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:
Jun. 18, 2002
Filed:
Aug. 03, 2000
D. Alan Hanna, Boulder, CO (US);
Jonas A. Pologe, Boulder, CO (US);
Datex-Ohmeda, Inc., Madison, WI (US);
Abstract
A system is provided for improving photoplethysmographic analyte measurements by de-emphasizing motion-contaminated data and/or emphasizing motion-free data. The system is used in a measurement instrument which includes at least illumination source for transmitting at least two light signals at two center wavelengths through a patient's appendage and a sensor for converting the light signals transmitted through the appendage into electrical output signals. The system includes a first buffer configured to temporarily store at least one pulse cycle of output signals received from the sensor A motion estimator quantifies an amount of motion associated with the output signals stored in the first buffer by performing a principal component analysis on differential absorption values derived from the output signals. Based on the amount of motion estimated, a weight application module is configured to associate a weight with the output signals in the first buffer. The weighted output signals are transferred into a second buffer which contains weighted output signals collected over multiple pulse cycles. An analyte computing module computes blood analyte related values based on the weighted output signals stored in the second buffer