BODY-WORN SYSTEM FOR CONTINUOUS, NONINVASIVE MEASUREMENT OF CARDIAC OUTPUT, STROKE VOLUME, CARDIAC POWER, AND BLOOD PRESSURE
First Claim
1. A method for determining cardiac power from a patient using a body-worn device, the method comprising:
- measuring an ECG waveform from a first portion on the patient'"'"'s body with an ECG module comprising;
i) at least two electrodes; and
ii) an ECG circuit configured to process signals from the at least two ECG electrodes to generate the ECG waveform;
measuring a trans-brachial electro-velocimetry (TBEV) waveform from a second portion on the patient'"'"'s body with an impedance module comprising;
i) at least two impedance electrodes; and
ii) an impedance circuit configured to process signals from the at least two impedance electrodes to generate the TBEV waveform;
measuring a photoplethysmograph (PPG) waveform from a third portion on the patient'"'"'s body with an optical module comprising;
i) an optical probe; and
ii) an optical circuit configured to process signals from the optical probe to generate the PPG waveform;
processing the TBEV waveform to determine a TBEV time-dependent component;
processing the TBEV waveform to determine a (dZ/dt)max value;
processing the PPG waveform to determine a PPG time-dependent component;
processing the ECG waveform to determine an ECG time-dependent component;
processing at least one of the ECG waveform, the TBEV waveform, and the PPG waveform to determine a heart rate value;
determining a SFT value by processing at least one of;
i) the PPG waveform;
ii) the TBEV waveform; and
iii) the ECG waveform;
determining a stroke volume value by processing SFT and the (dZ/dt)max value;
determining a blood pressure value by processing a transit time value determined from at least one of;
i) the PPG time-dependent component and the ECG time-dependent component;
ii) the TBEV time-dependent component and the PPG time-dependent component; and
iii) the ECG time-dependent component and the TBEV time-dependent component; and
collectively processing the blood pressure value, the stroke volume value, and the heart rate value to determine the cardiac power value.
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) 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. 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.
43 Citations
26 Claims
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1. A method for determining cardiac power from a patient using a body-worn device, the method comprising:
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measuring an ECG waveform from a first portion on the patient'"'"'s body with an ECG module comprising;
i) at least two electrodes; and
ii) an ECG circuit configured to process signals from the at least two ECG electrodes to generate the ECG waveform;measuring a trans-brachial electro-velocimetry (TBEV) waveform from a second portion on the patient'"'"'s body with an impedance module comprising;
i) at least two impedance electrodes; and
ii) an impedance circuit configured to process signals from the at least two impedance electrodes to generate the TBEV waveform;measuring a photoplethysmograph (PPG) waveform from a third portion on the patient'"'"'s body with an optical module comprising;
i) an optical probe; and
ii) an optical circuit configured to process signals from the optical probe to generate the PPG waveform;processing the TBEV waveform to determine a TBEV time-dependent component; processing the TBEV waveform to determine a (dZ/dt)max value; processing the PPG waveform to determine a PPG time-dependent component; processing the ECG waveform to determine an ECG time-dependent component; processing at least one of the ECG waveform, the TBEV waveform, and the PPG waveform to determine a heart rate value; determining a SFT value by processing at least one of;
i) the PPG waveform;
ii) the TBEV waveform; and
iii) the ECG waveform;determining a stroke volume value by processing SFT and the (dZ/dt)max value; determining a blood pressure value by processing a transit time value determined from at least one of;
i) the PPG time-dependent component and the ECG time-dependent component;
ii) the TBEV time-dependent component and the PPG time-dependent component; and
iii) the ECG time-dependent component and the TBEV time-dependent component; andcollectively processing the blood pressure value, the stroke volume value, and the heart rate value to determine the cardiac power value. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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2. A method for determining cardiac power from a patient using a body-worn device, the method comprising:
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measuring an ECG waveform from a patient'"'"'s chest with an ECG module comprising;
i) at least two electrodes; and
ii) an ECG circuit, the ECG circuit configured to process the ECG signal from the ECG electrodes;measuring an impedance waveform from a patient'"'"'s brachium with an impedance module comprising;
i) at least two impedance electrodes; and
ii) an impedance circuit, the impedance circuit configured to process the at least one impedance signal from the at least two impedance electrodes to generate the impedance waveform;measuring an optical signal from a patient'"'"'s hand with an optical module comprising;
i) an optical probe; and
ii) an optical circuit configured to process the optical signal from the optical probe to generator the PPG waveform;processing the TBEV waveform to determine a TBEV time-dependent component; processing the TBEV waveform to determine a (dZ/dt)max value; processing the PPG waveform to determine a PPG time-dependent component; processing the ECG waveform to determine an ECG time-dependent component; processing at least one of the ECG waveform, the TBEV waveform, and the PPG waveform to determine a heart rate value; determining a SFT value by processing at least one of;
i) the PPG waveform;
ii) the TBEV waveform; and
iii) the ECG waveform;determining a stroke volume value by processing the (dZ/dt)max value; determining a blood pressure value by processing a transit time value determined from at least one of;
i) PPG time-dependent component and ECG time-dependent component;
ii) TBEV time-dependent component and PPG time-dependent component; and
iii) ECG time-dependent component and TBEV time-dependent component; andcollectively processing the continuous blood pressure value, the stroke volume value, and the heart rate value to determine cardiac power value.
