Surgery – Diagnostic testing – Measuring or detecting nonradioactive constituent of body...
Patent
1997-02-14
1998-12-01
Bahr, Jennifer
Surgery
Diagnostic testing
Measuring or detecting nonradioactive constituent of body...
A61B 500
Patent
active
058429794
ABSTRACT:
An improved method and apparatus for the photoplethysmographic monitoring of blood analyte parameters, specifically oxyhemoglobin, deoxyhemoglobin (reduced hemoglobin), carboxyhemoglobin and methemoglobin, uses a plurality of beams of light having different spectral contents to trans-illuminate the tissue of a patient. Received light is measured and the normalized differential absorption is used in a forward calibration equation to generate estimated relative blood analyte concentration values. Error in the blood analyte concentration values is minimized by applying constraints to the estimated analytes. Specifically, the constraints require that all relative analyte concentration values are greater than or equal to zero and sum to one hundred percent. An alternate method of applying constraints to the determination of the stabilized analyte concentration values reduces computation time by using an inverse calibration equation and substituting the inverse equation for the forward equation in the minimization process.
REFERENCES:
patent: 4167331 (1979-09-01), Nielsen
patent: 5553615 (1996-09-01), Carim et al.
patent: 5638816 (1997-06-01), Kiani-Azarbayjany et al.
Bahr Jennifer
Ohmeda Inc.
Rathbun Roger M.
Winakur Eric F.
LandOfFree
Method and apparatus for improved photoplethysmographic monitori does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for improved photoplethysmographic monitori, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for improved photoplethysmographic monitori will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2391485