Method and means of physiological monitoring using sonification
First Claim
1. A respiratory sonification monitoring system for monitoring respiration and/or, gas exchange in a subject including in combination;
- capnometric means for measuring respiratory carbon dioxide concentrations,flowmeter means for measuring gas flow and volume of said gas flow by the integration of the gas flow with respect to time,signal processing means adapted to process into digital information, signal output from the capnometric means and the flowmeter means throughout the subject'"'"'s breathing process,sound synthesizer means adapted to convert said digital information into a synthesized audio output which is not a simulated realistic body sound,wherein in use, changes in respiratory flow during inhalation and exhalation, and changes in end tidal carbon dioxide concentrations (ETCO2) and cumulative tidal volume (cumVt) of the subject are represented as changes in the synthesized audio.
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Abstract
The invention resides in a respiratory sonification monitoring method and system for monitoring respiration in a subject including the use of capnometric means for measuring carbon dioxide concentrations, flowmeter means for measuring gas flow and volume of gas; means adapted to process into digital information, signal output from the capnometric means and the flowmeter means, sound synthesizer means adapted to convert the digital information into synthesised audio output, wherein, changes in respiratory flow during inhalation and exhalation, and changes in end tidal carbon dioxide concentrations (ETC02) and cumulative tidal volume (cumVt) of the subject can be represented as changes in synthesised sound heard through a loudspeaker, headphone or ear piece.
32 Citations
14 Claims
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1. A respiratory sonification monitoring system for monitoring respiration and/or, gas exchange in a subject including in combination;
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capnometric means for measuring respiratory carbon dioxide concentrations, flowmeter means for measuring gas flow and volume of said gas flow by the integration of the gas flow with respect to time, signal processing means adapted to process into digital information, signal output from the capnometric means and the flowmeter means throughout the subject'"'"'s breathing process, sound synthesizer means adapted to convert said digital information into a synthesized audio output which is not a simulated realistic body sound, wherein in use, changes in respiratory flow during inhalation and exhalation, and changes in end tidal carbon dioxide concentrations (ETCO2) and cumulative tidal volume (cumVt) of the subject are represented as changes in the synthesized audio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of monitoring human respiration and gas exchange in a subject during anaesthesia or intensive care including the steps of connecting a flaw meter to an anaesthesia circuit to measure the rate at which gas is flowing into (inhalation) and out of (exhalation) a patient'"'"'s lungs, connecting a capnometer to the anaesthesia circuit to measure carbon dioxide concentrations, inclusive of end tidal carbon dioxide concentrations (ETCO2) at the end of each exhalation, processing signals from the flow meter and the capnometer by signal processing means into digital information, converting the digital information by sound synthesizer means into audio output, wherein, the onset and offset of inhalation and exhalation are represented as changes in tone of a synthesized musical note, the value of cumulative tidal volume (cumVt) is represented as sound intensity (loudness) and/or sound quality (timbre or brightness) of the tone, and end tidal carbon dioxide levels (ETCO2) are represented by relative changes in pitch across respiratory cycles, wherein the pitch of the exhalation tone is set at a minor third interval below that of the inhalation tone.
Specification