Acoustic respiratory monitoring sensor with probe-off detection
First Claim
1. A method of determining a connection state between a non-invasive acoustic sensor and a medical patient, the method comprising:
- receiving an acoustic physiological signal from an acoustic sensor configured to couple with a medical patient;
receiving a photoplethysmograph (PPG) waveform from an optical sensor configured to couple with the medical patient;
extracting low frequency components from the acoustic physiological signal;
extracting high frequency components from the acoustic physiological signal;
calculating an acoustic pulse rate measurement from the extracted low frequency components;
calculating a respiration rate measurement from the extracted high frequency components;
calculating an optical pulse rate measurement from the PPG waveform;
determining a difference between the acoustic pulse rate measurement calculated from the acoustic physiological signal and the optical pulse rate measurement calculated from the PPG waveform;
comparing the difference with a threshold value; and
in response to said comparison, outputting the calculated respiration rate measurement with an indication of connection quality of the non-invasive acoustic sensor.
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Abstract
Embodiments described herein include sensors and sensor systems having probe-off detection features. For example, sensors and physiological monitors described herein include hardware and/or software capable of providing an indication of the integrity of the connection between the sensor and the patient. In various embodiments, the physiological monitor is configured to output an indication of a probe-off condition for an acoustic sensor (or other type of sensor). For example, in an embodiment, a signal from an acoustic sensor is compared with a signal from a second sensor to determine a probe-off condition.
1001 Citations
8 Claims
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1. A method of determining a connection state between a non-invasive acoustic sensor and a medical patient, the method comprising:
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receiving an acoustic physiological signal from an acoustic sensor configured to couple with a medical patient; receiving a photoplethysmograph (PPG) waveform from an optical sensor configured to couple with the medical patient; extracting low frequency components from the acoustic physiological signal; extracting high frequency components from the acoustic physiological signal; calculating an acoustic pulse rate measurement from the extracted low frequency components; calculating a respiration rate measurement from the extracted high frequency components; calculating an optical pulse rate measurement from the PPG waveform; determining a difference between the acoustic pulse rate measurement calculated from the acoustic physiological signal and the optical pulse rate measurement calculated from the PPG waveform; comparing the difference with a threshold value; and in response to said comparison, outputting the calculated respiration rate measurement with an indication of connection quality of the non-invasive acoustic sensor. - View Dependent Claims (2, 3)
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4. A system for determining a connection state between a non-invasive acoustic sensor and a medical patient, the system comprising:
one or more processors configured to; receive an acoustic physiological signal from an acoustic sensor configured to couple with a medical patient; receive a photoplethysmograph (PPG) waveform from an optical sensor configured to couple with the medical patient; extract low frequency components from the acoustic physiological signal; extract high frequency components from the acoustic physiological signal; calculate an acoustic pulse rate measurement from the extracted low frequency components; calculate a respiration rate measurement from the extracted high frequency components; calculate an optical pulse rate measurement from the PPG waveform; determine, with one or more processors, a difference between the acoustic pulse rate measurement and the optical pulse rate measurement; compare the difference with a threshold value; and output the respiration rate measurement with an indication of connection state of the acoustic sensor based on the comparison. - View Dependent Claims (5, 6)
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7. A method of determining a connection state between a non-invasive acoustic sensor and a medical patient, the method comprising:
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receiving an acoustic physiological signal from an acoustic sensor, the acoustic physiological signal reflecting first physiological information of a patient; receiving a photoplethysmograph (“
PPG”
) waveform from an optical sensor, the PPG signal reflecting second physiological information of the patient;extracting a first feature from the acoustic physiological signal corresponding to a physiological feature; extracting a second feature from the PPG waveform corresponding to the same physiological feature; extracting high frequency components from the acoustic physiological signal; calculating a respiration rate measurement from the high frequency components of the acoustic physiological signal; comparing, with one or more processors, an acoustic pulse rate measure from the acoustic physiological signal and the optical pulse rate measure from PPG signal; determining an indication of connection state of the acoustic sensor in response to said comparing the acoustic pulse rate measure with the optical pulse rate measure; and outputting the respiration rate measurement with the indication of connection state of the acoustic sensor. - View Dependent Claims (8)
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Specification