METHOD AND APPARATUS FOR NON-INVASIVE MONITORING OF RESPIRATORY PARAMETERS IN SLEEP DISORDERED BREATHING
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Accused Products
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
105 Claims
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1-72. -72. (canceled)
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73. An air delivery system, comprising:
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a controllable flow generator operable to generate a supply of pressurized breathable gas to be provided to a patient for treatment; a pulse oximeter configured to determine a measure of patient effort during a treatment period and provide a patient effort signal to control operation of the flow generator; an airflow measurement patient interface configured to measure cardiogenic respiratory flow of a patient and provide a cardiogenic respiratory flow signal to control operation of the flow generator; and a processor to calculate a pulse-transit time based at least in part on the cardiogenic respiratory flow signal and the patient effort signal. - View Dependent Claims (74, 75, 76, 77)
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78. A respiratory effort monitoring apparatus, comprising:
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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 indicative of respiratory rate; an airflow measurement device configured to measure cardiogenic respiratory flow of the patient and generate a cardiogenic respiratory flow signal; and a processor to calculate relative variations in pulse-transit time based at least in part on the cardiogenic respiratory flow signal and the pulse oximeter signal. - View Dependent Claims (79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91)
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92. A monitoring system for a patient, comprising;
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a pulse oximeter configured to attach to the patient and generate a photoplethysmographic signal; a pressure sensor configured to sense nasal 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). - View Dependent Claims (93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105)
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Specification