摘要:
An electrode holding arrangement (100) for biosignal acquisition or stimulation, comprising: a piece of flexible material (20) adapted for being fixed to a certain body part; and at least one electrode spring element (30) created within the piece of flexible material (20) by cutting out a certain geometric profile (40) from said flexible material (20), and configured for, when the piece of flexible material (20) is fixed to a body part (97, 98) and an electrode (60) is attached to the at least one electrode spring element and is positioned on a body tissue surface (80A) so that it generates a force (FE) that makes the electrode spring element protrude outside the horizontal plane (H) of the plastic piece of flexible material, generating a force (FC) that presses the electrode (60) against the body tissue surface (80A).
摘要:
The present invention relates to an arrangement 100 for providing information about a flow rate of a fluid, comprising: a fluid inlet opening 111, at least one flow channel 112, and at least one porous zone 114 located above the flow channel, wherein the surface size and position of the at least one porous zone 114 relative to the fluid inlet opening 111 defines the evaporation rate of a fluid, arranged such that when a fluid is injected through the fluid inlet opening 111 it flows via hydraulic pressure through the at least one flow channel 112 and then through the respective at least one porous zone 114
摘要:
The present invention relates to methods and devices for gas sensing. According to the present invention, a gas sensor (100) comprises at least one sensing element (104), which in turn comprises at least an ionic liquid and at least one set of electrodes (101, 102) for polarizing the at least one sensing element (104). An electric power source (105) powers the at least two electrodes, thus generating an impedimetric response signal from the sensing element (104). Finally, a readout circuitry (106) separately analyzes the resistive and capacitive components in the impedimetric response signal, allowing multi-detection of different gasses and reducing cross-sensitivity.
摘要:
An All-Digital-Phase-Locked-Loop, ADPLL, arranged for generating a DCO output signal and a feedback loop comprising a set of components for controlling the DCO. The components comprising a Time-to-Digital Converter provided for performing phase detection within a predetermined observation window between a reference signal and an enable signal, a first subset of components arranged for generating the enable signal from the DCO output signal, and a second subset of components arranged for positioning the reference signal within the predetermined observation window. The first subset of components comprises a multiphase generator unit deriving from the DCO output signal a plurality of phase-shifted DCO copies and a phase selection unit for selecting on the basis of the phase setting control signal a DCO copy having an appropriate phase-shift for generating the enable signal. The DTC of the second subset of components has a reduced range with respect to that of the period of the multiphase generator output signals over at least part of the frequency range of the DCO.
摘要:
An electrode (100) for biopotential sensing comprising a main electrode base (1) and at least a first plurality of contact pins (2) protruding from that main electrode base and intended for making contact with a subject's skin. Each of said first plurality of contact pins (2) comprises at least one conductive mesh (3) having an elongated pillar shape. A headset or biopotential monitoring system comprising such an electrode for biopotential sensing.
摘要:
An electronic system (100) for estimating a subject's blood pressure, comprising: a feature extraction module (10) configured for receiving a subject's photoplethysmogram signal (PPG1), detecting a plurality of signal characteristic points on said received photoplethysmogram signal (PPG1), calculating a plurality of distances in both time and amplitude between any two of said detected photoplethysmogram signal characteristic points, and providing a feature information signal (FE) comprising information about said calculated distances; and a blood pressure calculation module (20) configured for receiving said photoplethysmogram signal (PPG1), said feature information signal (FE) and anthropometric characteristics (AC) of the subject, and the blood pressure calculation module (20) comprising a first estimation module (21) configured for calculating systolic and diastolic blood pressure values (SBP, DBP) of the subject based on said received feature information signal (FE) and anthropometric characteristics (AC), and a second estimation module (25) configured for calculating continuous mean blood pressure values (CMBP) of the subject based on said calculated systolic and diastolic blood pressure values (SBP, DBP) and said photoplethysmogram signal (PPG1); and wherein the first estimation module (21) uses a machine-learning regression model for calculating said systolic and diastolic blood pressure values (SBP, DBP) and the second estimation module (25) uses a Hilbert-Huang transform and an empirical mode decomposition process for calculating said continuous mean blood pressure values (CMBP).
摘要:
The present invention relates to a circuit (100) comprising - an input port for applying a sinusoidal input signal (1), - a first buffering means (10) for converting the sinusoidal input signal into a square wave signal (2), the DC level of the square wave signal defined by an adjustable threshold voltage level, and a - an output port for outputting the square wave signal to a power amplifier (30). The circuit is characterised by a feedback loop comprising a low pass filtering means (40) arranged for filtering the square wave signal and comparing means (50) arranged for comparing a DC level of a filtered signal received from the low pass filtering means with a pre-set reference level, said reference level selected for cancelling a given harmonic component, said comparing means further arranged for outputting to the first buffering means (10) a correction signal for adjusting the threshold voltage level of the first buffering means.
摘要:
The present invention relates to a buffering circuit (21) for buffering an oscillator signal. The buffering circuit comprises - a plurality of PMOS and NMOS transistor pairs connected in parallel, each pair having connected gate terminals and connected drain terminals forming an inverter circuit, each pair arranged for receiving via a direct coupling an oscillator signal at its gate terminal, each pair further being connected with an additional PMOS and NMOS transistor (P1, N1, P2, N2) - a control circuit (4) arranged for receiving an output signal output by said inverter circuits, for deriving information on the DC level of said output signal and for adjusting a voltage transfer curve expressing a relationship between a voltage at the input and output of said buffering circuit, by switching on or off said additional PMOS and NMOS transistors based on said derived information
摘要:
A biopotential signal acquisition system comprises: a first active electrode (10) comprising an integrated pre-amplifier (12) and an analogue to digital converter (14); a second active electrode (16) comprising an integrated preamplifier (18) and an analogue to digital converter (20), wherein the second active electrode has variable gain; a test signal generator (38) for generating a test signal at a test frequency and coupling the test signal to the first and/or second active electrodes (10,16); and a digital signal processor (30) adapted to: process the digital outputs (Vout_ref, Vout1) of the first and second active electrodes (10,16) to derive a gain control signal (D1) based on a difference between the first and second active electrode outputs (Vout_ref, Vout1) at the test frequency, and apply the gain control signal (D1) to the second active electrode (16).