Title:
DETECTION OF CENTRAL APNEAS
Document Type and Number:
WIPO Patent Application WO/2003/013355
Kind Code:
A1
Abstract:
The use of diagnostic processing of signals derived from a respiratory analysis mattress (2) to determine the occurence of central apneas is disclosed. A plurality of sensor strips (5) supply electrical signals arising from localised displacement by a patient's body. The individual body effort (displacement) signals are converted into digital form and provided to a processor (104). The occurence of a central apnea is determined by a relative dimunition of the digitised body effort signals. In one form, dimunition is determined by a reduction in amplitude in excess of a predetermined threshold amount. Alternatively, dimunition is determined by forming a ratio of a reference average movement effort value and a contemporaneous movement effort value, and comparing the ratio against a threshold reference value. Advantageously, a further condition can be that there is also a predominant cyclic signal within the range of respiratory origin present.
Inventors:
BRYDON JOHN WILLIAM ERNEST (AU)
Application Number:
PCT/AU2002/001028
Publication Date:
February 20, 2003
Filing Date:
August 02, 2002
Export Citation:
Assignee:
RESMED LTD (AU)
BRYDON JOHN WILLIAM ERNEST (AU)
BRYDON JOHN WILLIAM ERNEST (AU)
International Classes:
A61B5/113; (IPC1-7): A61B5/113
Domestic Patent References:
| WO1998052467A1 | 1998-11-26 | |||
| WO2001064103A1 | 2001-09-07 | |||
| WO2001012064A1 | 2001-02-22 |
Foreign References:
| US5062169A | 1991-11-05 | |||
| GB2319851A | 1998-06-03 | |||
| JPH0880286A | 1996-03-26 | |||
| JP2000000214A | 2000-01-07 |
Attorney, Agent or Firm:
SPRUSON & FERGUSON (NSW 2001, AU)
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