Systems and methods using flexible capacitive electrodes for measuring biosignals
First Claim
1. A system for measuring biometric signals, the system comprising:
- a signal processor connected to a first electrode and to a second electrode, the signal processor being configured to process signals output from the first electrode and the second electrode, whereinthe first electrode is a capacitive electrode that includes a flexible conductive structure, andthe signal processor includes a signal isolator, the signal isolator being configured to isolate a low impedance signal and a high impedance signal from the signal output from at least one of the first electrode or the second electrode,wherein the system is configured to determine a respiratory effort of a subject, based on the low impedance signal, while determining a cardiac indication based on the high impedance signal and a voltage difference between the first electrode and the second electrode.
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Abstract
A system is provided for measuring biometric signals, including at least two electrodes, wherein at least one is a capacitive electrode with a flexible structure, the system having a circuit for measuring the voltage between the two electrodes, where in some embodiments both electrodes are capacitive electrodes, and can be arranged as flexible belts, the system being suitable for measuring ECG signals and can be configured to measure also respiratory effort with Respiratory Inductive Plethysmography (RIP) technology, using the same electrodes which are used for measuring capacitively the ECG signals, a method being further provided for measuring biosignals with the system of the invention, the method further including generating an added current signal with a signal generator connected to the circuit, where the added signal has a frequency substantially removed from the frequency of the biosignal of interest, and by measuring the voltage signal of the frequency component corresponding to the added current signal one can determine fluctuations in the overall impedance and fluctuations in the capacitance of the circuit, and correct for fluctuations in the capacitance to obtain a corrected voltage signal representing the measured biosignal.
29 Citations
19 Claims
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1. A system for measuring biometric signals, the system comprising:
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a signal processor connected to a first electrode and to a second electrode, the signal processor being configured to process signals output from the first electrode and the second electrode, wherein the first electrode is a capacitive electrode that includes a flexible conductive structure, and the signal processor includes a signal isolator, the signal isolator being configured to isolate a low impedance signal and a high impedance signal from the signal output from at least one of the first electrode or the second electrode, wherein the system is configured to determine a respiratory effort of a subject, based on the low impedance signal, while determining a cardiac indication based on the high impedance signal and a voltage difference between the first electrode and the second electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for measuring biosignals from a subject, the method comprising:
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placing a first electrode and a second electrode of a system on the subject, each of the first electrode and the second electrode being connected to a signal processor of the system, the signal processor being configured to process signals output from the first electrode and the second electrode; receiving the signals output from the first electrode and the second electrode; isolating a low impedance signal from a high impedance signal from the signal output from at least one of the first electrode or the second electrode; and determining a respiratory effort of the subject based on the low impedance signal while determining a cardiac indication based on the high impedance signal and a voltage difference between the first and the second electrode. - View Dependent Claims (19)
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Specification