SYSTEM FOR DETERMINING AND MONITORING DESATURATION INDICES AND INSTANTANEOUS RESPIRATORY RATE
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Accused Products
Abstract
Determining and monitoring desaturation indices and instantaneous respiratory rate, based on extracting components from the blood oxygen saturation (SpO2) signal captured by an oximeter, obtaining and processing the data in the frequency domain in order to detect respiratory events and determine values such as respiratory rate and deviations therefrom (tachypnea/bradypnea) and desaturation indices.
Bioengineering applications in the field of medicine include monitoring and assisting with the diagnosis of respiratory disorders for its use in anesthesia, intensive care units and healthcare emergencies and assisting in the diagnosis of sleep apnea/hypopnea syndrome (SAHS).
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Citations
26 Claims
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1-7. -7. (canceled)
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8. A method for determining and monitoring physiological parameters comprising:
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detecting absorption of electromagnetic radiation by hemoglobin molecules in arterial blood of a subject with an oximeter, wherein the oximeter produces an electrical signal related to a percentage of the hemoglobin molecules saturated with oxygen; conditioning the electrical signal; digitizing the electrical signal; processing the digitized signal to yield a power spectral density; averaging the power spectral density in a selected band or frequency range to yield an average value of the power spectral density; assessing an average number of oxygen desaturations experienced by the subject per unit of time using the average value of the power spectral density; and providing an index based on the average number of oxygen desaturations experienced by the subject per unit of time. - View Dependent Claims (9, 10, 11)
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12. A method for determining and monitoring physiological parameters comprising:
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detecting absorption of electromagnetic radiation by hemoglobin molecules in arterial blood of a subject with an oximeter, wherein the oximeter produces an electrical signal related to a percentage of the hemoglobin molecules saturated with oxygen; conditioning the electrical signal; digitizing the electrical signal; processing the digitized signal to yield a power spectral density; averaging the power spectral density in a selected band to yield an average value of the power spectral density in the selected band; and providing an index related to an incidence of abnormally fast, abnormally slow, or normal respiratory rate to facilitate diagnosis of respiratory function, wherein the index is related to the average value of the power spectral density in the selected band. - View Dependent Claims (13, 14, 15)
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16. A respiratory diagnostic device comprising:
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a data interface configured to receive an electrical signal from an oximetry sensor coupled to a subject and to digitize the electrical signal, wherein the electrical signal is related to blood oxygen saturation of the subject; and a microprocessor system configured to receive the digitized signal from the data interface and to process the digitized signal to assess a blood oxygen saturation and a respiratory rate of the subject, based on a frequency analysis of the digitized signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification