Device for monitoring breathing during sleep and ramped control of CPAP treatment

• US 6,705,315 B2
• Filed: 06/06/2001
• Issued: 03/16/2004
• Est. Priority Date: 06/26/1987
• Status: Expired due to Fees

• Current Assignee: Resmed Limited (ResMed Incorporated)
• Original Assignee: Resmed Limited (ResMed Incorporated)
• Inventors: Lynch, Christopher, Sullivan, Colin E.
• Primary Examiner(s): Lewis, Aaron J.
• Assistant Examiner(s): MITCHELL, TEENA KAY
• Application Number:
  US09/875,326
• Publication Number:
  US 20020007127A1
• Time in Patent Office: 1,014 Days
• Field of Search: 128/204.18, 128/204.21, 128/204.22, 128/204.23, 128/205.11, 128/205.18, 128/205.25, 128/206.12, 128/203.12, 128/203.14, 128/206.18, 600/529, 600/532, 600/533, 600/586
• US Class Current: 128/204.18
• CPC Class Codes: A61B 5/097 Devices for facilitating collection of breath or for directing breath into or through measuring devices
• CPC Class Codes: A61B 5/6814 Head
• CPC Class Codes: A61B 7/003 Detecting lung or respiration noise
• CPC Class Codes: A61F 5/56 Devices for preventing snoring by influencing the respiratory system by gas treatment A61M16/00
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 2016/0024 with an on-off output signal, e.g. from a switch
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2230/04 Heartbeat characteristics, e.g. ECG, blood pressure modulation
• CPC Class Codes: A61M 2230/10 Electroencephalographic signals
• CPC Class Codes: A61M 2230/18 Rapid eye-movements [REM]
• CPC Class Codes: A61M 2230/205 partial oxygen pressure (P-O2)
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)
• CPC Class Codes: A61M 2230/60 Muscle strain, i.e. measured on the user

Abstract

A CPAP apparatus including: a variable pressured air source and means to vary the air pressure delivered therefrom; a nose piece for sealed air communication with a patient'"'"'s respiratory system; an air communication line from the air source to the nose piece; a sound transducer adapted to be in sound communication with the patient'"'"'s respiratory system; and a feedback system controlling the output pressure of the air source in response to an output from the transducer so as to increase the output air pressure from said air source, in response to detection of sound indicative of snoring, in accordance with a predefined procedure. The sound transducer, in its most general form, comprises a pressure transducer which, in addition to detecting snoring sounds, can detect other respiratory parameters such as the rate of breathing, inhaled air flow volume, and inhaled air flow rate. Output air pressure from air source is increased in response to one or more of these parameters in accordance with a pre-defined procedure.

Claims

1. A method of CPAP therapy comprising the steps of providing releasable sealed air communication with a patient'"'"'s respiratory system from an air pressure source, and delivering pressurized air from said source to the patient so that the air pressure automatically gradually increases over a period of time to reach a predetermined maximum therapeutic operating level, wherein said period of time exceeds a single breathing cycle of the patient.

2. The method of claim 1 wherein the time period of the automatic increase can be adjusted.

3. A method of CPAP therapy comprising the steps of providing releasable sealed air communication with a patient'"'"'s respiratory system from an air pressure source, and delivering pressurized air from said source as the patient attempts to fall asleep while automatically gradually increasing said pressurized air over a period of time to reach a predetermined maximum therapeutic operating level, wherein said period of time exceeds a single breathing cycle of the patient.

4. The method of claim 3 wherein the time period of said automatic increase can be adjusted.

5. A method of CPAP therapy comprising the steps of providing releasable sealed air communication with a patient'"'"'s respiratory system from an air pressure source, and delivering pressurized air from said source to the patient so that the air pressure automatically gradually increases over a period of time to reach a predetermined therapeutic operating level, wherein said period of time exceeds a single breathing cycle of the patient.

6. The method of claim 5 wherein the time period of the automatic increase can be adjusted.

7. A method of CPAP therapy comprising the steps of providing releasable sealed air communication with a patient'"'"'s respiratory system from an air pressure source, and delivering pressurized air from said source as the patient attempts to fall asleep while automatically gradually increasing said pressurized air over a period of time to reach a predetermined therapeutic operating level, wherein said period of time exceeds a single breathing cycle of the patient.

8. The method of claim 7 wherein the time period of said automatic increase can be adjusted.

9. An air flow device, useful in CPAP therapy of a patient, comprising:

means for delivering variable pressure levels of pressurized air to a patient'"'"'s respiratory system;

means for controlling the period of time during which continuously delivered pressurized air automatically gradually increases to a predetermined therapeutic operating level, wherein said period of time exceeds a single breathing cycle of the patient; and

,

means for automatically maintaining the delivered pressurized air at the operating therapeutic level after the operating therapeutic level has been reached.

10. An air flow device, useful in CPAP therapy of a patient, comprising:

a motor with a blower;

a speed control unit coupled to said motor; and

a control circuit coupled to said speed control, wherein said control circuit causes said blower to automatically gradually increase to a predetermined therapeutic operating level wherein said increase occurs over a period of time exceeding a single breathing cycle of a patient.

11. The device of claim 10 wherein said control circuit may be set to adjust the time period of the automatic increase.

12. The device of claim 11 wherein said control circuit may be set to adjust the therapeutic operating level.

13. The device of claim 12 wherein said control circuit commences operation at a minimum pressure.

14. The device of claim 13 wherein said control circuit comprises:

a delay control;

a timer,

a switch mode power supply, and

an upper pressure control.