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:
Dec. 03, 1996
Filed:
Jul. 06, 1995
Max H Weil, Northbrook, IL (US);
Wanchun Tang, Palm Desert, CA (US);
Jose Bisera, Camarillo, CA (US);
Institute of Critical Care Medicine, Palm Springs, CA (US);
Nihon Kohden Corporation, Tokyo, JP;
Abstract
A method is described for assessing perfusion failure of a patient by measurement pCO.sub.2 (partial pressure of carbon dioxide) in the digestive system of the patient. The method includes introducing a catheter (10, FIG. 1) through the nasal passage until a sensor (12) on the catheter lies in the esophagus, and taking measurements of CO.sub.2 in the esophagus. The measurements can be taken at the wall of the esophagus without inflating a balloon, by instead allowing the walls of the esophagus to contract about the catheter and the sensor thereof. The measurement involves minimal invasion while avoiding false readings such as those arising from CO.sub.2 produced in the stomach during digestion.