different from each other light detecting means located at a relatively short distance from said first light emitting means and at relatively long distance from said second light emitting means and said third light emitting means, for collecting at the skin surface light of said emitting means having travelled through said tissue, first computing means for denoising the output signals of said long distance light detecting means from the output signals of said short distance light detecting means, and second computing means for deriving oximetry measurements from the denoised output signals of said long distance light detecting means.