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, comprising:
- (a) measuring a motion waveform with a first motion sensor;
(b) processing the motion waveform with a motion algorithm to determine a motion-related parameter;
(c) comparing the motion-related parameter to a pre-determined threshold parameter to determine if the patient'"'"'s motion exceeds an acceptable level;
(d) measuring an impedance waveform from the patient with an impedance sensor if the patient'"'"'s motion does not exceed an acceptable level; and
(e) calculating a stroke volume value from the impedance waveform if the patient'"'"'s motion does not exceed an acceptable level.
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. 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
21 Claims
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1. A method for determining stroke volume from a patient, comprising:
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(a) measuring a motion waveform with a first motion sensor; (b) processing the motion waveform with a motion algorithm to determine a motion-related parameter; (c) comparing the motion-related parameter to a pre-determined threshold parameter to determine if the patient'"'"'s motion exceeds an acceptable level; (d) measuring an impedance waveform from the patient with an impedance sensor if the patient'"'"'s motion does not exceed an acceptable level; and (e) calculating a stroke volume value from the impedance waveform if the patient'"'"'s motion does not exceed an acceptable level. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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2. A method for determining stroke volume from a patient, comprising:
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(a) measuring a motion waveform with a first motion sensor; (b) processing the motion waveform with a motion algorithm to determine a motion-related parameter; (c) comparing the motion-related parameter to a pre-determined threshold parameter to determine if the patient'"'"'s motion exceeds an acceptable level; (d) measuring an impedance waveform from the patient with an impedance sensor; (e) calculating a stroke volume value from the impedance waveform; and (f) reporting the stroke volume value if the patient'"'"'s motion does not exceed an acceptable level.
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3. A method for generating an alarm from a stroke volume value calculated from a patient, comprising:
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(a) measuring a motion waveform with a first motion sensor; (b) processing the motion waveform with a motion algorithm to determine a motion-related parameter; (c) comparing the motion-related parameter to a pre-determined threshold parameter to determine if the patient'"'"'s motion exceeds an acceptable level; (d) measuring an impedance waveform from the patient with an impedance sensor; (e) calculating a stroke volume value from the impedance waveform; and (f) generating the alarm based on the stroke volume value if the patient'"'"'s motion does not exceed an acceptable level.
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4. A method for determining stroke volume from a patient, comprising:
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(a) measuring a motion waveform with a first motion sensor; (b) processing the motion waveform with a motion algorithm to determine a motion-related parameter; (c) processing the motion-related parameter to determine the patient'"'"'s posture; (d) measuring an impedance waveform from the patient with an impedance sensor; (e) calculating a stroke volume value from the impedance waveform and the patient'"'"'s posture.
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5. A method for generating an alarm from a stroke volume value calculated from a patient, comprising:
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(a) measuring a motion waveform with a first motion sensor; (b) processing the motion waveform with a motion algorithm to determine a motion-related parameter; (c) processing the motion-related parameter with an algorithm to determine the patient'"'"'s posture; (d) measuring an impedance waveform from the patient with an impedance sensor; (e) calculating a stroke volume value from the impedance waveform; and (f) generating the alarm based on the stroke volume value and the patient'"'"'s posture.
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Specification