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:
Oct. 31, 2000
Filed:
Jan. 29, 1999
Erkki Heinonen, Helsinki, FI;
Instrumentarium Oy, Helsinki, FI;
Abstract
A method for determining pulmonary functional residual capacity (FRC). A given amount of indicator gas is delivered into the breathing gases flowing into the lungs of a subject in a selected number of sequential breaths. The amounts of indicator gas delivered during the selected number of breaths are summed to provide a cumulative total (.SIGMA.V.sub.in). The amount of indicator gas exhaled in the number of sequential breaths is summed to provide a cumulative total (.SIGMA.V.sub.out). An indication of the concentration of indicator gas in the lungs of the subject (F.sub.ET) is obtained for said two or more breaths. Using the quantities (.SIGMA.V.sub.in), (.SIGMA.V.sub.out), and (F.sub.ET) as measured variables, at least two measured value data sets are formed in which the product of the indicator gas concentration (F.sub.ET) and a regression coefficient comprising the functional residual capacity (FRC) plus the product of the cumulative total of exhaled indicator gas (.SIGMA.V.sub.out) and a regression coefficient K equals the cumulative total of the delivered indicator gas (.SIGMA.V.sub.in). Multi dimensional regression analysis is carried out using the data sets to obtain values for K and FRC fitted to said data sets. The value FRC so obtained is a determination of function residual capacity.