System for measurement of oxygen uptake and respiratory quotient
First Claim
1. Apparatus for use in a system for measuring oxygen uptake and the like comprising first conduit means for conducting flow of respiration gases to and from a patient, said first conduit means including first flow resistance means, second conduit means having one end thereof in communication with said first conduit means on one side of said first flow resistance means and the other end thereof in communication with said first conduit means on the other side of said first flow resistance means, said second conduit means including second flow resistance means, the volume of said second conduit means being substantially greater than the volume of gases conducted therethrough by a single breath of the patient whereby flushing of the second conduit means is precluded, and sampling means coupled adjacent the ends of said second conduit means for analyzing the gases therein.
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Accused Products
Abstract
A system for measuring the oxygen uptake and respiratory quotient of a patient which employs a high resistance gas flow path in parallel with a pneumotachograph. The high resistance path is connected to each side of the pneumotachograph and a small chamber is included in the high resistance path at each end thereof adjacent its connection to the pneumotachograph. The volume of the high resistance path, together with its resistance relative to that of the pneumotachograph is chosen such that, during respiration of the patient employing the device, the high resistance path will never be completely flushed through in one direction before flow starts in the opposite direction. The high reistance path is chosen to be a constant resistance such that the amount of flow therethrough is proportional to the flow through the pneumotachograph. Thus by sampling and analyzing a small portion of the gas of the two chambers and measuring the amount of gas flow by the pneumotachograph, the exact amount of oxygen uptake can be calculated.
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Citations
11 Claims
- 1. Apparatus for use in a system for measuring oxygen uptake and the like comprising first conduit means for conducting flow of respiration gases to and from a patient, said first conduit means including first flow resistance means, second conduit means having one end thereof in communication with said first conduit means on one side of said first flow resistance means and the other end thereof in communication with said first conduit means on the other side of said first flow resistance means, said second conduit means including second flow resistance means, the volume of said second conduit means being substantially greater than the volume of gases conducted therethrough by a single breath of the patient whereby flushing of the second conduit means is precluded, and sampling means coupled adjacent the ends of said second conduit means for analyzing the gases therein.
Specification