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3. A method for determining cardiac power from a patient using a body-worn device, the method comprising:
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measuring an ECG waveform from a first portion on the patient'"'"'s body with an ECG module comprising;
i) at least two electrodes; and
ii) an ECG circuit configured to process signals from the at least two ECG electrodes to generate the ECG waveform;measuring a trans-brachial electro-velocimetry (TBEV) waveform from a second portion on the patient'"'"'s body with an impedance module comprising;
i) at least two impedance electrodes; and
ii) an impedance circuit configured to process signals from the at least two impedance electrodes to generate the TBEV waveform;measuring a photoplethysmograph (PPG) waveform from a third portion on the patient'"'"'s body with an optical module comprising;
i) an optical probe; and
ii) an optical circuit configured to process signals from the optical probe to generate the PPG waveform;processing the TBEV waveform to determine a TBEV time-dependent component; processing the TBEV waveform to determine a (dZ/dt)max value; processing the PPG waveform to determine a PPG time-dependent component; processing the ECG waveform to determine an ECG time-dependent component; processing at least one of the ECG waveform, the TBEV waveform, and the PPG waveform to determine a heart rate value; determining a SFT value by processing at least one of;
i) the PPG waveform;
ii) the TBEV waveform; and
iii) the ECG waveform;determining a stroke volume value by processing SFT and the (dZ/dt)max value; estimating a pulse pressure value from the stroke volume value; determining a blood pressure value by processing the pulse pressure value and a transit time value determined from at least one of;
i) the PPG time-dependent component and the ECG time-dependent component;
ii) the TBEV time-dependent component and the PPG time-dependent component; and
iii) the ECG time-dependent component and the TBEV time-dependent component; andcollectively processing the blood pressure value, the stroke volume value, and the heart rate value to determine the cardiac power value.
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4. A system for determining cardiac power comprising:
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a body-worn system featuring separate circuit components, each worn on a unique portion of the body and configured to individually measure an impedance waveform, ECG waveform, and optical waveform; and
,a processing system configured to determine a stroke volume value from the impedance waveform and a blood pressure value from a transit time determined from at least two of the impedance, ECG, and optical waveforms, the processing system further configured to calculate cardiac power from the stroke volume and blood pressure values.
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5. A system for determining cardiac power comprising:
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a body-worn system featuring separate circuit components, each worn on a unique portion of the body and configured to individually measure an impedance waveform, ECG waveform, and optical waveform; and
,a processing system configured to determine a stroke volume value and pulse pressure value from the impedance waveform and a blood pressure value from the pulse pressure value and a transit time determined from at least two of the impedance, ECG, and optical waveforms, the processing system further configured to calculate cardiac power from the stroke volume and blood pressure values.
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6. A system for determining cardiac power comprising:
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a wrist-worn sensor for measuring an optical waveform, an arm-worn sensor for measuring an impedance waveform, and a chest-worn sensor for measuring an ECG waveform. a body-worn processing system configured to determine a stroke volume value from the impedance waveform and a blood pressure value from a transit time determined from at least two of the impedance, ECG, and optical waveforms, the processing system further configured to calculate cardiac power from the stroke volume and blood pressure values.
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7. A system for determining cardiac power comprising:
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a wrist-worn sensor for measuring an optical waveform, an arm-worn sensor for measuring an impedance waveform, and a chest-worn sensor for measuring an ECG waveform. a body-worn processing system configured to determine a stroke volume value and pulse pressure value from the impedance waveform and a blood pressure value from the pulse pressure value and a transit time determined from at least two of the impedance, ECG, and optical waveforms, the processing system further configured to calculate cardiac power from the stroke volume and blood pressure values.
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Specification