Acoustic sensor and ventilation monitoring system
First Claim
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1. A method of predicting an opioid overdose with an acoustic measurement device, the acoustic measurement device having a sound transducer, the sound transducer configured to measure sound associated with airflow through a mammalian trachea, the method comprising:
- correlating the measured sound into a measurement of tidal volume;
calculating an absolute tidal volume, a direction of tidal volume, and a rate of change of tidal volume;
assigning a risk index value of a likelihood of the opioid overdose to each of the absolute tidal volume, the direction of tidal volume, and the rate of change of tidal volume, each risk index value being one selected from the group consisting of a positive score and a negative score based on a predefined scale, the positive score indicating a high likelihood of an opioid overdose and the negative score indicating a low likelihood of an opioid overdose;
calculating a sum of the risk index values assigned to each of the absolute tidal volume, the direction of tidal volume, and the rate of change of tidal volume; and
generating at least one selected from the group consisting of an alert and an alarm if the calculated sum exceeds a predetermined risk score threshold.
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Abstract
A method of monitoring respiration with an acoustic measurement device, the acoustic measurement device having a sound transducer, the sound transducer configured to measure sound associated with airflow through a mammalian trachea, the method includes correlating the measured sound into a measurement of tidal volume and generating at least one from the group consisting of an alert and an alarm if the measured tidal volume falls outside of a predetermined range.
148 Citations
20 Claims
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1. A method of predicting an opioid overdose with an acoustic measurement device, the acoustic measurement device having a sound transducer, the sound transducer configured to measure sound associated with airflow through a mammalian trachea, the method comprising:
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correlating the measured sound into a measurement of tidal volume; calculating an absolute tidal volume, a direction of tidal volume, and a rate of change of tidal volume; assigning a risk index value of a likelihood of the opioid overdose to each of the absolute tidal volume, the direction of tidal volume, and the rate of change of tidal volume, each risk index value being one selected from the group consisting of a positive score and a negative score based on a predefined scale, the positive score indicating a high likelihood of an opioid overdose and the negative score indicating a low likelihood of an opioid overdose; calculating a sum of the risk index values assigned to each of the absolute tidal volume, the direction of tidal volume, and the rate of change of tidal volume; and generating at least one selected from the group consisting of an alert and an alarm if the calculated sum exceeds a predetermined risk score threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20)
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12. A method of predicting an opioid overdose in a mammal, comprising:
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continually measuring sound waves emanating from an airflow into and out of the mammalian trachea with an acoustic measurement device releasably affixable to the mammal'"'"'s skin proximate the mammalian trachea; correlating the measured sound waves into a measurement of the mammal'"'"'s respiratory rate and tidal volume; calculating a direction trend and rate of change of the respiratory rate and tidal volume at a predetermined interval; during the predetermined interval, assigning a risk index value to the mammal'"'"'s; (a) respiratory rate and tidal volume; (b) direction trend of the respiratory rate and tidal volume; and (c) rate of change of the respiratory rate and tidal volume, each risk index value being one selected from the group consisting of a positive score and a negative score based on a predefined scale, the positive score indicating a high likelihood of an opioid overdose and the negative score indicating a low likelihood of an opioid overdose; summing (a), (b), and (c); and generating at least one from the group consisting of an alert and an alarm if a sum of (a), (b), and (c) falls outside of a predetermined opioid risk range. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of predicting an opioid overdose, comprising:
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at least periodically measuring sound emanating from an airflow into and out of a mammal'"'"'s trachea and lungs with an acoustic measurement device, the acoustic measurement device including a housing including at least two sound transducers, the housing being sized and configured to be adhered to the mammal'"'"'s trachea with a coupling component, the housing defining an opening, the at least two sound transducers being disposed within the housing opposite the opening; and wirelessly communicating the measured sound to a remote controller, the remote controller being configured to; correlate the measured sound energy into a measurement of the mammal'"'"'s respiratory rate and tidal volume; assign a first risk index value indicating a likelihood of the opioid overdose based on the measured respiratory rate; assign a second risk index value indicating a likelihood of the opioid overdose based on the measured tidal volume; calculate a rate of change of the measured respiratory rate and tidal volume at over a predetermined interval; assign a third risk index value indicating a likelihood of the opioid overdose based on the calculated rate of change of the measured respiratory rate; assign a fourth risk index value indicating a likelihood of the opioid overdose based on the calculated rate of change of tidal volume, the first risk index value, the second risk index value, the third risk index value, and the fourth risk index value each being one selected from the group consisting of a positive score and a negative score based on a predefined scale, the positive score indicating a high likelihood of an opioid overdose and the negative score indicating a low likelihood of an opioid overdose; and generate at least one from the group consisting of an alert and alarm if a sum of the first risk index value, the second risk index value, the third risk index value, and the fourth risk index value, exceed a predetermined risk score threshold.
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Specification