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:
Jul. 15, 1997
Filed:
Jun. 07, 1995
Karl Harnoncourt, Graz, AT;
NDD Medizintechnik GmbH, Wurzburg, DE;
Abstract
The invention relates to an ultrasonic spirometer with a graduated tube where a transmitter/receiver cell pair is positioned in a graduated portion diagonally or perpendicularly to the graduated tube axis, with an easily replaceable breathing tube being insertable into the graduated tube. The breathing tube is at least partially made from essentially one material which is permeable for ultrasonic waves, but wholly or at least largely impermeable to germs and contaminants. In accordance with the invention, the material permeable for the ultrasonic waves and wholly or at least largely impermeable to the germs and contaminants is positioned at least in the area in which the graduated portion intersects the graduated tube over the whole circumference of the breathing tube.