Method and apparatus for non-invasive monitoring of respiratory parameters in sleep disordered breathing
First Claim
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1. An air delivery system, comprising:
- a controllable flow generator configured to generate a supply of pressurized breathable gas to be provided to a patient for treatment;
a processor configured to control the controllable flow generator;
a pulse oximeter configured to determine a measure of patient effort during a treatment period and provide a patient effort signal to the processor;
an airflow measurement patient interface configured to measure cardiogenic respiratory flow of the patient and provide a cardiogenic respiratory flow signal to the processor; and
wherein the processor is configured to calculate a pulse transit time based at least in part on the cardiogenic respiratory flow signal and the patient effort signal and control the controllable flow generator based at least in part on the pulse transit time.
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Abstract
An air delivery system includes a controllable flow generator operable to generate a supply of pressurized breathable gas to be provided to a patient for treatment and a pulse oximeter configured to determine a measure of patient effort during a treatment period and provide a patient effort signal for input to control operation of the flow generator.
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Citations
31 Claims
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1. An air delivery system, comprising:
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a controllable flow generator configured to generate a supply of pressurized breathable gas to be provided to a patient for treatment; a processor configured to control the controllable flow generator; a pulse oximeter configured to determine a measure of patient effort during a treatment period and provide a patient effort signal to the processor; an airflow measurement patient interface configured to measure cardiogenic respiratory flow of the patient and provide a cardiogenic respiratory flow signal to the processor; and wherein the processor is configured to calculate a pulse transit time based at least in part on the cardiogenic respiratory flow signal and the patient effort signal and control the controllable flow generator based at least in part on the pulse transit time. - View Dependent Claims (2, 3, 4, 5)
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6. A respiratory therapy system, comprising:
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a controllable flow generator configured to generate a supply of pressurized breathable gas to be provided to a patient for treatment of a health disorder; a pulse oximeter configured to derive a pulse oximeter signal; a signal processor configured to receive the pulse oximeter signal and generate a patient effort signal that is indicative of respiratory rate; an airflow measurement device configured to measure cardiogenic respiratory flow of the patient and generate a cardiogenic respiratory flow signal; a processor configured to calculate relative variations in pulse transit time based at least in part on the cardiogenic respiratory flow signal and the pulse oximeter signal; and a feedback controller configured to control the controllable flow generator based at least in part on the relative variations in pulse transit time. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An air delivery system for a patient, comprising;
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a controllable flow generator configured to generate a supply of pressurized breathable gas to be provided to a patient for treatment; a pulse oximeter configured to attach to the patient and generate a photoplethysmographic signal; a pressure sensor configured to sense nasal flow or oro-nasal flow and to generate an airflow signal from the nasal or oro-nasal flow; an intermediate signal processor configured to receive the photoplethysmographic signal and the airflow signal and to generate a first signal based on the airflow signal and a second signal based on the photoplethysmographic signal; and a combined processor configured to receive the first signal and the second signal and to generate results based at least in part on the first signal and the second signal, the results being selected from the group consisting of;
delay between respiration changes and blood gas adjustments, circulatory delay, and pulse transit time (PTT),wherein the combined processor is configured control the controllable flow generator based on at least one from the group consisting of the delay between respiration changes and blood gas adjustments, the circulatory delay, and the pulse transit time (PTT). - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification