Body-worn system for continuous, noninvasive measurement of cardiac output, stroke volume, cardiac power, and blood pressure
First Claim
1. A system for measuring cardiac power from a patient, comprising:
- an electrocardiogram (ECG) module comprising;
i) at least two electrodes configured to be positioned on the patient'"'"'s torso;
ii) an ECG circuit configured to process signals from the at least two electrodes to measure at least one ECG waveform from the patient; and
iii) a first processing system configured to process the ECG waveform to determine a heart rate value;
an optical module comprising;
i) an optical probe configured to be positioned on a digit on a hand of the patient; and
ii) an optical circuit configured to process signals from the optical probe and to measure at least one photoplesthymograph (PPG) waveform from the patient;
a trans-brachial electrovelocimetry (TBEV) module comprising;
i) at least two TBEV electrodes;
ii) a TBEV circuit, configured to process TBEV signals from the at least two TBEV electrodes to measure a TBEV waveform from the patient; and
iii) a second processing system configured to process the TBEV waveform to determine a time dependent derivative of the TBEV waveform (d(TBEV)dZ/dt)), a first zero value in d(TBEV)dZ/dt indicating onset of a pulse in d(TBEV)dZ/dt representing opening of the patient'"'"'s aortic valve, a second zero value in d(TBEV)dZ/dt after onset of the pulse indicating closing of the patient'"'"'s aortic valve, a systolic flow time (SFT) calculated using the first zero value in d(TBEV)dZ/dt and the second zero value in d(TBEV)dZ/dt, a d(TBEV)dZ/dtmax value, and a stroke volume value calculated using the SFT and the d(TBEV)dZ/dtmax value;
a blood pressure module configured to;
i) receive the ECG waveform from the ECG module;
ii) receive the PPG waveform from the optical module;
iii) receive the TBEV waveform from the impedance module; and
iv) collectively process at least two of these waveforms to determine a blood pressure value;
a third processing system configured to be worn on the patient'"'"'s body, wherein the third processing system is configured to;
i) receive the ECG waveform from the ECG module;
ii) receive the TBEV waveform from the TBEV module;
iii) receive the PPG waveform from the optical module;
iii) collectively process at least two of these to determine a transit time value and a blood pressure value;
iv) receive the stroke volume value from the TBEV module;
v) receive the heart rate value from ECG module;
vi) receive the blood pressure value from the blood pressure module; and
vii) collectively process the stroke volume value, heart rate value, and blood pressure value to determine a cardiac power value; and
,wherein the third processing system comprises a wireless system, configured to transmit the stroke volume value, the cardiac output value, and the cardiac power value to a remote location.
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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.
466 Citations
9 Claims
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1. A system for measuring cardiac power from a patient, comprising:
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an electrocardiogram (ECG) module comprising;
i) at least two electrodes configured to be positioned on the patient'"'"'s torso;
ii) an ECG circuit configured to process signals from the at least two electrodes to measure at least one ECG waveform from the patient; and
iii) a first processing system configured to process the ECG waveform to determine a heart rate value;an optical module comprising;
i) an optical probe configured to be positioned on a digit on a hand of the patient; and
ii) an optical circuit configured to process signals from the optical probe and to measure at least one photoplesthymograph (PPG) waveform from the patient;a trans-brachial electrovelocimetry (TBEV) module comprising;
i) at least two TBEV electrodes;
ii) a TBEV circuit, configured to process TBEV signals from the at least two TBEV electrodes to measure a TBEV waveform from the patient; and
iii) a second processing system configured to process the TBEV waveform to determine a time dependent derivative of the TBEV waveform (d(TBEV)dZ/dt)), a first zero value in d(TBEV)dZ/dt indicating onset of a pulse in d(TBEV)dZ/dt representing opening of the patient'"'"'s aortic valve, a second zero value in d(TBEV)dZ/dt after onset of the pulse indicating closing of the patient'"'"'s aortic valve, a systolic flow time (SFT) calculated using the first zero value in d(TBEV)dZ/dt and the second zero value in d(TBEV)dZ/dt, a d(TBEV)dZ/dtmax value, and a stroke volume value calculated using the SFT and the d(TBEV)dZ/dtmax value;a blood pressure module configured to;
i) receive the ECG waveform from the ECG module;
ii) receive the PPG waveform from the optical module;
iii) receive the TBEV waveform from the impedance module; and
iv) collectively process at least two of these waveforms to determine a blood pressure value;a third processing system configured to be worn on the patient'"'"'s body, wherein the third processing system is configured to; i) receive the ECG waveform from the ECG module;
ii) receive the TBEV waveform from the TBEV module;
iii) receive the PPG waveform from the optical module;
iii) collectively process at least two of these to determine a transit time value and a blood pressure value;
iv) receive the stroke volume value from the TBEV module;
v) receive the heart rate value from ECG module;
vi) receive the blood pressure value from the blood pressure module; and
vii) collectively process the stroke volume value, heart rate value, and blood pressure value to determine a cardiac power value; and
,wherein the third processing system comprises a wireless system, configured to transmit the stroke volume value, the cardiac output value, and the cardiac power value to a remote location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification