Device for monitoring breathing during sleep and control of CPAP treatment that is patient controlled

• US 5,199,424 A
• Filed: 12/12/1991
• Issued: 04/06/1993
• Est. Priority Date: 06/26/1987
• Status: Expired due to Term

• Current Assignee: Resmed Limited (ResMed Incorporated)
• Original Assignee: Christopher Lynch, Colin E. Sullivan
• Inventors: Lynch, Christopher, Sullivan, Colin E.
• Primary Examiner(s): Burr, Edgar S.
• Assistant Examiner(s): ASHER, KIMBERLY L
• Application Number:
  US07/806,157
• Time in Patent Office: 481 Days
• Field of Search: 128/204.21, 128/204.23, 128/204.18, 128/205.25, 128/207.18, 128/206.18, 128/716, 128/719
• 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 releasably sealed air communication with a patient'"'"'s respiratory system from an air pressure source;

continuously delivering pressurized air to the patient, the pressurized air delivered beginning from an initial low pressure level;

increasing the pressure level of pressurized air delivered to the patient over a variable period of time selected by the patient until the pressure reaches a preset operating therapeutic level; and

,

maintaining the preset operating therapeutic level of pressured air delivered to the patient following the period of time selected by the patient.

2. The CPAP therapy method as in claim 1 wherein:

air pressure is automatically increased by a delay timer mechanism of sufficient construction to raise the pressure from the initial low pressure level to the preset operating therapeutic level over the variable period of time selected by the patient on the delay timer mechanism.

3. The CPAP therapy method as in claim 1 wherein:

the sealed air communication is provided by attaching a mask and/or nasal prongs.

4. The CPAP therapy method as in claim 1 wherein:

the initial lower pressure level is about 3-5 cm H₂ O gauge pressure.

5. 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, selectable by the patient, for controlling the time during which continuously delivered pressurized air rises from an initial low pressure level to a preset operating therapeutic level; and

,

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

6. The air flow device as in claim 5 wherein the variable pressure delivery means includes a mask and/or nasal prongs.

7. The air flow device as in claim 6 wherein the mask provides sealed air communication with the patient'"'"'s nasal passages.

8. The air flow device as in claim 5 wherein the controlling means includes a delay timer mechanism of sufficient construction automatically to raise the pressure level.