The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2004
Filed:
May. 15, 2002
Mark A. Norris, Louisville, CO (US);
D. Alan Hanna, Boulder, CO (US);
Datex&thgr;Ohmeda, Inc., Madison, WI (US);
Abstract
A system and method of reducing cross talk in pulse oximetry signals that are attenuated by a patient tissue site are provided. In one embodiment, Red and IR LEDs of a pulse oximeter are separately excited ( ) and the respective Red and IR data vectors output by the detector are measured ( ). The Red and IR data vectors are normalized ( ). Red to IR and IR to Red cross talk vectors are computed ( ). Red and IR demodulation vectors are obtained by subtracting ( ) the respective Red and IR cross talk vectors from the respective normalized Red and IR data vectors. The demodulation vectors are normalized ( ), scaled ( ), and the magnitudes of the Red and IR signal components are obtained by computing ( ) the dot product of the composite signal data vector with the normalized and scaled Red demodulation and IR demodulation vectors, respectively.