Surgery – Diagnostic testing – Respiratory
Reexamination Certificate
2006-03-28
2006-03-28
Nasser, Robert L. (Department: 3736)
Surgery
Diagnostic testing
Respiratory
C073S023300, C042S084000
Reexamination Certificate
active
07018340
ABSTRACT:
Apparatus and methods for non-invasively determining the cardiac output or pulmonary capillary blood flow of a patient using partial re-breathing techniques. The apparatus includes a substantially instantaneously adjustable deadspace volume for accommodating differences in sizes or breathing capacities of various patients. The apparatus may be constructed of inexpensive elements, including one or more two-way valves, which render the apparatus very simple to use and inexpensive so that the unit may be employed as a disposable product. The method of the invention includes estimating the cardiac output or pulmonary capillary blood flow of a patient based on partial pressure of alveolar CO2, rather than on the partial pressure of end tidal CO2, as previously practiced. A computer program for calculating the cardiac output or pulmonary capillary blood flow of a patient is also disclosed.
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Jaffe Michael B.
Kofoed Scott A.
Orr Joseph A.
Westenskow Dwayne
Nasser Robert L.
NTC Technology Inc.
TraskBritt PC
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