Multi-channel self-contained apparatus and method for diagnosis of sleep disorders

• US 6,171,258 B1
• Filed: 10/08/1998
• Issued: 01/09/2001
• Est. Priority Date: 10/08/1998
• Status: Expired due to Term

• Current Assignee: NovaSom, Inc. (BioSerenity SAS)
• Original Assignee: Sleep Solutions, Inc. (BioSerenity SAS)
• Inventors: Karakasoglu, Ahmet, Adams, John Scott, Johnson, Karl S.
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): ASTORINO, MICHAEL C
• Application Number:
  US09/169,780
• Time in Patent Office: 824 Days
• Field of Search: 600/300, 600/459, 600/481-486, 600/500-508, 600/529-538, 128/897-898
• US Class Current: 600/529
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287
• CPC Class Codes: A61B 5/369 Electroencephalography [EEG] devices for psychotechnics A61B5/16
• CPC Class Codes: A61B 5/389 Electromyography [EMG]
• CPC Class Codes: A61B 5/398 Electrooculography [EOG], e.g. detecting nystagmus; Electroretinography [ERG]
• CPC Class Codes: A61B 5/4818 Sleep apnoea
• CPC Class Codes: A61B 5/6814 Head
• CPC Class Codes: A61B 5/726 using Wavelet transforms
• CPC Class Codes: A61B 5/7264 Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems neural networks per se G06N3/00; expert systems per se G06N5/00
• CPC Class Codes: A61B 7/003 Detecting lung or respiration noise

Abstract

A sleep monitoring apparatus adapted to be mounted on a human head of a patient having a front face and first and second sides with the front face having a mouth, a nose with nostrils therein and first and second eyes and first and second ears on the first and second sides comprising a movable headpiece adapted to be mounted on the head and engages the head above the eyes. An acoustical device is provided which is adapted to be positioned on the face in the vicinity of the nose and/or mouth of the patient and having at least one acoustic duct from receiving respiratory airflow from the patient. A sensor which is exposed to the acoustic duct is provided for sensing turbulence and/or pressure changes in the respiratory airflow in the acoustic duct and providing an electrical output. Electrical circuitry is carried by the headpiece for receiving the electrical output and for processing the electrical output to provide a real-time signal from the headpiece which is indicative of the breathing of the patient.

Claims

1. A self-contained sleep monitoring apparatus adapted to be mounted on and solely carried by the body of a patient having a front face and first and second sides with the front face having a mouth, a nose with nostrils therein and first and second eyes and first and second ears on the first and second sides comprising a removable bodypiece adapted to be mounted on the body of the patient, an acoustical device adapted to be positioned on the face in the vicinity of the nose and/or mouth of the patient and having at least one acoustic space receiving respiratory airflow from the patient, a sensor exposed to the acoustic space for sensing turbulence and/or pressure changes in the respiratory airflow in the acoustic space and providing an electrical output, electrical circuitry carried by the bodypiece and movable with the patient for receiving the electrical output and for processing the electrical output to provide a real-time signal from the bodypiece which is indicative of the breathing of the patient.

2. Apparatus as in claim 1 wherein said removable bodypiece is a headband adapted to be mounted on the head of the patient and engaging the head above the eyes and having stretchable elastic characteristics.

3. Apparatus as in claim 1 wherein a plurality of event values are provided based upon a minimum duration and wherein a respiratory disturbance index plus is ascertained which is based upon the sum of event values divided by the duration of sleep of the patient.

4. Apparatus as in claim 1 wherein said sensor exposed to the acoustical space is a Helmholtz resonator.

5. Apparatus as in claim 4 wherein said Helmholtz resonator has a frequency which is substantially above the frequency range of hearing of the human ear.

6. Apparatus as in claim 5 wherein said resonant frequency has a frequency 27 kilocycles.

7. Apparatus as in claim 4 wherein said Helmholtz resonator is formed of a metal to suppress low frequencies.

8. Apparatus as in claim 4 wherein said sensor includes a microphone mounted in the Helmholtz resonator.

9. Apparatus as in claim 1 further including additional sensors connected to the electrical circuitry.

10. Apparatus as in claim 9 wherein said additional sensors include sensors adapted to be mounted on the head of the patient for picking up EEG signals from the brain of the patient.

11. Apparatus as in claim 9 wherein said additional sensors include sensors adapted to be mounted on the forehead of the patient in the vicinity of the eyes of the patient for ascertaining EOG signals.

12. Apparatus as in claim 9 wherein said additional sensors include a pulse oximeter adapted to be carried by the head of the patient.

13. Apparatus as in claim 9 wherein said additional sensors include a sensor adapted to be mounted on the body of the patient for sensing the body position of the patient.

14. Apparatus as in claim 9 wherein said additional sensors include a sensor adapted to be mounted on the body of the patient external of the body of the patient for sensing vibrations of the trachea of the patient.

15. Apparatus as in claim 9 wherein said additional sensors include a sensor adapted to be mounted on the body of the patient for sensing the heart rate of the patient.

16. Apparatus as in claim 3 wherein said event value has a duration of at least 10 seconds.

17. A method for diagnosing sleep disorders of a human being having a head having a nose and nostrils therein with the use of self-contained apparatus solely carried by the human body and a mouth and first and second eyes and first and second ears comprising sensing turbulence and/or pressure changes in the respiratory airflow from the nose and/or mouth of the patient, generating a resonant frequency in response to sensing turbulence and/or pressure changes in the respiratory airflow and providing an electrical output and utilizing the electrical output to provide a real time signal which is indicative of breathing of the patient.

18. A method as in claim 17 further including the steps of ascertaining a plurality of events with respect to the patient and having event values which are based upon a minimum duration of time and further including the step of summing the event values and dividing the sum of the event values by the duration of sleep to provide an enhanced respiratory disturbance index RDIplus.

19. A method as in claim 18 together with the step of sensing EEG signals from the brain of the patient and utilizing them in the real time signal.

20. A method as in claim 18 together with the step of sensing eye movement of the patient and providing an electrical signal which is used to provide an event value in the real time signal.

21. A method as in claim 17 together with the step of measuring movement of the trachea and providing an electrical output a real time signal.

22. A method as in claim 17 together with the step of measuring the heart rate of the patient and providing an electrical signal which is utilized in the real time signal.