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:
Sep. 17, 1991
Filed:
Mar. 03, 1989
Wilber H Bailey, Leucadia, CA (US);
Camino Laboratories, Inc., San Diego, CA (US);
Abstract
A method and apparatus for measuring the oxygen saturation level and hematocrit of human blood in real time. A catheter having a notch in its tip is inserted into a blood vessel and guided to a desired location in the body of a patient. Bursts of light at each of three wavelengths are transmitted through the blood in the notch. The intensities of the bursts of light after transmission are utilized along with a set of molecular exinction coefficients and optical scattering coefficients to calculate the oxygen level and hermatocrit. The light is provided by a set of LEDs in a housing connected to the catheter and the intensity of the transmitted light is measured by a photocell in the same housing. Optical fibers transmit the light through the catheter between the housing and the notch. Characterization resistors in the housing are encoded with characteristics such as the wavelengths of the LEDs and the width of the notch. In an alternate embodiment blood circulating through a loop out of the patient's body is passed through a chamber and is exposed to the light.