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. 02, 2016
Filed:
Dec. 09, 2008
Oleg Gonopolskiy, West Bloomfield, MI (US);
Arik Anderson, Birmingham, MI (US);
Bruce J. Barrett, Birmingham, MI (US);
Ronald A. Widman, Macomb, MI (US);
Oleg Gonopolskiy, West Bloomfield, MI (US);
Arik Anderson, Birmingham, MI (US);
Bruce J. Barrett, Birmingham, MI (US);
Ronald A. Widman, Macomb, MI (US);
Covidien LP, Mansfield, MA (US);
Abstract
A physiological sensor includes a light source and an age detector circuit in communication with the light source. The age detector circuit is configured to determine an age of the light source based on current-voltage characteristics of said light source. In addition, a method includes measuring an initial I-V characteristic and an actual I-V characteristic of the light source, and comparing the initial I-V characteristic to the actual I-V characteristic since changes in the I-V characteristics indicate aging. Actual I-V characteristics can be compared between light sources when they age at different rates to determine light source aging. Moreover, the method may include updating the memory device with the actual I-V characteristic at predetermined times.