BODY-WORN MONITOR FOR MEASURING RESPIRATION RATE
First Claim
1. A system for monitoring a patient'"'"'s respiratory rate, comprising:
- a first sensor selected from the group consisting of;
i) an impedance pneumography sensor comprising at least two electrodes and an impedance pneumography processing circuit configured to process signals from the two electrodes to measure an impedance pneumography signal from the patient;
ii) an ECG sensor comprising at least two electrodes and an ECG processing circuit configured to process signals from the two electrodes to measure an ECG signal from the patient; and
iii) a PPG sensor comprising a light source, photodetector, and PPG processing circuit configured to process signals from the photodetector to measure a PPG signal from the patient;
a second sensor comprising a motion sensor configured to attach to the patient'"'"'s torso and measure a motion signal from the patient;
a processing system configured to be worn on the patient'"'"'s body and connect to the first sensor to receive a first signal representing at least one of the impedance pneumography, ECG, and PPG signals, and connect to the second sensor to receive a second signal representing the motion signal, the processing system configured to collectively process both the first and second signals to determine the patient'"'"'s respiration rate.
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Accused Products
Abstract
The invention provides a multi-sensor system that uses an algorithm based on adaptive filtering to monitor a patient'"'"'s respiratory rate. The system features a first sensor selected from the following group: i) an impedance pneumography sensor featuring at least two electrodes and a processing circuit configured to measure an impedance pneumography signal; ii) an ECG sensor featuring at least two electrodes and an ECG processing circuit configured to measure an ECG signal; and iii) a PPG sensor featuring a light source, photodetector, and PPG processing circuit configured to measure a PPG signal. Each of these sensors measures a time-dependent signal which is sensitive to respiratory rate and, during operation, is processed to determine an initial respiratory rate value. An adaptive digital filter is determined from the initial respiratory rate. The system features a second sensor (e.g. a digital 3-axis accelerometer) that attaches to the patient'"'"'s torso and measures an ACC signal indicating movement of the chest or abdomen that is also sensitive to respiratory rate. This second signal is processed with the adaptive filter to determine a final value for respiratory rate.
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Citations
21 Claims
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1. A system for monitoring a patient'"'"'s respiratory rate, comprising:
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a first sensor selected from the group consisting of;
i) an impedance pneumography sensor comprising at least two electrodes and an impedance pneumography processing circuit configured to process signals from the two electrodes to measure an impedance pneumography signal from the patient;
ii) an ECG sensor comprising at least two electrodes and an ECG processing circuit configured to process signals from the two electrodes to measure an ECG signal from the patient; and
iii) a PPG sensor comprising a light source, photodetector, and PPG processing circuit configured to process signals from the photodetector to measure a PPG signal from the patient;a second sensor comprising a motion sensor configured to attach to the patient'"'"'s torso and measure a motion signal from the patient; a processing system configured to be worn on the patient'"'"'s body and connect to the first sensor to receive a first signal representing at least one of the impedance pneumography, ECG, and PPG signals, and connect to the second sensor to receive a second signal representing the motion signal, the processing system configured to collectively process both the first and second signals to determine the patient'"'"'s respiration rate. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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2. A system for determining respiration rate values for a patient, comprising:
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a first sensor, configured to worn on the patient'"'"'s torso, comprising an impedance pneumography sensor; a second sensor, configured to be worn on the patient'"'"'s torso, comprising an accelerometer; a processing system, configured to be worn on the patient'"'"'s body and operably connect to the first and second sensors, the processing system configured to determine a respiration rate value by collectively processing signals from the first and second sensors.
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3. A system for determining respiration rate values for a patient, comprising:
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a first sensor, configured to worn on the patient'"'"'s torso, comprising at least one accelerometer for measuring a first signal representing movement of the patient'"'"'s torso due to respiratory events, and a second signal representing one of the patient'"'"'s posture and activity level; a processing system, configured to be worn on the patient'"'"'s body and operably connect to the first sensor, the processing system configured to process the first signal to determine a value for the patient'"'"'s respiratory rate, and the second signal to determine one of the patient'"'"'s posture and activity level, with the value for respiration rate reported by the system modified by one of the posture and activity level determined from the second signal.
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Specification