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, 2002
Filed:
Sep. 01, 2000
Applicant:
Inventors:
Lars Wallen, Spånga, SE;
Rolf Castor, Hägersten, SE;
Assignee:
Siemens Elema AB, Solna, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B 5/00 ;
U.S. Cl.
CPC ...
A61B 5/00 ;
Abstract
In a method for determining the gas content, e.g. of oxygen in breathing gas in a breathing apparatus, and a breathing apparatus operating according to the method, the gas content is determined from the speed of sound in the breathing gas. In order to resolve the problems caused by temperature variations in gas samples, determination of the speed of sound is synchronized with one or more specific times in a respiratory cycle. Determination can then be made when conditions are most stable.