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:
Apr. 24, 2001
Filed:
May. 06, 1998
Michael Misner, San Diego, CA (US);
Howard E. Guthermann, Newton, MA (US);
Myron J. Block, Jupiter Island, FL (US);
Optix, LP, Jupiter Island, FL (US);
Abstract
The invention relates to the enhancement of the signal-to-background ratio of a non-invasive measurement of the concentration of a blood constituent at a measurement site by applying an external pressure at a location near the measurement site. In one embodiment, sufficient pressure is applied proximate to a measurement site to stop blood flow. The pressure is then suddenly relased, thereby generating a blood bolus passing through the site. By illuminating the measurement site before and during the passage of the blood bolus and observing the interaction of the input radiation with the measurement site, the concentration of a blood constituent can be measured. In another embodiment, the venous pulse is occluded by applying a pressure midway between systolic and diastolic pressure. By illuminating the measurement site in the absence of a venous pulse, the signal-to-background ration can be enhanced and the concentration of a blood constituent can be measured.