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. 29, 1999
Filed:
Apr. 22, 1998
Steven E Hobbs, Pleasanton, CA (US);
Ross Flewelling, Oakland, CA (US);
Nellcor Puritan Bennett, Pleasanton, CA (US);
Abstract
An improved method for optically measuring a characteristic of a patient's blood or tissue is provided which involves first passing an arterialization current (typically from about 1-10 mA AC or DC) through a relatively short tissue segment of a patient (up to about 12 inches) for a period of time sufficient to significantly increase blood flow, whereupon a transcutaneous optical measurement is made. The method is especially suited for pulse oximetry and permits more accurate readings owing to the increased amplitude of the detection signal. In another embodiment, a probe molecule composition may be initially applied to the patient's skin, and the arterialization current is used to rapidly and evenly diffuse the probe molecule into the tissue segment. An appropriate sensor can then be employed for detecting the probe molecule.