Analysis of sleep apnea

• US 20030139680A1
• Filed: 01/22/2003
• Published: 07/24/2003
• Est. Priority Date: 01/22/2002
• Status: Active Grant

• Current Assignee: Natus Medical Incorporated
• Original Assignee: Medcare Flaga Hf
• Inventors: Sheldon, Stephen H.
• Granted Patent: US 6,936,011 B2
• Time in Patent Office: Days
• US Class Current: 600/529
• CPC Class Codes: A61B 5/08 Detecting, measuring or recording devices for evaluating the respiratory organs A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/4818 Sleep apnoea
• CPC Class Codes: A61B 5/6805 Vests

Abstract

A non-intrusive and quantitative method and apparatus for diagnosing sleep apnea and detecting apnea events by monitoring during sleep abdominal effort and thoracic effort, determining the phase of each effort, determining the difference in phase between each type of effort, and then determining the rate of phase angle change and standard deviation over time. Also provided may be treatment when apnea events are detected to trigger therapy apparatus such as airway positive pressure apparatus.

Claims

1. A method for diagnosing sleep apnea comprising the steps of measuring thoracic volume of a patient and determining the phase of the change of thoracic volume of said patient, measuring abdominal volume of said patient as a function of time and determining the phase of the change of abdominal volume of said patient, calculating the phase angles between said thoracic volume phase and said abdominal volume phase, and determining the standard deviation of the phase angle between the two respiratory signals for the diagnosis.

2. Apparatus for diagnosing sleep apnea comprising means for measuring abdominal effort in a patient, means for measuring thoracic effort in a patient, means for determining phase angle between two phase measurements, means for determining change in the phase angle, and determining standard deviation of the phase angle.

3. Apparatus according to claim 2 and comprising a wearable garment supporting the means for detecting abdominal effort and thoracic effort.

4. The apparatus of claim 3 in which the means for measuring thoracic and abdominal effort comprise piezo belts, PDF belts, inductance or impedance measurement devices and the like.

5. Apparatus for detecting apnea events comprising means for detecting abdominal effort and thoracic effort, means for measuring the detected abdominal effort, means for measuring the detected thoracic effort, means for gathering and storing data from said measured abdominal effort and said measured thoracic effort measurements, and means for transferring said data.

6. Apparatus according to claim 5 in which the gathered data includes measurements of the phase angles of the abdominal effort and thoracic effort, and further comprising means for determining the standard deviation between the phase angles.

7. Apparatus according to claim 13 and further comprising a wearable garment to which the detecting means are detachably affixed and positioned to measure the respective efforts when the garment is worn.