BODY-WORN SYSTEM FOR CONTINUOUS, NONINVASIVE MEASUREMENT OF CARDIAC OUTPUT, STROKE VOLUME, CARDIAC POWER, AND BLOOD PRESSURE
First Claim
1. A method for determining stroke volume from a patient using a body-worn monitor, comprising:
- (a) measuring an impedance signal with an impedance sensor operably connected to the body-worn monitor, the impedance sensor connected to at least two electrodes attached to the patient'"'"'s body and comprising an impedance circuit;
(b) measuring an optical signal with an optical sensor operably connected to the body-worn monitor, the optical sensor connected to an optical probe worn on the patient'"'"'s body and comprising an optical circuit;
(c) processing the impedance signal to determine a value of (dZ/dt)max;
(d) processing the optical signal to determine a value of SFT; and
(e) collectively processing (dZ/dt)max and SFT to determine the stroke volume.
1 Assignment
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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) 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.
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Citations
20 Claims
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1. A method for determining stroke volume from a patient using a body-worn monitor, comprising:
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(a) measuring an impedance signal with an impedance sensor operably connected to the body-worn monitor, the impedance sensor connected to at least two electrodes attached to the patient'"'"'s body and comprising an impedance circuit; (b) measuring an optical signal with an optical sensor operably connected to the body-worn monitor, the optical sensor connected to an optical probe worn on the patient'"'"'s body and comprising an optical circuit; (c) processing the impedance signal to determine a value of (dZ/dt)max; (d) processing the optical signal to determine a value of SFT; and (e) collectively processing (dZ/dt)max and SFT to determine the stroke volume. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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2. A method for determining cardiac output from a patient using a body-worn monitor, comprising:
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(a) measuring an impedance signal with an impedance sensor operably connected to the body-worn monitor, the impedance sensor connected to at least two electrodes attached to the patient'"'"'s body and comprising an impedance circuit; (b) measuring an optical signal with an optical sensor operably connected to the body-worn monitor, the optical sensor connected to an optical probe worn on the patient'"'"'s body and comprising an optical circuit; (c) measuring an ECG signal with an ECG sensor operably connected to the body-worn monitor, the ECG sensor connected to at least two electrodes attached to the patient'"'"'s body and comprising an ECG circuit; (d) processing the impedance signal to determine a value of (dZ/dt)max; (e) processing the optical signal to determine a value of SFT; (f) processing the ECG signal to determine a value of HR; and (g) collectively processing (dZ/dt)max, HR, and SFT to determine the cardiac output.
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3. A method for determining stroke volume from a patient using a body-worn monitor, comprising:
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(a) measuring a time-dependent impedance signal with an impedance sensor worn on the patient'"'"'s chest and operably connected to the body-worn monitor through a wireless interface, the impedance sensor connected to at least two electrodes attached proximal to the patient'"'"'s brachium and comprising an impedance circuit; (b) measuring a time-dependent optical signal with an optical sensor operably connected to the body-worn monitor through a wired interface, the optical sensor connected to an optical probe worn on one of the patient'"'"'s fingers and comprising an optical circuit; (c) processing the time-dependent impedance signal to determine a value of (dZ/dt)max; (d) processing the time-dependent optical signal to determine a value of SFT; and (e) collectively processing (dZ/dt)max and SFT to determine the stroke volume.
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4. A method for determining stroke volume from a patient using a body-worn monitor, comprising:
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(a) measuring an impedance signal with an impedance sensor operably connected to the body-worn monitor, the impedance sensor connected to at least two electrodes attached proximal to the patient'"'"'s brachium and comprising an impedance circuit; (b) measuring an ECG signal with an ECG sensor operably connected to the body-worn monitor, the ECG sensor connected to at least two electrodes attached to the patient'"'"'s body and comprising an ECG circuit; (c) processing the impedance signal to determine a value of (dZ/dt)max; (d) processing the ECG signal to determine a value of HR; (e) processing the HR to estimate a value of SFT; and (f) collectively processing (dZ/dt)max and the estimated value of SFT to determine the stroke volume.
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Specification