Method and Device for Non-Invasive Blood Pressure Measurement
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Abstract
A system for measuring blood pressure of a user that comprises an ElectroCardioGram (ECG) circuit with at least two ECG electrodes configured to obtain an electrical activity of a heart of the user by measuring the electrical signals detected at the at least two ECG electrodes as an electrocardiogram waveform, and a pulse oximeter circuit configured to obtain a pulse waveform corresponding to a blood flow on user'"'"'s vessels. The system further comprises a processor that is in electrical contact with the electrocardiogram circuit and the pulse oximeter circuit. The processor is configured to simultaneously analyze the electrocardiogram waveform and the pulse waveform. The processor is further configured to identify a “Zero Voltage Crossing” point on the electrocardiogram waveform and to determine time delays from this point to respective different determined points of the pulse waveform; and to use the time delays to compute the blood pressure values
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Citations
47 Claims
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1-25. -25. (canceled)
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26. A wrist-worn device for measuring blood pressure of a user, comprising:
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at least one of a back dial and a back side of a strap of the wrist-worn device configured to be in contact with an arm of the user on which the wrist-worn device is intended to be worn; an electrocardiogram (ECG) circuit with at least two electrodes, the ECG circuit configured to obtain an electrical activity of a heart of the user by measuring an ECG waveform detected by the at least two ECG electrodes; a pulse oximeter configured to obtain a pulse waveform corresponding to a blood flow in a blood vessel of the user; and a computing device configured to use the ECG waveform and the pulse waveform to compute blood pressure, wherein one or more of the at least two ECG electrodes is placed on at least one of the back dial and on the back side of the strap, and one or more of the at least two ECG electrodes is placed on a front side of the wrist-worn device or on a front side of the strap and is configured to be touched by the user, wherein the pulse oximeter includes an optical sensor operably connected to the pulse oximeter, the optical sensor being placed either on the at least one of the back dial and the back side of the strap, or on the front side of the device or on the front side of the strap in a proximity of the one or more of the at least two ECG electrodes, wherein the proximity is configured such that an intended touch by the user of the one or more of the at least two ECG electrodes causes the optical sensor to be touched simultaneously, and wherein the ECG circuit and the pulse oximeter are configured to simultaneously measure the ECG waveform and the pulse waveform.
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27. A system for measuring blood pressure of a user comprising:
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an electrocardiogram (ECG) circuit with at least two ECG electrodes configured to obtain an electrical activity of a heart of the user by measuring an ECG waveform detected at the at least two ECG electrodes; and a pulse oximeter configured to obtain a pulse waveform corresponding to a blood flow of a vessel of the user; and a processor that is in electrical contact with the ECG circuit and the pulse oximeter, wherein the processor is configured to simultaneously analyze the ECG waveform and the pulse waveform, and wherein the processor is further configured to identify a zero-voltage crossing point of the ECG waveform, to determine time delays from the zero-voltage crossing point to respective different determined points of the pulse waveform, and to use the time delays to compute blood pressure values of the user.
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28. A method for measuring blood pressure comprising steps of:
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analyzing an electrocardiogram (ECG) waveform and a pulse waveform obtained from an ECG circuit and a pulse oximeter, respectively; identifying a zero-voltage crossing point of the ECG waveform; determining time delays from the zero voltage crossing point to different determined points of the pulse waveform; and calculating the blood pressure based on a function of the time delays. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification