BODY-WORN SYSTEM FOR CONTINUOUS, NONINVASIVE MEASUREMENT OF CARDIAC OUTPUT, STROKE VOLUME, CARDIAC POWER, AND BLOOD PRESSURE
First Claim
1. A method for measuring a time-dependent stroke volume (SV) value from a patient, comprising:
- measuring a time-dependent impedance waveform from the patient using a transbrachial electro-velocimetry (TBEV) sensor worn on the patient'"'"'s body;
measuring a time-dependent heart rate waveform from the patient using a heart rate sensor worn on the patient'"'"'s body;
receiving the time-dependent impedance waveform and the time-dependent heart rate waveform at a processing component, wherein the processing component recursively determines time-dependent SV values by (i) processing the time-dependent impedance waveform to determine a value of Z0 and a value of (dZ/dt)max, (ii) processing the time-dependent heart rate waveform to determine a value for systolic flow time (SFT); and
(iii) collectively processing the value of Zo, the value of (dZ/dt)max and the value of SFT to determine a SV value; and
displaying the time-dependent SV value on a display operably connected to the processing component.
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Accused Products
Abstract
The invention provides a system for measuring stroke volume (SV), cardiac output (CO), and cardiac power (CP) from a patient that features: 1) an impedance sensor connected to at least two body-worn electrodes and including an impedance circuit that processes analog signals from the electrodes to measure an impedance signal (e.g. a TBEV waveform); 2) an ECG sensor connected to at least two chest-worn electrodes and including an ECG circuit that processes analog signals from the electrodes to measure and ECG signal; 3) an optical sensor connected to a body-worn optical probe and including an optical circuit that processes signals from the probe to measure at least one optical signal (e.g. a PPG waveform) from the patient; 4) a processing system, typically worn on the patient'"'"'s wrist and connected through a wired interface to the optical sensor, and through either a wired or wireless interface to the TBEV and ECG sensors. The processing system analyzes the ECG, TBEV and optical signals to determine SV, and further analyzes SV and HR determined from an ECG sensor to determine CO.
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Citations
11 Claims
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1. A method for measuring a time-dependent stroke volume (SV) value from a patient, comprising:
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measuring a time-dependent impedance waveform from the patient using a transbrachial electro-velocimetry (TBEV) sensor worn on the patient'"'"'s body; measuring a time-dependent heart rate waveform from the patient using a heart rate sensor worn on the patient'"'"'s body; receiving the time-dependent impedance waveform and the time-dependent heart rate waveform at a processing component, wherein the processing component recursively determines time-dependent SV values by (i) processing the time-dependent impedance waveform to determine a value of Z0 and a value of (dZ/dt)max, (ii) processing the time-dependent heart rate waveform to determine a value for systolic flow time (SFT); and
(iii) collectively processing the value of Zo, the value of (dZ/dt)max and the value of SFT to determine a SV value; anddisplaying the time-dependent SV value on a display operably connected to the processing component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification