BODY-WORN MONITOR FOR MEASURING RESPIRATION RATE
First Claim
1. A system for monitoring respiratory rate from a patient, comprising:
- a cable comprising;
an impedance pneumography system comprising;
i) a connecting portion configured to connect to a plurality of electrodes configured to be worn on the patient;
ii) a differential amplifier configured to receive electrical signals from each of the plurality of electrodes and process them to generate an analog impedance pneumography signal; and
iii) an analog-to-digital converter configured to convert the analog impedance pneumography signal into a digital impedance pneumography signal;
an accelerometer system comprising;
i) an accelerometer configured to generate an analog motion signal; and
ii) analog-to-digital converter configured to convert the analog motion signal into a digital motion signal; and
a processing system comprising a processor in electrical communication with the cable and configured to receive the digital data stream and collectively process the digital impedance pneumography and motion signals to determine the patient'"'"'s respiratory rate.
2 Assignments
0 Petitions
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.
264 Citations
18 Claims
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1. A system for monitoring respiratory rate from a patient, comprising:
a cable comprising; an impedance pneumography system comprising;
i) a connecting portion configured to connect to a plurality of electrodes configured to be worn on the patient;
ii) a differential amplifier configured to receive electrical signals from each of the plurality of electrodes and process them to generate an analog impedance pneumography signal; and
iii) an analog-to-digital converter configured to convert the analog impedance pneumography signal into a digital impedance pneumography signal;an accelerometer system comprising;
i) an accelerometer configured to generate an analog motion signal; and
ii) analog-to-digital converter configured to convert the analog motion signal into a digital motion signal; anda processing system comprising a processor in electrical communication with the cable and configured to receive the digital data stream and collectively process the digital impedance pneumography and motion signals to determine the patient'"'"'s respiratory rate. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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2. A system for monitoring respiratory rate from a patient, comprising:
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a processing system configured to be worn on a patient'"'"'s body comprising a processor configured to receive a digital data stream from a cable comprising a motion sensor and an impedance pneumography sensor, and collectively process motion signals and respiratory signals in the digital data stream to determine respiratory rate; and
,a cable comprising the motion sensor and the impedance pneumography sensor, each sensor comprising an analog-to-digital converter configured to generate a digital signal, and a transceiver component configured to transmit the digital data stream through the cable and to an external system.
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Specification