Auto CPAP system profile information

• US 6,550,478 B2
• Filed: 07/10/2001
• Issued: 04/22/2003
• Est. Priority Date: 11/14/1991
• Status: Expired due to Term

• Current Assignee: University Technologies International, Inc.
• Original Assignee: University Technologies International, Inc.
• Inventors: Feroah, Thomas Richard, Remmers, John Edward
• Primary Examiner(s): Lewis, Aaron J.
• Application Number:
  US09/901,147
• Publication Number:
  US 20020078957A1
• Time in Patent Office: 651 Days
• Field of Search: 128/204.18, 128/204.21, 128/204.23
• US Class Current: 128/204.18
• CPC Class Codes: A61M 16/026 specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2205/3553 remote, e.g. between patient's home and doctor's office
• CPC Class Codes: A61M 2205/3561 local, e.g. within room or hospital

Abstract

The present invention relates to systems and methods for automatically and continuously regulating the level of nasal pressure to an optimal value during OSA treatment. OSA therapy is implemented by a device which automatically re-evaluates an applied pressure and continually searches for a minimum pressure required to adequately distend a patient'"'"'s pharyngeal airway. For example, this optimal level varies with body position and stage of sleep throughout the night. In addition, this level varies depending upon the patient'"'"'s body weight and whether or not alcohol or sleeping medicine has been ingested.

Claims

1. System for providing continuous positive airway pressure in an upper airway system comprising:

means for detecting airflow in an upper airway system of a patient;

means for generating pressure in said upper airway system in response to a command pressure; and

means for adaptively controlling said pressure generating means in response to said detecting means to automatically provide continuous positive airway pressure, said adaptive control means introducing incremental pressure perturbations for setting a command pressure relative to a predetermined critical pressure.

2. System according to claim 1, wherein said adaptive control means further includes:

means for averaging airflow information over a predetermined period of time and for determining non-respiratory flow using said averaged information; and

means for identifying periods of inspiration and expiration using said non-respiratory flow information.

3. System according to claim 2, wherein said adaptive control means identifies said critical pressure-as a pressure at which a predetermined upper airway obstruction occurs during said inspiration.

4. System according to claim 3, wherein said adaptive control means extracts features indicative of airflow resistance in said upper airway system to identify said critical pressure and to set said command pressure.

5. System according to claim 4, wherein said extracted features include flatness, roundness and peak flow.

6. System according to claim 1 wherein said adaptive control means further includes:

means for incorporating an additional external input from an oxygen saturation monitor or a snoring monitor.

7. System according to claim 1 wherein said adaptive control means further includes:

means for incorporating an additional external input from a monitor of pressure, sound, oxygen saturation or body position.

8. A system for providing continuous positive airway pressure in an upper airway system comprising a detector adapted to detect airflow in an upper airway system of a patient;

an air pressure generating unit adapted to generate pressure in the upper airway system; and

a processor adapted to adaptively control the air pressure generating unit, the processor adapted to control the detector to automatically provide continuous positive airway pressure, the processor controlling the air pressure generating unit to introduce incremental pressure pertubations for setting a mask pressure relative to a predetermined critical pressure.