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. 18, 2000
Filed:
Jul. 24, 1998
Eun Jong Cha, Hungduck-Ku, Cheongju-City, KR;
Other;
Abstract
Disclosed is a screen-type spirometer having an improved pneumotachometer, which has a simple structure and a low manufacturing cost and is convenient to use. According to the present invention, the pneumotachometer includes a hollow housing having an annularly shaped ring and a first respiratory tube integrally formed with the annularly shaped ring. The first respiratory tube can be inserted into a mouth of a person to be examined. The pneumotachometer also includes a second respiratory tube which can be engaged with the housing and be inserted into the mouth of the person. The first and the second respiratory tubes have a tapered portion, which is inclined at 10 degrees, respectively in order to stabilize a fluid flow of respiratory gases passing therethrough. O-shaped first and second sensing units for sensing a differential pressure of the respiratory gases passing through the pneumotachometer are disposed within the housing. A circularly shaped screen operating as a mechanical resistance against the respiratory gases is disposed between the first sensing unit and the second sensing unit within the housing. Prepherably, a suitable size for the screen has been found to be in the range of a screen having a mesh of 300 openings per inch. The pneumotachometer comprises a blowing apparatus for drying and cleaning the screen at need. The blowing apparatus is provided as an individual unit. A handle is attached to an outer surface of the annularly shaped ring.