Title:
METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING
Document Type and Number:
WIPO Patent Application WO2004010844
Kind Code:
A3
Abstract:
A method and apparatus for non-invasively determining the blood oxygen saturation level within a subject's tissue is provided that utilizes a near infrared spectrophotometric (NIBS) sensor capable of transmitting a light signal into the tissue of a subject and sensing the light signal once it has passed through the tissue via transmittance or reflectance. The method includes the steps of: (1) transmitting a light signal into the subject's tissue, wherein the transmitted light signal includes a first wavelength, a second wavelength, and a third wavelength; (2) sensing a first intensity and a second intensity of the light signal, along the first, second, and third wavelengths after the light signal travels through the subject at a first and second predetermined distance; (3) determining an attenuation of the light signal for each of the first, second, and third wavelengths using the sensed first intensity and sensed second intensity of the first, second, and third wavelengths; (4) determining a difference in attenuation of the light signal between the first wavelength and the second wavelength, and between the first wavelength and the third wavelength; and (5) determining the blood oxygen saturation level within the subject's tissue using the difference in attenuation between the first wavelength and the second wavelength, and the difference in attenuation between the first wavelength and the third wavelength.
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Inventors:
CHEN BO
BENNI PAUL B
BENNI PAUL B
Application Number:
PCT/US2003/022999
Publication Date:
June 10, 2004
Filing Date:
July 24, 2003
Export Citation:
Assignee:
CAS MEDICAL SYSTEMS INC (US)
International Classes:
G01N21/17; A61B5/00; A61B5/145; A61B5/1455; A61B5/1495; G01N21/35; A61B; (IPC1-7): A61B5/00
Foreign References:
| US4805623A | 1989-02-21 | |||
| US5729333A | 1998-03-17 | |||
| US6192260B1 | 2001-02-20 |
Other References:
See also references of EP 1545298A4
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