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:
Feb. 07, 1995
Filed:
Dec. 23, 1993
David Uhen, Burlington, WI (US);
Biochem International, Inc., Waukesha, WI (US);
Abstract
An apparatus periodically measures the carbon dioxide content of the breath of a medical patient. The need to recalibrate the apparatus is determined by comparing the carbon dioxide measurements taken at different times during the respiratory cycle to corresponding reference levels. These levels often occur when the apparatus no longer is measuring accurately. When recalibration is indicated the apparatus waits until the patient begins inhaling so that the recalibration does not interfere with measuring the carbon dioxide during exhalation. The apparatus then measures the carbon dioxide content of the ambient air to define an offset value used in patient monitoring.