LUNG VOLUME MONITORING METHOD AND DEVICE
First Claim
1. In a system for determining functional residual capacity (FRC) of a patient, wherein the patient exhales into the system, thereby providing exhalation to the system and wherein the patient inhales from the system, thereby receiving inhalation from the system, a sensor which measures a fraction of at least one component of the inhalation and a second fraction of the at least one component of the exhalation, the method comprising the steps of:
- (a) providing a step change of oxygen fraction of the inhalation;
(b) subsequent to said step change, measuring the fraction of the at least one component in the inhalation and measuring the second fraction of the at least one component in the exhalation; and
(c) calculating the functional residual capacity of the lungs of the patient based on the first fraction and the second fraction.
0 Assignments
0 Petitions
Accused Products
Abstract
A method for determining functional residual capacity (FRC) of a patient while ventilating the patient. The system may include a medical ventilator which provides inhalation and exhalation from the patient, a sensor which measures a fraction one or more gas components of the inhalation and a fraction of the same gas components of the exhalation. A step change of oxygen fraction is provided to the inhalation of the patient. Subsequent to the step change, The fractions of the gas components are measured in the inhalation and in the exhalation. The functional residual capacity of the lungs of the patient is measured based on the fraction of the gas components in the inhalation and in the exhalation. The step change is provided manually by a technician, or automatically by programming a programmable device to provide the step change automatically to the patient by the medical ventilator. The step change is either an increase or a decrease in of the oxygen fraction.
59 Citations
30 Claims
-
1. In a system for determining functional residual capacity (FRC) of a patient, wherein the patient exhales into the system, thereby providing exhalation to the system and wherein the patient inhales from the system, thereby receiving inhalation from the system, a sensor which measures a fraction of at least one component of the inhalation and a second fraction of the at least one component of the exhalation, the method comprising the steps of:
-
(a) providing a step change of oxygen fraction of the inhalation; (b) subsequent to said step change, measuring the fraction of the at least one component in the inhalation and measuring the second fraction of the at least one component in the exhalation; and (c) calculating the functional residual capacity of the lungs of the patient based on the first fraction and the second fraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A system for determining functional residual capacity (FRC) of a patient, the system comprising:
-
(a) a medical device which provides inhalation to the patient. (b) a sensor which measures a fraction of at least one component of the inhalation and a second fraction of said at least one component of the exhalation; wherein a step change of oxygen fraction of the inhalation is provided to the patient and subsequent to said step change, the fraction of the at least one component in the inhalation is measured and the second fraction of the at least one component in the exhalation is measured; and wherein the functional residual capacity of the lungs of the patient is calculated based on the first fraction and the second fraction. - View Dependent Claims (27, 28, 29, 30)
-
Specification