Method And Apparatus For Providing Positive Airway Pressure To A Patient
First Claim
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1. A method for providing positive airway pressure to a patient, comprising:
- sensing load on a motor that pressurizes flow of air to an airway of the patient;
comparing a pressure sensed proximate the airway to a therapeutic pressure; and
adjusting motor speed, based on motor load, so that the sensed pressure equals the therapeutic pressure.
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Abstract
Methods and apparatus for treatment of medical disorders such as obstructive sleep apnea and congestive heart failure are disclosed. A method involves delivering pressurized air, oxygen or other breathing gas to a patient during a respiratory cycle, where pressure of the air is decreased according to an expiratory unloading factor during expiration. The timing and magnitude of the pressure change may be fully automated and responsive to feedback from a motor load sensor, optionally in combination with a pressure sensor.
88 Citations
34 Claims
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1. A method for providing positive airway pressure to a patient, comprising:
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sensing load on a motor that pressurizes flow of air to an airway of the patient; comparing a pressure sensed proximate the airway to a therapeutic pressure; and adjusting motor speed, based on motor load, so that the sensed pressure equals the therapeutic pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for providing positive airway pressure to a patient, comprising:
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a flow generator having a motor and a blower for providing a flow of air at a selected inspiratory pressure; a patient interface connected with the flow generator, for conducting the air to an airway of the patient; a pressure sensor for monitoring pressure of the air at the interface and generating an interface pressure signal; a load sensor for sensing load on the motor and generating a load signal; a respiratory phase detector in communication with the load and pressure sensors, for processing the load signal with the interface pressure signal to determine a respiratory phase, and for generating a phase signal; a processor in communication with the pressure sensor, load sensor and phase detector, for processing the phase, load and pressure signals with the inspiratory pressure and a selected expiratory pressure to determine an expiratory unloading factor, the expiratory unloading factor indicating a difference in motor load required for generating the inspiratory and expiratory pressures at the interface; and a pressure controller in communication with the processor and the flow generator, for altering operation of the motor during an expiratory phase and according to the expiratory unloading factor, to achieve the expiratory pressure at the interface. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of providing positive airway pressure to a patient, comprising:
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supplying a flow of air to an airway of a patient at a selected inspiratory pressure; determining an inspiratory phase of respiration; monitoring pressure of the air proximate the airway; monitoring load on a motor generating the flow of air; processing the pressure proximate the airway, the load and the selected inspiratory pressure with a selected expiratory pressure that is lower than the inspiratory pressure, to correlate the inspiratory pressure with an inspiratory motor load and the expiratory pressure with an expiratory motor load; determining, from the correlated pressures, an expiratory unloading factor for achieving the expiratory pressure proximate the airway; determining an expiratory phase of breathing; and applying the expiratory unloading factor to reduce pressure proximate the airway from the inspiratory pressure to the expiratory pressure. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method for providing positive airway pressure to a patient, comprising:
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sensing load on a motor that pressurizes flow of air to an airway of the patient; correlating the load with pressure at the airway; and adjusting motor speed, based on motor load, so that the correlated pressure equals a therapeutic pressure that maintains functionality of the airway. - View Dependent Claims (27, 28)
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29. A software product, comprising instructions, stored on computer-readable media, wherein the instructions, when executed by a computer, perform steps for delivering of positive airway pressure to a patient, comprising:
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instructions for supplying a flow of air to an airway of a patient at an inspiratory pressure; instructions for monitoring load on a motor pressurizing the flow of air; instructions for processing data indicative of the inspiratory pressure with data indicative of the load, to correlate the inspiratory pressure with the load; instructions for determining, from the correlated pressure and load, an expiratory unloading factor that achieves a selected expiratory pressure at the airway; instructions for determining an expiratory phase of breathing; and instructions for controlling the motor with the expiratory unloading factor, to reduce pressure at the patient airway from the inspiratory pressure to the expiratory pressure.
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30. Apparatus for providing positive airway pressure to a patient, comprising:
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a positive airway pressure module in communication a CPAP machine, for regulating pressure of air delivered to a patient during an expiratory phase of breathing;
whereinthe module determines load on a CPAP machine motor and correlates the load with a therapeutic CPAP level delivered to the patient, by the CPAP machine; and
whereinbased upon the correlated load and a selected expiratory pressure, the module reduces the CPAP level delivered to the patient during the expiratory phase, to the expiratory pressure. - View Dependent Claims (31, 32)
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33. A method for providing positive airway pressure to a patient, comprising:
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sensing pressure of air delivered to a patient airway, during an inspiratory phase of breathing; sensing load on a motor pressurizing the air to the patient, during an expiratory phase of breathing; and automatically reducing speed of the motor according to the sensed load, to reduce pressure at the patient airway, wherein pressure during the expiratory phase is directly proportional to the motor load. - View Dependent Claims (34)
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Specification