BODY-WORN SYSTEM FOR CONTINUOUS, NONINVASIVE MEASUREMENT OF CARDIAC OUTPUT, STROKE VOLUME, CARDIAC POWER, AND BLOOD PRESSURE
First Claim
1. A system for simultaneously measuring blood pressure and at least one of stroke volume and cardiac output from a patient, comprising:
- an impedance sensor connected to at least two electrodes attached to the patient and comprising an impedance circuit, the impedance circuit configured to process signals from the at least two electrodes to measure an impedance signal from the patient;
an optical sensor connected to an optical probe attached to the patient and comprising an optical circuit, the optical circuit configured to process signals from the optical probe to measure at least one optical signal from the patient;
an ECG sensor connected to at least two electrodes attached to the patient and comprising an ECG circuit, the ECG circuit configured to process signals from the at least two electrodes to measure an ECG signal from the patient; and
,a processing system configured to;
i) operably connect to the impedance sensor, optical sensor, and the ECG sensor;
ii) receive the impedance signal from the impedance sensor and process it to determine a first value of at least one of stroke volume and cardiac output;
iii) receive the optical signal from the optical sensor and process it to determine a second value of at least one of stroke volume and cardiac output;
iv) receive the ECG signal from the ECG sensor and collectively process it and the optical signal to determine a blood pressure value; and
v) collectively process both the first and second values of at least one of stroke volume and cardiac output to determine a third value of at least one of stroke volume and cardiac output.
1 Assignment
0 Petitions
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.
54 Citations
24 Claims
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1. A system for simultaneously measuring blood pressure and at least one of stroke volume and cardiac output from a patient, comprising:
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an impedance sensor connected to at least two electrodes attached to the patient and comprising an impedance circuit, the impedance circuit configured to process signals from the at least two electrodes to measure an impedance signal from the patient; an optical sensor connected to an optical probe attached to the patient and comprising an optical circuit, the optical circuit configured to process signals from the optical probe to measure at least one optical signal from the patient; an ECG sensor connected to at least two electrodes attached to the patient and comprising an ECG circuit, the ECG circuit configured to process signals from the at least two electrodes to measure an ECG signal from the patient; and
,a processing system configured to;
i) operably connect to the impedance sensor, optical sensor, and the ECG sensor;
ii) receive the impedance signal from the impedance sensor and process it to determine a first value of at least one of stroke volume and cardiac output;
iii) receive the optical signal from the optical sensor and process it to determine a second value of at least one of stroke volume and cardiac output;
iv) receive the ECG signal from the ECG sensor and collectively process it and the optical signal to determine a blood pressure value; and
v) collectively process both the first and second values of at least one of stroke volume and cardiac output to determine a third value of at least one of stroke volume and cardiac output. - View Dependent Claims (7, 8, 9, 16, 17, 18)
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2. A system for simultaneously measuring blood pressure and at least one of stroke volume and cardiac output from a patient, comprising:
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an impedance sensor connected to at least two electrodes attached to the patient and comprising an impedance circuit, the impedance circuit configured to process signals from the at least two electrodes to measure an impedance signal from the patient; an optical sensor connected to an optical probe attached to the patient and comprising an optical circuit, the optical circuit configured to process signals from the optical probe to measure at least one optical signal from the patient; an ECG sensor connected to at least two electrodes attached to the patient and comprising an ECG circuit, the ECG circuit configured to process signals from the at least two electrodes to measure an ECG signal from the patient; and
,a processing system configured to;
i) operably connect to the impedance sensor, optical sensor, and the ECG sensor;
ii) receive the impedance signal from the impedance sensor and process it to determine a first value of at least one of stroke volume and cardiac output;
iii) receive the optical signal from the optical sensor and process it to determine a second value of at least one of stroke volume and cardiac output;
iv) receive the ECG signal from the ECG sensor and collectively process it and the impedance signal to determine a blood pressure value; and
v) collectively process both the first and second values of at least one of stroke volume and cardiac output to determine a third value of at least one of stroke volume and cardiac output. - View Dependent Claims (10, 11, 12, 19, 20, 21)
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3. A system for simultaneously measuring blood pressure and at least one of stroke volume and cardiac output from a patient, comprising:
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an impedance sensor connected to at least two electrodes attached to the patient and comprising an impedance circuit, the impedance circuit configured to process signals from the at least two electrodes to measure an impedance signal from the patient; an optical sensor connected to an optical probe attached to the patient and comprising an optical circuit, the optical circuit configured to process signals from the optical probe to measure at least one optical signal from the patient; and
,a processing system configured to;
i) operably connect to the impedance sensor and the optical sensor;
ii) receive the impedance signal from the impedance sensor and process it to determine a first value of at least one of stroke volume and cardiac output;
iii) receive the optical signal from the optical sensor and process it to determine a second value of at least one of stroke volume and cardiac output;
iv) collectively process the impedance signal and the optical signal to determine a blood pressure value; and
v) collectively process both the first and second values of at least one of stroke volume and cardiac output to determine a third value of at least one of stroke volume and cardiac output. - View Dependent Claims (13, 14, 15, 22, 23, 24)
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4. A system for determining a stroke volume and blood pressure value for a patient, comprising:
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a first sensor, configured to worn proximal to the patient'"'"'s brachium, comprising an impedance sensor; a second sensor, configured to be worn proximal the patient'"'"'s hand, comprising an optical sensor; a third sensor, configured to be worn proximal the patient'"'"'s thorax, comprising an ECG sensor; and a processing system, configured to be worn on the patient'"'"'s body and operably connect to the first, second, and third sensors, the processing system configured to determine the stroke volume by collectively processing time-domain properties of signals from both the first and second sensors, and the blood pressure value by collectively processing time-dependent properties of signals from at least two of the first, second, and third sensors.
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5. A system for determining a stroke volume and blood pressure value for a patient, comprising:
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a first sensor, configured to worn proximal to the patient'"'"'s brachium, comprising an impedance sensor; a second sensor, configured to be worn proximal the patient'"'"'s hand, comprising an optical sensor; a third sensor, configured to be worn proximal the patient'"'"'s thorax, comprising an ECG sensor; and a processing system, configured to be worn on the patient'"'"'s body and operably connect to the first, second, and third sensors, the processing configured to determine the blood pressure value by collectively processing time-dependent properties of signals from at least two of the first, second, and third sensors, and further configured to determine the stroke volume by collectively processing the blood pressure value and time-domain properties of signals from both the first and second sensors.
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6. A system for determining a stroke volume and blood pressure value for a patient, comprising:
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a first sensor, configured to worn proximal to the patient'"'"'s brachium, comprising an impedance sensor; a second sensor, configured to be worn proximal the patient'"'"'s hand, comprising an optical sensor; a third sensor, configured to be worn proximal the patient'"'"'s thorax, comprising an ECG sensor; and a processing system, configured to be worn on the patient'"'"'s body and operably connect to the first, second, and third sensors, the processing configured to determine the blood pressure value from a time delay determined between signals from at least two of the first, second, and third sensors, and further configured to determine the stroke volume by collectively processing the blood pressure value and time-domain properties of signals from both the first and second sensors.
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Specification